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Dinamarco, Nelson, Grazia Maria Guerra, Frida Liane Plavnik, Luis Cuadrado Martin, and Luiz Aparecido Bortolotto. "MELHORANDO O CONTROLE DA PRESSÃO ARTERIAL COM A ADOÇÃO DA AUTOMEDIÇÃO DA PRESSÃO ARTERIAL– AMPA." Revista Brasileira de Hipertensão 29, no. 2 (June 1, 2022): 34–36. http://dx.doi.org/10.47870/1519-7522/2022290234-6.
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Blood Pressure Self-Measurement (BPSM) has gained interest lately and its practice can contribute to the diagnosis and follow-up of arterial hypertension. In Brazil, due to difficulties in carrying out Home Blood Pressure Monitoring (HBPM) and the unavailability of Ambulatory Blood Pressure Monitoring (ABPM) in most facilities, AMPA, which differs from the aforementioned methods, has widespread use in our country. Therefore, it seems important to discuss this method, which is largely used and poorly studied. In this paper, we will describe the methods for measuring blood pressure, auscultatory and oscillometric, in addition to listing the advantages and disadvantages of measuring blood pressure in the office, comparing them with AMPA. We will also make an alert about the need for the patient to receive guidance on blood pressure measurement and, finally, we will cite the Brazilian and European Guidelines regarding the mention they make about this method.
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Shashi, Bhushan Kumar, and Krishna Prasad Bijay. "A Comparative Assessment of Various Hemodynamic Parameters between Urban and Rural Population: An Analytical Study." International Journal of Current Pharmaceutical Review and Research 15, no. 12 (December 30, 2023): 107–11. https://doi.org/10.5281/zenodo.11371590.
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Aim: The aim of the present study was to assess systolic blood pressure, diastolic blood pressure, mean arterialpressure. pulse pressure, chronic kidney disease.Methods: The present study was conducted in the Department of Physiology for nine months and involved 100subjects both from urban and rural areas. The subjects were selected in the age group of 20 to 60 years this wasdoneResults: The systolic blood pressure of both rural and urban population was compared using F test and a p valueof 0.48 was obtained. The diastolic blood pressure of both rural and urban population was compared andanalyzed by using F test and we got a p value of 0.0028. The pulse pressure of both rural and urban populationwas compared by F test which shows a p value of 0.039. The mean arterial pressure of both rural and urbanpopulation was compared by using F test where we got a p value of 0.0007.Conclusion: Obese and overweight population is significantly more in the urban area compared to the ruralarea. The urban population have a significantly higher S.B.P., D.B.P, M.A.P and P.P than the rural population.There is increased incidence of hypertension in the urban males and females compared to rural males andfemales. This clearly indicates that the urban populations are at increased risk of cardiovascular disease.Keywords: Systolic blood pressures, diastolic blood pressure, mean arterial pressure, pulse pressure, chronickidney disease
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Ruth, P. J. van, R. R. Hillis, and R. E. Swarbrick. "DETECTING OVERPRESSURE USING POROSITY-BASED TECHNIQUES IN THE CARNARVON BASIN, AUSTRALIA." APPEA Journal 42, no. 1 (2002): 559. http://dx.doi.org/10.1071/aj01032.
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Overpressure has been encountered in many wells drilled in the Carnarvon Basin. Sonic logs are used to estimate pore pressure in shales in the Carnarvon Basin using the Eaton and equivalent depth methods of estimating pore pressure from velocity data with reference to a normal compaction trend. The crux of pore pressure estimation from the sonic log lies in the determination of the normal compaction trend, i.e. the acoustic travel time (Δt)/depth (z) trend for normally pressured sediments. The normal compaction trend for shales in the Carnarvon Basin was established by fitting an Athy-type exponential relationship to edited sonic log data, and is: Δt = 225 + 391exp(-0.00103z) Vertical stress estimates are also needed for the Eaton and equivalent depth methods used herein. A vertical stress (σv) relationship was obtained by fitting a regression line to vertical stress estimates from the density log, and is: σv = 0.0131 z1.0642 The Eaton and equivalent depth methods yield similar pressure estimates. However, the equivalent depth method can only be applied over a limited range of acoustic travel times, a limitation that does not apply to the Eaton method. The pressure estimates from the Eaton method were compared to pressures measured by direct pressure tests in adjacent permeable units. There is a good correlation between Eaton and test pressures in normally pressured intervals in three wells and overpressured intervals in two wells. Eaton pressure estimates underestimate overpressured direct pressure measurements in four wells by up to 13 MPa. This is consistent with overpressure being generated (at least in part) by a fluid expansion mechanism or lateral transfer of overpressure. The Eaton pressures in one well are, on average, 11 MPa lower than hydrostatic pore pressure recorded in direct pressure measurements below the Muderong Shale. The sediments in this well appear to be overcompacted due to exhumation. Mud weights can be used as a proxy for pore pressure in shales where direct pressure measurements are not available in the adjacent sandstones. The Eaton pressure estimates are consistent with mud weight in the Gearle Siltstone and Muderong Shale in 4 of the 8 wells studied. The Eaton pressures are on average 10 Mpa in excess of mud weight in the Muderong Shale and Gearle Siltstone in three wells. It is unclear whether the predicted Eaton pressures in these three wells accurately reflect pore pressure (i.e. the mud weights do not accurately reflect pore pressure), or whether they are influenced by changes in shale mineralogy (because the gamma ray filter does not differentiate between shale mineralogy).
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John, Ajesh, Ashutosh Kumar, Karthikeyan G., and Pankaj Gupta. "An integrated pore-pressure model and its application to hydrocarbon exploration: A case study from the Mahanadi Basin, east coast of India." Interpretation 2, no. 1 (February 1, 2014): SB17—SB26. http://dx.doi.org/10.1190/int-2013-0078.1.
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An integrated pore-pressure modeling approach was adopted to understand the basin architecture from a pressure perspective and its inference toward possible hydrocarbon occurrence. Kriging-based 3D pore-pressure modeling was used with offset well data and seismic velocities to establish the pressure stratigraphy of the northeast coast (NEC) field (southern part) in the Mahanadi Basin. Late Pliocene sediment is moderately pressured ([Formula: see text]), whereas early Pliocene sediment is normally pressured ([Formula: see text]) and compacted, representing a regional seal for this part of the basin. Miocene represents the onset window for major undercompaction and associated high pressures ([Formula: see text]) in conformance with the regional pressure trend. Overpressure distribution and its mechanisms in the late Miocene level across the NEC field shows distinct patterns with highly elevated pressures ([Formula: see text]) in the northern part resulting from a hybrid unloading mechanism, whereas moderate to high pressure ([Formula: see text]) toward the southern part is associated with undercompaction. Regional pressure correlation across the study area suggests a pressure dependent habitat of hydrocarbons in the Miocene and late Pliocene levels. Pressure distribution and an excess pressure pattern within the Miocene stratigraphy shows a regression trend from north to south, possibly indicating a preferred subsurface fluid flow direction, which is supported by high-quality gas reservoirs discovered in the southern part of the study area. A similar but reverse pressure regression trend is observed within the late Pliocene stratigraphy, which is also validated by the presence of gas reservoirs in the northern part of the study area. Major hydrocarbon reservoirs in the Miocene and Pliocene stratigraphy from the southern part of study area exhibit a strong correlation with effective stress distribution. High-quality gas reservoirs are mostly associated with high effective stress ([Formula: see text]), whereas a high probability for reservoirs to be water wet are observed below this threshold value.
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DS, Dr Rajeev. "Peripheral Venous Pressure: An Alternative to Central Venous Pressure?" Journal of Medical Science And clinical Research 05, no. 04 (April 27, 2017): 20685–91. http://dx.doi.org/10.18535/jmscr/v5i4.154.
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Wheeler, Abigail, Shanti Farrington, Fay Sweeting, Amy Brown, and Andrew Mayers. "Perceived Pressures and Mental Health of Breastfeeding Mothers: A Qualitative Descriptive Study." Healthcare 12, no. 17 (September 8, 2024): 1794. http://dx.doi.org/10.3390/healthcare12171794.
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When a mother is supported to breastfeed, the benefits for her mental health are significant. However, if pressured or unsupported, the opposite is true. This research examines mothers’ breastfeeding experiences, exploring how perceived pressure can impact perinatal mental health. A sample of 501 respondents to a research questionnaire was explored using Reflexive Thematic Analysis. Three main themes identified were perceived pressure to breastfeed, perceived pressure not to breastfeed and mental health impact. The main findings were that mothers received conflicting advice from healthcare professionals, and pressures to feed in a certain way came from their support networks, as well as from their internal beliefs. Perceived pressures negatively impacted maternal mental health, while positive breastfeeding experiences benefitted mental health outcomes.
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Varan, Nilufer Yildiz. "Wireless pressure sensors for pressure garments treated with chitosan." International Journal of Clothing Science and Technology 29, no. 5 (September 4, 2017): 732–42. http://dx.doi.org/10.1108/ijcst-12-2016-0136.
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Purpose The purpose of this paper is to analyze the effects of chitosan treatments on exerted pressures of nylon 6.6/elastane pressure garments in three different knit structures using wireless pressure sensors for an accurate and a precise scar management for future designs. Design/methodology/approach Pressure garments designed in different structures consist of 70/30 and 75/25 nylon 6.6/elastane were treated with chitosan and the exerted pressures were analyzed using wireless pressure sensors including ultra-thin and flexible printed circuit sensors in comparison with untreated control samples. Antimicrobial activities and washing tests were also evaluated. Findings It is found that chitosan treatments have a significant effect on final pressures. Exerted pressures increased significantly for all samples after chitosan treatments. Higher pressures were measured for weft knit structured designs while lower pressures were recorded for powernet structured garments. It is found that the elasticity showed a small significant decrease and it has attributed due to a small significant shrinkage during processes. The mean scores of pressures were found in the acceptable medical range which will continue to help hypertrophic scar management for future designs. The exerted pressures of the fabrics remained constant after five washes and showed a small significant decrease after 10 and 50 washes which will provide a long period of compression. Permanent antimicrobial effectiveness has gained at around 90 percent after five washes and 50 percent after 50 washes. A small significant increase was observed for stiffness (CD, MD) after ten washes. Originality/value Chitosan treatments impact exerted pressures of pressure garments significantly. It is a reference to evaluate pressure functions of pressure garments using wireless pressure sensors while imparting antimicrobial activity.
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Sellamuthu, Hariraj. "Is the Work Pressure Accelerating Blood Pressure? A Cross-Sectional Study in a Pressure Cooker Manufacturing Industry." Journal of Advanced Research in Medicine 10, no. 04 (December 30, 2023): 14–17. http://dx.doi.org/10.24321/2349.7181.202310.
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Sergey, Ivakhnenko, Lysakovskyi Valentyn, Savitsky Oleksandr та Burchenia Andrii. "Determining high quasihydrostatic pressure up to 7 GPa at a temperature to 1,400 °С using resistive sensors". Eastern-European Journal of Enterprise Technologies 3, № 5(99) (30 червня 2019): 13–20. https://doi.org/10.15587/1729-4061.2019.168712.
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A differential method for measuring high quasi‒hydrostatic pressures for six‒punch pressing installations has been constructed by building a load-carrying characteristic р=f(Q), where p is the value for pressure in a quasi‒hydrostatic cell of high‒pressure, Q is the force of the press. Pressure in the cell is measured by using the measurement of a temperature difference between the polymorphic transformations into Co(α→β) and Fe(α→γ), melting of Cu and Ag; the measurements are performed by resistometry. The initial data used were the lines of polymorphic transitions in iron (BCC‒FCC) and cobalt (FCC‒HCP) within the ranges p=4‒7 GPa and T=500‒700 °C, examined in detail earlier in the p, T‒diagrams, as well as copper and silver melting curves at p=4‒7 and T=1,150‒1,400 °C. The database of initial data is represented in the analytical form, which has made it possible to use them to determine pressure in the cell at high temperatures based on the values for magnitudes of the differential temperature difference ΔT<sub>d</sub>, which was measured experimentally for the Co<sup>α‒β</sup>–Fe<sup>α‒γ</sup>and Ag<sup>L.</sup>–Cu<sup>L. </sup>sensors, designed in the current paper; we have described the features in assembling differential sensors and their electrical connections in order to perform the process of measuring the magnitudes for ΔT<sub>d</sub>. We have designed structures for the high-pressure cells to conduct experiments on measuring ΔT<sub>d</sub> using thermocouples and a circuit that registers a change in the resistance of sensors at phase transformations. The procedure applied has made it possible to determine pressure in the quasi-hydrostatic cells of six-punch setups by building load characteristics. The main benefits of the devised method for measuring quasi‒hydrostatic pressures by resistometry are its relative simplicity and a significant increase in the accuracy of pressure determination. The latter is achieved through the mutual elimination of corrections of pressure impact and parasitic components for the magnitude of thermo‒EMF of thermocouples in determining the values for a temperature of phase transformations in the resistive sensors Co‒Fe and Ag‒Cu. The data obtained could be used for monitoring and measuring pressures in the cells of six-punch pressing installations with a plunger diameter of 560‒950 mm.
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M.B, Pushpa, and Varsha Vijay AKhade A.V. "Study of Intraocular Pressure (IOP) Changes in Relation Blood Pressure." International Physiology 5, no. 2 (2017): 107–9. http://dx.doi.org/10.21088/ip.2347.1506.5217.12.
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Chunyu, T., P. Xiujun, N. Li, L. Qin, and Z. Tian. "The Correlation between Intracranial Pressure and Intraocular Pressure after Brain Surgery." International Journal of Ophthalmology & Eye Science 2, no. 5 (August 22, 2014): 54–58. https://doi.org/10.19070/2332- 290X-140008.
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Objective: This study was to explore whether the intracranial pressure (ICP) changes and intraocular pressure (IOP) changes are synchronized after brain surgery. We also want to see whether measurement of IOP could be used to monitor ICP. Materials and methods: We evaluated the correlation between intracranial pressure and intraocular pressure in 15 patients with meningioma admitted to our hospital. All patients required the intracranial pressure monitoring on clinical grounds. Intraocular pressures were measured by portable non-contact tonometer. We simultaneous recorded the intracranial pressure and intraocular pressure once a time per hour. Results: We found significant correlation between intraocular pressures and intracranial pressure in 60.0% (9/15) of the tested population. However, ICP and IOP showed significant correlation only in 4 (16.7%) out of 24 time points (P<0.05). Conclusions: Although there is a significant correlation between ICP and IOP in neurosurgical patients, changes in IOP cannot always reflect the dynamic changes in ICP.
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Pickering, L. A., and G. J. lndelicato. "Abnormal Formation Pressure: A Review." Mountain Geologist 22, no. 2 (April 1, 1985): 78–89. http://dx.doi.org/10.31582/rmag.mg.22.2.78.
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Abnormal formation pressure is defined as any pressure that deviates from the normal hydrostatic gradient. In order for these pressures to form and be preserved, a near-seal is required. The seal is not necessarily impermeable but may be a low permeability formation, such as shale, or a fault-related barrier. The possible causes of abnormal formation pressure are: 1) compaction of sediments, 2) tectonic activities, 3) temperature changes, 4) osmosis, 5) diagenesis, 6) methane generation, and 7) buoyancy. Temperature changes due to decay, diagenesis, and changes in burial depth of the formation are one of the two most important causes of abnormal formation pressure. The other important cause is compaction pressure related to the weight of overburden with increased depth of burial. If the pore fluids cannot escape, they will support a greater proportion of the total overburden stress and become abnormally highly pressured. Tectonic activities such as faulting as well as removal of overburden by erosion also play an important role in either raising or lowering pore fluid pressure. Osmosis, diagenesis, methane generation, and buoyancy are all additive to the overall effects of pressure and temperature.
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Rajkumar, R. Vinodh. "DIASTOLIC BLOOD PRESSURE OR ACTUALLY IT IS BASELINE SYSTOLIC BLOOD PRESSURE?" International Journal of Physiotherapy and Research 3, no. 4 (August 11, 2015): 1126–32. http://dx.doi.org/10.16965/ijpr.2015.155.
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Fike, C. D., and S. J. Lai-Fook. "Effect of airway and left atrial pressures on microcirculation of newborn lungs." Journal of Applied Physiology 69, no. 3 (September 1, 1990): 1063–72. http://dx.doi.org/10.1152/jappl.1990.69.3.1063.
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To determine the effect of lung inflation and left atrial pressure on the hydrostatic pressure gradient for fluid flux across 20- to 60-microns-diam venules, we isolated and perfused the lungs from newborn rabbits, 7-14 days old. We used the micropuncture technique to measure venular pressures in some lungs and perivenular interstitial pressures in other lungs. For all lungs, we first measured venular or interstitial pressures at a constant airway pressure of 5 or 15 cmH2O with left atrial pressure greater than airway pressure (zone 3). For most lungs, we continued to measure venular or interstitial pressures as we lowered left atrial pressure below airway pressure (zone 2). Next, we inflated some lungs to whichever airway pressure had not been previously used, either 5 or 15 cmH2O, and repeated venular or interstitial pressures under one or both zonal conditions. We found that at constant blood flow a reduction of left atrial pressure below airway pressure always resulted in a reduction in venular pressure at both 5 and 15 cmH2O airway pressures. This suggests that the site of flow limitation in zone 2 was located upstream of venules. When left atrial pressure was constant relative to airway pressure, the transvascular gradient (venular-interstitial pressures) was greater at 15 cmH2O airway pressure than at 5 cmH2O airway pressure. These findings suggest that in newborn lungs edema formation would increase at high airway pressures only if left atrial pressure is elevated above airway pressure to maintain zone 3 conditions.
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Sreenidi, Rangadhamaiah. "Comparison of Conventional Central Venous Pressure with Peripheral Venous Pressure and External Jugular Venous Pressure in Patients with Sepsis." Indian Journal of Anesthesia and Analgesia 7, no. 4 (July 1, 2020): 979–85. http://dx.doi.org/10.21088/ijaa.2349.8471.7420.19.
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Mahler, C., P. Kloosterziel, J. Eshuis, G. Weverling, W. Bemelman, and M. Boermeester. "CORRELATION BETWEEN BLADDER PRESSURE AND INTRA-ABDOMINAL PRESSURE IN RELATION TO RESPIRATORY PRESSURES." Shock 21, Supplement (March 2004): 110. http://dx.doi.org/10.1097/00024382-200403001-00437.
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Sanders, J. S., and D. W. Ferguson. "Diastolic pressure determines autonomic responses to pressure perturbation in humans." Journal of Applied Physiology 66, no. 2 (February 1, 1989): 800–807. http://dx.doi.org/10.1152/jappl.1989.66.2.800.
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Arterial baroreceptors reflexly regulate sympathetic and heart rate responses to alteration of blood pressure. The primary mechanical determinant of arterial baroreceptor activity in humans remains unclear. We examined the influence of systolic, diastolic, pulse, and mean arterial pressures on efferent muscle sympathetic nerve activity (MSNA, microneurography) and heart rate responses during perturbation of arterial pressure in 10 normal human subjects [age 25 +/- 2 (SE) yr]. We directly measured arterial pressure, heart rate, and MSNA during intravenous vasodilator infusion (nitroprusside, 6 +/- 1 micrograms.kg-1.min-1, n = 6; or hydralazine, 16 +/- 2 mg, n = 4) while central venous pressure was held constant by simultaneous volume expansion. Changes in arterial pressures were compared with changes in heart rate and MSNA over 3-min periods of vasodilator infusion during which we observed increases in systolic and pulse pressures with simultaneous decreases in mean and diastolic pressures. During vasodilator infusion, there were increases in systolic (124.2 +/- 2.1 to 131.7 +/- 2.9 Torr, P less than 0.001) and pulse pressures (57.0 +/- 2.2 to 72.7 +/- 2.7 Torr, P less than 0.001) although mean arterial pressure fell (88.0 +/- 2.6 to 80.4 +/- 2.7 Torr, P less than 0.001) because of decreases in diastolic pressure (67.2 +/- 3.0 to 59.0 +/- 2.7 Torr, P less than 0.001). The changes in arterial pressures were accompanied by simultaneous increases in heart rate (66.4 +/- 3.0 to 92.6 +/- 4.8 beats/min, P less than 0.001) and MSNA (327 +/- 59 to 936 +/- 171 U, P less than 0.005).(ABSTRACT TRUNCATED AT 250 WORDS)
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Godbey, P. S., J. A. Graham, R. G. Presson, W. W. Wagner, and T. C. Lloyd. "Effect of capillary pressure and lung distension on capillary recruitment." Journal of Applied Physiology 79, no. 4 (October 1, 1995): 1142–47. http://dx.doi.org/10.1152/jappl.1995.79.4.1142.
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To investigate the effect of capillary pressure and alveolar distension on capillary recruitment, we used video-microscopy to quantify capillary recruitment in individual subpleural alveolar walls. Canine lobes were perfused with autologous blood either while inflated by positive airway pressure or while inflated by negative intrapleural pressure in the intact thorax with airway pressure remaining atmospheric. Low flow rates minimized the arteriovenous pressure gradient (< 5 mmHg), permitting capillary pressure estimation by averaging these pressures. Capillary pressure was varied stepwise from airway pressure to 30 mmHg above airway pressure. Capillary recruitment always began as capillary pressure exceeded airway pressure. At low positive airway pressures, the capillaries of the excised lobes opened suddenly over a narrow pressure range. AT higher airway pressures and in the intact thorax, recruitment occurred over a wide range of capillary pressures. We conclude that capillary perfusion begins when intracapillary pressure just exceeds alveolar pressure but that further increases in capillary pressure recruit capillaries depending on tension in the alveolar wall, whether imposed by positive airway pressure or by gravity when the lung is suspended in an intact thorax.
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John, Ajesh. "Pore-pressure prediction challenges in chemical compaction regimes: An alternative VP/VS-based approach." Interpretation 4, no. 4 (November 1, 2016): T443—T454. http://dx.doi.org/10.1190/int-2015-0106.1.
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Understanding pressure mechanisms and their role in porosity-effective stress relationship is crucial in pore-pressure prediction estimation, particularly in complex geologic and high-temperature regimes. Overpressures are commonly associated with undercompaction and/or unloading mechanisms; those associated with undercompaction generally possess a direct relationship between effective stress and porosity, whereas those associated with unloading do not provide such direct indications from porosity trends. The type of associated unloading mechanism can be correlated when the effective stress and velocity become distorted with the onset of unloading. In the Ravva field, the pore-pressure distribution and overpressure mechanism in the Miocene and below it is a classic example of the unloading mechanism related to chemical compaction, thereby making it difficult to resolve the magnitude and trend of pore pressures. Here, the ratio of P- and S-wave velocities ([Formula: see text]) is analyzed from the drilled locations to understand the effects of lithology, pressure, and fluids on formation velocities and indicates a distinct decreasing trend across the overpressure formations, which I have corresponded to excess pressure resulting from chemical compaction. Across the high-pressured zones, [Formula: see text] ratios show low values compared with normally pressured zones possibly due to the presence of hydrocarbon and/or overpressures. A velocity correction coefficient ranging 0.83–0.71 is resolved for overpressure zones by normalizing the [Formula: see text] values across the normally pressured formations, and thereby assuring that a pore-pressure estimation using corrected velocity from [Formula: see text] analysis shows a high degree of accuracy on prediction trends. Pore-pressure predictions based on [Formula: see text] are a more effective and valid approach in high-temperature settings, in which numerous factors can contribute to pressure generation and a direct effective stress-porosity relationship deviates from the trend.
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Fike, C. D., S. J. Lai-Fook, and R. D. Bland. "Alveolar liquid pressures in newborn and adult rabbit lungs." Journal of Applied Physiology 64, no. 4 (April 1, 1988): 1629–35. http://dx.doi.org/10.1152/jappl.1988.64.4.1629.
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To study the effects of lung maturation and inflation on alveolar liquid pressures, we isolated lungs from adult and newborn rabbit pups (1-11 days old). We used the micropuncture technique to measure alveolar liquid pressure at several transpulmonary pressures on lung deflation. Alveolar liquid pressure was greater than pleural pressure but less than airway pressure at all transpulmonary pressures. Alveolar liquid pressure decreased further below airway pressure with lung inflation. At high transpulmonary pressure, alveolar liquid pressure was less in newborn than in adult lungs. To study the effects of edema, we measured alveolar liquid pressures in newborn lungs with different wet-to-dry weight ratios. Alveolar liquid pressure increased with progressive edema. In addition, we compared alveolar liquid and perivenular interstitial pressures in perfused newborn lungs and found that they were similar. Thus alveolar liquid pressure can be used to estimate perivenular interstitial pressure. We conclude that the transvascular pressure gradient for fluid flux into the interstitium might increase with lung inflation and decrease with progressive edema. Furthermore, this gradient might be greater in newborn than adult lungs at high inflation pressures.
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Rufus, Rajkumar Peterson, and Sandeep G. "Cold Pressor Test as A Predictor of Hypertension in Normotensive Medical Students." International Journal of Pharmaceutical and Clinical Research 15, no. 7 (July 30, 2023): 787–89. https://doi.org/10.5281/zenodo.11660087.
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<strong>Introduction:</strong> Early diagnosis of hypertension risk may enable an individual to live a healthier lifestyle. Subjects with hypertension predisposing variables have a higher and longer reaction to blood pressure after stress. The current study was carried out to assess cardiovascular response, such as blood pressure and heart rate changes during a cold presser test, as a prospective future risk factor for hypertension in normotensive Medical students. <strong>Materials and Methods:</strong> Normotensive, non-smoking healthy 60 first MBBS students of either sex of Mamata Medical College of age group 18-22 years participated in the study. This study was conducted between February 2023 and March 2023. The cold pressor test was carried out. The changes in blood pressure and heart rate among the students of hyper responsive group and normo responsive group were compared using Student’s t-test. <strong>Result:</strong> In the present study, 30% of total subjects were hyper reactors. Average SBP in the hyper response group during CPT and recovery were 132.56 mm Hg & 128.75 mm Hg. Average DBP in the hyper response group during CPT and recovery were 84.28 mm Hg & 79.42 mm Hg which was statistically significant. <strong>Conclusion:</strong> The current study demonstrates that hyperresponsiveness may precede essential hypertension and that the cold pressor test may be effective as a predictor of future hypertension in a young study population. Early intervention in their lifestyle change can help them avoid acquiring hypertension later in life.
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Salem, M. Ramez, Keith W. Bruninga, Jyothi Dodlapatii, and Ninos J. Joseph. "Metoclopramide Does Not Attenuate Cricoid Pressure–induced Relaxation of the Lower Esophageal Sphincter in Awake Volunteers." Anesthesiology 109, no. 5 (November 1, 2008): 806–10. http://dx.doi.org/10.1097/aln.0b013e31818a37dc.
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Background The authors examined the influence of metoclopramide on cricoid pressure-induced relaxation of the lower esophageal sphincter (LES) in awake human volunteers. Methods With local institutional review board approval, measurements of LES and intragastric pressures were made in 10 consenting volunteers before cricoid pressure application, during 15 s of cricoid pressure application, and after release of cricoid pressure. The measurements were repeated after 0.15 mg/kg intravenous metoclopramide. Cricoid pressure was applied by one investigator trained to consistently apply a force of 44 N. Results Cricoid pressure resulted in immediate decrease in LES and barrier pressures from 14.1 +/- 2.9 mmHg to 3.2 +/- 3.7 mmHg and from 9.6 +/- 3.4 mmHg to -1.8 +/- 2.9 mmHg, respectively. These pressures promptly returned to baseline values after release of cricoid pressure. LES and barrier pressures increased after metoclopramide from 14.5 +/- 3.1 to 19.6 +/- 4.7 mmHg and from 10.2 +/- 3.6 to 14.1 +/- 5.5 mmHg, respectively. Cricoid pressure applied after metoclopramide resulted in immediate decreases in LES and barrier pressures to levels comparable to cricoid pressure before metoclopramide, but immediately returned to precricoid values after release of pressure. Conclusions The current investigation demonstrates that cricoid pressure reflexly decreases LES tone and barrier pressure in awake subjects. Although metoclopramide increased LES and barrier pressures, it did not attenuate cricoid pressure-induced relaxation of the LES and barrier pressures and thus seems to have no value in preventing gastroesophageal reflux during cricoid pressure. Metoclopramide may be useful in preventing reflux when there is need to release or discontinue cricoid pressure.
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Popivanov, Georgi, Ivan Inkov, Georgi Kovachev, Kirien Kjossev, Anthony Philipov, Mihail Tabakov, Hristo Petrov, et al. "NEGATIVE PRESSURE WOUND THERAPY IN WARTIME WOUNDS - CASE SERIES AND REVIEW OF THE LITERATURE." International Journal of Surgery and Medicine 4, no. 3 (2018): 138. http://dx.doi.org/10.5455/ijsm.negative-pressure-wound-therapy.
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Mendelowitz, D., and A. M. Scher. "Pulsatile pressure can prevent rapid baroreflex resetting." American Journal of Physiology-Heart and Circulatory Physiology 258, no. 1 (January 1, 1990): H92—H100. http://dx.doi.org/10.1152/ajpheart.1990.258.1.h92.
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In a previous study [Am. J. Physiol. 255 (Heart Circ. Physiol. 24): H673-H678, 1988] we demonstrated that baroreflex responses decay (reset) to increased static sinus pressures, but with increased pulsatile pressure, responses are maintained. To determine more conclusively whether pulsatile pressure prevents rapid baroreflex resetting in this study we examined resetting as shifts of the baroreflex (sinus pressure-arterial pressure) curve. In seven anesthesized rabbits the left sinus was vascularly isolated and conditioned for 5 min to static or pulsatile pressures of 60, 100, or 140 mmHg mean pressure, 0 or 35–40 mmHg pulse pressure. The baroreflex curve was then determined by stepwise changing sinus pressure from 40 to 160 mmHg in 20-mmHg increments. Threshold, midpoint, and saturation sinus pressures shifted 25-39% with static conditioning pressures but did not shift significantly with pulsatile pressures. Also, the baroreflex responses to step increases in static sinus pressure decayed, as resetting occurred, but did not decay with pulsatile sinus pressure increases. Thus the baroreflex rapidly resets with static pressures, but there is minimal, if any, resetting with pulsatile pressures.
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Ravaji Parab, Namita, and Shilpa Ajay Parab. "Immediate Effect of Laughter Yoga on Blood Pressure in Elevated Blood Pressure." International Journal of Science and Research (IJSR) 11, no. 10 (October 5, 2022): 460–64. http://dx.doi.org/10.21275/sr221010105933.
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VERSI, E., LINDA CARDOZO, and D. J. COOPER. "Urethral Pressures: Analysis of Transmission Pressure Ratios." British Journal of Urology 68, no. 3 (September 1991): 266–70. http://dx.doi.org/10.1111/j.1464-410x.1991.tb15320.x.
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Dunstan, D. J., N. W. A. Van Uden, and G. J. Ackland. "High Pressure Instrumentation: Low and Negative Pressures." High Pressure Research 22, no. 3-4 (January 2002): 773–78. http://dx.doi.org/10.1080/08957950212441.
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Ihsan Ali, Safia, David Patton, Kimberley A. Myers, and Julio Garcia. "Repaired Tetralogy of Fallot Pressure Assessment: Insights from 4D-Flow Pressure Mapping." Fluids 8, no. 7 (June 29, 2023): 196. http://dx.doi.org/10.3390/fluids8070196.
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Tetralogy of Fallot (TOF) is the most prevalent cyanotic congenital heart defect (CHD) that alters normal blood flow through the heart and accounts for 10% of all CHD. Pulmonary stenosis and regurgitation are common in adults who have undergone TOF repair (rTOF) and can impact the load on the right ventricle, blood flow pressure, and pulmonary hemodynamics. Pressure mapping, obtained through 4D-flow magnetic resonance imaging (4D-flow MRI), has been applied to identify abnormal heart hemodynamics in CHD. Hence, the aim of this research was to compare pressure drop and relative pressures between patients with repaired TOF (rTOF) and healthy volunteers. An in vitro validation was performed, followed by an in vivo validation. We hypothesized that pressure drop is a more stable pressure mapping method than relative pressures to detect altered hemodynamics. A total of 36 subjects, 18 rTOF patients and 18 controls underwent cardiac MRI scans and 4D-flow MRI. Pressure drops and relative pressures in the MPA were higher in rTOF patients compared to the controls (p < 0.05). Following the in vitro validation, pressure drops proved to be a more stable pressure mapping method than relative pressures, as the flow loses its laminarity and becomes more turbulent. In conclusion, this study demonstrated that flow hemodynamics in rTOF can exhibit altered pressure maps. Pressure mapping can help provide further insight into rTOF patients’ hemodynamics to improve patient care and clinical decisions.
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Wirawan, Hendra, Toetik Koesbardiati, and Sutinah. "Institutional and Social Pressure in Violating the Police Code of Ethics." Jurnal Ilmu Kepolisian 18, no. 3 (December 18, 2024): 331–52. https://doi.org/10.35879/jik.v18i3.470.
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Institutional and social pressures on police officers often lead to violations of the code of ethics. This study aims to determine how institutional and social pressures can encourage ethical violations committed by police officers. This research is a qualitative study based on in-depth interviews with seven informants to explore and precisely describe the social phenomena that occur. The theory of anomie and the new institutional theory serve as the analytical tools in this research to produce unique and comprehensive findings. The research findings affirm that there are two types of police in responding to institutional pressure: police who view institutional pressure as a whip to work harder, and police who feel pressured by that pressure. In addition to institutional pressure, police also face social pressure in the form of demands to meet public expectations, which include: (1) police as 'all- knowing gods'; (2) police as superheroes for the community; and (3) police acting as influencers. The disparity in access and resources among police officers in meeting institutional and societal expectations drives some members to experience ethical conflicts that result in violations of the code of ethics. In institutional theory, ethics should serve as a tool to regulate behavior. In reality, this is hindered by unequal access and resources for each member within an institution, in this case, police officers. As a result, police officers who do not have adequate access and resources are driven to commit ethical violations to respond to institutional and social pressures.
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VAN ROEKEL, H. E., and A. J. THURSTON. "Tourniquet Pressure: The Effect of Limb Circumference and Systolic Blood Pressure." Journal of Hand Surgery 10, no. 2 (April 1985): 142–44. http://dx.doi.org/10.1016/0266-7681_85_90002-6.
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Complications attributable to direct pressure may result from the use of pneumatic tourniquets during surgical procedures. Traditional estimates have determined the pressures employed rather than the minimal pressure necessary to produce a bloodless field. To determine this pressure, pre-operative and post-operative systolic blood pressures and the tourniquet pressure at which capillary bleeding occurred were measured in a group of patients undergoing elective surgery of the upper and lower limbs. From these results two equations were derived, one for each of the upper and lower limbs, which give the minimum tourniquet pressures to produce bloodless fields. In an average sized, normotensive patient, 200mm Hg was found to be adequate for the upper limb and 250mm Hg for the lower limb.
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Vlachopoulos, Charalambos, and Michael O’Rourke. "Diastolic pressure, systolic pressure, or pulse pressure?" Current Hypertension Reports 2, no. 3 (May 2000): 271–79. http://dx.doi.org/10.1007/s11906-000-0010-6.
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Attard, J., S. V. S. Rithalia, and J. Kulkarni. "Pressure relief characteristics in alternating pressure air cushions." Prosthetics and Orthotics International 21, no. 3 (December 1997): 229–33. http://dx.doi.org/10.3109/03093649709164561.
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In this study a computerised system was used which continuously measured air pressure, interface pressure and pressure-time cycle characteristics of an alternating pressure air cushion (APAC), and calculated the time the interface pressure remained below three chosen thresholds of 20,40 and 60mm Hg. Ten healthy volunteers were used to evaluate the pressure relieving characteristics of four APACs. Results indicated significant differences between products when the threshold periods were analysed, showing some devices were not capable of relieving interface pressures below 20mm Hg. Though deflation pressure decreased to nearer zero, interface pressure did not follow suit.
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Gnida, Anna, and Dagmara Witecy. "PRELIMINARY STUDIES ON THE INFLUENCE OF NEGATIVE PRESSURE ON ACTIVATED SLUDGE FLOCS." Zeszyty Naukowe Uniwersytetu Zielonogórskiego / Inżynieria Środowiska 170, no. 50 (July 2, 2018): 51–60. http://dx.doi.org/10.5604/01.3001.0012.7462.
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A sludge from municipal wastewater plant operated for biological contaminant removal was exposed to three different negative pressures (-200, -500 and -800 hPa) for three different duration times (30 second, 1 and 2 minutes). Sludge volume index, shear sensitivity of the sludge and activated sludge floc characteristic was the object of the study before and after negative pressure treatment. After the treatment the sludge settled better independently on the pressure value and duration time. The shear sensitivity changed the most when the pressure exposure of -800 hPa was 1 minute and longer. The flocs structure was more open after negative pressur and larger part of activated sludge was comprised by large flocs.
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Bazhin, N. M., and V. N. Parmon. "Hydroosmotic pressure." Доклады Академии наук 484, no. 1 (May 1, 2019): 52–55. http://dx.doi.org/10.31857/s0869-5652484152-55.
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This work proposes the term “hydroosmotic pressure” to define hydrostatic pressure emerging from an osmotic process during solvent diffusion through membranes. The usage of this term potentially clears the ambiguity of the term “osmotic pressure,” referring to the concentration of dissolved solids in a solution regardless of the existence of hydrostatic pressure. Hydroosmotic pressure is the difference between hydrostatic pressures on either side of the membrane; thus, the term “hydroosmotic pressure” allows for the most correct definition of many processes associated with osmotic phenomena.
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Aldea, G. S., H. Mori, W. K. Husseini, R. E. Austin, and J. I. E. Hoffman. "Effects of increased pressure inside or outside ventricles on total and regional myocardial blood flow." American Journal of Physiology-Heart and Circulatory Physiology 279, no. 6 (December 1, 2000): H2927—H2938. http://dx.doi.org/10.1152/ajpheart.2000.279.6.h2927.
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Increasing pressures to 30 mmHg in right (RV) and left (LV) ventricles and surrounding heart (SH) in isolated, arrested, maximally vasodilated, blood-perfused dog hearts shifted pressure-flow (PF) curves rightward and increased zero flow pressure (Pzf) by an amount equal to the RV applied pressure, SH applied pressure, or two-thirds of the LV applied pressure. There were comparable increases in coronary venous pressures. Increasing LV or SH pressures decreased coronary blood flows, especially in the subendocardium. Decreases in driving pressure decreased flows in all layers, but even with driving pressure of 5 mmHg, a few subepicardial pieces had flow. We conclude with the following: 1) raising pressures inside or outside the heart shifts PF curves and raises Pzfby increasing coronary venous pressure; 2) the effects are most prominent in the subendocardial muscle layer; and 3) as driving pressures are decreased, there is a range of Pzfin the heart with the final Pzfrecorded due to the last little piece of muscle to be perfused.
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KOCA, Uğur. "Airway Pressure Release Ventilation." Turkiye Klinikleri Journal of Anesthesiology Reanimation 16, no. 1 (2018): 14–17. http://dx.doi.org/10.5336/anesthe.2017-57257.
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Shavkat o‘g‘li, Fayzullayev Jahongir. "BLOOD PRESSURE MEDICINAL PLANTS." International Journal of Medical Science and Public Health Research 03, no. 04 (April 1, 2022): 5–8. http://dx.doi.org/10.37547/ijmsphr/volume03issue04-02.
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In this article all about medicinal herbs are widely used in folk medicine due to their blood pressure effectiveness. It is also widely used in the pharmaceutical industry to obtain extracts from them.
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KOSIYUK, M., А. KOSIYUK, and V. KRAVCHUK. "MODULAR VOLUME PRESSURE MACHINE." Herald of Khmelnytskyi National University. Technical sciences 285, no. 3 (May 28, 2020): 105–8. https://doi.org/10.31891/2307-5732-2020-285-3-17.
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Currently widely used volumetric displacement machines (MOV), which include thermal machines (internal combustion, with external heat supply, steam); hydraulic and pneumatic engines; pumps; compressors, etc. They contain at least one working body mounted in a housing with the possibility of translational (oscillating) motion, and a direction converter capable of receiving or rotating the input shaft with its transformation into translational (oscillating) motion of the working body or translational (oscillating) motion of the working body with transformation its in the rotational motion of the output shaft. The development of kinematic schemes and constructions of new languages is an extremely urgent task. The issues of development of kinematic diagrams and structures of new machines and mechanisms are contemplated. The analysis of patent activity in recent years displays an increase in attention of designers to the development of volume displacement machines of various purposes. The authors developed the volume displacement machine, using the original design of the converter of rotation motion into oscillatory motion and vice versa. Its uniqueness lies in the fact that symmetry axes of all parts that rotate and move intersect only at one point, at the same time there is no need to balance inertial masses, there is no vibration and high characteristics are achieved with reliability and service life. The motion converter can perform various functions, in particular, as an actuator of motors, compressors, pumps and allows to make a technological breakthrough in the sphere of creation of volume displacement machines. Using the suggested design solutions makes it possible to develop a unified number of modular machines of large displacement with oscillating movement of the working element, significantly reduce their cost and obtain a significant economic effect.
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Bono, F., D. Salvino, T. Tallarico, D. Cristiano, F. Condino, F. Fera, PL Lanza, A. Lavano, and A. Quattrone. "Abnormal pressure waves in headache sufferers with bilateral transverse sinus stenosis." Cephalalgia 30, no. 12 (May 12, 2010): 1419–25. http://dx.doi.org/10.1177/0333102410370877.
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Introduction: Bilateral transverse sinus stenosis (BTSS) has been reported to be associated with idiopathic intracranial hypertension without papilloedema in headache sufferers. Subjects and methods: To test the accuracy of short-term cerebrospinal fluid (CSF) pressure monitoring through a lumbar needle for detection of elevated intracranial pressure in headache sufferers with BTSS, we prospectively performed lumbar puncture in order to measure lumbar CSF opening pressures and to monitor, for 1 h, the CSF pressure in 48 consecutive headache sufferers with BTSS and in 50 consecutive headache sufferers with normal appearance of transverse sinuses or stenosis of one transverse sinus. Results: Of the 48 headache sufferers with BTSS, 18 (37.5%) had elevated CSF opening pressure and abnormal pressure waveforms, but short-term CSF pressure monitoring revealed abnormal pressure waves associated with elevated mean CSF pressure also in 26 (86.6%) out of 30 patients who had normal opening pressures. None of the 50 headache sufferers with normal appearance of transverse sinuses or stenosis of one transverse sinus had abnormal pressure waves and elevated CSF pressures. Conclusions: In this study, short-term CSF pressure monitoring through a lumbar needle revealed abnormal pressure waves and elevated mean CSF pressures in the majority of headache sufferers with BTSS who had normal CSF opening pressures. These findings demonstrate the accuracy of short-term CSF pressure monitoring through a lumbar needle in estimating CSF pressure; they also highlight that a single-spot opening pressure measurement has a low accuracy for recognition of increased intracranial pressure in headache sufferers with BTSS.
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Mistik, Selcuk, Kevser Goktas, Demet Unalan, Abdurrahman Oguzhan, and Bulent Tokgöz. "Normal Variations in Blood Pressure in Ambulatory Blood Pressure Measurements." Eurasian Journal of Family Medicine 10, no. 1 (March 30, 2021): 1–6. http://dx.doi.org/10.33880/ejfm.2021100101.
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Aim: Hypertension is very common in primary care patients. The diagnosis of hypertension is made by office measurements and home blood pressure measurements. The aim of this study was to define the normal variation levels of blood pressure in individuals in primary care by using ambulatory blood pressure measurement. Methods: This study was performed in primary care. Individuals who had no hypertension history were included in the study. Subjects were evaluated by using three office measurements, seven days home blood pressure measurements and 24 hours ambulatory blood pressure measurement. The ambulatory blood pressure gave us the variations in blood pressure values. Results: The study started in January 2018 and ended in May 2018. Of the 47 subjects, 70.2% were women and 29.8% were men. The mean age was 41.63±12.00. The most common educational level was elementary school graduates. The most common occupation was housewives. Of the participants, 84.2% were married. At ambulatory blood pressure measurements, 34.0% of the subjects had mean systolic blood pressures 24 hours between 120-129 mmHg. Of the diastolic blood pressure 24 hours mean values, 15.3% had values between 80-89, where 51.0% were between the 71-79 mmHg groups. The mean value of 24 hours variation in systolic blood pressure was 15.75±18.59 (median=11.40, min=8.80, max=106.00). The 24 hours variation in the mean values of diastolic blood pressures was 12.12±10.90 (median=9.70, min=6.80, max=64.00). Conclusion: The results of this study demonstrated that there were high levels of variations in normal blood pressures, which could show candidates for hypertension. Keywords: ambulatory monitoring, blood pressure, variability, primary care
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Davis, M. J. "Microvascular control of capillary pressure during increases in local arterial and venous pressure." American Journal of Physiology-Heart and Circulatory Physiology 254, no. 4 (April 1, 1988): H772—H784. http://dx.doi.org/10.1152/ajpheart.1988.254.4.h772.
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The extent to which capillary hydrostatic pressure might be protected from increases in local arterial and venous pressure was examined in the wing microcirculation of unanesthetized pallid bats (Antrozous pallidus). Arterial inflow and venous outflow pressures to the wing were elevated using a box technique to increase pressure around the body of the animal in steps of 12 mmHg between 0 and +60 mmHg for 3-min periods. During this time, hydrostatic pressure, diameter, and red cell velocity in single microvessels were continuously recorded. All branching orders of arterioles constricted significantly during increases in box pressure (Pb), while capillaries and venules dilated. First-order arteriole and venule pressures increased 1:1 with Pb. Capillary pressures increased by only a fraction of Pb up to +36 mmHg, but at higher Pb, the change in capillary pressure was equivalent to the change in Pb. Calculations of vascular resistance indicate that changes in both pre- and postcapillary resistance in this tissue act to prevent increases in capillary pressure during moderate, but not during large, increases in arterial and venous pressure.
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Lowrie, Allen, and Susan Moffett. "Pressure Compartments, Existent and Suggested, along the Louisiana Continental Margin." Energy Exploration & Exploitation 16, no. 4 (August 1998): 345–54. http://dx.doi.org/10.1177/014459879801600404.
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Pressure compartments are the result of lithology, the ability to contain/expell fluids, and stresses from the dynamics of whatever tectonics operate in the area. In the northern Gulf of Mexico, a normal pressured unit overlies a geopressured or over-pressured compartment that both rest above the salt. Directly northward of the Sigsbee Escarpment, there is a relatively thin, low-velocity zone known locally as a “gumbo zone”. Here two other pressure compartments are proposed. The origin of them is two-fold. First, initial sedimentation consists of pelagic clay draped over oceanic and transitional crust. Later, as the continental margin progrades nearer sedimentation becomes hemipelagic and coarser as gravity-driven sediments predominate. Secondly, as the salt wedge overrides a given spot of the basement, it is possible to develop a shear couple between the migrating salt and the stationary basement. The resultant shear (the site of the next strike-slip fault) may change pressures beneath the salt such that the shear may create two pressure compartments. The differences between the two compartments may be accentuated by lithologic changes caused by depositional mechanisms.
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Barbenel, J. C. "Pressure management." Prosthetics and Orthotics International 15, no. 3 (December 1991): 225–31. http://dx.doi.org/10.3109/03093649109164292.
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The prevention or minimisation of the occurrence of pressure sores is an important consideration in the rehabilitation of physically disabled people, especially for the wheelchair user with a spinal cord injury. Although there is little definitive information on the cause of pressure sores, several intrinsic and extrinsic factors have been highlighted. Probably the most significant causative factor is the application of force to the skin surface. The relationship between the magnitude of pressure and its duration; the temperature and humidity at the interface; and the physiological effects that this has on the microcirculation and lymphatic drainage are discussed in this article. It is suggested that a rationale for the prevention of pressure sores includes the limitation of the duration of pressures applied to the skin surface and the reduction of the peak pressures particularly at vulnerable sites. In this context the design criteria for a clinical interface pressure measurement system, and the uses and limitations of the commercially available options, are considered. The development of a structured programme of wheelchair and support surface provision, assessment and follow-up is required.
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House, S. D., and P. C. Johnson. "Microvascular pressure in venules of skeletal muscle during arterial pressure reduction." American Journal of Physiology-Heart and Circulatory Physiology 250, no. 5 (May 1, 1986): H838—H845. http://dx.doi.org/10.1152/ajpheart.1986.250.5.h838.
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It has been suggested from whole organ studies that the viscosity of blood in skeletal muscle venules varies inversely with flow over physiological flow ranges. If this is the case, the hydrostatic pressure gradient in venules should change less than flow as flow is altered. To test this hypothesis, pressure in venules of cat sartorius muscle was measured during stepwise arterial pressure reduction to 20 mmHg. Large vein pressure remained constant at about 5 mmHg. Average pressures in the large venules (40–185 microns) ranged from 13.6 to 10.0 mmHg. The difference between pressure in these venules and large vein pressure fell in proportion to the reduction in blood pressure and blood flow. Pressures in the smallest venules studied (25 microns) averaged 19.7 +/- 6.2 (SD) mmHg. The pressure difference between the smallest venules and the large vein fell less than the arteriovenous pressure difference or blood flow when arterial pressure was reduced. During reactive hyperemia the pressure gradient between the smallest venules and the large vein rose proportionately less than blood flow. The stability of pressure in the smallest venules is consistent with the hypothesis that blood viscosity varies inversely with flow rate.
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Karki, Sanjit, and Madhur Dev Bhattarai. "Correlation of Central with Jugular and Upper-limb Venous Pressure Measurements." Journal of Nepal Health Research Council 18, no. 1 (April 20, 2020): 35–40. http://dx.doi.org/10.33314/jnhrc.v18i1.2406.
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Background: Correlation data of different external reference points and methods used to measure venous pressures are scarce in the literature. We correlated central venous pressure with jugular venous pressure measured from sternal angle and with jugular and upper-limb venous pressures from zero level corresponding to mid-right-atrium level. Methods: A hospital-based observational study in the medical and surgical intensive care units was conducted for period of one year.” Central venous pressure was measured from right fourth intercostal space in mid-axillary line and jugular venous pressure from sternal angle and jugular and upper-limb venous pressures from horizontal plane through the midpoint of anteroposterior line from anterior end of right fourth intercostal space to back. We measured central venous pressure by central venous cannulation and jugular and upper-limb venous pressures clinically by JVP Meter®. Upper-limb venous pressure was indicated by collapse of visible veins in dorsum of hands as the arm was slowly raised from dependent position.Results: Correlation coefficient (r) values were 0.61 between central venous pressure and jugular venous pressure from zero level, 0.48 between central venous pressure and jugular venous pressure from sternal angle, and 0.31 between central and upper-limb venous pressures; and 0.67 and 0.50 between central venous pressure measured from right internal jugular vein and jugular venous pressure from zero level and sternal angle respectively and0.52 and 0.44 between central venous pressure from right sub-clavian vein and jugular venous pressure from zero level and sternal angle respectively. Conclusions: Different correlation values indicate the need to have future investigations and consensus on the common external reference point and methods to measure venous pressures. Keywords: CVP; heart failure; JVP; JVP Meter; shock
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Kimura, Tatsuto, Masahiro Masuko, Naoki Fujii, Hideki Kaida, and Naoto Kihara. "NUMERICAL AND HYDRAULIC EXPERIMENTS ON BORE PRESSURE DUE TO TSUNAMI." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 18. http://dx.doi.org/10.9753/icce.v36.currents.18.
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The 2011 Tohoku earthquake tsunami struck a wide area of the northeastern coast of Japan, and many coastal structures and buildings were damaged by the tsunami. Most of the buildings were damaged by the tsunami wave pressure. After the tsunami, characteristics of tsunami waive pressures have been investigated by many researcher, and are being clarified. As shown in previous studies, there are three regimes charactering the vertical pressure profiles. The first one is the impulsive pressure, which is observed just after the tsunami-bore impacted structures. In this regime, strong hydrodynamic pressures are generated by the fluid-solid impact process. After that, the bore pressure is observed, and both the hydrodynamic and hydrostatic pressures contribute the pressure profile. After that, the flow near the structures reaches a quasi-steady state, and the pressure profile becomes hydrostatic. Most of the evaluation equations of tsunami wave pressure proposed by the previous studies can be used against the impulsive pressures and the pressures in the quasi-steady-state regime. On the other hand, the characteristics and quantitative evaluations of the bore pressure remain immature. In this study, in order to clarify the characteristics of the bore pressure, experiments on the bore pressure are carried out, and furthermore, three-dimensional numerical simulations are also carried out.
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Glucksberg, M. R., and J. Bhattacharya. "Effect of alveolar and pleural pressures on interstitial pressures in isolated dog lungs." Journal of Applied Physiology 70, no. 2 (February 1, 1991): 914–18. http://dx.doi.org/10.1152/jappl.1991.70.2.914.
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We report the first direct measurements of perialveolar interstitial pressures in lungs inflated with negative pleural pressure. In eight experiments, we varied surrounding (pleural) pressure in a dog lung lobe to maintain constant inflation with either positive alveolar and ambient atmospheric pleural pressures (positive inflation) or ambient atmospheric alveolar and negative pleural pressures (negative inflation). Throughout, vascular pressure was approximately 4 cmH2O above pleural pressure. By the micropuncture servo-null technique we recorded interstitial pressures at alveolar junctions (Pjct) and in the perimicrovascular adventitia (Padv). At transpulmonary pressure of 7 cmH2O (n = 4), the difference of Pjct and Pady from pleural pressure of 0.9 +/- 0.4 and -1.1 +/- 0.2 cmH2O, respectively, during positive inflation did not significantly change (P less than 0.05) after negative inflation. After increase of transpulmonary pressure from 7 to 15 cmH2O (n = 4), the decrease of Pjct by 3.3 +/- 0.3 cmH2O and Pady by 2.0 +/- 0.4 cmH2O during positive inflation did not change during negative inflation. The Pjct-Pady gradient was not affected by the mode of inflation. Our measurements indicate that, in lung, when all pressures are referred to pleural or alveolar pressure, the mode of inflation does not affect perialveolar interstitial pressures.
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Tilmont, Antoine, Benjamin Coiffard, Takeshi Yoshida, Florence Daviet, Karine Baumstarck, Geoffrey Brioude, Sami Hraiech, et al. "Oesophageal pressure as a surrogate of pleural pressure in mechanically ventilated patients." ERJ Open Research 7, no. 1 (January 2021): 00646–2020. http://dx.doi.org/10.1183/23120541.00646-2020.
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BackgroundOesophageal pressure (Poes) is used to approximate pleural pressure (Ppl) and therefore to estimate transpulmonary pressure (PL). We aimed to compare oesophageal and regional pleural pressures and to calculate transpulmonary pressures in a prospective physiological study on lung transplant recipients during their stay in the intensive care unit of a tertiary university hospital.MethodsLung transplant recipients receiving invasive mechanical ventilation and monitored by oesophageal manometry and dependent and nondependent pleural catheters were investigated during the post-operative period. We performed simultaneous short-time measurements and recordings of oesophageal manometry and pleural pressures. Expiratory and inspiratory PL were computed by subtracting regional Ppl or Poes from airway pressure; inspiratory PL was also calculated with the elastance ratio method.Results16 patients were included. Among them, 14 were analysed. Oesophageal pressures correlated with dependent and nondependent pleural pressures during expiration (R2=0.71, p=0.005 and R2=0.77, p=0.001, respectively) and during inspiration (R2=0.66 for both, p=0.01 and p=0.014, respectively). PL values calculated using Poes were close to those obtained from the dependent pleural catheter but higher than those obtained from the nondependent pleural catheter both during expiration and inspiration.ConclusionsIn ventilated lung transplant recipients, oesophageal manometry is well correlated with pleural pressure. The absolute value of Poes is higher than Ppl of nondependent lung regions and could therefore underestimate the highest level of lung stress in those at high risk of overinflation.
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Maric, Filip, Margherita Poto, and Giuliana Panieri. "Under pressure." Septentrio Educational, no. 1 (April 28, 2023): 78–80. http://dx.doi.org/10.7557/8.7056.
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 Focus:
 To understand and feel how water pressure changes with depth.
 Learning objectives:
 In this activity, pupils will recognize the relationship between water depth and pressure. Pupils will be able to reflect on how lifeforms in the deep sea might be affected by the high water pressures in their ecosystems.
 Key words:
 Depth, weight, pressure.
 
 
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Mathew, Oommen P. "Effects of transient intrathoracic pressure changes (hiccups) on systemic arterial pressure." Journal of Applied Physiology 83, no. 2 (August 1, 1997): 371–75. http://dx.doi.org/10.1152/jappl.1997.83.2.371.
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Mathew, Oommen P. Effects of transient intrathoracic pressure changes (hiccups) on systemic arterial pressure. J. Appl. Physiol. 83(2): 371–375, 1997.—The purpose of the study was to determine the effect of transient changes in intrathoracic pressure on systemic arterial pressure by utilizing hiccups as a tool. Values of systolic and diastolic pressures before, during, and after hiccups were determined in 10 intubated preterm infants. Early-systolic hiccups decreased systolic blood pressure significantly ( P < 0.05) compared with control (39.38 ± 2.72 vs. 46.46 ± 3.41 mmHg) and posthiccups values, whereas no significant change in systolic blood pressure occurred during late-systolic hiccups. Diastolic pressure immediately after the hiccups remained unchanged during both early- and late-systolic hiccups. In contrast, diastolic pressure decreased significantly ( P < 0.05) when hiccups occurred during diastole (both early and late). Systolic pressures of the succeeding cardiac cycle remained unchanged after early-diastolic hiccups, whereas they decreased after late-diastolic hiccups. These results indicate that transient decreases in intrathoracic pressure reduce systemic arterial pressure primarily through an increase in the volume of the thoracic aorta. A reduction in stroke volume appears to contribute to the reduction in systolic pressure.