Relevant bibliographies by topics / Hemodynamic sensor

Academic literature on the topic 'Hemodynamic sensor'

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Published: 11 March 2023

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Journal articles on the topic "Hemodynamic sensor"

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Turcott, Robert. "Extravascular hemodynamic acoustic sensor." Journal of the Acoustical Society of America 113, no. 5 (2003): 2397. http://dx.doi.org/10.1121/1.1584191.

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Weidenmüller, Jens, Oezgue Dogan, Alexander Stanitzki, Mario Baum, Tim Schröder, Dirk Wünsch, Michael Görtz, and Anton Grabmaier. "Implantable multi-sensor system for hemodynamic controlling." tm - Technisches Messen 85, no. 5 (May 25, 2018): 359–65. http://dx.doi.org/10.1515/teme-2017-0116.

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Abstract A miniaturized implantable multi-sensor system for cardiovascular monitoring of physiological parameters is presented. High accuracy pressure measurements within the vessel can be performed by a capacitive pressure sensor. Additional information about the patient, e. g., sudden movement, inclination or increased temperature can be obtained by additional sensor components such as an acceleration sensor and a temperature sensor unit. This information facilitates compensation of interferences for more accurate pressure measurements. A multi-functional ASIC enables, amongst others, sensor signal processing, power management and telemetric communication with extracorporeal electronics. Sensor chips, the multi-functional ASIC and passive components are assembled on a LTCC circuit board in which an antenna coil is integrated for telemetric energy and data transmission at a frequency of 13.56 MHz. In order to support further miniaturization, the implant shall be encapsulated with a stack of very thin and hermetic ceramics applied by ALD instead of using bulky metal housings. Further encapsulation with polymers, which can be functionalised with appropriate biomolecules, is necessary for a proper shape, a biocompatible interface to the surrounding tissue and, thereby, reduction of thrombogenicity.
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NABUTOVSKY, YELENA, TODD PAVEK, and ROBERT TURCOTT. "Chronic Performance of a Subcutaneous Hemodynamic Sensor." Pacing and Clinical Electrophysiology 35, no. 8 (May 3, 2012): 919–26. http://dx.doi.org/10.1111/j.1540-8159.2012.03419.x.

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Lippert, M., E. Zima, G. Czygan, and B. Merkely. "INTRACARDIAC IMPEDANCE AS HEMODYNAMIC SENSOR: FEASIBILITY STUDY." Biomedizinische Technik/Biomedical Engineering 48, s1 (2003): 248–49. http://dx.doi.org/10.1515/bmte.2003.48.s1.248.

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Oláh, Attila, Mihály Ruppert, Tamás István Orbán, Ágota Apáti, Balázs Sarkadi, Béla Merkely, and Tamás Radovits. "Hemodynamic characterization of a transgenic rat strain stably expressing the calcium sensor protein GCaMP2." American Journal of Physiology-Heart and Circulatory Physiology 316, no. 5 (May 1, 2019): H1224—H1228. http://dx.doi.org/10.1152/ajpheart.00074.2019.

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A novel transgenic rat strain has recently been generated that stably expresses the genetically engineered calcium sensor protein GCaMP2 in different cell types, including cardiomyocytes, to investigate calcium homeostasis. To investigate whether the expression of the GCaMP2 protein itself affects cardiac function, in the present work we aimed at characterizing in vivo hemodynamics in the GCaMP2 transgenic rat strain. GCaMP2 transgenic rats and age-matched Sprague-Dawley control animals were investigated. In vivo hemodynamic characterization was performed by left ventricular (LV) pressure-volume analysis. Postmortem heart weight data showed cardiac hypertrophy in the GCaMP2 group (heart-weight-to-tibial-length ratio: 0.26 ± 0.01 GCaMP2 vs. 0.23 ± 0.01 g/cm Co, P < 0.05). We detected elevated mean arterial pressure and increased total peripheral resistance in transgenic rats. GCaMP2 transgenesis was associated with prolonged contraction and relaxation. LV systolic function was not altered in transgenic rats, as indicated by conventional parameters and load-independent, sensitive indices. We found a marked deterioration of LV active relaxation in GCaMP2 animals (τ: 16.8 ± 0.7 GCaMP2 vs. 12.2 ± 0.3 ms Co, P < 0.001). Our data indicated myocardial hypertrophy, arterial hypertension, and impaired LV active relaxation along with unchanged systolic performance in the heart of transgenic rats expressing the GCaMP2 fluorescent calcium sensor protein. Special caution should be taken when using transgenic models in cardiovascular studies. NEW & NOTEWORTHY Genetically encoded Ca2+-sensors, like GCaMP2, are important tools to reveal molecular mechanisms for Ca2+-sensing. We provided left ventricular hemodynamic characterization of GCaMP2 transgenic rats and found increased afterload, cardiac hypertrophy, and prolonged left ventricular relaxation, along with unaltered systolic function and contractility. Special caution should be taken when using this rodent model in cardiovascular pharmacological and toxicological studies.
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Benza, Raymond L., Mark Doyle, David Lasorda, Kishan S. Parikh, Priscilla Correa-Jaque, Nima Badie, Greg Ginn, et al. "Monitoring Pulmonary Arterial Hypertension Using an Implantable Hemodynamic Sensor." Chest 156, no. 6 (December 2019): 1176–86. http://dx.doi.org/10.1016/j.chest.2019.06.010.

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Morton, Patricia Gonce. "Rate-Responsive Cardiac Pacemakers." AACN Advanced Critical Care 2, no. 1 (February 1, 1991): 140–49. http://dx.doi.org/10.4037/15597768-1991-1022.

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Pacemaker technology continues to advance in the direction of restoring a normal hemodynamic response under varying physiologic conditions. Rate-responsive pacemakers meet this challenge by adjusting the pacing rate in response to a sensed physiologic variable other than sinus node activity. In an effort to design the ideal rate-responsive system, various physiologic cues have been tested. To translate shifts in the sensed physiologic indicator into an appropriate pacing rate, specialized sensor systems also have been developed and include mechanical, chemical, thermal, and electrical sensors. Although each sensor system offers advantages and disadvantages, continued research and clinical experience will determine the future of this exciting new form of cardiac pacing
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Illa, Míriam, Laura Pla, Sergio Berdún, Mònica Mir, Lourdes Rivas, Samuel Dulay, Nicole Picard-Hagen, Josep Samitier, Eduard Gratacós, and Elisenda Eixarch. "Miniaturized Electrochemical Sensors to Monitor Fetal Hypoxia and Acidosis in a Pregnant Sheep Model." Biomedicines 9, no. 10 (September 28, 2021): 1344. http://dx.doi.org/10.3390/biomedicines9101344.

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Perinatal asphyxia is a major cause of severe brain damage and death. For its prenatal identification, Doppler ultrasound has been used as a surrogate marker of fetal hypoxia. However, Doppler evaluation cannot be performed continuously. We have evaluated the performance of a miniaturized multiparametric sensor aiming to evaluate tissular oxygen and pH changes continuously in an umbilical cord occlusion (UCO) sheep model. The electrochemical sensors were inserted in fetal hindlimb skeletal muscle and electrochemical signals were recorded. Fetal hemodynamic changes and metabolic status were also monitored during the experiment. Additionally, histological assessment of the tissue surrounding the sensors was performed. Both electrochemical sensors detected the pO2 and pH changes induced by the UCO and these changes were correlated with hemodynamic parameters as well as with pH and oxygen content in the blood. Finally, histological assessment revealed no signs of alteration on the same day of insertion. This study provides the first evidence showing the application of miniaturized multiparametric electrochemical sensors detecting changes in oxygen and pH in skeletal muscular tissue in a fetal sheep model.
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Mahnken, Andreas H., Ute Urban, Holger Fassbender, Uwe Schnakenberg, Felix Schoth, and Thomas Schmitz-Rode. "Telemetric Catheter-Based Pressure Sensor for Hemodynamic Monitoring: Experimental Experience." CardioVascular and Interventional Radiology 32, no. 4 (April 2, 2009): 714–19. http://dx.doi.org/10.1007/s00270-009-9556-0.

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Smolyakov, Yuri N., Boris I. Kuznik, Svetlana A. Kalashnikova, Nikolay A. Nolfin, Ekaterina V. Fedorenko, and Mankhar Mikhailovich Mikhahanov. "Adaptation reactions of hemodynamic systems on artificially modulated stress in healthy individuals." I.P. Pavlov Russian Medical Biological Herald 27, no. 4 (January 11, 2020): 443–50. http://dx.doi.org/10.23888/pavlovj2019274443-450.

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Aim. To study the influence of artificially created stress on hemodynamic parameters of peripheral microcirculation and variability of the heart rhythm in somatically healthy young individuals. Materials and Methods. In the study 30 individuals were involved (of them 16 men) with the mean age 18.21.1 years. An artificial stress was created using Stroop method. Assessment of characteristics of hemodynamics of microcirculation (HM) was performed by the method of dynamic scattering of light from erythrocytes. The signal was integrated in the form of three hemodynamic indexes: HI (Hemodynamic Indexes). Low frequency index (HI1) was determined by a slow interlayer interaction, high frequency area (HI3) characterized fast shearing of layers. HI2 took intermediate position (precapillary and capillary blood flow). Variability of cardiointervals isolated from pulse component, was assessed by method of variation pulsometry (Heart Rate Variability, HRV). Results. In the course of study, increase in the heart rate (HR) in the stage of testing was observed that confirms a high extent of stress load. In hemodynamics, redistribution of blood flow was noted toward slow shear velocities (near-wall blood flow). After cessation of stress load, hemodynamic parameters declined and returned to previous values. Parameters characterizing variability of rhythm LF (sympathetic component), HF (vagal activity), CVI (non-linear parasympathetic index) showed a tendency to growth; here, LF/HF ratio did not change. Conclusion. In result of the carried out study it was possible to formulate a multifactor picture of variation of parameters of microcirculation and of autonomic regulation of cardiac rhythm specific of reactions of adaptation to induced stress. The quantitative criteria of the obtained shears may be integrated into stress indexes to be used in clinical practice. A portable mDLS sensor may be supplemented with specific assessment criteria and used for monitoring of adaptive reactions induced by stressful situations, and for taking early diagnostic and prognostic decisions in the clinical practice, and for self-control of a patient.
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Dissertations / Theses on the topic "Hemodynamic sensor"

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Tomasic, Danko. "Cardiac pacing lead as hemodynamic sensor." Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4521.

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2009/2010
Therapy delivery in modern cardiac electrotherapy systems is based almost exclusively on the information about cardiac electrical depolarization. This kind of detection lacks any data about the myocardial contraction. An optimal heart rhythm control should integrate the assessment of the mechanical cardiac activity and related hemodynamic parameters to the already existing electrical signal analysis. A hemodynamic sensor integrated in pacing systems would be a valuable instrument for many applications. Only few hemodynamic sensors integrated in cardiac electrotherapy systems are currently available on the market. In order to fill the gap, I have explored the possibility of building a hemodynamic sensor for myocardial contraction detection that could be easily integrated in the existing cardiac pacing and defibrillator leads. In this thesis I propose two sensors. One is based on tribolectricity and the other one requires the measurement of high frequency lead parameters. The triboelectric sensor system measures the charge generated due to the triboelectric effect between one of the lead conductors and the inserted stylet as a result of the lead bending. The measurement system consists in sterile charge amplifiers for use in sterile operation field and a non-sterile enclosure containing isolation amplifiers and power supply. Atrial and right ventricular tensiometric signals were recorded during numerous ovine and human experiments and have shown good results under different measurement conditions. The main downside is the necessity of the additional hardware in terms of chronic stylet insertion in the pacing lead lumen. The sensor based on the measurement of high frequency (HF) pacing lead parameters has its origin in previous extensive in vitro experiments on the HF characteristics of the lead. These experiments have supported the idea of considering any bipolar lead to be a HF transmission line with its characteristic impedance and attenuation. An original study revaluing lead HF parameters after being soaked for more than a decade in the saline solution is presented. A parallel study on dry new leads was also carried out. The hemodynamic HF sensor is based on the variation of the pacing lead HF impedance and reflection coefficient due to its movement during cardiac contractions. The quality of the signal was proven in a series of ovine and human experiments and during dobutamine test in sheep. Both sensors would be feasible hemodynamic sensors for various applications: capture management, rate responsiveness, heart failure monitoring, CRT optimization, tachycardia hemodynamic stability assessment, AF therapy titration and vasovagal syncope prediction. These two sensors are unique for their simplicity and universality for all existing endovenous bipolar cardiac leads.
Nei moderni sistemi di stimolazione cardiaca, la terapia si basa quasi esclusivamente sull'informazione proveniente dalla depolarizzazione elettrica del miocardio. Questo metodo tuttavia, non prende in considerazione la componente meccanica della contrazione del muscolo cardiaco. Un sistema ottimale per il controllo dell'attività cardiaca dovrebbe valutare sia il segnale elettrico proveniente dal cuore sia i parametri emodinamici correlati alla contrazione del miocardio. Pertanto, un sensore emodinamico integrato nei sistemi di stimolazione cardiaca sarebbe uno strumento utile per varie applicazioni. Attualmente sul mercato sono disponibili pochi sensori emodinamici integrati nei sistemi di elettroterapia cardiaca. Nel mio progetto di ricerca ho investigato la possibilitŕ di realizzare un sensore emodinamico per la rivelazione delle contrazioni cardiache, che potesse essere facilmente integrato negli esistenti elettrocateteri per la stimolazione e defibrillazione. Ho proposto due sensori. Il primo si basa sull'effetto triboelettrico, il secondo misura le variazioni dei parametri degli elettrocateteri usati ad alta frequenza. Il primo sensore rileva la carica generata per effetto triboelettrico tra uno dei conduttori dell'elettrocatetere e il mandrino a forma di filo isolato, come conseguenza della piegatura dell'elettrocatetere durante le contrazioni del miocardio. Il sistema di rilevazione è composto da amplificatori sigillati e sterilizzati per l'utilizzo in campo operatorio sterile. Completa il sistema una scatola contenente l'alimentazione e amplificatori isolati, per l'uso al di fuori del campo sterile. Segnali elettrici sono stati registrati nell'atrio e ventricolo destro di ovini e umani, nel corso di numerosi esperimenti eseguiti in condizioni diverse. I risultati ottenuti confermano la fattibilitŕ di questo tipo di sensore, il cui maggiore svantaggio è rappresentato dalla necessità di tenere un supplementare mandrino isolato nell'elettrocatetere impiantato cronicamente. Il sensore basato sulla misurazione dei parametri in alta frequenza dell'elettrocatetere trova sue origini negli sperimenti sulle caratteristiche in alta frequenza dei cateteri considerati come una linea di trasmissione con un'impedenza caratteristica e l'attenuazione tipica della linea. Nella tesi viene descritto lo studio comparativo di questi parametri sugli stessi cateteri prima e dopo la loro immersione nella soluzione fisiologica per più di dieci anni. Inoltre, viene descritto lo stesso sperimento fatto con 15 nuovi cateteri. Il secondo sensore proposto si basa sulla misura della variazione dell'impedenza e del coefficiente di riflessione dell'elettrocatetere, considerato come una linea di trasmissione che viene piegata per effetto delle contrazioni del miocardio. La buona qualitŕ del segnale ottenuto è stata verificata con vari esperimenti condotti su ovini e umani. Il sensore è stato anche testato negli animali in ritmo artificialmente accelerato usando l'infusione di dobutamina. Entrambi i sensori proposti potrebbero venire impiegati in molteplici applicazioni nel campo dell'elettrostimolazione: adattamento automatico della corrente di stimolazione, stimolazione antibradicardica con frequenza adatta in pazienti cronotropicamente poco efficienti, monitoraggio dello scompenso cardiaco, ottimizzazione della CRT, valutazione della stabilitŕ emodinamica della tachicardia ventricolare, adattamento della terapia per la fibrillazione atriale e predizione della sincope neurocardiogenica. I due sensori descritti sono unici in termini di semplicità e versatilità, potendo venire integrati in tutti gli elettrocateteri bipolari attualmente presenti sul mercato.
XXII Ciclo
1980
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St-Amant, Gabrielle. "Understanding the Hemodynamic Response and Sensory Contributions to Automatic Postural Control." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39554.

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The postural control-cognition dual-task literature has demonstrated greater postural stability through the examination of multiple kinetic and kinematic measures. Recently, sample entropy (SampEn) and wavelet discrete transform have supported the claim of automaticity, as higher SampEn values and a shift toward higher contribution from automatic sensory systems have been demonstrated in dual-task settings. In order to understand the cortical component of postural control, functional near-infrared spectroscopy (fNIRS) has been used to identify cortical activation under postural control conditions. However, the neural correlates of automatic postural behaviour have yet to be fully investigated. Therefore, the purpose of this study is to confirm the presence of automatic postural control through static and dynamic measurements, and to investigate the prefrontal cortex activation (PFC) when concurrently performing quiet standing and auditory cognitive tasks. Eighteen healthy young adults (21,4 ± 3,96yo), 12 females and 6 males, with no balance deficits were recruited. Participants were instructed to either quietly stand on a force platform (SM), perform three cognitive tasks while seated (SC) and perform a combination of SM and SC concurrently (DT). Results revealed automatic postural control as evidenced by lower area and standard deviation of center-of-pressure in DT conditions. As for SampEn and the wavelet analysis, greater values and a shift from vision to the cerebellum contribution were demonstrated in DT conditions. For the DNS task, a trend toward significantly lower right hemisphere PFC activation compared to left hemisphere activation in DT was evidenced, which potentially reiterate the presence of automaticity. Therefore, as demonstrated by this experiment, the simultaneous performance of a difficult cognitive task and posture yields automatic postural behaviour, and provides insight into the neural correlates of automaticity.
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Ferreira, Elisabeth Sofia Borges. "Assessment of hemodynamic parameters." Master's thesis, 2008. http://hdl.handle.net/10316/9930.

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Nos últimos anos, diversos estudos realizados apontam a rigidez arterial como a maior causa de risco cardiovascular. Este parâmetro hemodinâmico tem sido amplamente investigado, aparecendo normalmente associado ao aumento da pressão arterial e ao envelhecimento. A medição da velocidade da onda de pulso, VOP, é considerada o método padrão para avaliar a rigidez arterial. Actualmente, apesar de este ser bem aceite pela comunidade médica/científica, os equipamentos que se encontram disponíveis no mercado são bastante onerosos e difíceis de operar, mesmo por profissionais da área. Pelas razões apontadas, é difícil encontrar estes aparelhos em consultórios médicos e em unidades clínicas/hospitalares. Foi esta a problemática que motivou o estudo de novos métodos para a determinação da rigidez arterial, bem como de outros parâmetros hemodinâmicos associados a esta, como é o caso do índice de aumentação, AIx, índice braço-pé, IBP, entre outros. Este trabalho centrou-se no desenvolvimento de novas perspectivas de utilização para sensores piezoeléctricos, com circuitos de acondicionamento de sinal e testes relacionados, assim como no desenvolvimento de uma ferramenta informática de análise. Foram também realizados testes em humanos, apenas com o objectivo de demonstrar que os resultados são consistentes e reprodutíveis. Questões relacionadas com a aquisição e processamento de sinal, que futuramente serão descritas, foram igualmente levantadas e analisadas durante o trabalho. Em adiantamento, pode-se afirmar que, em primeiro, o módulo NI USB 6210© demonstrou ser uma boa opção e, por último, que o uso do programa MatLab® providenciou um ambiente de análise ideal, assim como as curtas rotinas desenvolvidas e requeridas para um ano de projecto.
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Lopes, Tânia Maria Pereira. "Methodologies for hemodynamic parameters assessment." Master's thesis, 2009. http://hdl.handle.net/10316/11365.

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No mundo actual, há uma enorme preocupação em desenvolver e explorar métodos capazes de detectar parâmetros fisiológicos que indiciem riscos ou problemas de saúde. No caso das doenças cardiovasculares, principal causa de morte nos países desenvolvidos, a rigidez arterial é o principal factor de risco. A velocidade de onda de pulso (VOP), ou seja, a velocidade com que a onda de pressão se propaga ao longo de uma artéria, é considerada o método padrão para avaliar a rigidez arterial. Os equipamentos que se encontram disponíveis no mercado são muito dispendiosos, difíceis de operar e com limitações. Este projecto de investigação centrouse no desenvolvimento de novas sondas, baseadas em sensores piezoeléctricos, capazes de permitir o acesso a diferentes parâmetros hemodinâmicos de forma simples e nãoinvasiva, em especial a sonda dupla, cujo grande potencial seria o cálculo da VOP. Foram construídas duas bancadas de teste que reproduzem as propriedades do sistema cardiovascular, e que permitiram a caracterização dos sensores e validação dos algoritmos desenvolvidos. As sondas criadas permitem obter a onda de pressão original através do algoritmo de Desconvolução. Para a sonda dupla, demonstrouse que esta tem resolução temporal para os estudos da VOP. O presente trabalho pretende descrever aspectos ligados à arquitectura das sondas, as diferentes versões exploradas, os algoritmos criados e os resultados obtidos.
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Almeida, Vânia Maria Gomes de. "Hemodynamic parameters assessment: an improvement of methodologies." Master's thesis, 2009. http://hdl.handle.net/10316/11364.

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A associação entre a rigidez arterial e as doenças cardiovasculares é um importante tópico de investigação com vista ao conhecimento da condição hemodinâmica dos pacientes. Vários índices podem ser um indicador da rigidez arterial, a velocidade da onda de pulso (VOP) e o índice de aumentação, são dois exemplos. Outros tópicos relacionados com as ondas reflectidas são um poderoso indicador neste contexto. Nesta tese são usados sensores piezoeléctricos para registar a forma da onda de pressão e algoritmos capazes de fornecer informação acerca de certos parâmetros hemodinâmicos, em alternativa aos dispositivos disponíveis no mercado. A principal motivação para procurar uma alternativa a estes dispositivos relaciona-se com o preço a que estes estão disponíveis. O desenvolvimento de uma bancada de teste capaz de simular as principais características da dinâmica do sistema arterial constitui uma poderosa ferramenta com vista ao desenvolvimento de sondas e validação dos algoritmos usados para a extracção de informação clinicamente relevante. O índice de aumentação foi o principal parâmetro estudado, este foi avaliado por um novo algoritmo baseado na transformada de wavelet, em comparação com outros referenciados na literatura. O seu desempenho foi testado em pulsos a partir de uma simulação realista baseadas em exponenciais, bem como em dados experimentais obtidos em testes “clínicos” com alguns voluntários.
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Borges, Pâmela Cristina Carvalho. "Development of a new electromechanical probe for hemodynamic parameters assessment." Master's thesis, 2014. http://hdl.handle.net/10316/28097.

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Dissertação de Mestrado em Engenharia Biomédica apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra.
As doenças cardiovasculares (DCVs) causam milhões de mortes todos os anos, sendo a principal causa de morte no mundo inteiro. A hipertensão é um dos mais relevantes factores de risco das doenças cardiovasculares. Assim sendo, é muito importante o desenvolvimento de um método de diagnóstico que seja barato, fácil utilização, preciso e capaz de detectar alterações precoces da performance do sistema cardiovascular, permitindo, desta forma, aumentar a probabilidade de sobrevivência. A análise da forma de onda da pressão sanguínea central fornece informações clínicas relevantes uma vez que patologias cardiovasculares alteram a sua forma de onda. Este projecto de investigação foca-se no desenvolvimento de um novo sensor hemodinâmico não-invasivo que integra um sensor piezoeléctrico e um acelerómetro ligados a um circuito demodulador. O sensor acessa a forma de onda da pressão sanguínea, simulada através das bancadas de teste desenvolvidas ao longo deste projecto. Numa fase inicial, os sinais resultantes são adquiridos recorrendo á utilização dos módulos de aquisição USB NI-6008 ou USB NI-6210 associado a um gerador arbitrário de formas de onda (Agilent), a uma fonte de alimentação e a um computador. Numa fase posterior foi utilizado um dispositivo multifuncional capaz gerar, guardar, converter, medir e analisar sinais analógicos e digitais (Digilent) e um computador. Algoritmos capazes de processar os sinais foram desenvolvidos utilizando o Matlab. Os resultados das avaliações da performance do sistema são apresentados ao longo da dissertação, incluindo os testes de validação efectuados nas bancadas de teste e a descrição da metodologia aplicada à análise dos sinais recolhidos. Testes experimentais provaram a eficiência da caixa de aquisição e da última versão da bancada de teste, permitindo adquirir, com precisão, sinais referentes à pressão arterial e à sua forma de onda. Palavras-Chave Doenças Cardiovasculares, Hipertensão, Forma de onda da pressão sanguínea da Carótida, Sensor Piezoeléctrico, Acelerómetro, Modulação, Desmodulação.
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Books on the topic "Hemodynamic sensor"

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Maquet, Pierre, and Julien Fanielle. Neuroimaging in normal sleep and sleep disorders. Edited by Sudhansu Chokroverty, Luigi Ferini-Strambi, and Christopher Kennard. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199682003.003.0011.

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Functional neuroimaging techniques include methods that probe various aspects of brain function and help derive models of brain organization in health and disease. These techniques can be grouped in two categories. Some are mainly based on electromagnetic signals (electroencephalography, magnetoencephalography), recording brain activity using a large number of sensors with exquisite temporal resolution (usually of the order of a kilohertz) but allowing only indirect characterization of three-dimensional brain activity by resorting to mathematical models. The second type includes different techniques (PET scan, SPECT, MRI, optical imaging) that typically assess metabolic or hemodynamic parameters, with millimeter spatial resolution and usually from the entire brain volume. However, temporal resolution is usually low because it is primarily driven by metabolic processes that unfold in several seconds or minutes. This chapter focuses on this second type, covering the contribution of brain imaging to understanding NREM sleep and REM sleep and also sleep disorders.
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Book chapters on the topic "Hemodynamic sensor"

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Hayes, David L., Samuel J. Asirvatham, and Paul A. Friedman. "Sensor Technology for Rate-Adaptive Pacing and Hemodynamic Optimization." In Cardiac Pacing, Defibrillation and Resynchronization, 407–26. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781118483923.ch9.

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Michard, Frederic. "New Methods and Sensors for Hemodynamic Monitoring." In Advanced Hemodynamic Monitoring: Basics and New Horizons, 267–74. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71752-0_27.

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Chirife, R., M. C. Tentori, H. Mazzetti, and D. Dasso. "Hemodynamic Sensors: Are They All the Same?" In Cardiac Arrhythmias 2001, 566–75. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2103-7_88.

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Benditt, D. G. "Hemodynamic Sensors: Clinical Value in Vasovagal Syncope." In Cardiac Arrhythmias 2001, 602–7. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2103-7_92.

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Occhetta, E., A. Magnani, M. Bortnik, G. Francalacci, F. Di Gregorio, and C. Vassanelli. "Hemodynamic Sensors: Their Impact in Clinical Practice." In Cardiac Arrhythmias 2003, 713–18. Milano: Springer Milan, 2004. http://dx.doi.org/10.1007/978-88-470-2137-2_94.

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Gasparini, G., A. Curnis, M. Gulizia, E. Occhetta, A. Corrado, G. Mascioli, L. Bontempi, et al. "Can Hemodynamic Sensors Ensure Physiological Rate Control?" In Cardiac Arrhythmias 2003, 725–31. Milano: Springer Milan, 2004. http://dx.doi.org/10.1007/978-88-470-2137-2_96.

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Gasparini, M., A. Curnis, M. Mantica, G. Mascioli, P. Galimberti, F. Bianchetti, F. Coltorti, L. Bontempi, A. Barbetta, and F. Di Gregorio. "Hemodynamic Sensors: What Clinical Value Do They Have in Heart Failure?" In Cardiac Arrhythmias 2001, 576–85. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2103-7_89.

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Occhetta, E., M. Bortnik, G. Francalacci, C. Pedrigi, B. Marenna, and C. Vassanelli. "How Reliable and Effective Are Hemodynamic Sensors in Correcting Chronotropic Incompetence?" In Cardiac Arrhythmias 2001, 586–94. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2103-7_90.

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Bongiorni, M. G., E. Soldati, G. Arena, F. Di Gregorio, A. Barbetta, and M. Mariani. "Hemodynamic Sensors: What Clinical Value Do They Have in Chronotropic Incompetence?" In Cardiac Arrhythmias 2001, 595–601. Milano: Springer Milan, 2002. http://dx.doi.org/10.1007/978-88-470-2103-7_91.

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Mujumdar, Radhika, Mancheung Cheung, Shweta Pramod Kadam, and Anirban Dutta. "Wearable Sensor for Multi-wavelength Near-Infrared Spectroscopy of Skin Hemodynamics Along with Underlying Muscle Electromyography." In Biosystems & Biorobotics, 413–18. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70316-5_66.

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Conference papers on the topic "Hemodynamic sensor"

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Øyri, Karl, Stig Støa, and Erik Fosse. "A biomedical wireless sensor network for hemodynamic monitoring." In the Fifth International Conference. New York, New York, USA: ACM Press, 2010. http://dx.doi.org/10.1145/2221924.2221958.

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Sasagawa, Kiyotaka, Takahiro Yamaguchi, Makito Haruta, Yasumi Ohta, Hiroaki Takehara, Toshihiko Noda, Takashi Tokuda, and Jun Ohta. "Hemodynamic imaging using an implantable self-reset image sensor." In 2016 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE, 2016. http://dx.doi.org/10.1109/biocas.2016.7833829.

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Dogan, O., N. Schierbaum, J. Weidenmuller, M. Baum, T. Schroder, D. Wunsch, M. Gortz, and K. Seidl. "Miniaturized Multi Sensor Implant for Monitoring of Hemodynamic Parameters*." In 2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2019. http://dx.doi.org/10.1109/embc.2019.8856571.

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Timm, U., S. Andruschenko, M. Hinz, S. Koball, G. Leen, E. Lewis, J. Kraitl, and H. Ewald. "Optical sensor system for continuous non-invasive hemodynamic monitoring in real-time." In 2011 IEEE Sensors Applications Symposium (SAS). IEEE, 2011. http://dx.doi.org/10.1109/sas.2011.5739781.

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Roy, Dibyendu, Oishee Mazumder, Sundeep Khandelwal, and Aniruddha Sinha. "Wearable sensor driven Cardiac model to derive hemodynamic insights during exercise." In MobiSys '21: The 19th Annual International Conference on Mobile Systems, Applications, and Services. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3469260.3469670.

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Yang, Boo-Ho, Yi Zhang, and Haruhiko H. Asada. "Sensor Fusion for Noninvasive Continuous Monitoring of Pulsating Blood Pressure Based on an Arterial Hemodynamic Model." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0082.

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Abstract This paper presents a new approach to noninvasive, continuous monitoring of arterial blood pressure for advanced cardiovascular diagnoses. Most of the current noninvasive, continuous blood pressure measurement devices are mechanically intrusive and, therefore, cannot be used for long-term ambulatory monitoring. This new approach requires only simple, noninvasive monitoring devices such as finger photo plethysmographs and an electrical impedance plethysmograph (EIP) to monitor the dynamic behavior of the arterial blood flow. In this approach, measured signals from these noninvasive sensors on an arterial segment are integrated to estimate the blood pressure based on a hemodynamic model using a Kalman filter. It is shown that the internal variables such as the arterial blood pressure of the arterial segment can be estimated based on the measurements even though the observability condition of the system may not be met. Simulation results indicate that the approach can generate an accurate estimation of the arterial blood pressure in real-time even from noisy sensor signals.
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Leitao, C., H. Lima, J. Lemos Pinto, L. Bilro, P. Antunes, C. Marques, J. Prata, P. Andre, and R. Nogueira. "Development and characterization of new sensors for hemodynamic evaluation: Fibre Bragg sensor for arterial pulse waveform acquisition." In 2012 IEEE 2nd Portuguese Meeting in Bioengineering (ENBENG). IEEE, 2012. http://dx.doi.org/10.1109/enbeng.2012.6331343.

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Chen, Yanfei, Brian T. Jankowitz, Sung Kwon Cho, and Youngjae Chun. "A novel low profile wireless flow sensor to monitor hemodynamic changes in cerebral aneurysm." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Tribikram Kundu. SPIE, 2015. http://dx.doi.org/10.1117/12.2084250.

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Ibrahim, Bassem, Dariusz Mrugala, and Roozbeh Jafari. "Effects of Bio-Impedance Sensor Placement Relative to the Arterial Sites for Capturing Hemodynamic Parameters." In 2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC). IEEE, 2019. http://dx.doi.org/10.1109/embc.2019.8857585.

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Mascaro, Stephen, and H. Harry Asada. "Distributed Photo-Plethysmograph Fingernail Sensors: Finger Force Measurement Without Haptic Obstruction." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0010.

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Abstract Improvement on a new type of touch sensor for detecting contact pressure at human fingertips is presented. A fingernail is instrumented with spatially distributed arrays of miniature LEDs and photodetectors in order to measure changes in the nail color pattern when the fingertip is pressed against a surface. Unlike traditional electronic gloves, in which sensor pads are placed between the fingers and the environment surface, this new sensor allows the fingers to directly contact the environment without obstructing the human’s natural haptic senses. The finger touch force is detected by measuring changes in the nail color, hence the sensor is mounted on the fingernail rather than on the fingertip. Photo-reflective plethysmography is used to measure the pattern of nail color — i.e. the blood content under the fingernail. Hemodynamic modeling is used to investigate the dynamics of the change in blood volume at multiple locations under the fingernail. The model is simulated and then evaluated by comparison with the experimental dynamic response of the sensor.
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