Relevant bibliographies by topics / QRSd

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  2. Dissertations / Theses
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  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'QRSd'

Author: Grafiati
Published: 28 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "QRSd"

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Nakai, Toshiko, Hiroaki Mano, Yukitoshi Ikeya, Yoshihiro Aizawa, Sayaka Kurokawa, Kimie Ohkubo, Koichi Nagashima, Ichiro Watanabe, and Yasuo Okumura. "Narrower QRS may be enough to respond to cardiac resynchronization therapy in lightweight patients." Heart and Vessels 35, no. 6 (November 27, 2019): 835–41. http://dx.doi.org/10.1007/s00380-019-01541-8.

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AbstractA prolonged QRS duration (QRSd) is promising for a response to cardiac resynchronization therapy (CRT). The variation in human body sizes may affect the QRSd. We hypothesized that conduction disturbances may exist in Japanese even with a narrow (< 130 ms)-QRS complex; such patients could be CRT candidates. We investigated the relationships between QRSd and sex and body size in Japanese. We retrospectively analyzed the values of 338 patients without heart failure (HF) (controls) and 199 CRT patients: 12-lead electrocardiographically determined QRSd, left ventricular diastolic and systolic diameters (LVDd and LVDs), body surface area (BSA), body mass index (BMI), and LVEF. We investigated the relationships between the QRSd and BSA, BMI, and LVD. The men’s and women’s BSA values were 1.74 m2 and 1.48 m2 in the controls (p < 0.0001), and 1.70 m2 and 1.41 m2 in the CRT patients (p < 0.0001). The men’s and women’s QRSd values were 96.1 ms and 87.4 ms in the controls (p < 0.0001), and 147.8 ms and 143.9 ms in the CRT group (p = 0.4633). In the controls, all body size and LVD variables were positively associated with QRSd. The CRT response rate did not differ significantly among narrow-, mid-, and wide-QRS groups (83.6%, 91.3%, 92.4%). An analysis of the ROC curve provided a QRS cutoff value of 114 ms for CRT responder. The QRSd appears to depend somewhat on body size in patients without HF. The CRT response rate was better than reported values even in patients with a narrow QRSd (< 130 ms). When patients are considered for CRT, a QRSd > 130 ms may not be necessary, and the current JCS guidelines appear to be appropriate.
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Odland, Hans Henrik, Torbjørn Holm, Lars Ove Gammelsrud, Richard Cornelussen, and Erik Kongsgaard. "Determinants of LV dP/dtmax and QRS duration with different fusion strategies in cardiac resynchronisation therapy." Open Heart 8, no. 1 (May 2021): e001615. http://dx.doi.org/10.1136/openhrt-2021-001615.

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BackgroundWe designed this study to assess the acute effects of different fusion strategies and left ventricular (LV) pre-excitation/post-excitation on LV dP/dtmax and QRS duration (QRSd).MethodsWe measured LV dP/dtmax and QRSd in 19 patients having cardiac resynchronisation therapy (CRT). Two groups of biventricular pacing were compared: pacing the left ventricle (LV) with FUSION with intrinsic right ventricle (RV) activation (FUSION), and pacing the LV and RV with NO FUSION with intrinsic RV activation. In the NO FUSION group, the RV was paced before the expected QRS onset. A quadripolar LV lead enabled distal, proximal and multipoint pacing (MPP). The LV was stimulated relative in time to either RV pace or QRS-onset in four pre-excitation/post-excitation classes (PCs). We analysed the interactions of two groups (FUSION/NO FUSION) with three different electrode configurations, each paced with four different degrees of LV pre-excitation (PC1–4) in a statistical model.ResultsLV dP/dtmax was higher with NO FUSION than with FUSION (769±46 mm Hg/s vs 746±46 mm Hg/s, p<0.01), while there was no difference in QRSd (NO FUSION 156±2 ms and FUSION 155±2 ms). LV dP/dtmax and QRSd increased with LV pre-excitation compared with pacing timed to QRS/RV pace-onset regardless of electrode configuration. Overall, pacing LV close to QRS-onset (FUSION) with MPP shortened QRSd the most, while LV dP/dtmax increased the most with LV pre-excitation.ConclusionWe show how a beneficial change in QRSd dissociates from the haemodynamic change in LV dP/dtmax with different biventricular pacing strategies. In this study, LV pre-excitation was the main determinant of LV dP/dtmax, while QRSd shortens with optimal resynchronisation.
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Karaca, Oguz. "Prognostic Implications of ‘Paced’ and ‘Native’ QRS Durations Following Cardiac Resynchronization Therapy." European Journal of Arrhythmia & Electrophysiology 02, no. 01 (2016): 30. http://dx.doi.org/10.17925/ejae.2016.02.01.30.

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Current evidence strongly suggests that the extent of electrical dyssynchrony within the left ventricle is determined by the delayed intraventricular conduction time reflected by a prolonged QRS duration (QRSd) on the surface (ECG). However, in cardiac resynchronization therapy (CRT) follow-up algorithms, the QRSd on the post-operative ECG has been relatively less frequently addressed, although the baseline QRSd is accepted as an essential ‘pre-operative’ marker for patient selection and prediction of response to therapy. In this review, we discuss the clinical impact of post-implantation electrocardiographic parameters, such as the ‘paced’ QRSd and ‘native’ QRSd (assessed when the device is temporarily switched off) on the efficacy of therapy and on prediction of future outcomes after CRT.
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Kwon, Hee-Jin, Kyoung-Min Park, Seong Soo Lee, Young Jun Park, Young Keun On, June Soo Kim, and Seung-Jung Park. "Electrical Reverse Remodeling of the Native Cardiac Conduction System after Cardiac Resynchronization Therapy." Journal of Clinical Medicine 9, no. 7 (July 8, 2020): 2152. http://dx.doi.org/10.3390/jcm9072152.

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Background: Little is known about electrical remodeling of the native conduction systems, particularly how the PR interval changes, after cardiac resynchronization therapy (CRT). We investigated the effects of CRT on the intrinsic PR interval (i-PRi) and QRS duration (i-QRSd). Methods and results: In 100 consecutive CRT recipients with sinus rhythm and long-term follow-up (>1 year), the i-PRi and i-QRSd were measured at baseline and at the last echocardiographic follow-up (33.4 ± 17.9 months) with biventricular pacing temporarily withdrawn. The relative decrease in the left ventricular end-systolic volume (LVESV) was measured to define CRT-responders (≥15%) and super-responders (≥30%). Following CRT, the left ventricular (LV) ejection fraction increased significantly (p < 0.001). In CRT-responders (n = 71), the LVESV and i-QRSd decreased markedly (170 ± 39 to 159 ± 24 ms, p = 0.012). However, the i-PRi was not shortened with CRT response and was actually likely to increase, even in the super-responder group (n = 33). Moreover, lengthening of the i-PRi was observed consistently irrespective of the CRT response status, beta-blocker use, or amiodarone use. CRT non-responders were associated with a remarkable PR prolongation (p = 0.005) and QRS widening (p = 0.001), along with positive ventricular remodeling. Conclusion: LV volume and i-QRSd decreased markedly with CRT response. However, the i-PRi was not shortened, but rather increased regardless of the degree of CRT response. CRT non-response was associated with a considerable increase in the i-PRi and i-QRSd, along with positive ventricular remodeling. CRT-induced electrical reverse remodeling might occur preferentially in the intraventricular, but not the atrioventricular, conduction system.
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Rehman Mir, Naeem-ur, Naeem Asghar, and Shaukat Javed. "HEART FAILURE;." Professional Medical Journal 24, no. 06 (June 5, 2017): 912–18. http://dx.doi.org/10.29309/tpmj/2017.24.06.1198.

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Introduction: Atrial fibrillation (AF) and wider QRS duration have long beenidentified to worsen heart failure and LV dysfunction and increase cardiovascular morbidityand mortality. Therefore, it is necessary to identify those patients of heart failure who are atgreater risk for cardiovascular morbidity and mortality so that such subjects may be focusedfor preventive strategies. An association exists between QRS duration and AF with greaterincidences of cardiovascular events in patients of heart failure with LV systolic dysfunction.Study Design: Cross sectional survey. Setting: Department of Cardiology, Punjab Institute ofCardiology Lahore. Period: 16-02-2015 to 15-08-2015. Material and Methods: The objectiveof study was to determine the Frequency of QRS Duration groups and Atrial Fibrillation inPatients with Left Ventricular Dysfunction. Sample size of 400 cases was calculated with 95%confidence level, 4% margin of error and taking expected percentage of atrial fibrillation innarrow QRS group i.e. 20.9% (least among all) in patients with left ventricular dysfunction.Sampling technique was non-probability, purposive sampling. Result: The study populationconsisted of male (72.3%) and female (27.7%). Mean LA diameter was 40.3±6.08 mm andmean LV ejection fraction 31.8±6.6 % in the study population. Ischemic heart disease wasthe most common cause of LV dysfunction (88.3%) followed by non-ischemic cardiomyopathy(8.75%) and non-Ischemic valvular heart disease (3.5%). The frequency of Narrow QRSd (<120ms) was 62%, Intermediate QRSd (120-150 ms) was 26.5% and Wide QRSd (>150 ms) was11.5%. The frequency of atrial fibrillation in study population was 15.75%. The frequency of atrialfibrillation was highest in Wide QRSd group (>150 ms) i.e. (60.9%), followed by IntermediateQRSd group (120-150 ms) i.e. (18.9%) and narrow QRSd group (<120 ms) i.e. (6.04%). Patientwith atrial fibrillation were more likely to have poor ejection fraction (P<0.0023) and wider QRSduration (P<0.0001). Frequency of atrial fibrillation was highest in Valvular Cardiomyopathy(non-ischemic valvular heart disease) patients (42.8%) as compared to coronary artery diseasegroup (15.3%) and non-ischemic cardimyopathy group (9.4%). Conclusion: In patients of heartfailure with reduced ejection fraction (HFrEF), the frequency of atrial fibrillation increases asQRS duration widens. This group of patients must be focused for AF preventive strategies.
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Waddingham, Peter H., Pier Lambiase, Amal Muthumala, Edward Rowland, and Anthony WC Chow. "Fusion Pacing with Biventricular, Left Ventricular-only and Multipoint Pacing in Cardiac Resynchronisation Therapy: Latest Evidence and Strategies for Use." Arrhythmia & Electrophysiology Review 10, no. 2 (July 13, 2021): 91–100. http://dx.doi.org/10.15420/aer.2020.49.

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Despite advances in the field of cardiac resynchronisation therapy (CRT), response rates and durability of therapy remain relatively static. Optimising device timing intervals may be the most common modifiable factor influencing CRT efficacy after implantation. This review addresses the concept of fusion pacing as a method for improving patient outcomes with CRT. Fusion pacing describes the delivery of CRT pacing with a programming strategy to preserve intrinsic atrioventricular (AV) conduction and ventricular activation via the right bundle branch. Several methods have been assessed to achieve fusion pacing. QRS complex duration (QRSd) shortening with CRT is associated with improved clinical response. Dynamic algorithm-based optimisation targeting narrowest QRSd in patients with intact AV conduction has shown promise in people with heart failure with left bundle branch block. Individualised dynamic programming achieving fusion may achieve the greatest magnitude of electrical synchrony, measured by QRSd narrowing.
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Uebing, Anselm, Derek G. Gibson, Sonya V. Babu-Narayan, Gerhard P. Diller, Konstantinos Dimopoulos, Omer Goktekin, Mark S. Spence, et al. "Right Ventricular Mechanics and QRS Duration in Patients With Repaired Tetralogy of Fallot." Circulation 116, no. 14 (October 2, 2007): 1532–39. http://dx.doi.org/10.1161/circulationaha.107.688770.

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Background— Patients after repair of tetralogy of Fallot (ToF) frequently have right ventricular (RV) dysfunction and prolonged QRS duration (QRSd) and thus could be candidates for cardiac resynchronization therapy. We aimed to assess the relationship between QRSd and the timing of RV wall motion, including the RV outflow tract (RVOT), in these patients. Methods and Results— Sixty-seven repaired ToF patients (median age, 34 years; interquartile range, 24 to 43 years) and 35 age-matched control subjects were studied by echocardiography and cardiovascular magnetic resonance (n=55 of 67 ToF patients). Time intervals of the RV cardiac cycle were measured from Doppler recordings. Long-axis M-mode recordings were acquired from the right ventricular (RV) free wall and RV outflow tract (RVOT), and the delay in onset of long-axis shortening was measured. ToF patients showed minor abnormalities of the RV cardiac cycle unrelated to QRSd. RV ejection time was prolonged and correspondingly filling time was reduced compared with control subjects (22.3±2.6 versus 20.0±2.9 s/min, P <0.0001; 29.0±3.8 versus 32.7±3.5 s/min, P <0.0001). Total isovolumic time was normal in ToF patients (8.7±4.0 versus 7.4±2.9 s/min; P =NS). QRSd correlated with the delay in RV free wall motion ( r =0.55, P <0.0001) and more so with the delay in RVOT shortening ( r =0.82, P <0.0001). QRSd also correlated with measures of RVOT abnormality such as long-axis RVOT excursion and akinetic area length ( r =−0.46, P =0.004; r =0.33, P =0.01). Conclusions— QRSd in postoperative ToF patients reflects mainly abnormalities of the RVOT rather than the RV body itself. Thus, prevention and treatment of mechanical asynchrony and malignant arrhythmia should focus on the RV infundibulum. Indications for cardiac resynchronization therapy after ToF repair warrant further investigation.
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Tse, Gary, and Bryan P. Yan. "Novel arrhythmic risk markers incorporating QRS dispersion: QRSd × (T peak − T end )/QRS and QRSd × (T peak − T end )/(QT × QRS)." Annals of Noninvasive Electrocardiology 22, no. 6 (August 18, 2016): e12397. http://dx.doi.org/10.1111/anec.12397.

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Carvalho, Elizabeth Regina, Evandro Zacché, Michelli Fenerich, Aparecido Antônio Camacho, Julio P. Santos, and Marlos G. Sousa. "Electrocardiographic markers of myocardial conduction and repolarization in Boxer dogs." Pesquisa Veterinária Brasileira 40, no. 8 (August 2020): 630–36. http://dx.doi.org/10.1590/1678-5150-pvb-6265.

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ABSTRACT: Electrocardiographic markers have been used in people to classify arrhythmogenic risk. The aims of this study were to investigate electrocardiographic markers of conduction and repolarization in Boxers and non-Boxer dogs, and compare such findings between groups. Ten-lead standard electrocardiograms of Boxer dogs and non-Boxers recorded from 2015 to 2018 were retrospectively reviewed. Dogs ≥4 years of age and weighing >20kg were included. Animals with valvular insufficiencies, congenital cardiopathies, cardiac dilation, suspected systolic dysfunction, biphasic T-wave, bundle branch blocks, and those receiving antiarrhythmics were excluded. Electrocardiographic markers of conduction, QRS duration (QRSd) and dispersion (QRSD), and repolarization (corrected QT interval, Tpeak-Tend, JT and JTpeak), as well as derived indices, were measured. Two hundred dogs met the inclusion/exclusion requirements, including 97 Boxers (8.1±2.5 years old; 30±7kg) and 103 non-Boxer (8.8±2.5 years old, 30±8kg). QRSd and QRSD, and repolarization markers in lead II and left precordial lead V4 were considered similar between groups. Dispersion of late repolarization on lead rV2, Tpeak-Tend interval, was considered longer in Boxers (45±8ms vs 38±10ms, P=0.01). The Tpeak-Tend/JTpeak and the JTpeak/JT also differed between groups. Our results indicate that the dispersion of myocardial late repolarization in lead rV2 is slower in Boxers than other dog breeds.
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Harb, Serge C., Saleem Toro, Jennifer A. Bullen, Nancy A. Obuchowski, Bo Xu, Kevin M. Trulock, Niraj Varma, et al. "Scar burden is an independent and incremental predictor of cardiac resynchronisation therapy response." Open Heart 6, no. 2 (July 2019): e001067. http://dx.doi.org/10.1136/openhrt-2019-001067.

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ObjectiveDetermine the prognostic impact of scar quantification (scar %) by cardiac magnetic resonance (CMR) in predicting heart failure admission, death and left ventricular (LV) function improvement following cardiac resynchronisation therapy (CRT), after controlling for the presence of left bundle branch block (LBBB), QRS duration (QRSd) and LV lead tip location and polarity.MethodsConsecutive patients who underwent CMR between 2002 and 2014 followed by CRT were included. The primary endpoint was death or heart failure admission. The secondary endpoint was change in ejection fraction (EF) ≥3 months after CRT. Cox proportional hazards, linear regression models and change in the area under the receiver operating characteristic curve (AUC) were used.ResultsA total of 84 patients were included (63% male, 51% with ischaemic cardiomyopathy). After adjusting for clinical factors, presence of LBBB and QRSd and LV lead tip location and polarity, greater scar % remained associated with a higher risk for clinical events (HR=1.06; 95% CI 1.02 to 1.10; p<0.001) and a smaller improvement in EF (slope: −0.61%; 95% CI −0.93% to 0.29%; p<0.001). When adding scar % to QRSd and LBBB, there was significant improvement in predicting clinical events at 3 years (AUC increased to 0.831 from 0.638; p=0.027) and EF increase ≥10% (AUC 0.869 from 0.662; p=0.007).ConclusionScar quantification by CMR has an incremental value in predicting response to CRT, in terms of heart failure admission, death and EF improvement, independent of the presence of LBBB, QRSd, LV lead tip location and polarity.
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Dissertations / Theses on the topic "QRSd"

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Malina, Ondřej. "Detekce začátku a konce komplexu QRS s využitím hlubokého učení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442595.

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This thesis deals with the issue of automatic measurement of the duration of QRS complexes in ECG signals. Special emphasis is then placed on the possibility of automatic detection of QRS complexes while exciting cardiac tissue with a pacemaker. The content of this work is divided into four logical units, where the first part deals with the heart as an organ. It describes the origin and spread of excitement in the heart, its possible pathologies and their manifestations in ECG recording, it also deals with pacing and measuring ECG recording during simultaneous pacing. The second part of the thesis contains a brief introduction to the topic of machine and deep learning. The third part of the thesis contains a search of current approaches using methods based on deep learning to solve the detection of QRSd. The fourth part deals with the design and implementation of its own model of deep learning, able to detect the beginnings and ends of QRS complexes from ECG recordings. It describes the data preprocessing implemented in the MATLAB programming environment. The actual implementation of the model was performed in the Python using the PyTorch and NumPy moduls.
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Farber, Dawn L. (Dawn Lee). "Multi-channel QRS detector." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10868.

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Hanna, Rafik. "VALIDATION OF QUICKSCAT RADIOMETER (QRAD) MICROWAVE BRIGHTNESS TEMPERTURE MEASURMENTS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3990.

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After the launch of NASA's SeaWinds scatterometer in 1999, a radiometer function was implemented in the Science Ground Data Processing Systems to allow the measurement of the earth's microwave brightness temperature. This dissertation presents results of a comprehensive validation to assess the quality of QRad brightness temperature measurements using near-simultaneous ocean Tb comparisons between the SeaWinds on QuikSCAT (QRad) and WindSat polarimetric radiometer on Coriolis. WindSat was selected because it is a well calibrated radiometer that has many suitable collocations with QuikSCAT; and it has a 10.7 GHz channel, which is close to QRad frequency of 13.4 GHz. Brightness temperature normalizations were made for WindSat before comparison to account for expected differences in Tb with QRad because of incidence angle and channel frequency differences. Brightness temperatures for nine months during 2005 and 2006 were spatially collocated for rain-free homogeneous ocean scenes (match-ups) within 1° latitude x longitude boxes and within a ± 60 minute window. To ensure high quality comparison, these collocations were quality controlled and edited to remove non-homogenous ocean scenes and/or transient environmental conditions, including rain contamination. WindSat and QRad Tb's were averaged within 1° boxes and these were used for the radiometric inter-calibration analysis on a monthly basis. Results show that QRad calibrations are stable in the mean within ± 2K over the yearly seasonal cycle.
Ph.D.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering PhD
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Kuna, Zdeněk. "Detekce komplexů QRS v signálech EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218655.

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This project considers methods of construction QRS detectors. It focus in detection complexes of QRS single leads and space speed, which are calculated from three orthogonal leads. In theory was refer to various methods, which lead to design detector. It were designed two algoritms (constant and adaptive detecting threshold), which were implemented into detector and the signal was preprocessed by Hilbert transformation. Toward algoritms were completed by modification, which improved detection effectivity. Function of algoritms were tested in all signals of CSE (V2,V5,aVF).
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Zedníček, Vlastimil. "Detekce QRS založená na vlnkové transformaci." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220878.

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This thesis deals with implementation of detector QRS complex with use of wavelet transform. The first part is focused on formation and possibility to measure cardiac activity. The other part of thesis we will familiarise with the different possibilities of detection QRS complex and we intimately focus on wavelet transform that will be used for a project of detection QRS complex. The practical part of thesis focuses on the project of detector in programming language Matlab and his different setting. This projected detector has been tested with CSE database. Achieved results of projected detector are evaluated with the results of others authors.
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Zhorný, Lukáš. "Detekce komplexů QRS v signálech EKG." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413175.

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This thesis deals with the detection of QRS complexes from electrocardiograms using time-frequency analysis. Detection procedures are based on wavelet and Stockwell transform. The theoretical part describes the basics of electrocardiography, then introduces common approaches to time-frequency analysis, such as short-time Fourier transform (STFT), wavelet transform and Stockwell transform. These algorithms were tested on a set of electrograms from the MIT-BIH and CSE-MO1 arrhythmia database. For the CSE database worked best the method based on the wavelet transform with the filter bank Symlet4, with the resulting value of sensitivity 100 % and positive predictivity 99.86%. For the MIT database had the best performance the detector using the Stockwell transform with values of sensitivity 99.54% and positive predictivity 99.68%. The results were compared with the values of other authors mentioned in the text.
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Kocian, Ondřej. "Detekce komplexů QRS s využitím vlnkové transformace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217974.

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This project investigates methods of construction the wavelet-based QRS-complex detector. QRS-complex detection is very important, because it helps automatically calculate heart rate and in some cases it is used for compression ECG signal. The design of QRS detector can be made with many methods, in this project were mentioned and consequently tested only a few variants. The principle of designed detector used a wavelet-based decomposition of the original ECG signal to several frequency-coded bands. These bands are consequently transformed to absolute values and with the help of the threshold value are marked positions of assumed QRS complexes. Then are these assumed positions from all bands compared between themselves. If the position is confirmed at least at one nearby band, then is this position marked as true QRS complex. To increase efficiency of designed detector, two modifications were additionally mentioned. The first one, using the envelope of the signal, had rather negative effect on detectors efficiency. The second modification, using combined signal from three pseudoorthogonal leads, had reversely very good effect on detectors efficiency. In the end, the designed detector and all its modifications were tested on signals from CSE library (exactly on leads II, V2 and V6).
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Loviška, David. "Detekce QRS komplexu s využitím vlnkové transformace." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218652.

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The aim of diploma thesis named “QRS detection using wavelet transform” is to simplify and accelerate the work of doctors. This can be achieved by using application for QRS detection, which can use one of four proposed algorithms. Application shows basic informations about inserted electrocardiogram. Part of this program is a graphical window with displayed record and with coloured marks on detected QRS complexes. By another algorythm are marks color-coded due to accurancy percentil of every detected complex. This program is designed for a several hours record from Holter ECG monitoring.
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Hanus, Rostislav. "Detekce QRS založená na počítání průchodů nulou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219638.

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This master’s thesis deals with the detection of QRS complex detection using zero crossing counts. QRS detection is an important part of the analysis of ECG signal. From the point of determining the R wave detection is based on the other waves and intervals necessary for the diagnosis of heart. This method is very effective even for very noisy signals. Implementation of the method in Matlab, and the success of detection is tested on the CSE and MIT-BIH database. The optimization algorithm is an optional value for the detector.
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Hylmar, Petr. "Detekce QRS založená na počítání průchodů nulou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220865.

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This master's thesis describes basics principles of QRS complex detection. It is focused on QRS detection using zero crossing counts method. There are described princips and program realization of this method. The other part is focused on genetic optimalization algorithm. There are presented obtained optimalization results on standard CSE and MIT-BIH database. The quality of the detector is compared with other authors. The optimalized QRS detector achieves comparable results with other authors. The part of the thesis is graphical user interface which supply view on modified ECG signal and detection results.
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Books on the topic "QRSd"

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Billings, Ginny. The Billings rollography: Player piano music from 1917 to 1934. Belmont, CA (1518 Sunnyslope Ave., Belmont 94002): Rock Soup, 1990.

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Quaker Social Responsibility and Education. Dream or nightmare?: The closure of long-stay mental hospitals and community care : a report of a QRSE ad hoc group, October 1989. London: QRSE, 1989.

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Projects at Warp-Speed with QRPD. Global Brain, 1998.

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JR, JOSE APOLINARIO. QRD-RLS Adaptive Filtering. Springer, 2010.

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QRD-RLS Adaptive Filtering. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-09734-3.

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Heidbuchel, Hein, Mattias Duytschaever, and Haran Burri. Narrow versus wide QRS. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198766377.003.0003.

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Heidbuchel, Hein, Mattias Duytschaever, and Haran Burri. Which narrow QRS tachycardia? Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198766377.003.0031.

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Heidbuchel, Hein, Mattias Duytschaever, and Haran Burri. From narrow to wide QRS tachycardia. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198766377.003.0046.

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Heidbuchel, Hein, Mattias Duytschaever, and Haran Burri. An APC during wide-QRS tachycardia. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780198766377.003.0053.

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Dacanay, Lev. 20 Covid-19 Poems: QRST Keys to Get You Through the Pandemic. Independently Published, 2020.

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Book chapters on the topic "QRSd"

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Zeng, Rui, Xiaohan Zhang, Tianyuan Xiong, Guojun Zhou, and Rongzheng Yue. "QRS Complex." In Graphics-sequenced interpretation of ECG, 69–119. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-955-4_4.

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de Campos, Marcello L. R., and Gilbert Strang. "QR Decomposition An Annotated Bibliography." In QRD-RLS Adaptive Filtering, 1–22. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_1.

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Ma, Jun, and Keshab K. Parhi. "On Pipelined Implementations of QRD-RLS Adaptive Filters." In QRD-RLS Adaptive Filtering, 1–29. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_10.

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Werner, Stefan, and Mohammed Mobien. "Weight Extraction of Fast QRD-RLS Algorithms." In QRD-RLS Adaptive Filtering, 1–24. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_11.

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Chern, Shiunn-Jang. "Linear Constrained QRD-Based Algorithm." In QRD-RLS Adaptive Filtering, 1–23. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_12.

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Apolinário, José A., and Sergio L. Netto. "Introduction to Adaptive Filters." In QRD-RLS Adaptive Filtering, 1–27. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_2.

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Apolinário, José A., and Maria D. Miranda. "Conventional and Inverse QRD-RLS Algorithms." In QRD-RLS Adaptive Filtering, 1–35. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_3.

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Apolinário, José A., and Paulo S. R. Diniz. "Fast QRD-RLS Algorithms." In QRD-RLS Adaptive Filtering, 1–27. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_4.

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Yuan, Jenq-Tay. "QRD Least-Squares Lattice Algorithms." In QRD-RLS Adaptive Filtering, 1–31. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_5.

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Ramos, António L. L., and Stefan Werner. "Multichannel Fast QRD-RLS Algorithms." In QRD-RLS Adaptive Filtering, 1–34. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-09734-3_6.

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Conference papers on the topic "QRSd"

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Lemay, M., V. Jacquemet, A. Forclaz, J. M. Vesin, and L. Kappenberger. "Spatiotemporal QRST cancellation method using separate QRS and T-waves templates." In Computers in Cardiology, 2005. IEEE, 2005. http://dx.doi.org/10.1109/cic.2005.1588175.

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KOZMANN, GYÖRGY, and KRISTÓF HARASZTI. "NONINVASIVE ASSESSMENT OF ACTIVATION AND REPOLARIZATION DYNAMICS BY QRS AND QRST INTEGRAL MAPS." In Proceedings of the 31st International Congress on Electrocardiology. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812702234_0162.

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Beckers, F., W. Anne, B. Verheyden, C. van der Dussen de Kestergat, E. Van Herk, L. Janssens, R. Willems, H. Heidbuchel, and A. E. Aubert. "Determination of atrial fibrillation frequency using QRST-cancellation with QRS-scaling in standard electrocardiogram leads." In Computers in Cardiology, 2005. IEEE, 2005. http://dx.doi.org/10.1109/cic.2005.1588106.

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Pabón, P., V. Vicente, I. Alberca, C. Martin Luengo, and A. Lopez Borrasca. "EFFECT OF DDAVP ON MYOCARDIAL INFARCT SIZE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644127.

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Abstract:
Infarct size, estimated by electrocardiographic changes (the QRS Scoring System, developed by Wagner et al, Circulation 65,342, 1982) and enzymatic analysis (creatinine kinase, CK) was studied in 45 patients with no history of previous infarcts. 25 received an intravenous dose of DDAVP (0.3 ug/kg) and 20 received a placebo solution (saline). The time between the onset of symptoms and DDVAP administration was less than 12 hours. The results showed no significant differences between the two groups in maximal or acumulative activity of creatinine kinase (CKr) or the QRS score peak. However, in patients with a mean evolution time of less than 1 hour, the CK peak was significantly lower in the DDAVP group than in the placebo group (p<0.05). Furthermore the percent of maximal increase in the QRS score was lower in the DDAVP group than in the patients receiving the placebo (p=0.1). On admission, the fibrinolytic activity of euglobulin fractions (measured by fibrin plates) was higher in the patients in both groups than in a group of healthy subjects (n=40). Also, DDAVP significantly increased fibrinolyric activity whereas no changes were found in patients receiving the placebo. The mean CKr value was lower in patients with an increase in fibrinolysis than in those who showed no changes in it. Finally, in the DDAVP group the QRS score peak was strongly dependent on the initial QRS score and, regarding this, our results suggest that small infarcts on admission may represent a potential indication for DDAVP therapy.
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Wang, Frank, and Marc Smith. "Vibration Analysis and Control of the Quartz Rate Sensor." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59430.

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BEI Systron Donner’s family of quartz inertial sensors uses a one piece, micromachined inertial sensing element to measure angular velocity. These sensors produce an output signal proportional to the rate of rotation sensed. In this paper, the operation of the quartz rate sensor (QRS) is presented. A mathematical model of the quartz fork is extracted, and the vibration characteristics of the quartz fork are presented. In order to control the magnitude of the drive tines, an AGC/Oscillator (AGC: automatic gain control) loop is employed. The system response is analyzed using Matlab and Pspice. A switched capacitor (SC) circuit is used to realize the functions of full wave rectification (FWR), integration, and summation. The AGC level is controlled to within 0.3%/V dependency on the power supply. This fixes the scale factor of the QRS to the same level of power supply rejection.
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Ələkbərov, Rəşid, and Səməd Dursunov. "Qrid sistemlərində təhlükəsizlik texnologiyalarının analizi." In İnformasiya təhlükəsizliyinin aktual problemləri. Institute of Information Technology of Azerbaijan National Academy of Sciences, 2017. http://dx.doi.org/10.25045/ncinfosec.2017.20.

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Sokolova, Anastasia A., Nikita S. Pyko, Svetlana A. Pyko, Yury D. Uljanitsky, and Olga M. Andreeva. "Analysis of QRS detection algorithms barely sensitive to the QRS shape." In 2017 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus). IEEE, 2017. http://dx.doi.org/10.1109/eiconrus.2017.7910663.

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Amiri, Amir Mohammad, Abhinav, and Kunal Mankodiya. "m-QRS: An efficient QRS detection algorithm for mobile health applications." In 2015 17th International Conference on E-health Networking, Application & Services (HealthCom). IEEE, 2015. http://dx.doi.org/10.1109/healthcom.2015.7454590.

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"QRS 2016 Steering Committee." In 2016 IEEE International Conference on Software Quality, Reliability and Security (QRS). IEEE, 2016. http://dx.doi.org/10.1109/qrs.2016.8.

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"QRS 2016 Organizing Committee." In 2016 IEEE International Conference on Software Quality, Reliability and Security (QRS). IEEE, 2016. http://dx.doi.org/10.1109/qrs.2016.9.

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Reports on the topic "QRSd"

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Fan, Howard. High Speed, Numerically Superior Signal Processing Algorithms Using QRD and Delta Operator. Fort Belvoir, VA: Defense Technical Information Center, October 1997. http://dx.doi.org/10.21236/ada331094.

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Fan, Howard. High Speed, Numerically Superior Signal Processing Algorithms Using QRD & Delta Operator. Fort Belvoir, VA: Defense Technical Information Center, September 1998. http://dx.doi.org/10.21236/ada354817.

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Frantzeskakis, E. N., and J. J. Liu. A Class of Square Root and Division Free Algorithms and Architectures for QRD-Based Adaptive Signal Processing. Fort Belvoir, VA: Defense Technical Information Center, January 1993. http://dx.doi.org/10.21236/ada452710.

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