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Electrocardiography is the process of producing an electrocardiogram,a recording of the heart's electrical activity through repeated cardiac cycles. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart using electrodes placed on the skin. These electrodes detect the small electrical changes that are a consequence of cardiac muscle depolarization followed by repolarization during each cardiac cycle (heartbeat). Changes in the normal ECG pattern occur in numerous cardiac abnormalities,including cardiac rhythm disturbances,inadequate coronary artery blood flow,and electrolyte disturbances.
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The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram. It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the heart and contraction of the large ventricular muscles.
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The Pan–Tompkins algorithm is commonly used to detect QRS complexes in electrocardiographic signals (ECG). The QRS complex represents the ventricular depolarization and the main spike visible in an ECG signal. This feature makes it particularly suitable for measuring heart rate,the first way to assess the heart health state. In the first derivation of Einthoven of a physiological heart,the QRS complex is composed by a downward deflection,a high upward deflection and a final downward deflection.
Konstantina "Nantia" Nikita is a Greek electrical and computer engineer and a professor at the School of Electrical and Computer Engineering at the National Technical University of Athens (NTUA),Greece. She is director of the Mobile Radiocommunications Lab and founder and director of the Biomedical Simulations and Imaging Lab,NTUA. Since 2015,she has been an Irene McCulloch Distinguished Adjunct Professor of Biomedical Engineering and Medicine at Keck School of Medicine and Viterbi School of Engineering,University of Southern California.
May Dongmei Wang is a Chinese-American biomedical engineer whose research involves biomedical big data analytics,the interpretation and application of big data in medicine and biology,as generated from microarrays and quantum dots. She is a professor of biomedical engineering and Wallace H. Coulter Distinguished Faculty Fellow in the Wallace H. Coulter Department of Biomedical Engineering,a joint program of Georgia Tech,Emory University,and Peking University.
References
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- ↑ Stroux, L.; Redman, C. W.; Georgieva, A.; Payne, S. J.; Clifford, G. D. (2017). "Doppler-based fetal heart rate analysis markers for the detection of early intrauterine growth restriction". Acta Obstetricia et Gynecologica Scandinavica. 96 (11): 1322–1329. doi:10.1111/aogs.13228. PMC 5643243 . PMID 28862738.
- ↑ Stroux, Lisa; Martinez, Boris; Coyote Ixen, Enma; King, Nora; Hall-Clifford, Rachel; Rohloff, Peter; Clifford, Gari D. (2016). "An mHealth monitoring system for traditional birth attendant-led antenatal risk assessment in rural Guatemala". Journal of Medical Engineering & Technology. 40 (7–8): 356–371. doi:10.1080/03091902.2016.1223196. PMC 5180361 . PMID 27696915.
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- ↑ "You Snooze, You Win: the PhysioNet/Computing in Cardiology Challenge 2018".
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- ↑ Neamatullah, Ishna; Douglass, Margaret M.; Lehman, Li-wei H.; Reisner, Andrew; Villarroel, Mauricio; Long, William J.; Szolovits, Peter; Moody, George B.; Mark, Roger G.; Clifford, Gari D. (2008). "Automated de-identification of free-text medical records". BMC Medical Informatics and Decision Making. 8: 32. doi: 10.1186/1472-6947-8-32 . PMC 2526997 . PMID 18652655.
- ↑ McSharry, P.E.; Clifford, G.D.; Tarassenko, L.; Smith, L.A. (2003). "A dynamical model for generating synthetic electrocardiogram signals". IEEE Transactions on Biomedical Engineering. 50 (3): 289–294. doi:10.1109/TBME.2003.808805. PMID 12669985. S2CID 544816.
- ↑ Clifford, Gari; Sameni, Reza; Ward, Jay; Robinson, Julian; Wolfberg, Adam J. (2011). "Clinically accurate fetal ECG parameters acquired from maternal abdominal sensors". American Journal of Obstetrics and Gynecology. 205 (1): 47.e1–47.e5. doi:10.1016/j.ajog.2011.02.066. PMC 3145045 . PMID 21514560.
- ↑ "A Nonlinear Bayesian Filtering Framework for ECG Denoising".
- ↑ Sameni, Reza; Clifford, Gari D.; Jutten, Christian; Shamsollahi, Mohammad B. (2007). "Multichannel ECG and Noise Modeling: Application to Maternal and Fetal ECG Signals". EURASIP Journal on Advances in Signal Processing. 2007: 043407. Bibcode:2007EJASP2007...50S. doi: 10.1155/2007/43407 . hdl: 1721.1/67338 .
- ↑ Clifford, G.; Sameni, R.; Ward, J.; Robinson, J.; Wolfberg, A. J. (2011). "Clinically accurate fetal ECG parameters acquired from maternal abdominal sensors". American Journal of Obstetrics and Gynecology. 205 (1): 47.e1–5. doi:10.1016/j.ajog.2011.02.066. PMC 3145045 . PMID 21514560.
- ↑ Palmius, N.; Saunders, K.; Osipov, M.; Goodwin, G.M.; Clifford, G.D.; Bilderbeck, A.C.; Tsanas, A. (2014). "A multi-sensor monitoring system for objective mental health management in resource constrained environments". Appropriate Healthcare Technologies for Low Resource Settings (AHT 2014). p. 4. doi:10.1049/cp.2014.0764. ISBN 978-1-84919-915-5.
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- ↑ Osipov, M.; Behzadi, Y.; Kane, J. M.; Petrides, G.; Clifford, G. D. (2015). "Objective identification and analysis of physiological and behavioral signs of schizophrenia". Journal of Mental Health. 24 (5): 276–282. doi:10.3109/09638237.2015.1019048. PMC 4776688 . PMID 26193048.
- ↑ Reinertsen, E.; Shashikumar, S. P.; Shah, A. J.; Nemati, S.; Clifford, G. D. (2018). "Multiscale network dynamics between heart rate and locomotor activity are altered in schizophrenia". Physiological Measurement. 39 (11): 115001. Bibcode:2018PhyM...39k5001R. doi:10.1088/1361-6579/aae1ed. PMC 6258081 . PMID 30222594.
- ↑ Jiang, Z.; Harati, S.; Crowell, A.; Mayberg, H. S.; Nemati, S.; Clifford, G. D. (2021). "Classifying Major Depressive Disorder and Response to Deep Brain Stimulation Over Time by Analyzing Facial Expressions". IEEE Transactions on Bio-Medical Engineering. 68 (2): 664–672. doi:10.1109/TBME.2020.3010472. PMC 7891869 . PMID 32746065.
- ↑ Haque, R. U.; Pongos, A. L.; Manzanares, C. M.; Lah, J. J.; Levey, A. I.; Clifford, G. D. (2021). "Deep Convolutional Neural Networks and Transfer Learning for Measuring Cognitive Impairment Using Eye-Tracking in a Distributed Tablet-Based Environment". IEEE Transactions on Bio-Medical Engineering. 68 (1): 11–18. doi:10.1109/TBME.2020.2990734. PMC 9216227 . PMID 32340935. S2CID 216595655.
- ↑ Cakmak, A. S.; et al. (2021). "Classification and prediction of post-trauma outcomes related to PTSD using circadian rhythm changes measured via wrist-worn research watch in a large longitudinal cohort". IEEE Journal of Biomedical and Health Informatics. 25 (8): 2866–2876. doi:10.1109/JBHI.2021.3053909. PMC 8395207 . PMID 33481725. S2CID 231687580.
- ↑ "Martin Black award".
- ↑ "2023 Newly Elevated Fellows" (PDF). IEEE.org.