Finite-Element-Based Discretization and Regularization Strategies for 3-D Inverse Electrocardiography , Student Member, IEEE
... cardiac activities represented either by epicardial potentials or current sources within the heart; or as an inverse problem where the goal is to noninvasively estimate cardiac electrical activity from voltage distributions measured on the body surface. This paper studies one type of potential-based ...
... cardiac activities represented either by epicardial potentials or current sources within the heart; or as an inverse problem where the goal is to noninvasively estimate cardiac electrical activity from voltage distributions measured on the body surface. This paper studies one type of potential-based ...
IOSR Journal of Dental and Medical Sciences (IOSR-JDMS)
... reported by Bhatia. 14 Dwivedi et al 15 have reported that PGE- like activity is enhanced in ischaemic rabbit aorta. The enhancement of PGE- like activity by Terminalia arjuna may account to some extent for the observed rise in coronary flow. So, it is evident from the study that Terminalia arjuna ( ...
... reported by Bhatia. 14 Dwivedi et al 15 have reported that PGE- like activity is enhanced in ischaemic rabbit aorta. The enhancement of PGE- like activity by Terminalia arjuna may account to some extent for the observed rise in coronary flow. So, it is evident from the study that Terminalia arjuna ( ...
A Study of Early Afterdepolarizations in a Model for Human
... Naz /Kz exchanger current. In many cases such changes were made to mimic the onset of the long-QT syndrome or to describe the action of a certain drug. Except in the study of Ref. [22], only a few parameters were changed and then set to very specific values. Comprehensive studies, which require grad ...
... Naz /Kz exchanger current. In many cases such changes were made to mimic the onset of the long-QT syndrome or to describe the action of a certain drug. Except in the study of Ref. [22], only a few parameters were changed and then set to very specific values. Comprehensive studies, which require grad ...
Left ventricular endocardial longitudinal and transverse - AJP
... calculate stroke volume. All distances, flows, and pressures were displayed and recorded simultaneously on the same screen by the Sonometrics system to ensure that all data were synchronized and recorded on the same time line. An effort was made to record the measurements under stable hemodynamic co ...
... calculate stroke volume. All distances, flows, and pressures were displayed and recorded simultaneously on the same screen by the Sonometrics system to ensure that all data were synchronized and recorded on the same time line. An effort was made to record the measurements under stable hemodynamic co ...
Demystifying the Pediatric Cardiomyopathies
... The pathologist generally confronts a pediatric cardiomyopathy case well after clinical, diagnostic imaging and metabolic-genetic evaluations have been initiated. This prepathology processing aims to identify a secondary cardiomyopathy, or if excluded, then reveal a primary cardiomyopathy etiology. ...
... The pathologist generally confronts a pediatric cardiomyopathy case well after clinical, diagnostic imaging and metabolic-genetic evaluations have been initiated. This prepathology processing aims to identify a secondary cardiomyopathy, or if excluded, then reveal a primary cardiomyopathy etiology. ...
Focal atrial tachycardia
... Spach et al. 23 were able to induce stable reentrant ATs in areas as small as 1.6 mm2. In the intact human heart these tachycardias may arise due to an increase in the fibrous connective tissue between cardiac fibers, which results in a disruption of the gap junctional communication between adjacent ...
... Spach et al. 23 were able to induce stable reentrant ATs in areas as small as 1.6 mm2. In the intact human heart these tachycardias may arise due to an increase in the fibrous connective tissue between cardiac fibers, which results in a disruption of the gap junctional communication between adjacent ...
The Wavelength of the Cardiac Impulse and Reentrant Arrhythmias
... 95% O2 and 5% CO2; pH was 7.35 ± 0.05, and temperature was kept at 37°C unless stated otherwise. A programmable stimulator was used to deliver constant current pulses (duration 1-2 msec, strength 2-4 times diastolic threshold) through two platinum plates ( 2 x 4 mm) embracing one end of the preparat ...
... 95% O2 and 5% CO2; pH was 7.35 ± 0.05, and temperature was kept at 37°C unless stated otherwise. A programmable stimulator was used to deliver constant current pulses (duration 1-2 msec, strength 2-4 times diastolic threshold) through two platinum plates ( 2 x 4 mm) embracing one end of the preparat ...
the PDF - Heart Rhythm Society
... SCD.33–35 Currently, assessment of left ventricular (LV) ejection fraction is commonly used to guide primary prevention of SCD,20 but there is considerable interest in using markers that reflect arrhythmia substrates more directly, and therefore enrich the prediction of SCD events. Invasive electrop ...
... SCD.33–35 Currently, assessment of left ventricular (LV) ejection fraction is commonly used to guide primary prevention of SCD,20 but there is considerable interest in using markers that reflect arrhythmia substrates more directly, and therefore enrich the prediction of SCD events. Invasive electrop ...
Endothelial Dysfunction
... Beyond endothelial cells in various peripheral organs, endothelial cells in the heart warrant consideration for their role in HFPEF (4). These include endothelial cells of the coronary vessels, but more important of the intramyocardial capillaries and endocardium where endothelial cells directly com ...
... Beyond endothelial cells in various peripheral organs, endothelial cells in the heart warrant consideration for their role in HFPEF (4). These include endothelial cells of the coronary vessels, but more important of the intramyocardial capillaries and endocardium where endothelial cells directly com ...
Prognostic Value of a Novel Classification Scheme for Heart Failure
... classes, the distinctions were less clear: A defining feature of class 3 was that nearly all subjects had interstitial or pulmonary edema, in contrast to class 2, where only 1 percent of subjects had the sign. Among class 3 subjects, the presence of interstitial or pulmonary edema was consistent wit ...
... classes, the distinctions were less clear: A defining feature of class 3 was that nearly all subjects had interstitial or pulmonary edema, in contrast to class 2, where only 1 percent of subjects had the sign. Among class 3 subjects, the presence of interstitial or pulmonary edema was consistent wit ...
Left Ventricular Assist Devices - Ether
... blood flow. These devices are useful in two groups of patients. The first group consists of patients who require ventricular assistance to allow the heart to rest and recover its function. Under these circumstances, it is critical to obtain complete drainage of the ventricle in order to unload the v ...
... blood flow. These devices are useful in two groups of patients. The first group consists of patients who require ventricular assistance to allow the heart to rest and recover its function. Under these circumstances, it is critical to obtain complete drainage of the ventricle in order to unload the v ...
anomalous pulmonary venous return with stenosis in
... transformed into the right sinus venosus, from which the right vena cava superior is formed (R-SVC) and the vena azygos, and the left-hand side evolves into the left sinus venosus, from which the left vena cava superior and coronary sinus are formed, and from the umbilical and vitilline system the i ...
... transformed into the right sinus venosus, from which the right vena cava superior is formed (R-SVC) and the vena azygos, and the left-hand side evolves into the left sinus venosus, from which the left vena cava superior and coronary sinus are formed, and from the umbilical and vitilline system the i ...
Abnormal Heart Sounds Detected from Short Duration
... Heart sounds may indicate a range of cardiac pathologies such as vessel stenosis or valve regurgitation, with such abnormalities giving rise to different sound profiles to that of the normal, healthy heart [1]. The automated detection of abnormal heart sounds from electronic stethoscope recordings r ...
... Heart sounds may indicate a range of cardiac pathologies such as vessel stenosis or valve regurgitation, with such abnormalities giving rise to different sound profiles to that of the normal, healthy heart [1]. The automated detection of abnormal heart sounds from electronic stethoscope recordings r ...
Noninvasive Pacing
... used as a permanent treatment for conduction problems. For these reasons, in the late 1950s, the development of transvenous endocardial pacing largely replaced noninvasive pacing. In the 1980s, due to advances in technology, noninvasive pacing reemerged as an emergency therapy for symptomatic bradyc ...
... used as a permanent treatment for conduction problems. For these reasons, in the late 1950s, the development of transvenous endocardial pacing largely replaced noninvasive pacing. In the 1980s, due to advances in technology, noninvasive pacing reemerged as an emergency therapy for symptomatic bradyc ...
The SynCardia CardioWeste Total Artificial Heart
... situation has lead to significant embolization and stroke. Removing the ventricles with orthotopic placement of a TAH significantly reduces this embolic risk. Cardiac arrhythmias, frequent in the end-stage heart, undermine ventricular contractile performance and further reduce VAD function. Cardiac ...
... situation has lead to significant embolization and stroke. Removing the ventricles with orthotopic placement of a TAH significantly reduces this embolic risk. Cardiac arrhythmias, frequent in the end-stage heart, undermine ventricular contractile performance and further reduce VAD function. Cardiac ...
Temperature dependence of cardiac performance in the lobster
... the temperature effects on the cardiac ganglion. In that vary in temperature over a 25°C range, depending on contrast to earlier reports suggesting that the strength and the season and water depth. To investigate whether the the frequency of the lobster heartbeat are positively lobster heart functio ...
... the temperature effects on the cardiac ganglion. In that vary in temperature over a 25°C range, depending on contrast to earlier reports suggesting that the strength and the season and water depth. To investigate whether the the frequency of the lobster heartbeat are positively lobster heart functio ...
Standardized Definitions for Cardiovascular and Stroke
... The purpose of this document is to provide a framework of definitions for cardiovascular and stroke end points in clinical trials. These definitions are based on clinical and research expertise, published guidelines and definitions, and our current understanding of the specific laboratory tests, dia ...
... The purpose of this document is to provide a framework of definitions for cardiovascular and stroke end points in clinical trials. These definitions are based on clinical and research expertise, published guidelines and definitions, and our current understanding of the specific laboratory tests, dia ...
PDF-1 - RUcore - Rutgers University
... 1.1 Heart and Heartbeat Coordination The human heart is a muscular organ that is composed of four chambers, the left atria, right atria, left ventricle and the right ventricle. The left and right atria receive blood from the pulmonary and systemic venous system respectively, while the left ventricle ...
... 1.1 Heart and Heartbeat Coordination The human heart is a muscular organ that is composed of four chambers, the left atria, right atria, left ventricle and the right ventricle. The left and right atria receive blood from the pulmonary and systemic venous system respectively, while the left ventricle ...
The multi-modality cardiac imaging approach to the Athlete`s heart
... cardiomyopathy (HCM). LV end-diastolic diameter becomes larger (.55 mm) than the normal limits only in end-stage HCM patients when the LV ejection fraction is ,50%. Patients with HCM also show early impairment of LV diastolic function, whereas athletes have normal diastolic function. When echocardio ...
... cardiomyopathy (HCM). LV end-diastolic diameter becomes larger (.55 mm) than the normal limits only in end-stage HCM patients when the LV ejection fraction is ,50%. Patients with HCM also show early impairment of LV diastolic function, whereas athletes have normal diastolic function. When echocardio ...
Acquired Heart Diseases - Akademija nauka i umjetnosti Bosne i
... virus or tuberculosis, or complications associated with collagenases or open-heart surgery (postpericardial syndrome). Patients may complain of precordial pain (dull, aching, or stabbing) with occasional radiation to the shoulder and neck. This pain may be relieved by leaning forward and may be wors ...
... virus or tuberculosis, or complications associated with collagenases or open-heart surgery (postpericardial syndrome). Patients may complain of precordial pain (dull, aching, or stabbing) with occasional radiation to the shoulder and neck. This pain may be relieved by leaning forward and may be wors ...
Kathleen Stergiopoulos, Elaine Shiang, and Travis Bench 2011;58;337-350 doi:10.1016/j.jacc.2011.04.014
... heart disease found that many of these women could not recall whether they were ever properly counseled by a health care provider or whether they were ever informed of an increased risk for maternal complications (21). Strict prenatal care and early risk stratification are fundamental measures to im ...
... heart disease found that many of these women could not recall whether they were ever properly counseled by a health care provider or whether they were ever informed of an increased risk for maternal complications (21). Strict prenatal care and early risk stratification are fundamental measures to im ...
From Frank-Starling relationships to ventriculo
... is stretched progressively to greater initial lengths prior to contraction. In 1898, Frank went further to characterise the contractions of the frog ventricle in a pressure-volume diagram [2]. As shown in Fig. 2, the diagram was made of an upper curve (“isomet maxima”) corresponding to the peak pres ...
... is stretched progressively to greater initial lengths prior to contraction. In 1898, Frank went further to characterise the contractions of the frog ventricle in a pressure-volume diagram [2]. As shown in Fig. 2, the diagram was made of an upper curve (“isomet maxima”) corresponding to the peak pres ...
Mitochondrial ATPase and high-energy phosphates in - AJP
... volumes and the spatial resolution attained by this method have been published previously (11, 24, 33). In this application of the RAPP-ISIS technique, signal origin was first restricted to an 18 ⫻ 18-mm two-dimensional column perpendicular to the LV wall and further localized in three well-resolved ...
... volumes and the spatial resolution attained by this method have been published previously (11, 24, 33). In this application of the RAPP-ISIS technique, signal origin was first restricted to an 18 ⫻ 18-mm two-dimensional column perpendicular to the LV wall and further localized in three well-resolved ...
Mitral Valve
... Mitral Valve Obstruction o Mitral stenosis Most common cause – rheumatic heart disease Characterized by a narrowing of the left ventricular inflow tract at the level of the mitral valve Impairs left ventricular filling during diastole Causes rise in left atrial pressure Results in pulmon ...
... Mitral Valve Obstruction o Mitral stenosis Most common cause – rheumatic heart disease Characterized by a narrowing of the left ventricular inflow tract at the level of the mitral valve Impairs left ventricular filling during diastole Causes rise in left atrial pressure Results in pulmon ...
Electrocardiography
Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles (""leads"") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.