Effects of a Left Ventricular Assist Device with a Centrifugal Pump on
... 235±34 msec), and control and 75% assist (329±43 versus 210±39 msec). In the left ventricular filling phase, negative left ventricular pressure was observed in the 50% assist group and 75% assist group, implying the atrioventricular pressure gradient increased with the assist rate (Fig. 2). These fi ...
... 235±34 msec), and control and 75% assist (329±43 versus 210±39 msec). In the left ventricular filling phase, negative left ventricular pressure was observed in the 50% assist group and 75% assist group, implying the atrioventricular pressure gradient increased with the assist rate (Fig. 2). These fi ...
Essential Opposite Roles of ERK and Akt Signaling in Cardiac
... advocating the use of this drug, despite its small therapeutic index (Gheorghiade et al., 2013; van Veldhuisen et al., 2013). A comprehensive understanding of the mechanisms involved in CS-induced effects on heart contractility may lead to new pharmacological tools for the improvement of CS use. The ...
... advocating the use of this drug, despite its small therapeutic index (Gheorghiade et al., 2013; van Veldhuisen et al., 2013). A comprehensive understanding of the mechanisms involved in CS-induced effects on heart contractility may lead to new pharmacological tools for the improvement of CS use. The ...
Papillary Muscle Shortening in the Intact Dog
... match was obtained by repeating the maneuver. Moreover, longer cycles on the recorded ECG (due to sinus arrhythmia) corresponded to an appropriately increased number of frames between the matching flash-marked frames. The cineradiographic filming rate was 30 frames/sec. In three dogs an additional f ...
... match was obtained by repeating the maneuver. Moreover, longer cycles on the recorded ECG (due to sinus arrhythmia) corresponded to an appropriately increased number of frames between the matching flash-marked frames. The cineradiographic filming rate was 30 frames/sec. In three dogs an additional f ...
Paper
... Model abstraction [9] was originally proposed as a powerful state-reduction technique to alleviate the state explosion problem [10] during model-checking. Models are created as abstraction of the original system. Since the abstracted models have more behaviors than the original system, properties sa ...
... Model abstraction [9] was originally proposed as a powerful state-reduction technique to alleviate the state explosion problem [10] during model-checking. Models are created as abstraction of the original system. Since the abstracted models have more behaviors than the original system, properties sa ...
Congestive Heart Failure Educational Handbook
... The heart has four chambers – the two upper chambers are the left and right atria, and the two lower chambers are the left and right ventricles. The right side of the heart pumps blood from the body to the lungs for oxygen; whereas, the left side pumps blood from the lungs to the body. Damage to the ...
... The heart has four chambers – the two upper chambers are the left and right atria, and the two lower chambers are the left and right ventricles. The right side of the heart pumps blood from the body to the lungs for oxygen; whereas, the left side pumps blood from the lungs to the body. Damage to the ...
Right ventricular function in patients with pulmonary hypertension
... (MPI) has been proposed6 – 8 for the evaluation of combined systolic and diastolic ventricular function. This index that can be measured by both pulsed-wave Doppler and tissue Doppler imaging (TDI), has been proved to correlate well with invasive procedures such as catheterization,9 to reflect disea ...
... (MPI) has been proposed6 – 8 for the evaluation of combined systolic and diastolic ventricular function. This index that can be measured by both pulsed-wave Doppler and tissue Doppler imaging (TDI), has been proved to correlate well with invasive procedures such as catheterization,9 to reflect disea ...
Of circles and spirals: Bridging the gap between the leading circle
... normal tissue or in the context of specific pathological changes (e.g., in the presence of a myocardial infarction) should be classified, or whether it is always important to distinguish between different types of reentry. A key concept behind all types of reentrant activity is the source-sink relat ...
... normal tissue or in the context of specific pathological changes (e.g., in the presence of a myocardial infarction) should be classified, or whether it is always important to distinguish between different types of reentry. A key concept behind all types of reentrant activity is the source-sink relat ...
Evidence of Incomplete Left Ventricular Relaxation in the Dog
... ordinates were digitized at 4.0-ms intervals along this portion of the curve and were plotted on-line as (lnP, t). In some beats dP/dt after maximal negative dPldt was constant at or near its minimal value for 10-20 ms, and thereafter increased toward zero continuously. In these beats digitization o ...
... ordinates were digitized at 4.0-ms intervals along this portion of the curve and were plotted on-line as (lnP, t). In some beats dP/dt after maximal negative dPldt was constant at or near its minimal value for 10-20 ms, and thereafter increased toward zero continuously. In these beats digitization o ...
and diagnosis Ischaemic mitral regurgitation: mechanisms
... with complications of infarction. The term ischaemic MR is usually understood to relate to chronic MR, occurring .2 weeks after infarction and in the absence of structural mitral valve disease. In terms of pathogenesis, this should be considered a disease of abnormal left ventricular (LV) shape and ...
... with complications of infarction. The term ischaemic MR is usually understood to relate to chronic MR, occurring .2 weeks after infarction and in the absence of structural mitral valve disease. In terms of pathogenesis, this should be considered a disease of abnormal left ventricular (LV) shape and ...
Congenital heart diseases Simple complement 1. The most
... 1. The most frequently found congenital heart disease (CHD) in premature new-borns is: A. Atrial septal defect B. Ventricular septal defect C. Patent ductus arteriosus D. Coarctation of the aorta E. Tetralogy of Fallot 2. CHD with left-right shunt are the follows, except: A. Ventricular septal defec ...
... 1. The most frequently found congenital heart disease (CHD) in premature new-borns is: A. Atrial septal defect B. Ventricular septal defect C. Patent ductus arteriosus D. Coarctation of the aorta E. Tetralogy of Fallot 2. CHD with left-right shunt are the follows, except: A. Ventricular septal defec ...
valves - Anatomy and Physiology
... pulmonary and systemic circuits • Pulmonary circuit short, low-pressure circulation • Systemic circuit long, high-friction circulation • Anatomy of ventricles reflects differences – Left ventricle walls 3X thicker than right • Pumps with greater pressure © 2013 Pearson Education, Inc. ...
... pulmonary and systemic circuits • Pulmonary circuit short, low-pressure circulation • Systemic circuit long, high-friction circulation • Anatomy of ventricles reflects differences – Left ventricle walls 3X thicker than right • Pumps with greater pressure © 2013 Pearson Education, Inc. ...
Current Perceptions of the Epidemiology of Atrial Fibrillation
... Framingham Study data indicate that AF and heart failure often coexist and that each may have an adverse impact on the other.34 The decreased survival rate associated with AF occurs across a wide age range and is partially attributable to the vulnerability of patients who have AF to heart failure. R ...
... Framingham Study data indicate that AF and heart failure often coexist and that each may have an adverse impact on the other.34 The decreased survival rate associated with AF occurs across a wide age range and is partially attributable to the vulnerability of patients who have AF to heart failure. R ...
Evaluation of right and left ventricular function
... A comprehensive 2D, colour, pulsed, and continuouswave Doppler examination was performed following the recommendations of the American Society of Echocardiography for transthoracic studies. Parasternal long-axis views were used to derive M-mode measurement of left ventricular (LV) end-diastolic dime ...
... A comprehensive 2D, colour, pulsed, and continuouswave Doppler examination was performed following the recommendations of the American Society of Echocardiography for transthoracic studies. Parasternal long-axis views were used to derive M-mode measurement of left ventricular (LV) end-diastolic dime ...
C:\Documents and Settings\Reb...uhi.default\Cache\0F1E60D5d01
... whereas transient diastolic stretch has been shown to result in depolarization (36), often sufficient to elicit an action potential (13, 24). Mechanical stretch has been demonstrated to generate atrial and ventricular arrhythmias (14, 17, 41, 51). Regional inhomogeneities in contractility and mechan ...
... whereas transient diastolic stretch has been shown to result in depolarization (36), often sufficient to elicit an action potential (13, 24). Mechanical stretch has been demonstrated to generate atrial and ventricular arrhythmias (14, 17, 41, 51). Regional inhomogeneities in contractility and mechan ...
Contemporary Pacemakers - CCM, University of Pittsburgh
... If a blunted heart rate response to exercise occurs, rateadaptive pacemakers are useful.5 These devices have special sensor(s) that, when triggered during exercise, increase the pacing rate (so-called sensor rate). Most commonly used sensors monitor body movement by detecting vibration (activity sen ...
... If a blunted heart rate response to exercise occurs, rateadaptive pacemakers are useful.5 These devices have special sensor(s) that, when triggered during exercise, increase the pacing rate (so-called sensor rate). Most commonly used sensors monitor body movement by detecting vibration (activity sen ...
Mitochondrial oxidative stress and dysfunction in myocardial
... Even though mitochondrial electron transport is considered to play an important role in ROS production in heart failure, other enzymatic sources of ROS generation such as vascular endothelial cells (via xanthine oxidase and/or NAD(P)H oxidase) and activated leukocytes (via NAD(P)H oxidase) could als ...
... Even though mitochondrial electron transport is considered to play an important role in ROS production in heart failure, other enzymatic sources of ROS generation such as vascular endothelial cells (via xanthine oxidase and/or NAD(P)H oxidase) and activated leukocytes (via NAD(P)H oxidase) could als ...
Update on resuscitation: The 2015 AHA Resuscitation guidelines
... reviewed studies that looked at the chest compression rate and outcomes such as blood pressure, end-tidal CO2, return of spontanous circulation (ROSC), hospital discharge and survival after cardiac arrest. They concluded that there may be an ideal range between which to perform chest compressions. T ...
... reviewed studies that looked at the chest compression rate and outcomes such as blood pressure, end-tidal CO2, return of spontanous circulation (ROSC), hospital discharge and survival after cardiac arrest. They concluded that there may be an ideal range between which to perform chest compressions. T ...
Heart Failure in Non-Caucasians, Women, and Older Adults: A
... South Asians have more coronary risk factors than Caucasian patients, and it has been suggested that this group may have a higher risk of premature CAD leading to HF at a younger age.40 Although less well characterized than other populations, South Asian men appear to have impaired endothelial funct ...
... South Asians have more coronary risk factors than Caucasian patients, and it has been suggested that this group may have a higher risk of premature CAD leading to HF at a younger age.40 Although less well characterized than other populations, South Asian men appear to have impaired endothelial funct ...
Utility of metabolic exercise testing in distinguishing
... substantial minority of patients with HCM have a wall thickness in the same range as athletic competitors. Such individuals are often asymptomatic and participate in competitive sports but remain at risk for sudden death (12–14). At present, routine genetic testing is not a practical method for diff ...
... substantial minority of patients with HCM have a wall thickness in the same range as athletic competitors. Such individuals are often asymptomatic and participate in competitive sports but remain at risk for sudden death (12–14). At present, routine genetic testing is not a practical method for diff ...
Right Atrial Anatomical Remodeling Affects Early Outcomes of
... lasted longer than 7 days or required termination by cardioversion, either with drugs or by direct current cardioversion. We also divided the enrolled subjects according to the presence of early recurrence (within 3 months) or 1-year recurrence of AF after successful RFA. No patient in this study ha ...
... lasted longer than 7 days or required termination by cardioversion, either with drugs or by direct current cardioversion. We also divided the enrolled subjects according to the presence of early recurrence (within 3 months) or 1-year recurrence of AF after successful RFA. No patient in this study ha ...
Clinical guidance for the Management of patients with confirmed
... The purpose of this document is to provide guidance and a pathway for the treatment of patients with heart failure. The guidance is separated into two parts, the first addresses best practice in the clinical management of heart failure itself and the second focuses on management of symptoms commonly ...
... The purpose of this document is to provide guidance and a pathway for the treatment of patients with heart failure. The guidance is separated into two parts, the first addresses best practice in the clinical management of heart failure itself and the second focuses on management of symptoms commonly ...
Brugada Syndrome - Department of Medicine | Columbia University
... helped refine the current accepted definite diagnostic criteria for the syndrome, briefly, the characteristic ECG pattern (right bundle branch block and persistent ST segment elevation in right precordial leads) together with the susceptibility for ventricular fibrillation and sudden death. In the l ...
... helped refine the current accepted definite diagnostic criteria for the syndrome, briefly, the characteristic ECG pattern (right bundle branch block and persistent ST segment elevation in right precordial leads) together with the susceptibility for ventricular fibrillation and sudden death. In the l ...
Myocardial Perfusion Scintigraphy
... rays and/or X-rays, when the nucleus of these atoms change from one energy level to a lower one. Thus, the body is imaged “from the inside out” by recording the distribution of radioactivity coming from internally administered radionuclides using special devices. Radiopharmaceuticals are radionuclid ...
... rays and/or X-rays, when the nucleus of these atoms change from one energy level to a lower one. Thus, the body is imaged “from the inside out” by recording the distribution of radioactivity coming from internally administered radionuclides using special devices. Radiopharmaceuticals are radionuclid ...
Redalyc.Treatment of Chronic Atrial Fibrillation During Surgery for
... in the right atrium excludes one of the stimuli of reentry circuits in the atrial wall and also the septal channels. The circuits near the ostia of the superior and inferior vena cava veins were considered by Frame et al.[16] as capable of generating tachyarrhythmias. Interruption can be performed e ...
... in the right atrium excludes one of the stimuli of reentry circuits in the atrial wall and also the septal channels. The circuits near the ostia of the superior and inferior vena cava veins were considered by Frame et al.[16] as capable of generating tachyarrhythmias. Interruption can be performed e ...
Pulmonary Atresia and Intact Ventricular Septum
... (B) The pulmonary valve is derived from endocardial tissue within the conotruncus. (C) In pulmonary atresia/intact ventricular septum, the heart may be mildly or massively enlarged. (D) With pulmonary atresia/intact ventricular septum there is an obligatory right-to-left shunt at the atrial le ...
... (B) The pulmonary valve is derived from endocardial tissue within the conotruncus. (C) In pulmonary atresia/intact ventricular septum, the heart may be mildly or massively enlarged. (D) With pulmonary atresia/intact ventricular septum there is an obligatory right-to-left shunt at the atrial le ...
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.