the mechanism of the nervous regulation of the crayfish heart
... diminish further this possibility. Experiments in which the exposed part of the nerve was stimulated by lifting it on micromanipulated electrodes showed the same results. During stimulation of the accelerator, both the frequency and amplitude of the beat are increased. In some cases during maximum s ...
... diminish further this possibility. Experiments in which the exposed part of the nerve was stimulated by lifting it on micromanipulated electrodes showed the same results. During stimulation of the accelerator, both the frequency and amplitude of the beat are increased. In some cases during maximum s ...
Continuous Flow Left ventricular Assist Device
... measures of RV structure and function [8]. This review will focus on two indices that have been studied in CF-LVAD patients, are reproducible, and are easily obtainable: (a) tricuspid annular plane systolic excursion (TAPSE) and (b) heart rate–corrected duration of tricuspid regurgitation (TRDc). T ...
... measures of RV structure and function [8]. This review will focus on two indices that have been studied in CF-LVAD patients, are reproducible, and are easily obtainable: (a) tricuspid annular plane systolic excursion (TAPSE) and (b) heart rate–corrected duration of tricuspid regurgitation (TRDc). T ...
Zimmermann WH, et al. Heart Muscle Engineering
... capacity of circulating stem cells to give rise to cardiac myocytes is controversial [43 –46]. Nevertheless, stem cells seem to be the only meaningful cell source to allocate enough myocytes for clinically relevant cardiac muscle engineering in the future. One gram of adult myocardium contains an es ...
... capacity of circulating stem cells to give rise to cardiac myocytes is controversial [43 –46]. Nevertheless, stem cells seem to be the only meaningful cell source to allocate enough myocytes for clinically relevant cardiac muscle engineering in the future. One gram of adult myocardium contains an es ...
RàL - WordPress.com
... Tet spells: caused by RV outflow tract obstruction / changes in vascular resistance (may also occur in patients with pul stenosis) decr SVR and pul blood flow RL shunting through VSD; precipitated by crying, fever, dehydration, incr RR, incr HR, defecation, feeding, anaphylaxis, hypoxia, acidos ...
... Tet spells: caused by RV outflow tract obstruction / changes in vascular resistance (may also occur in patients with pul stenosis) decr SVR and pul blood flow RL shunting through VSD; precipitated by crying, fever, dehydration, incr RR, incr HR, defecation, feeding, anaphylaxis, hypoxia, acidos ...
... graphic evidence of myocardial infarction (ST elevation between the tips of the mitral leaflets, and pulmonary >1 mm in contiguous leads or subendocardial injury venous flow velocities were obtained by placing the pattern) and (3) transient elevation of creatinine kinase sample volume at least 1 cm ...
CLINICAL PROGRESS Living Man
... of woven Dacron and is available in size 8Y2 F. The coronary venous catheter no. 2* is a 7F woven Dacron which tapers down to size 532 F toward the tip. The very tip is shaped like an olive, having a size of 9F (fig. 1). For coronary venography one of the special catheters described is introduced in ...
... of woven Dacron and is available in size 8Y2 F. The coronary venous catheter no. 2* is a 7F woven Dacron which tapers down to size 532 F toward the tip. The very tip is shaped like an olive, having a size of 9F (fig. 1). For coronary venography one of the special catheters described is introduced in ...
ACUPUNCTURE AND ARRHYTHMIAS AND HEART FAILURE
... Premature beats are the most common type of arrhythmia. They are harmless most of the time and often cause no symptoms. When symptoms do occur, they usually feel like fluttering in the chest or a feeling of a skipped heartbeat. Usually, premature beats need no treatment, especially in healthy people ...
... Premature beats are the most common type of arrhythmia. They are harmless most of the time and often cause no symptoms. When symptoms do occur, they usually feel like fluttering in the chest or a feeling of a skipped heartbeat. Usually, premature beats need no treatment, especially in healthy people ...
Left ventricle unloading during veno-arterial
... blood flow with VA-ECMO impairs several parameters of LV performance. VA-ECMO, therefore, represents a circulatory rather than LV assist device, and LV overload during VA-ECMO therapy represents a critical condition that frequently requires urgent intervention to unload the left ventricle. The prese ...
... blood flow with VA-ECMO impairs several parameters of LV performance. VA-ECMO, therefore, represents a circulatory rather than LV assist device, and LV overload during VA-ECMO therapy represents a critical condition that frequently requires urgent intervention to unload the left ventricle. The prese ...
Exercise Training in Chronic Heart Failure
... initiating exercise therapy. heart failure. Absolute conTo date, there is no established gold stan- traindications are listed in Table 4. While there dard for exercise training CHF patients, is no minimum left ventricular ejection fraction although guidelines have been published by standard for trai ...
... initiating exercise therapy. heart failure. Absolute conTo date, there is no established gold stan- traindications are listed in Table 4. While there dard for exercise training CHF patients, is no minimum left ventricular ejection fraction although guidelines have been published by standard for trai ...
Slide 1
... Valves of the heart (superior view from anterior, atria removed). (A) When the heart is relaxed (diastole), the AV valves are open and blood flows freely from the atria to the ventricles. The pulmonary and aortic valves are closed. (B) When the ventricles contract, the AV valves close and blood pum ...
... Valves of the heart (superior view from anterior, atria removed). (A) When the heart is relaxed (diastole), the AV valves are open and blood flows freely from the atria to the ventricles. The pulmonary and aortic valves are closed. (B) When the ventricles contract, the AV valves close and blood pum ...
Cardiac output (CO) and systemic vascular resistance (SVR)– the
... • Easy, painless, non-invasive and continuous estimation of CO and SVR might improve care of multiple conditions affecting the heart, resistance arterioles and capacitance veins. • CO and SVR might be the next vital signs. ...
... • Easy, painless, non-invasive and continuous estimation of CO and SVR might improve care of multiple conditions affecting the heart, resistance arterioles and capacitance veins. • CO and SVR might be the next vital signs. ...
Is Fibrillation Chaos?
... ligations and without. In many cases, fibrillation had been induced one or more times previously and terminated with electric shock. The episodes of VF were uninterrupted by attempts to terminate or modify the fibrillation, and the animals were on mechanical respiration at a fixed rate. ECGs were co ...
... ligations and without. In many cases, fibrillation had been induced one or more times previously and terminated with electric shock. The episodes of VF were uninterrupted by attempts to terminate or modify the fibrillation, and the animals were on mechanical respiration at a fixed rate. ECGs were co ...
hypoplastic left heart syndrome
... structures of the heart are underdeveloped or ‘hypoplastic’, including diminutive left ventricle, hypoplasia of the ascending aorta and ¹stenosis (narrowing) or ²atresia (absence) of the aortic and the bicuspid or mitral valve. The left side of the heart is unable to pump any blood to the body, whic ...
... structures of the heart are underdeveloped or ‘hypoplastic’, including diminutive left ventricle, hypoplasia of the ascending aorta and ¹stenosis (narrowing) or ²atresia (absence) of the aortic and the bicuspid or mitral valve. The left side of the heart is unable to pump any blood to the body, whic ...
Journal of American Heart Ass. April 2012
... The American Heart Association makes every effort to avoid any actual or potential conflicts of interest that may arise as a result of an outside relationship or a personal, professional, or business interest of a member of the writing panel. Specifically, all members of the writing group are requir ...
... The American Heart Association makes every effort to avoid any actual or potential conflicts of interest that may arise as a result of an outside relationship or a personal, professional, or business interest of a member of the writing panel. Specifically, all members of the writing group are requir ...
Cardiology Review
... completion at 10 weeks • 1st organ to function in utero • Fetal heartbeat can be heard at 6wks Starts as long structure with 2 tubes • Starts as long structure with 2 tubes ...
... completion at 10 weeks • 1st organ to function in utero • Fetal heartbeat can be heard at 6wks Starts as long structure with 2 tubes • Starts as long structure with 2 tubes ...
Spatial relation of the right coronary artery to the cavotricuspid
... report a distance of approximately 5mm whereas RFlesions penetrate up to 8mm. ...
... report a distance of approximately 5mm whereas RFlesions penetrate up to 8mm. ...
Teacher`s Guide: Cardiovascular System
... Every time your heart beats, it pushes oxygen-carrying blood through your body. You can feel your heart beat - it’s called finding your pulse. Hold two fingers gently against your wrist or the side of your neck, where you can feel (and maybe even see) a blood vessel. (You have to be very still and q ...
... Every time your heart beats, it pushes oxygen-carrying blood through your body. You can feel your heart beat - it’s called finding your pulse. Hold two fingers gently against your wrist or the side of your neck, where you can feel (and maybe even see) a blood vessel. (You have to be very still and q ...
Session Number 206 Content Description
... Key concepts with Defibrillation Too much current causes damage to the heart Too little current fails to depolarize cells Monophasic delivers current that travels in single ...
... Key concepts with Defibrillation Too much current causes damage to the heart Too little current fails to depolarize cells Monophasic delivers current that travels in single ...
View - The Horseshoe Crab
... Due allowance must be made for fatigue effects in any quantitative evaluation of these results. The experiment indicates clearly tha.t each motor nerve has its own complement of contractile response in ,muscle tissue which is unaffected by stimulation of the other nerves. The preceding results direc ...
... Due allowance must be made for fatigue effects in any quantitative evaluation of these results. The experiment indicates clearly tha.t each motor nerve has its own complement of contractile response in ,muscle tissue which is unaffected by stimulation of the other nerves. The preceding results direc ...
Endocarditis - Patient Education Institute
... Endocarditis is treated with antibiotics. In some cases, surgery may also be needed. Antibiotics are usually given for 2 to 6 weeks through an intravenous, or IV, line inserted into a vein. The first week of treatment is often done in the hospital. If you are allowed to go home before treatment is d ...
... Endocarditis is treated with antibiotics. In some cases, surgery may also be needed. Antibiotics are usually given for 2 to 6 weeks through an intravenous, or IV, line inserted into a vein. The first week of treatment is often done in the hospital. If you are allowed to go home before treatment is d ...
Reflex Hemodynamic Responses Initiated from the Thoracic Aorta
... carotid arteries occluded, stretch of the walls of the thoracic aorta induced marked increases in systolic, diastolic, and pulse arterial pressures, left ventricular systolic pressure, and dP/dt max. Heart rate increased only a few beats per minute, and left ventricular end-diastolic pressure increa ...
... carotid arteries occluded, stretch of the walls of the thoracic aorta induced marked increases in systolic, diastolic, and pulse arterial pressures, left ventricular systolic pressure, and dP/dt max. Heart rate increased only a few beats per minute, and left ventricular end-diastolic pressure increa ...
Derivation of the respiratory rate signal from a single lead ECG
... lead III, the positive electrode is placed on the left leg and the negative electrode on the left arm. In all lead configurations, the difference of potential measured between two electrodes is always with reference to a third electrode which is placed on the right leg. In defining the bipolar leads ...
... lead III, the positive electrode is placed on the left leg and the negative electrode on the left arm. In all lead configurations, the difference of potential measured between two electrodes is always with reference to a third electrode which is placed on the right leg. In defining the bipolar leads ...
Diurnal variations of the dominant cycle length of chronic atrial
... frequency domain analysis was performed on the residual ECG signal within the 3- to 12-Hz range using a fast Fourier transform. The peak frequency in the generated spectrum, expressed as a cycle length, constituted the dominant atrial cycle length (DACL). The method is illustrated in Fig. 1. For thi ...
... frequency domain analysis was performed on the residual ECG signal within the 3- to 12-Hz range using a fast Fourier transform. The peak frequency in the generated spectrum, expressed as a cycle length, constituted the dominant atrial cycle length (DACL). The method is illustrated in Fig. 1. For thi ...
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.