Observations on the Carotid Sinus Reflex
... In most of the published reports of the beneficial effect of carotid sinus pressure in angina pectoris, the anginal attacks were spontaneous and the usual duration of pain unknown. In the studies of Wayne and Laplace,8 although anginal attacks were induced by exertion, the amount of exercise necessa ...
... In most of the published reports of the beneficial effect of carotid sinus pressure in angina pectoris, the anginal attacks were spontaneous and the usual duration of pain unknown. In the studies of Wayne and Laplace,8 although anginal attacks were induced by exertion, the amount of exercise necessa ...
Catheter Ablation for Cardiac Arrhythmias
... MP-2.083 Open and Thoracoscopic Approaches to Treat Atrial Fibrillation (MAZE and ...
... MP-2.083 Open and Thoracoscopic Approaches to Treat Atrial Fibrillation (MAZE and ...
Survival with full neurologic recovery and no cerebral
... history, standard of life, age, race, cardiac rhythm at collapse and location of cardiac arrest (21,22). Second, the health care system itself may affect CPR outcome fundamentally owing to differences in emergency medical services, response times, intensive care unit management and access to diagnos ...
... history, standard of life, age, race, cardiac rhythm at collapse and location of cardiac arrest (21,22). Second, the health care system itself may affect CPR outcome fundamentally owing to differences in emergency medical services, response times, intensive care unit management and access to diagnos ...
Pulmonary Artery Catheter Learning Package (Liverpool)
... Remove the needle. Make a small skin incision with the scalpel blade, at the point of entry of the guide wire. Insert the dilator through the haemostasis valve, and into the sheath. Thread the dilator/sheath/haemostasis valve assembly over the guide wire. Holding skin taut at the insertion site, adv ...
... Remove the needle. Make a small skin incision with the scalpel blade, at the point of entry of the guide wire. Insert the dilator through the haemostasis valve, and into the sheath. Thread the dilator/sheath/haemostasis valve assembly over the guide wire. Holding skin taut at the insertion site, adv ...
ACR-NASCI-SPR Practice Parameter for the Performance and
... include basic evaluation of the pericardium, heart size, and cardiac masses) and perform MR angiography (MRA). Their knowledge of structures beyond the heart provides added value in cardiac imaging. They already supervise MRI equipment performance, standard operating procedures, safety regulations, ...
... include basic evaluation of the pericardium, heart size, and cardiac masses) and perform MR angiography (MRA). Their knowledge of structures beyond the heart provides added value in cardiac imaging. They already supervise MRI equipment performance, standard operating procedures, safety regulations, ...
On the role of the pericardium in the Physioheart experimental setup
... As for the method used, this method was decided upon after several attempts to measure intrapericardial pressure in the intact pericardium (see Appendix). In stead of doing a tensile test on pericardial samples, it was chosen to stretch the pericardium over a rigid tube. A disadvantage of this metho ...
... As for the method used, this method was decided upon after several attempts to measure intrapericardial pressure in the intact pericardium (see Appendix). In stead of doing a tensile test on pericardial samples, it was chosen to stretch the pericardium over a rigid tube. A disadvantage of this metho ...
What is hypertrophic cardiomyopathy (HCM)?
... States (“stenosis” means obstruction). The same can be said for HOCM (hypertrophic obstructive cardiomyopathy) which is still widely used in the United Kingdom. Indeed, you may well hear your disease referred to by more than the designation … HCM. Presently, virtually all HCM experts and other cardi ...
... States (“stenosis” means obstruction). The same can be said for HOCM (hypertrophic obstructive cardiomyopathy) which is still widely used in the United Kingdom. Indeed, you may well hear your disease referred to by more than the designation … HCM. Presently, virtually all HCM experts and other cardi ...
life with dilated cardiomyopathy
... Not everyone who has dilated cardiomyopathy goes on to develop all the symptoms of heart failure. The symptoms usually come on slowly, but sometimes they can come on suddenly, for example, in the circumstances described on page 13. We describe these symptoms below. See the More information section o ...
... Not everyone who has dilated cardiomyopathy goes on to develop all the symptoms of heart failure. The symptoms usually come on slowly, but sometimes they can come on suddenly, for example, in the circumstances described on page 13. We describe these symptoms below. See the More information section o ...
a biphasic role for the voltage
... I’d also like to thank the members of my thesis committee, Al George, Charles Hong, Doug Mortlock, and the chair, Scott Baldwin. Their interest in my research and career are reflected heavily in my thesis. Leaving each committee meeting inspired and enthusiastic about my project was always encour ...
... I’d also like to thank the members of my thesis committee, Al George, Charles Hong, Doug Mortlock, and the chair, Scott Baldwin. Their interest in my research and career are reflected heavily in my thesis. Leaving each committee meeting inspired and enthusiastic about my project was always encour ...
Mechanism of reentry induction by a 9
... 0-V cathode) circular regions on the epicardial surface of the left ventricular (LV) free wall with diameters of 5 mm (anode) and 7 mm (cathode), separated by 13 mm, corresponding to a standard 9-V battery, as shown in Fig. 1, left. Sinus activation paced the ventricles via the PS at a fixed cycle l ...
... 0-V cathode) circular regions on the epicardial surface of the left ventricular (LV) free wall with diameters of 5 mm (anode) and 7 mm (cathode), separated by 13 mm, corresponding to a standard 9-V battery, as shown in Fig. 1, left. Sinus activation paced the ventricles via the PS at a fixed cycle l ...
Acute Effects of Right Ventricular Apical Pacing on Left Ventricular
... Methods and Results—A group of 25 patients with structural normal hearts referred for electrophysiological study were studied. Two-dimensional echocardiography was performed at baseline and during RV apical pacing at the time of the electrophysiological study. Changes in LV synchrony and mechanics ( ...
... Methods and Results—A group of 25 patients with structural normal hearts referred for electrophysiological study were studied. Two-dimensional echocardiography was performed at baseline and during RV apical pacing at the time of the electrophysiological study. Changes in LV synchrony and mechanics ( ...
lained severe pulmonary hypertension in ... H J. L.O.
... agent has resulted in a maintained haemodynamic benefit in some patients [29]. Some encouraging results with vasodilator treatment have also been reported [26, 30-32J although the therapy, as noted in our cases, has not generally provided a substantial decline in pulmonary arterial pressure in the l ...
... agent has resulted in a maintained haemodynamic benefit in some patients [29]. Some encouraging results with vasodilator treatment have also been reported [26, 30-32J although the therapy, as noted in our cases, has not generally provided a substantial decline in pulmonary arterial pressure in the l ...
English
... retrograde pattern through the collateral branches of the right coronary artery. The clinical manifestations result from myocardial ischemia and can be as follows: fatigue and crying when being fed, irritability, sweating, and paleness. The adult or mature form of anomalous origin of the left corona ...
... retrograde pattern through the collateral branches of the right coronary artery. The clinical manifestations result from myocardial ischemia and can be as follows: fatigue and crying when being fed, irritability, sweating, and paleness. The adult or mature form of anomalous origin of the left corona ...
Echocardiographic Evaluation of Ventricular Assist Devices
... These shunts may be at two levels, atrial or ventricular. A ventricular shunt occurs if there is a ventricular septal defect and these may occur following an acute myocardial infarction. It is important to detect these prior to VAD insertion, as they would require closure (usually with a pericardial ...
... These shunts may be at two levels, atrial or ventricular. A ventricular shunt occurs if there is a ventricular septal defect and these may occur following an acute myocardial infarction. It is important to detect these prior to VAD insertion, as they would require closure (usually with a pericardial ...
Pacemaker Therapy - Boston Scientific
... your body. Normally these signals come from a small area in your heart called the sinoatrial (SA) node. This area is located in the upper right chamber, or right atrium. When the SA node signals reach the two upper chambers of the heart (the atria), they contract at the same time. The atrial contrac ...
... your body. Normally these signals come from a small area in your heart called the sinoatrial (SA) node. This area is located in the upper right chamber, or right atrium. When the SA node signals reach the two upper chambers of the heart (the atria), they contract at the same time. The atrial contrac ...
Inhibition of cyclooxygenase-2 improves cardiac - AJP
... placed near its origin at the edge of the left atrium as described previously (15). Ligation was deemed successful when the anterior wall of the left ventricle (LV) turned pale. The ligature was positioned so as to produce a moderate infarct (30–45%). Sham operation was identical except that the lig ...
... placed near its origin at the edge of the left atrium as described previously (15). Ligation was deemed successful when the anterior wall of the left ventricle (LV) turned pale. The ligature was positioned so as to produce a moderate infarct (30–45%). Sham operation was identical except that the lig ...
Print - Circulation Research
... Balloon inflation and deflation were effected with compressed air and a vacuum pump, respectively. A previously described timing circuit14 connected to a solenoid valve controlled the duration of inflation and deflation. If ventricular fibrillation occurred, attempts were always made to defibrillate ...
... Balloon inflation and deflation were effected with compressed air and a vacuum pump, respectively. A previously described timing circuit14 connected to a solenoid valve controlled the duration of inflation and deflation. If ventricular fibrillation occurred, attempts were always made to defibrillate ...
cardiovascular magnetic resonance in the prediction of outcome
... presence of either CMR-TSI >110ms or PL scar resulted in a worse outcome, whilst the presence of both was associated with the highest mortality. A final study in 148 patients allowed the development of a risk score to predict mortality from CRT on the basis of 16 candidate variables. PL scar, dyssyn ...
... presence of either CMR-TSI >110ms or PL scar resulted in a worse outcome, whilst the presence of both was associated with the highest mortality. A final study in 148 patients allowed the development of a risk score to predict mortality from CRT on the basis of 16 candidate variables. PL scar, dyssyn ...
Gated blood pool SPECT improves reproducibility of right and left
... (FPA) in radionuclide ventriculography, allows the quantitative analysis of ventricular contractile synchrony. However, FPA reproducibility using gated blood pool SPECT (GBPS) has not been fully evaluated. The present study evaluates whether by using GBPS, the reproducibility of FPA could be improve ...
... (FPA) in radionuclide ventriculography, allows the quantitative analysis of ventricular contractile synchrony. However, FPA reproducibility using gated blood pool SPECT (GBPS) has not been fully evaluated. The present study evaluates whether by using GBPS, the reproducibility of FPA could be improve ...
Surgery for Atrial Fibrillation
... pulmonary vein orifices, discordant activation of neighboring atrial segments across the incisions, delayed activation at the lateral left atrium, and interrupted atrial coronary arteries. The radial procedure,8) in which the atrial incisions radiate from the sinus node toward the atrioventricular a ...
... pulmonary vein orifices, discordant activation of neighboring atrial segments across the incisions, delayed activation at the lateral left atrium, and interrupted atrial coronary arteries. The radial procedure,8) in which the atrial incisions radiate from the sinus node toward the atrioventricular a ...
Chronic vagus nerve stimulation improves left ventricular function in
... the Care and Use of Laboratory Animals published by the US National Institutes of Health (NIH Publication, revised 1996) and was approved by the animal research committee of Fuwai hospital, Peking Union Medical College. Mitral valve regurgitation was induced by chordae rupture using a fluoroscopic g ...
... the Care and Use of Laboratory Animals published by the US National Institutes of Health (NIH Publication, revised 1996) and was approved by the animal research committee of Fuwai hospital, Peking Union Medical College. Mitral valve regurgitation was induced by chordae rupture using a fluoroscopic g ...
Cardiac function in hereditary transthyretin amyloidosis
... Methods: A total of 122 ATTR amyloidosis patients that had undergone thorough echocardiographic examinations were included in the studies. Analyses of ventricular geometry as well as assessment of systolic and diastolic function were performed, using both conventional echocardiographic methods and s ...
... Methods: A total of 122 ATTR amyloidosis patients that had undergone thorough echocardiographic examinations were included in the studies. Analyses of ventricular geometry as well as assessment of systolic and diastolic function were performed, using both conventional echocardiographic methods and s ...
Closed-loop cardiac pacing vs. conventional dual
... their social and working life.3 – 7 Some initial, uncontrolled, follow-up studies8 – 11 as well as subsequent, randomized, controlled trials12 – 14 have suggested that, ...
... their social and working life.3 – 7 Some initial, uncontrolled, follow-up studies8 – 11 as well as subsequent, randomized, controlled trials12 – 14 have suggested that, ...
Feasibility and effect of para-right bundle branch pacing in patients
... Background: Chronic right ventricular apex (RVA) pacing can induce negative clinical effects. The aim of the present study was to compare RVA pacing with para-right bundle branch (para-RBB) pacing in terms of electrocardiogram (ECG) and echocardiographic (ECHO) features. Methods: Forty-one consecuti ...
... Background: Chronic right ventricular apex (RVA) pacing can induce negative clinical effects. The aim of the present study was to compare RVA pacing with para-right bundle branch (para-RBB) pacing in terms of electrocardiogram (ECG) and echocardiographic (ECHO) features. Methods: Forty-one consecuti ...
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.