Regulation of Ventricular Contraction

Regulation of ventricular contraction by the carotid sinus. Its effect on atrial and ventricular dynamics.

A N understanding of the control of cardiac output by the organism is perhaps one of the most important objectives to Avhich an investigator in circulatory physiology can aspire. An evaluation of those influences which can, at any given heart rate, augment or diminish the external work and power produced by the ventricle is basic to the problem. The more systematic organization of the dynamic e...

Abnormal Left Ventricular Contraction

Twenty-five patients with pure mitral stenosis and nine normal subjects were studied by selective left ventricular cineangiocardiography. Left ventricular volumes were measured at end systole, throughout diastole, and at end diastole. Although filling curves showed that the left ventricles filled slowly in patients with mitral stenosis, normal end-diastolic volumes were attained provided diasto...

Augmentation of Left Ventricular Contraction

In order to assess potential improvement in abnormal left ventricular (LV) wall motion, eighteen subjects sixteen with obstructive coronary artery disease and LV asynergy and two with no evidence of organic heart disease were studied by cardiac catheterization and cineangiography. Ventriculograms were performed at rest and during a constant infusion of l-epinephrine (EPI) at 1-4 ,gg/min after a...

Regulation of the degree of emptying of the left ventricle by the force of ventricular contraction.

Results iire presented which indicate that left ventricular end-systolic volume is determined by the force-length relationship of the ventricular muscle at the end of systole. In other words the muscle continues to shorten until it meets a certain force the magnitude of which depends on the length of the muscle fibers tit that time; when it meets this force it shortens no further. Since the end...

Regulation of ventricular contraction. Influence of cardiac sympathetic and vagal nerve stimulation on atrial and ventricular dynamics.