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[End-systolic pressure-volume relationships obtained by conductance catheter and transient inferior vena caval occlusion: their clinical usefulness].

Abstract：

:Whether beneficial hemodynamic effects of cardiovascular drugs are due to changes in the inotropic or loading conditions has been difficult to determine in clinical settings. In this study, the end-systolic pressure-volume relationship, known as a load-independent measurement of cardiac contractility, was obtained by a volumetric conductance catheter and transient inferior vena caval occlusion. We applied this technique to determine the major mode of hemodynamic action of a new inotropic vasodilator, OPC-8490, in comparison to that of dobutamine. In 7 patients with anterior myocardial infarction, an 8F conductance catheter with pressure micromanometer was inserted into the left ventricle. Absolute volume calibration was accomplished by injection of hypertonic saline into the pulmonary artery. Left ventricular pressures and volumes were simultaneously and continuously measured during transient inferior vena caval occlusion using a balloon catheter. Left ventricular end-systolic pressure-volume relationships were determined during the initial 8-sec of balloon occlusion, before baroreceptor-mediated cardiac stimulation was initiated. OPC-8490 decreased both the left ventricular systolic pressure and end-systolic volume without changing the heart rate. Dobutamine increased the systolic pressure and heart rate but decreased the end-systolic volume. The reduction in the end-systolic volume with dobutamine, was caused by an increase in the slope of the end-systolic pressure-volume relationship, while with OPC-8490, it resulted from a decrease in the end-systolic pressure without an appreciable change in the slope of the end-systolic pressure-volume relationship.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

J Cardiol

journal_title

Journal of cardiology

authors

Kameyama T,Asanoi H,Ishizaka S,Nozawa T,Fujita M,Sasayama S

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

473-80

issue

2

eissn

0914-5087

issn

1876-4738

journal_volume

21

pub_type

杂志文章

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