Calibrated Low Frequency Acceleration Vibrocardiography:Its Hemodynamic Determinants and Clinical Application

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概要

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• Calibrated low frequency acceleration vibrocardiography (A-VCG) was studied in normal individuals and in patients with coronary heart disease. Experimental studies in anesthetized dogs were also made to look for the hemodynamic determinants of the main waves in the A-VCG, and transmission characteristics of the chest wall over the range of the frequency of the A-VCG. The results were as follows:(1) The S wave of low frequency acceleration vibrocardiography (A-VCG) coincided with the upward slope of the aortic flow rate curve, but showed a reverse phase, and its trough coincided with the vertex of the first derivative of aortic flow rate.(2) The amplitude of the S wave was correlated with the peak value of aortic flow rate, the peak value of the first derivative of aortic flow rate and the peak value of the first derivative of aortic pressure, but was not correlated with aortic pressure, stroke volume and the peak value of the first derivative of left ventricular pressure.(3) In the patients with myocardial infarction, there was a significant increase in A wave amplitude, decrease in S wave amplitude and increased A/S ratio compared with those of normal individuals.(4) In the patients with angina pectoris, there was a significant increase in A/S ratio compared with that of normal individuals with the age of between 30 and 39.(5) In normal individuals, there was tendency for A wave amplitude to increase, S wave amplitude to decrease and A/S ratio to increase with age.(6) During exercise and inhalation of amyl nitrite, increase in S wave amplitude was smaller in the patients with angina pectoris than in normals.(7) These results suggest that the S wave amplitude in A-VCG reflects contractility of the left ventricle, and that the A/S ratio and changes in S wave amplitude during various conditions offer useful means for detecting latent impairment of the functional reserve of left ventricle.(8) The wave form and phase of direct A-VCG from the ventricular wall and those from the chest wall were similar, and the S wave amplitude was about 6dB greater in direct A-VCG.

• International Heart Journal刊行会の論文

著者

• MATSUZAKI Tadashi

  First Department of Internal Medicine, Faculty of Medicine, University of Tokyo

• Matsuzaki Tacashi

  First Department of Internal Medicine, Faculty of Medicine, University of Tokyo

関連論文

• Calibrated Low Frequency Acceleration Vibrocardiography:Its Hemodynamic Determinants and Clinical Application

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