Clinical studies on apexcardiogram. II. Cardiac movement in thyroid dysfunction and coronary heart disease from the point of apexcardiogram.

Abstract

The changes of ACG (Apexcardiogram) in patients with thyroid dysfunction and coronary heart disease were reported. Peculiar findings of ACG in hyperthyroidism, were short Isometric Contraction Time (ICT), lower Mid Ejection Height (MEH), and Diastolic Filling Wave Ratio (DFWR), on the contrary, longer ICT, higher MEH, DFWR, and wide A wave were observed in hypothyroidism. More rapid outward and in-ward movement of the chest wall in hyperthyroidism was revealed from the finding of small MEH in it. Difference of contraction rather than relaxation seems to be more remarkable in cardiac movement in patients with thyroid dysfunction. ICT and IRT were prolonged in arteriosclerosis and coronary heart disease. A wave was prominent in these groups, especially in the latter. Prominent A wave was observed on the anginal episode in aortic insufficiency and hypoxic condition in coronary heart disease. This elevation of the A wave was inhibited by nitroglycerin in both patients. Possible mechanism producing a dominant A wave was discussed from the standpoint of venous return and left ventricular function.