[Functional state of the myocardium during transesophageal cardiac pacing in patients with ischemic heart disease selected for surgical treatment based on nuclear stethoscope findings].

A nuclear stethoscope was used to examine central hemodynamic parameters and myocardial contractility in 70 patients with coronary heart disease (CHD). The findings were analyzed according to the degree of cicatricial changes in the myocardium and coronary atherosclerotic lesion. The patients, unlike apparently healthy individuals, were found to show an increase in systolic cardiac output and a decrease in left ventricular ejection fraction in response to transesophageal cardiac pacing. As the cicatricial changes in the myocardium became profound, the maximum left ventricular performance decreased mainly due to the myocardial factor, while there was a reduction in the chronotropic reserve along with relatively slight signs of myocardial dysfunction when coronary atherosclerotic lesion progressed.