[Response to the orthostatic test in patients with macrofocal myocardial infarct under different tempo of...

In 68 patients with large-focal myocardial infarction subjected to different tempos of activization the orthostatic test was conducted while assuming the vertical position for the first time and prior to being discharged from the hospital. Orthostatic complications and changes in the terminal part of the ventricular complex on ECG were found to be much more frequent in cases of slow tempo activation. A qualitatively different response to the orthostatic test was revealed in myocardial infarction patients with or without circulatory insufficiency. In those with signs of circulatory insufficiency the acceleration of the cardiac contractions rate in the orthostatic position, the shortening of the ejection phase, the reduction of the rheographic amplitude in the lungs and the lower extremities were negligible in comparison with those free of circulatory insufficiency and having statistically significant shifts in the above parameters. The patients with circulatory insufficiency tended to a greater increase of the diastole-systolic ratio of the lower extremities rheogrammes which proves a hindered outflow of blood from this vascular zone. Faster tempos of activization, even in the presence of circulatory insufficiency, helped to prevent the above shifts.