[Changes in the hemodynamics and phase structure of the cardiac cycle in the early postoperative period in patients with lung, esophageal, stomach and rectal cancers].

Early postoperative changes in cardiac hemodynamics were studied in 222 patients with cancer of the lung, esophagus, stomach and rectum. They took form of operative stress--associated sympathoadrenal stimulation of the heart, such as tachycardia, shorter period of isometric contraction, increased dP/dt and hyperdynamic syndrome. In cases of radical surgery, the said disorders were accompanied by decreased circulating blood and stroke volumes and, in most patients, by lowered cardiac output and blood pressure matched by enhanced peripheral vascular resistance. The said disturbances were more pronounced and persisted longer in cases of combined treatment, patients aged over 60 years and those with preexisting heart pathology. A correlation was established between the extent of these disorders, on the one hand, and blood loss and sympathoadrenal system response to operative stress, on the other.