Results of a study into the myocardium function in 440 patients with ischemic heart and hypertensive diseases are presented. In the study poly-kineto-apex-cardiography, rheography of the aorta and lungs, ultrasonic cardiography at rest in 123 of 440 patients were used after veloergometric loading. The application of the mentioned methods in conjunction with the veloergometric test helped diagnose a latent cardiac insufficiency that proved most frequent among patients with myocardial infarction in their past history (84.5%) and among those suffering from hypertensive disease with prevalence of the cardiac syndrome. An inference is drawn on the need for a complex investigation of patients at the clinic and especially in the practice of the medical expert testimony on the work capacity.