[Various features of the clinical picture and central hemodynamics of patients with the sick sinus syndrome].

The authors examined 33 coronary heart disease patients with the syndrome of pacemaker weakness (SPW) aged 54 to 82 years. In 18 of the patients the clinical and electrocardiographic manifestations of the SPW were intermittent and appeared simultaneously with exacerbation of coronary heart disease. Patients with the SPW but without a history of myocardial lesions displayed the hyperdynamic type of the circulation. Even with normal and elevated parameters of the central hemodynamics they showed decreased adaptational capabilities of the body in relation to exercise. The development of circulatory insufficiency in the SPW to a large extent stems from myocardial lesions following the previous heart disease.