The author studied the state of intracardiac hemodynamics, contractile and diastolic function of the heart in patients with hypertensive disease (stage II) depending on the index of the double cardiometric product reflecting the heart sizes. It was established that disorders of the cardio- and hemodynamics in patients with hypertensive disease depend not only on the stage of the disease but also on the degree of hypertrophy of the left cardiac ventricle and sizes of the heart. Groups of patients are distinguished with a different level of exertion of the adaptation-compensation mechanisms at rest and level of functional myocardial insufficiency. The proposed index enables to evaluate the physical working capacity without ergometric examination.