[Hyperthyroidism and its relation to heart function].

The influence of hyperthyreosis on the cardiac function was investigated by means of non-invasive methods (radiocardiography, echocardiography, Tc-99m- und Tl-201-scintigraphy of the myocardium) and invasive methods (coronary angiography). Independent of age an increase of the frequency was always existing, a significant increase of the filling of the ventricle, of SI and HI was shown only by younger patients. With the help of the echocardiography local and global disturbances of kinetics, by means of the Tl-201-scintigraphy of the myocardium disturbances of the myocardial perfusion could be proved. For the circulating plasma catecholamines noradrenalin, adrenalin and dopamine values were established lying in the lower region of the normal. The effects of an increase of the thyroid hormone on the number and/or sensitivity of the membrane-bound beta-adrenoceptors of the heart as well as the independent of its effect of the SDH on the obtaining of myocardial energy are discussed.