[Extracardiac regulation of cardiac rhythm in thyroid diseases]

Extracardiac control of the cardiac rhythm in various diseases of the thyroid gland depending on its functional activity was studied on the basis of mathematical and statistical indices of cardiac rhythm and excretion of adrenalin and noradrenaline in the urine. Considerable activation of central and inhibition of the autoregulation contour was revealed in thyrotoxicosis, with attendant simultaneous increase in circadian adrenalin and noradrenaline excretion. No marked changes in extracardiac control of cardiac thythm were noted in patients with cancer of the thyroid gland, chronic thyroiditis and euthyroid goiter with normal function of the thyroid gland.