[The function of the thyroid and thyrotropic function in patients with chronic ischemic heart disease and rhythm disorders].

Measured in 119 patients with chronic heart disease (exercise-induced angina in 62, cardiosclerosis in 57 cases) presenting with arrhythmias (extrasystolic arrhythmia, permanent form cardiac fibrillation, association of cardiac fibrillation with ventricular arrhythmia, with n = 58, 38, 23 respectively) were blood levels of thyroid-stimulating hormone (TSH), triiodothyronine (T3) and thyroxin (T4) using immunoradiometric assay. In extrasystolic arrhythmia, permanent form cardiac fibrillation, there were no deviations from the norm in the basal TSH blood levels, reduction in (T3) as well as augmentation of (T4) in cardiac fibrillation. With permanent form cardiac fibrillation associated with ventricular arrhythmia the TSH blood level got decreased, the (T3) and (T4) content undergoing no changes The posttreatment blood content of (T3) tended to augment in extrasystolic arrhythmia.