[A spectral analysis of the cardiac rhythm in children with cardiovascular diseases living in areas under radiation control].

Spectral analysis of cardiac rhythm has determined characteristics of humoral, sympathetic and parasympathetic regulation in children with cardiac abnormalities and thyroid hyperplasia. The examinees demonstrated low activity of humoral immunity, high sympathetic influences, slight variability of frequency-amplitude characteristics. Sanatorium treatment improved regulation of cardiac activity. Spectral analysis of cardiac rhythm proved efficient for optimization of physiotherapy.