[The biological rhythms of cardiac activity based on cardiointervalography in children with rheumatism during readaptation after sanatorium treatment].

Heart rate as an integral characteristic of systemic condition in rheumatism was studied in 11-13-year-old children with rheumatic heart disease. The children achieved remission by clinical and laboratory tests and were experiencing postsanatorium readaptation. Pretreatment amplitude of the fluctuations from the mean circadian values were reduced in the patients compared to healthy controls. This shows low compensatory potential of the rheumatic children. Adaptation after sanatorium treatment aggravates the above amplitude diminution, acrophases shifted to later local time.