The cyclic nucleotides (CN) system and Ca2+ content were examined in children with various heart rhythm disorders (HRD). Marked changes were demonstrated which correlated to clinical manifestations of the arrhythmias: their type, phase, duration and favorable changes in their course. Antiarrhythmic therapy was associated with a normalization of the altered levels of cyclase components and Ca2+. The results suggest that intracellular metabolism regulation may be disrupted in HRD cases and play an important role in the development of arrhythmias.
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