[Hyperventilation as a method of detecting atrioventricular conduction disorders in athletes]

A hyperventilation test, rationed with respect to respiratory rate and duration, was performed in 140 athletes under electrocardiographic control. During the test, one athlete developed an episode of sino-auricular block, and four showed a temporary second-degree Wenkebach--Samoilov A--V block. In three of those, resting ECG demonstrated decelerated atrioventricular conductivity which was combined with signs of myocardial dystrophy in two cases and with periodically recorded coronary sinus rhythm in one. Two athletes were under long-term dispensary observation. When repeated tests were negative, the block developed in response to hyperventilation preceded by obsidan administration.