During 1981-1984, a total of 52 airpersonnel had 24-h continuous ambulatory electrocardiographic (ECG) monitoring at the Israel Air Force Aeromedical Center because of an incidental finding of a first or second degree atrio-ventricular block on a resting 12-lead ECG. There were 230 other airpersonnel without AV block on the resting ECG monitored during the same period. Altogether 17 cases of second degree Mobitz type I (Wenckebach) block were identified. Mobitz type I was detected on Holter monitoring in 2 (0.9%) of the 230 cases with a normal PR interval on the resting ECG, in 6 (15.4%) of 39 cases with a PR interval of 0.22-0.25 s, in 5 (55.5%) of 9 cases with a PR interval of 0.26 s or more, and in all 4 cases with Mobitz type I on the resting ECG. It is concluded that the PR interval on the resting ECG may be useful in predicting an intermittent Mobitz type I AV block on Holter monitoring.
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