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[i]Shortly after docking with the Command Module at 178 hours ground elapsed time (GET), the Lunar Module Pilot experienced five ventricular prematurities in a 30-second period. Approximately one hour later at 179:07 GET, while the crewmen were observing the Lunar Module tunnel leak rate in their couches, the Lunar Module Pilot suddenly converted from normal sinus rhythm to a nodal bigeminal rhythm. During the 14 seconds in which the abnormal rhythm persisted, a total of eleven coupled beats were observed. The Lunar Module Pilot s heart rate preceding and during the arrhythmia was approximately 95 beats per minute. One and one-half minutes prior to onset of the bigeminal rhythm, his heart rate had peaked at 120 beats per minute for a 20-second period. Following this bigeminal episode, the Lunar Module Pilot experienced approximately ten additional premature atrial contractions during the time he was monitored over the next 60 hours of the mission. The last atrial prematurity in the Lunar Module Pilot was observed at 240:24 hours GET. The Lunar Module Pilot's premature ventricular contractions, however, persisted at the previously cited rate of one to two per hour.[/i]
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