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This strip is classic for Wenckebach or Mobitz I second-degree AV block. We see a pause at the start and then a normal PR interval. The PR then begins to lengthen progressively throughout the rest of the group. Finally, the group terminates with a blocked P wave. The R-R interval shortens at the beginning of the group and then the shortening levels out, which is a bit atypical. The pause is less than the sum of two P-P intervals.
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