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Second Degree Type 1 AV Block

Description

This is a classic example of second degree type 1 AV block (Mobitz Type 1 or Wenckebach phenomenon). The rhythm is normal sinus rhythm at a rate of 64/min. There is progressive lengthening of the PR interval following the second through the fifth P waves. The sixth P wave is not conducted. The cycle then appears to be repeated with the seventh through twelfth P waves.

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