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Second degree AV block type I Second Degree AV Block Type I - Wenkebach (Example 1) Second Degree AV Block Type I - Wenkebach (Example 2) In 2nd degree AV nodal block (a.k.a. Wenkebach block or Mobitz Type I AV block), varying failure of conduction through the AV node occurs such that some P waves may not be followed by a QRS complex. Unlike 1st degree AV nodal block, a 1:1 P wave to QRS complex ratio is not maintained. Specifically,. 2nd degree AV block type I is characterized by progressingly increasing delay of AV nodal conduction until a P wave fails to conduct through the AV node. Thus, the PR interval becomes progressively longer from beat-to-beat until a P wave is not conducted. |
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