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Continue to ChatCase B5. Second Degree AV Block: Mobitz Type I or Wenckebach Block. St Emlyn's ECG Library https://www.stemlynsblog.org/ecg-library-st-emlyns/case-b5-second-degree-av-block-mobitz-type-i-or-wenckebach-block-st-emlyns-ecg-library/