Figure: ECG Mobitz type 2 second degree AV block

Introduction

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          Male     BP 145/55

PR:  299
QRS:  80      Sinus rhythm. Atrial rate @ 80/min. Ventricular rate @ 40/min
QT:  596      2nd degree AV block.  PR > 220 mS.
QTc: 486

 Axes        QT interval long for rate.

P:    59
QRS: -13
T:    67

Second degree type 2 AV block. Failure to conduct every other depolarization through the AV node.