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Second Degree AV Block

–   “Wenckenbach” also is called.

– often seen after a myocardial infarction

– the PR interval is getting progressively longer until one P wave is not followed by an QRS complex.


  • Ventricular:  slow
  • Atrial: greater than ventricular


  • R-R Interval: irregular
  • P-P Interval: irregular


  • PR Interval: normal or prolonged
  • QRS Complex:  Normal



Second Degree AV Block  (Mobitz Type)

– ♣ Can lead to cardiac arrest or V Fib.

– paroxysm of 3 beats or more.

– Prepare patient for cardioversion.


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