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First Degree AV Block

– usually a slow conduction of the impulse by the AV node.

– the PR interval is lengthened.


  • Ventricular:  normal
  • Atrial: normal


  • R-R Interval: Regular
  • P-P Interval: Regular


  • PR Interval: > or = .20
  • QRS Complex:  .6- .10

First Degree AV Block

– usually asymptomatic

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