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First Degree Heart Block

EKG Reference
First Degree Heart Block
RhythmRegular
RateThe underlying rate
P WaveNormal
PR IntervalProlonged (>0.20 sec)
QRSNormal (0.06-0.10 sec)
NotesA first degree AV block occurs when electrical impulses moving through the Atrioventricular (AV) node are delayed (but not blocked). First degree indicates slowed conduction without missed beats.

First Degree Heart Block EKG Tracing


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