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Transcript 
Atrioventricular (AV)
Heart Block
Chapter 17
Classification of AV
Heart Blocks
Degree
AV Conduction Pattern
Uniformly prolonged PR
Degree Block
interval
Progressive PR interval
nd
2 Degree, Mobitz Type I
prolongation
2nd Degree, Mobitz Type
Sudden conduction failure
II
1St
3rd Degree Block
No AV conduction
First Degree Block
• prolonged PR interval
Second Degree AV
Block
• Mobitz type I or Winckebach
• Mobitz type II
Mobitz Type I
Mobitz Type I
• Progressive lengthening of the PR
interval from beat to beat until a beat is
dropped.
• The PR interval after the nonconducted
P wave is shorter than the PR interval
before the nonconducted P wave.
Mobitz Type II
Mobitz Type II
• Sudden appearance of a single, nonconducted sinus P wave...
• ...without...
• ...the progressive prolongation of the
PR intervals…
• ...and the shortening of the PR
interval in the beat after the
nonconducted P wave.
Advanced SecondDegree AV Block
Two or more consecutive nonconducted sinus P waves
Third-Degree
(Complete) AV Block
Third-Degree
(Complete) AV Block
• P waves are present, with a regular
atrial rate faster than the ventricular rate
• QRS complexes are present, with a
flow (usually fixed) ventricular rate
• The P wave bears no relation to the
QRS complexes, and the PR intervals
are completely variable
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