1
Q
Regular Rhythm
Prolonged (>0.20 large square) PR Interval
Slowed conduction through AV node (but no missed beat)
A
1st degree block
2
Q
Irregular rhythm with progressively lengthening PR interval until a QRS complex is dropped.
Normal QRS
A
2nd degree heart block Mobitz-type 1 (Wenkebach)
3
Q
QRS complexes dropped without PR prolongation
A
2nd degree block-Mobitz Type II
4
Q
No beats conducted through to ventricles.
AV dissociation, in which atria and ventricles driven by independent pacemakers.
P waves appear to “march through” QRS complexes (atrial rate faster than ventricular rate)
A
Third Degree block
EKG Rhythms
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