Recognition of type 1 second degree atrial ventricular block during incomplete atrial ventricular dissociation in acute inferior myocardial infarction.

Type 1 (Wenckebach) atrial ventricular blocks and accelerated junctional rhythms occur frequently and early in acute inferior myocardial infarction. Combined they present a puzzling arrhythmia. A systematic approach to interpretation and recognition of the RP interval is the critical determinant for conduction. Correct evaluation of these arrhythmias prevents unnecessary therapy.