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Initiation of an atrioventricular nodal reentry tachycardia.

Initiation of an atrioventricular nodal reentry tachycardia.
Initiation of an atrioventricular nodal reentry tachycardia.

There is an abnormal P wave (P′) and atrioventricular nodal delay (long P′R interval) before onset of the tachycardia.