Atrial tachycardia secondary to sino-atrial node reentry.

In one patient reprodncibk episodes of sMal tachyear(200 msec, control; 70 msec, atropine) and sustained dia conld be elicited via programmed atrial premature atrial tachycardia no longer could be elicited. These dcpoluizations. Evllodion of the elechpphysiologic studies mpport the concept that h a t t i a l reciprocation shldks suggested that the most tikely mechanism was can be a mechanism responsible for atrial tacharrhythdm-athd miprocation. Intmvmom atropine prodnced mins in mau. a pronomced shortening of do-atrial conduction time