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What does A2 stand for?

A2 stands for atrial extrastimulus

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Antegrade AV node conduction curves were drawn from the results of programmed atrial extrastimulus testing. 5 Dual-pathway physiology was characterized by a jump (=50 ms) in H1-H2 or H2-H3 at a critical range of A1-A2 or A2-A3 coupling intervals (10-ms decrease) that resulted in a discontinuity between the portion of the curve to the right of the jump in H1-H2 or H2-H3 (fast pathway conduction) and the portion of the curve to the left of the jump (slow pathway conduction).
Baseline PR interval was 161 msec. AH and HV intervals were within normal limits. A narrow complex tachycardia (SVT) was easily inducible by ventricular decremental pacing as well as ventricular burst pacing. It was also easily inducible by atrial or coronary sinus burst pacing or atrial extrastimulus testing. During atrial extrastimulus testing, tachycardia initiation was dependent on a critical AH interval prolongation with an H-V-A initiation pattern (Figure 2).
Christenson, S. D. Olshansky, B. Shivkumar, K. Unusual response to atrial extrastimulus.