ATRIAL TACHYCARDIA FROM ABOVE THE SEMILUNAR VALVES

Case presented by:

RAMPRAKASH BALASUNDARAM, MD AND CALAMBUR NARASIMHAN, MD

Question No. 1: In the patient with ectopic AT shown in Figure 12.1, the most likely focus is on:

A.Noncoronary sinus.

B.Left pulmonary vein (PV).

C.Superior mitral annulus (SMA).

D.Coronary sinus (CS) ostium.

E.Atrial septum.

Discussion

When P waves during a tachycardia merge with the T wave, introducing premature ventricular complexes brings out the P waves better, as in this case . Morphology of P waves helps focus the mapping efforts to the area of interest.

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