Abstract
A 42-year-old woman with a 2-year history of paroxysmal supraventricular tachycardia was referred for electrophysiologic study. The patient had a normal baseline ECG and no structural heart disease. Baseline sinus cycle length, atrial-His (AH), and His-ventricular (HV) intervals were 778, 77, and 45 ms, respectively. A narrow QRS complex tachycardia with inverted P waves in the inferior leads was reproducibly induced by programmed stimulation with a single atrial extrastimulus (Figure 1). During tachycardia (cycle length 350 ms), the shortest HA and AH intervals were 140 and 210 ms, respectively.
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