PSEUDO LATE POTENTIALS UNMASKED BY SPECTROCARDIOGRAPHY

We present a patient with chronic obstructive pulmonary disease and su stained ventricular tachycardia in the setting of unstable coronary ar tery disease. Signal-averaged ECG (SAECG), inadvertently performed dur ing an atrial tachycardia with 2:1 atrioventricular (AV) block, was ab normal by time-domain analysis, but was normal by a relatively new fre quency analysis technique of the entire QRS (spectocardiography). The patient was noninducible for sustained ventricular arrhythmias. Follow ing cardioversion to sinus rhythm, SAECG was normal by time-domain ana lysis and spectrocardiography. This technique may show promise in the management of patients who are at risk for sustained ventricular arrhy thmias, particularly those who cannot be evaluated by time-domain anal ysis.