The role of the signal-averaged ECG was prospectively assessed in 517 @entity1 in whom there was a suspicion for @entity943 . @entity1 were divided into Group I with a normal surface QRS width less than 120 ms (426 @entity1 ) and Group II with a prolonged QRS duration greater than or equal to 120 ms (91 @entity1 ). Late potentials were present in 42 (10%) Group I @entity1 and in 24 (26%) Group II @entity1 . Programmed ventricular stimulation was performed for standard indications in 55 @entity1 without late potentials and in 42 @entity1 with late potentials, combining both groups. The @entity944 or recurrent sustained @entity1165 rate in follow-up was evaluated based on the presence or absence of late potentials and whether programmed ventricular stimulation was performed. In the @entity1 without late potentials, these rates were 4 @entity1 (1.0%) in the no EP group and 3 @entity1 (5.5%) in the EP group (p less than .05), respectively (overall 1.6%). In the @entity1 with late potentials, these rates were 7 @entity1 (29%) in the no EP group and 7 @entity1 (17%) in the EP group (p = .19), respectively (overall 21%). In addition, appropriate @entity1457 were present in 1 @entity1 without late potentials and in 8 @entity1 with late potentials which were not included in the recurrent @entity944 or sustained @entity1165 statistics. The signal-averaged ECG accurately defines @entity1 at a higher risk for @entity943 regardless of unfiltered QRS duration.(ABSTRACT TRUNCATED AT 250 WORDS)

Prospective community evaluation of the signal-averaged electrocardiogram in predicting XXXX : beneficial outcome with electrophysiology guided therapy.

@entity1 :: ('9606', 'Species') :: ['Patients', 'patients', 'patient'] @entity1165 :: ('MESH:D017180', 'Disease') :: ['ventricular tachycardia'] @entity944 :: ('MESH:D003645', 'Disease') :: ['sudden death'] @entity1457 :: ('MESH:D012769', 'Disease') :: ['automatic defibrillator shocks'] @entity943 :: ('MESH:D001145', 'Disease') :: ['malignant ventricular arrhythmias']
@entity943 :: (MESH:D001145,Disease) :: ['malignant ventricular arrhythmias']
