Clinical significance of XXXX induced by ventricular programmed stimulation.

@entity1 @entity1165 @entity944 @entity1163 @entity299 @entity2224 @entity1167
Two hundred twenty-four @entity1 underwent ventricular programmed stimulation (VPS) without prior documentation of the clinical occurrence of sustained @entity1165 ( @entity1165 ) or @entity2224 ( @entity2224 ). Indications for VPS were: palpitations or nonsustained @entity1165 during ambulatory monitoring (85 @entity1 ), @entity1163 or @entity1163 (137 @entity1 ), and a family history of @entity944 (two @entity1 ). @entity2224 requiring transthoracic defibrillation was initiated by VPS in 18 @entity1 (8.0%). Four @entity1 were treated for inducible @entity2224 with antiarrhythmic agents directed by electropharmacologic testing; five @entity1 were treated empirically; nine @entity1 received no therapy. No @entity1 has had a @entity1167 or @entity944 during a follow-up period 25.2 +/- 13.8 months (mean +/- standard deviation). @entity2224 was initiated by two ventricular extrastimuli in three @entity1 and by three extrastimuli in 15 @entity1 . The incidence of @entity2224 was similar in @entity1 with and without previous symptoms (8.8% vs 6.9%) or @entity299 (7.1% vs 9.6%). It was significantly higher when VPS at three ventricular sites with a current of 5 mA (pulse width 2 msec) was compared to programmed stimulation at two ventricular sites with a current twice diastolic threshold (pulse width 2 msec) (15.2% vs 3.0%, p less than 0.05). @entity2224 initiated by VPS in @entity1 without prior @entity1165 or @entity2224 appears to be a nonspecific finding. Antiarrhythmic therapy for @entity2224 may not be necessary in these @entity1 .
