BACKGROUND: Increased ventricular pacing thresholds have been observed following monophasic implantable cardioverter defibrillator (ICD) shocks. AIM: To examine changes following high-energy biphasic shocks delivered by integrated bipolar ICD systems. METHOD: Ten episodes of ventricular fibrillation (VF) were induced at 10 min intervals in nine pigs with integrated ICD systems. After 10 s of each episode of VF, a 40 J biphasic shock was delivered, which successfully terminated VF (a total of 10 shocks). The bipolar pacing threshold at the right ventricular apex was measured before each shock and at 1 min intervals after each shock. RESULTS: The mean pacing threshold was 0.029+/-0.059 muJ before the first shock and gradually increased to 0.14+/-0.10 muJ after the 10th shock. CONCLUSION: It may be necessary to pace at a high-voltage output following biphasic shocks delivered by integrated bipolar ICD systems.
BACKGROUND: Increased ventricular pacing thresholds have been observed following monophasic implantable cardioverter defibrillator (ICD) shocks. AIM: To examine changes following high-energy biphasic shocks delivered by integrated bipolar ICD systems. METHOD: Ten episodes of ventricular fibrillation (VF) were induced at 10 min intervals in nine pigs with integrated ICD systems. After 10 s of each episode of VF, a 40 J biphasic shock was delivered, which successfully terminated VF (a total of 10 shocks). The bipolar pacing threshold at the right ventricular apex was measured before each shock and at 1 min intervals after each shock. RESULTS: The mean pacing threshold was 0.029+/-0.059 muJ before the first shock and gradually increased to 0.14+/-0.10 muJ after the 10th shock. CONCLUSION: It may be necessary to pace at a high-voltage output following biphasic shocks delivered by integrated bipolar ICD systems.
Authors: Y Yamanouchi; J E Brewer; K F Olson; K A Mowrey; T N Mazgalev; B L Wilkoff; P J Tchou Journal: Circulation Date: 1999-08-24 Impact factor: 29.690
Authors: A Natale; J Sra; K Axtell; C Maglio; A Dhala; S Deshpande; M Jazayeri; A Wase; M Akhtar Journal: J Am Coll Cardiol Date: 1994-08 Impact factor: 24.094
Authors: G Altamura; L Bianconi; F Lo Bianco; S Toscano; F Ammirati; C Pandozi; A Castro; M Cardinale; M Mennuni; M Santini Journal: Pacing Clin Electrophysiol Date: 1995-01 Impact factor: 1.976