To compare the efficacy of RV and BiV ATP for the termination of ventricular arrhythmias in patients who are candidates to a cardiac resynchronisation therapy (CRT) and have a Class I or IIA indication for ICD implantation.
The hypothesis of delivering ATP from different sites (RV or BIV) has never been evaluated in a prospective, controlled and randomized study.
Primary Outcome Measures:
- Compare efficacy of ATP therapy (Burst, 8 pulses, 88 %, 1 sequence) to terminate all types of ventricular tachycardia when delivered in the right ventricle only versus both ventricles resulting in a 10 % difference in favour of BIV ATP. [ Time Frame: one year ]
Secondary Outcome Measures:
- Compare efficacy of:the first BiV and RV ATP to terminate FVT [ Time Frame: one year ]
- Compare efficacy of the first BiV and RV ATP to terminate slow VT [ Time Frame: one year ]
- Compare efficacy of BiV and RV ATP (all ATP therapies) to terminate slow VT [ Time Frame: one year ]
- Determine the rate of both FVT and VT episodes which are accelerated or degenerates into VF [ Time Frame: one year ]
Enrollment: |
535 |
Study Start Date: |
February 2004 |
Study Completion Date: |
April 2007 |
BiV: Experimental
ATP therapies are delivered in both the ventricles
|
Device: Defibrillator
Implantable defibrillator
|
RV: Active Comparator
ATP delivered only in the right ventricle
|
Device: Defibrillator
Implantable defibrillator
|
Main objective: Compare efficacy of ATP therapy (Burst, 8 pulses, 88 %, 1 sequence) to terminate all types of ventricular tachycardia (all VTs (FVT+VT)) when delivered in the right ventricle (RV) only versus both ventricles (BiV) resulting in a 10 % difference in favour of BIV ATP
Secondary objectives:
- Compare efficacy of the first BiV and RV ATP (Burst, 8 pulses, 88 %) to terminate fast ventricular tachycardia (FVT)
- Compare efficacy of the first BiV and RV ATP (Burst, 8 pulses, 88 %) to terminate slow ventricular tachycardia (slow VT)
- Compare efficacy of BiV and RV ATP (all ATP therapies) to terminate slow ventricular tachycardia (slow VT)
- Determine the rate of both FVT and VT episodes which are accelerated or degenerates into VF