| 摘要 |
A system and method for more reliably detecting and treating arrhythmias such as ventricular fibrillation and tachycardia are provided. The system reacts to the detection of VF/VT by first looking for one or more sensed R waves to confirm arrhythmia. If the arrhythmia is confirmed, an appropriate shock is delivered directly. However, if the arrhytmia is not confirmed following a timed out confirmation duration, a pace pulse is delivered, following which the system looks to see if the pace pulse has resulted in capture of the patient's ventricle. Capture is determined by examining sensed far field signals that correlate with the delivered pace pulse. In a preferred embodiment the far field signals are sensed between aventricular fibrillation coil and a second electrode, the second electrode suitably being either an SCV electrode or the surface of the implanted defibrillator unit. If capture is determined, delivery of a shock is aborted, and the patient may be further treated with pacing therapy. If capture is not found, this indicates that the arrhythmia remains, even though not sensed during the confirmation duration, and shock therapy is applied directly.
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