| 摘要 |
An implanted ICD stimulation lead system (24) for implantation in a human heart having electrodes adapted to be energized selectively to achieve pacing in one instance, true bipolar sensing in another instance suitable for autocapture detection, and defibrillation in close proximity to the ventricular apex in still another instance. The stimulation system comprises an elongated insulated lead body (42) having a distal tip electrode (28), and two multipurpose electrodes (32, 34) which are selected for defibrillation or bipolar sensing purposes. True bipolar pacing is achieved between a primary shocking electrode (34) spaced approximately 1.7-3.0 cm from the tip electrode. A secondary shocking electrode (32) may be selectively used in parallel with the primary shocking electrode to achieve lower thresholds due to its closer proximity to the ventricular apex.
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