| 摘要 |
An implantable defibrillator for treating cardiac dysrhythmias in a human patient in which the delivery of electrical defibrillation countershocks to a plurality of implanted electrodes is synchronized to predetermined aspect of an atrial portion of the cardiac signals sensed by the device. The defibrillator includes a sealed housing structure constructed of a biocompatible material containing a battery source of electrical energy and a capacitor system to store electrical energy provided by the battery source to generate high voltage electrical countershocks. A control system within the implantable defibrillator includes sensing circuitry that senses cardiac signals representative of a heart rate and detection circuitry that evaluates the cardiac signals to detect a ventricular fibrillation. The control system includes circuitry that operates to control the storing and discharge of electric energy in the capacity system through the plurality of implanted electrodes such that delivery of the electrical energy is synchronized to a predetermined aspect of an atrial portion of the cardiac signals that is a predetermined delay after the occurrence of a P-wave.
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