Patent ID: 7274961

Claim:
An implantable cardiac stimulation device that treats accelerated ventricular arrhythmias of a patient's heart, the device comprising: a first sensing circuit that senses cardiac activity of the patient's right ventricle and provides a first signal; a second sensing circuit that senses cardiac activity of the patient's left ventricle and provides a second signal; a detector that detects an accelerated ventricular arrhythmia; a classifying circuit that measures relative correspondence between the first and second signals to classify a detected accelerated ventricular arrhythmia as either ventricular tachycardia or ventricular fibrillation, wherein the classifying circuit comprises a coherer that measures coherence between the first and second signals; and a therapy circuit that applies a first therapy to the heart responsive to a classified ventricular tachycardia and a second therapy to the heart responsive to a classified ventricular fibrillation.