Patent ID: 6308095
Filing Date: 2001-10-23
Classification: A61N

Abstract:
A method, comprising:sensing a first signal representative of electrical activity at a first cardiac region of a patient, the first signal including a QRS-cardiac complex representative of a cardiac cycle sensed in the first cardiac region;sensing a second signal representative of electrical activity at a second cardiac region of said patient, the second signal including the QRS-cardiac complex as sensed in the second cardiac region;selecting a first feature of the first signal, where the first feature includes a first portion of the QRS-cardiac complex which is repeatably identifiable in subsequent QRS-cardiac complexes;selecting a second feature of the second signal, where the second feature includes a second portion of the QRS-cardiac complex which is repeatably identifiable in subsequent QRS-cardiac complexes;determining a time difference between the first feature and the second feature;comparing the time difference to a template time difference, where the template time difference is determined from the time difference between the first feature and the second feature obtained from said patient for a plurality QRS-cardiac complexes during normal sinus rhythm; andif the time difference exceeds the template time difference value by a predetermined margin, characterizing the QRS-cardiac complex as a ventricular tachycardia complex.