Method of determining sites for arrhythmia ablation

A - Human Necessities – 61 – B

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A61B 5/04 (2006.01) A61B 5/0402 (2006.01) A61B 18/14 (2006.01) A61N 1/05 (2006.01) A61N 1/40 (2006.01)

Patent

CA 2179058

A method of locating infarcted myocardial tissue in a beating heart includes the step of inserting an impedance measuring tip (10) of a catheter (14) into the chamber of the beating heart and measuring the impedance of the endocardium at various locations within the beating heart. The values measured are compared to impedance values with a predetermined range of values (22) to identify an infarcted area of myocardium and distinguish such area from normal myocardium (20). The measurements are also compared to a range of values for an infarction border zone. The infarction border zone is a significant source of arrhythmia and particularly of ventricular tachycardia. In accordance with the methods of the present invention, the risk of arrhythmia in a beating heart may be substantially reduced or eliminated by ablating endocardium within the infarction border zone utilizing the same catheter tip.

Une méthode de localisation de tissu myocardique infarci consiste à insérer une extrémité (10) d'un cathéter (14) servant à mesurer l'impédance dans une cavité d'un coeur en activité et à mesurer l'impédance de l'endocarde à différents emplacements dans ce coeur en activité. Les valeurs mesurées sont comparées à des valeurs d'impédance dans une gamme prédéterminée de valeurs (22), pour identifier une zone infarcie du myocarde et la distinguer du myocarde sain (20). Egalement, on compare les mesures à une gammme de valeurs valables pour une zone limite d'infarcissement. La zone limite d'infarcissement est une source importante d'arythmie et en particulier de tachycardie ventriculaire. Les méthodes de la présente invention permettent de diminuer, voire d'éliminer sensiblement le risque d'arythmie cardiaque, par une ablation de l'endocarde à l'intérieur de la zone limite d'infarcissement, en utilisant la même extrémité du cathéter.

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