Discrimination between ventricular tachycardia and ventricular fibrillation in an active implantable medical device of the defibrillator, cardiovertor and/or antitachycardia pacemaker type
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United States of America Patent
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Issued Date -
May 13, 2004
app pub date -
Sep 3, 2003
filing date -
Sep 4, 2002
priority date (Note) -
Abandoned
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Abstract
Discrimination between ventricular tachycardia and ventricular fibrillation in an active implantable medical device of the defibrillator, cardiovertor and/or antitachycardia pacemaker type. This device compares the ventricular rate or frequency with a first threshold (TDI) of detection of ventricular tachycardia, a second threshold (FDI) of detection of ventricular fibrillations, and a third threshold (F/TDI) intermediate the first and second thresholds. When the frequency is included between the third threshold (F/TDI) and second threshold (FDI), an additional discrimination is operated to discriminate 'super-rapid' ventricular tachycardia and ventricular fibrillation, based on an analysis of the stability of the ventricular frequency RR intervals. A shock therapy is applied only if the determined ventricular frequency is recognized as unstable. If not unstable, an antitachycardia pacing stimulation sequence is applied. When the determined ventricular frequency is included between the first threshold (TDI) and third threshold (F/TDI), the device normally continues the analysis of the cardiac rhythm based on other criteria to discriminate ventricular tachycardia by known criteria.
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