Automatic egm amplitude measurements during tachyarrhythmia...

A - Human Necessities – 61 – N

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A61N 1/362 (2006.01) A61B 5/0456 (2006.01) A61N 1/37 (2006.01)

Patent

CA 2529289

In an IMD (10), when tachyarrhythmia detection criterion are satisfied or a high intrinsic heart rate is detected, a peak amplitude detection circuit (186) is enabled to detect the peak amplitude of the cardiac signal of interest, i.e., the P-wave in the case of atrial tachyarrhythmias and the R- wave in case of ventricular tachyarrhythmias. Peak amplitude data is accumulated for subsequent use in setting sensing thresholds and/or gain of a sense amplifier (128) to reduce undersensing of lower amplitude cardiac signals during such tachyarrhythmias.

Selon l'invention, dans un dispositif médical implantable (10), lorsque les critères de détection de la tachyarythmie sont satisfaits ou qu'un débit cardiaque intrinsèque est détecté, un circuit (186) de détection d'amplitude de pic est capable de détecter l'amplitude de pic du signal cardiaque d'intérêt, c'est-à-dire l'onde P dans le cas d'une tachyarythmie auriculaire et l'onde R dans le cas d'une tachyarythmie ventriculaire. Les données d'amplitude de pic sont accumulées pour une utilisation ultérieure de mise en place des seuils de détection et/ou du gain d'un amplificateur de détection (128), ce qui permet de réduire la sous-détection d'une amplitude cardiaque plus faible, lors de ladite tachyarythmie.

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