Automatic threshold sensitivity adjustment for cardiac...

A - Human Necessities – 61 – N

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A61N 1/362 (2006.01) A61N 1/365 (2006.01) A61N 1/368 (2006.01)

Patent

CA 2299233

An implanting cardiac rhythm management device (10) includes a controller (28) adapted to receive digitized electrocardiogram signals from leads (14) placed on or in the heart, and incorporates an auto-sense algorithm which automatically adjusts the sensing threshold dependent upon an average or maximum amplitude of noise detected during a period following a sensed cardiac depolarization. The sensing threshold is automatically set on a beat to beat basis at a level such that the signal to noise ratio exceeds a preset value.

Un dispositif implantable de régulation du rythme cardiaque (10) est constitué d'un régisseur (28) conçu pour recevoir des signaux numériques d'électrocardiogramme provenant d'électrodes (14) placées sur le coeur ou dans celui-ci et dispose d'un algorithme d'auto-détection qui règle automatiquement le seuil de détection en fonction d'une amplitude moyenne ou maximum de bruit détecté pendant une période consécutive à une dépolarisation cardiaque détectée. Le seuil de détection est fixé automatiquement battement par battement, à un niveau auquel le rapport signal-bruit dépasse une valeur prédéterminée.

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