Prevention of false asystole or bradycardia detection

摘要

In general, this disclosure is directed to signal processing based methods to reject undersensing in a signal indicative of cardiac activity, e.g., ECG. The undersensing may be due to very small signal amplitudes or due to a sudden increase in single peak amplitude resulting in an increased sensing threshold. The undersensing may result in falsely detecting a cardiac event, e.g., asystole or bradycardia. The techniques of this disclosure monitor the behavior of the signal to determine when a detected asystole is false.

主权项

1. A method comprising: sensing an electrocardiogram signal; comparing an amplitude of the signal to a first threshold; detecting at least one of an asystole or a bradycardia based on the comparison of the amplitude of the signal to the first threshold; in response to detecting at least one of the asystole or the bradycardia, comparing an amplitude of at least one R-wave detected in the signal to at least a second threshold, the at least one R-wave detected based on comparison of the amplitude of the signal to the first threshold; and determining whether the detection of the asystole or the bradycardia is false based on the comparison of the amplitude of the detected R-wave to the at least second threshold.