Robust rate calculation in an implantable cardiac stimulus or monitoring device

摘要

Devices and methods for analyzing cardiac signal data. An illustrative method includes identifying a plurality of detected events and measuring intervals between the detected events for use in rate estimation. In the illustrative embodiment, a set of intervals is used to make the rate estimation by first discarding selected intervals from the set. The remaining intervals are then used to calculate an estimated interval, for example by averaging the remaining intervals.

主权项

1. An implantable cardiac system for monitoring or treating a patient's heart, the implantable cardiac system including at least a plurality of implantable electrodes and operational circuitry coupled to the electrodes for performing cardiac signal analysis, in which the operational circuitry is configured to perform a cardiac signal analysis comprising:
sensing a signal using the implantable electrodes; detecting events in the sensed signal, the detected events separated by intervals; in a first method of estimating heart rate, averaging a set of intervals between detected events after analyzing the detected events and intervals to identify at least one of noise or overdetection, and calculating a first heart rate therefrom; in a second method of estimating heart rate, averaging a set of intervals between detected events after eliminating at least one interval using a set of interval selection rules, and calculating a second heart rate therefrom; and comparing the first heart rate to the second heart rate in order to analyze the patient's heart rhythm.