Arrhythmia discrimination based on determination of rate dependency

摘要

Cardiac systems and methods provide for discriminating between supraventricular tachyarrhythmia and ventricular tachyarrhythmia based on a determination that the patient's supraventricular rhythm exhibits rate dependency. One approach involves determining if a patient's supraventricular rhythm exhibits rate dependent morphology. If the patient's supraventricular rhythm is determined to exhibit rate dependent morphology, an implantable device classifies a detected tachyarrhythmia episode based on one or more templates selected from a plurality of rate-indexed templates stored in the device. Determining if the supraventricular rhythm exhibits rate dependent morphology may also include determining one or more rates at which the rate dependent morphology occurs.

主权项

1. A method of operating a medical device, comprising:
sensing supraventricular tachycardia (SVT) waveforms during one or more SVT episodes; measuring heart rates associated with the SVT waveforms; characterizing morphologies of the SVT waveforms; and determining whether the morphologies of the SVT waveforms are dependent or independent with respect to heart rate comprising determining one or more rates at which a change in morphology occurs, wherein at least one of characterizing and determining is implemented at least in part by circuitry.