Patent ID: 8280500

Claim:
A method comprising: detecting a tachycardia rhythm; identifying a rate of change in heart rate corresponding to the tachycardia rhythm; identifying a rate of change in heart rate variability corresponding to the tachycardia rhythm; and classifying the tachycardia rhythm as at least one of supraventricular tachycardia or ventricular tachycardia based on the rate of change in heart rate and rate of change in heart rate variability, wherein classifying the tachycardia rhythm comprises: classifying the tachycardia rhythm as ventricular tachycardia if the rate of change in heart rate variability exceeds both a first and second threshold; and classifying the tachycardia rhythm as supraventricular tachycardia if the rate of change in heart rate variability does not exceed both the first and second threshold.