Patent ID: 8406871

Claim:
A method, of treating a ventricular arrhythmia, comprising: determining occurrence of a ventricular arrhythmia comprising at least one of a ventricular tachycardia or a ventricular fibrillation; determining a change in a sinus node cycle length of a heart of a patient between a time 60 seconds or less prior to onset of the ventricular arrhythmia and a time during the ventricular arrhythmia; when the change in the sinus node cycle length is within a first range corresponding to lengthening of the sinus node cycle length during the ventricular arrhythmia, delivering a first electrical therapy to the patient for treating the ventricular arrhythmia; and when the change in the sinus node cycle length is within a second range corresponding to shortening of the sinus node cycle length during the ventricular arrhythmia, delivering a second electrical therapy to the patient for treating the ventricular arrhythmia, wherein the first electrical therapy is different from the second electrical therapy.