Monitoring LV SV During Simulated VT from Bi-V Pacing Leads

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Introduction: ICDs monitor intracardiac EGMs and respond to detected arrhythmias through either observation, anti-tachycardia pacing (ATP), or through the delivery of a shock. However, inappropriate shocks are delivered to one third of patients within the first 1-3 years. Coupling EGMs with an assessment of LV Stroke Volume (SV) would be of value to discriminate between hemodynamically stable and unstable arrhythmias. We propose the use of admittance Y, the inverse of complex impedance Z, measured using biventricular (Bi-V) pacing leads as a new method to monitor LV SV.