Utility of using far-field R-wave signals in the detection of fatal ventricular arrhythmia.

Current guidelines recommend cardioverter-defibrillator (ICD) programming, including faster detection rates, longer detection durations, and strict discrimination for supraventricular tachycardia (SVT) to prevent unnecessary ICD treatment. This delayed-style ICD programming could lead to a rise in the possibility of VF undersensing. To avoid this risk, an innovative algorithm known as VF Therapy Assurance (VFTA; Abbott, Sylmar, CA) has been developed. VFTA uses far-field R-wave signals during VT or VF episodes to provide ICD therapy in cases of near-field R-wave signal undersensing.