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ICD Programming to Reduce Inappropriate Shocks — EECC MCQ

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ModerateCardiac DevicesICD Programming to Reduce Inappropriate ShocksEECC

A 60-year-old man with HFrEF and a CRT-D presents with recurrent ICD shocks. Device interrogation reveals the shocks are for AF with rapid ventricular response being misclassified as VT. This has happened despite SVT discriminator algorithms. What device programming change can help?

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Correct answer: B — Increase the VT detection rate and lengthen the detection duration (number of intervals to detect) — the MADIT-RIT and ADVANCE III trials showed that higher detection rates (≥200 bpm) and longer detection intervals (30/40 beats) significantly reduce inappropriate shocks without increasing arrhythmic mortality

Inappropriate ICD shocks are a major quality of life issue. The MADIT-RIT (2012) and ADVANCE III (2013) trials demonstrated that programming higher detection rates (≥200 bpm for VT zone, ≥250 bpm for VF) and longer detection intervals (30 of 40 beats) significantly reduces inappropriate shocks (by up to 80%) and all-cause mortality compared with conventional programming. Additional strategies: (1) enabling SVT discriminators (morphology, onset criteria, stability); (2) programming ATP before shocks for the VT zone; (3) considering AV node ablation with CRT for refractory AF with rapid rate (the 'ablate and pace' strategy). The 2022 ESC VA/SCD Guidelines recommend these programming strategies as standard for all new ICD implants.

Reference: ESC (2022): VA/SCD Guidelines; MADIT-RIT/ADVANCE III Trials