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Post-MI ICD Timing — EECC MCQ

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ModerateCoronary Artery DiseasePost-MI ICD TimingEECC

A 62-year-old man has an acute STEMI and undergoes successful primary PCI. His LVEF is 35% at discharge. He is started on quadruple GDMT. When should LVEF be reassessed to determine ICD eligibility?

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Correct answer: B — LVEF should be reassessed at least 6-12 weeks (ideally ≥3 months) after the acute MI on optimal GDMT — early post-MI LVEF may improve significantly with GDMT and myocardial recovery; ICD implantation should not occur within 40 days of acute MI (DINAMIT/IRIS trials showed no benefit of early ICD)

The timing of ICD assessment post-MI is critical: (1) ICD should NOT be implanted within 40 days of acute MI — the DINAMIT and IRIS trials showed no mortality benefit of early ICD post-MI (SCD reduction offset by increased non-sudden death); (2) LVEF should be reassessed at ≥6-12 weeks (ESC recommends ≥3 months of GDMT) to allow: myocardial stunning recovery, GDMT-mediated reverse remodelling, and stabilisation of the infarct zone; (3) if LVEF remains ≤35% at ≥3 months on optimal GDMT: primary prevention ICD indicated (Class I for ischaemic cardiomyopathy); (4) during the waiting period: wearable cardioverter-defibrillator (WCD) may be considered (Class IIb) for high-risk patients (LVEF <30%, NSVT). The 2022 ESC VA/SCD Guidelines provide this algorithm.

Reference: ESC (2022): VA/SCD Guidelines; DINAMIT/IRIS Trials