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ModerateCardiologyHeart Failure-Device Therapyus-abimus-usmle-step-3

A 64-year-old with HFrEF (LVEF 25%) and persistent symptoms on ARNI, β‑blocker, MRA, and SGLT2 inhibitor asks about additional therapy. QRS is 160 ms with LBBB, sinus rhythm. Best next step?

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