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ModerateCardiologyHFrEF Optimizationus-abimus-usmle-step-2

A 74-year-old woman with HFrEF (EF 25%) and sinus rhythm with a heart rate of 68 bpm is on an ACE inhibitor, beta-blocker, MRA, and SGLT2 inhibitor. She has persistent symptoms. What is the next disease-modifying addition?

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