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Moderateevidence-based beta-blockerHeart Failure with Reduced Ejection Fraction (HFrEF)"aha/acc/hfsa guideline (2022): heart failure"

A 68-year-old with HFrEF (EF 30%) on metoprolol succinate and furosemide is stable. Creatinine 1.0, potassium 4.6. What additional foundational therapy should be initiated next to reduce mortality?

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