us-abim MCQ (SBA): Heart Failure with LBBB (CRT)

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ModerateCardiologyHeart Failure with LBBB (CRT)us-abimus-usmle-step-2

A 63-year-old with LBBB, QRS 160 ms, sinus rhythm, and LVEF 30% remains symptomatic despite GDMT. What therapy improves symptoms and survival?

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