A 72-year-old African-American male with New York Heart Association Class III coronary heart failure sees you for follow-up. He has shortness of breath with minimal exertion. The affected person is adherent to his treatment routine. His present medicines embody lisinopril (Prinivil, Zestril), 40 mg twice day by day; carvedilol (Coreg), 25 mg twice day by day; and furosemide (Lasix), 80 mg day by day. His blood stress is 100/60 mm Hg, and his pulse charge is 68 beats/min and common. Findings embody a number of scattered bibasilar rales on examination of the lungs, an S3 gallop on examination of the center, and no edema on examination of the legs. An EKG reveals a left bundle department block, and echocardiography reveals an ejection fraction of 25%, however no different abnormalities. Which one of many following can be most applicable at the moment?

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