A 52-year-old man with a 10-year history of hypertension presents to the emergency department with acute dyspnea, orthopnea, and peripheral edema. Clinical examination reveals elevated JVP, bilateral crackles, and a third heart sound. Echocardiography shows an ejection fraction of 28% with global hypokinesis. His current medications are enalapril 10 mg daily and amlodipine 5 mg daily. Blood pressure is 145/92 mmHg, heart rate 110 bpm, and respiratory rate 28/min. What is the most appropriate immediate next step in management?

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