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1. A 65-year-old male with a history of heart failure is prescribed furosemide. Critically, what electrolyte imbalance is he most urgently at risk of developing with chronic use, requiring diligent monitoring?
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3. A physician is considering prescribing an ACE inhibitor (e.g., lisinopril) for a patient with hypertension. Technically, which of the following is a critical adverse effect to monitor for, especially in the initial phase of therapy?