A 52-year-old man with chronic obstructive pulmonary disease (COPD) exacerbation is admitted and started on intravenous methylprednisolone 500 mg once daily. After 3 days of therapy, he develops severe hypokalemia (serum K⁺ = 2.8 mEq/L) and hypertension (BP 165/95 mmHg). His blood glucose is 240 mg/dL. What is the most appropriate next step in management?

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