system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 55-year-old man presents with sudden onset palpitations for the past couple of hours. He denies any chest pain. Past medical history is significant for unknown kidney disease. Current medications are amiloride and daily aspirin. His blood pressure is 123/87 mm Hg and pulse is 45/min. Physical examination is unremarkable. An ECG shows tall peaked T waves with sinus bradycardia. Laboratory findings are significant for serum potassium of 6.1 mEq/L. Which of the following therapies may worsen this patient’s condition?
   
assistant
Administering a β-antagonist