A 52-year-old man with hypertension and stable angina is started on atenolol 50 mg daily. After 2 weeks, he presents with severe bradycardia (HR 42/min), hypotension (BP 88/56 mmHg), and dizziness. He denies chest pain or dyspnea. ECG shows normal sinus rhythm with prolonged PR interval. What is the most appropriate immediate next step in management?

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