MSRA-0049

MSRA-0049

A 61-year-old man presents to the emergency department with a 2-hour history of dizziness and palpitations. He denies any chest pain or shortness of breath. His medical history includes hypertension and stable angina.

Vital signs:
– Temperature: 36.7ºC
– Heart rate: 44 bpm
– Blood pressure: 90/51 mmHg
– Respiratory rate: 18 breaths/min
– Oxygen saturations: 94% on air

On examination, his pulse is regular bilaterally, and his calves are soft and nontender. Auscultation reveals vesicular breath sounds and normal heart sounds. An ECG shows sinus rhythm with a PR interval of 210ms (120-200ms).

What is the most appropriate next step in managing this patient?