24th May 2025

A 30-year-old woman attends the emergency department.

A 30-year-old woman attends the emergency department. She regrettably explains that she took a handful of amitriptyline tablets 3 hours ago. She has no medical history. You perform an ECG which shows a QRS of 140ms. Which of the following drugs would you first administer to correct this arrhythmia?

Select the SINGLE most appropriate option from the list below. Select ONE option only.