A 28-year-old man presents to the emergency department with sudden onset palpitations, lightheadedness, and shortness of breath. ECG shows a regular narrow-complex tachycardia at a rate of 180 bpm with no discernible P waves. He is conscious and normotensive. What is the most appropriate initial management step for this patient?
✓ Correct Answer: Option B
Vagal maneuvers are the first-line treatment for hemodynamically stable patients with narrow-complex tachycardia, such as supraventricular tachycardia (SVT). Adenosine is used if vagal maneuvers fail.