What is the initial management step for symptomatic bradycardia?

• A. Vagal maneuvers.
• B. Immediate transcutaneous pacing.
• C. Epinephrine infusion.
• D. Atropine first-line; if ineffective, temporary pacing.

Answer: (D)

Symptomatic bradycardia demands restoring heart rate quickly to improve perfusion. The best first step is to give atropine, which works by blocking the parasympathetic (vagal) influence on the heart. By inhibiting muscarinic receptors in the SA and AV nodes, atropine increases automaticity and conduction, typically producing a rapid rise in heart rate. The standard approach is IV atropine, 0.5 mg, may be repeated every 3–5 minutes to a total of about 3 mg, with a quick reassessment of the patient’s rhythm and perfusion.

If the heart rate and perfusion do not improve after atropine, or if there is a high-grade AV block or ongoing hemodynamic instability, move to temporary pacing to provide reliable pacing support while preparing for definitive management. Epinephrine or dopamine infusions can serve as bridging medications if pacing isn’t immediately available or while a device is being set up. Vagal maneuvers, while helpful for certain tachyarrhythmias, are not beneficial for symptomatic bradycardia and can worsen the situation.