Care Flight Entrance Practice Exam

In symptomatic bradycardia, the immediate aim is to raise the heart rate quickly by reducing the parasympathetic (vagal) influence on the heart. Atropine does this by blocking muscarinic receptors on the SA and AV nodes, which increases automaticity and improves conduction, helping to restore a more effective rhythm and perfusion. The best initial step is to give an IV atropine dose of 0.5 mg, repeated every 3–5 minutes, with a maximum total dose of 3 mg. This fast-acting approach often reverses the bradycardia and improves symptoms rapidly. If atropine doesn’t produce a sufficient response or if the bradycardia is due to a rhythm that atropine won’t improve (for example, high-grade AV block or certain myocardial infarctions), escalation is needed. Options include transcutaneous pacing and, if needed, IV vasopressors such as dopamine or epinephrine, or moving toward transvenous pacing. The other stated options describe steps that are not the first-line management for a symptomatic bradycardia with a heart rate under 50.