How is bradycardia with poor perfusion managed in a child with a pulse?

• A. Immediate defibrillation
• B. Treat underlying causes; atropine 0.02 mg/kg IV/IO (minimum 0.1 mg; maximum 0.5 mg); consider pacing if ineffective
• C. Increase oxygen by 100% FiO2 and observe
• D. Administer epinephrine infusion only

Answer: (B)

When a child has bradycardia with poor perfusion but still has a pulse, the priority is to improve perfusion by addressing reversible causes and increasing the heart rate. The best next step is to treat the underlying issues and give atropine to boost heart rate and AV conduction. Atropine is given IV or IO at 0.02 mg/kg (minimum 0.1 mg, maximum 0.5 mg). It works by blocking parasympathetic influence on the heart, especially at the SA and AV nodes, which can raise the heart rate and improve perfusion. If there is not an adequate response, you should move to pacing, typically transcutaneous pacing, while continuing to treat reversible causes such as hypoxia, acidosis, electrolyte disturbances, and potential toxins.

Other options don’t fit because immediate defibrillation is used for pulseless or shockable rhythms, not a child with a pulse; simply increasing oxygen and observing doesn’t address the need to raise the heart rate; and giving an epinephrine infusion only is not the first-line approach and does not replace the need for atropine and pacing when indicated.