Which of the following would be most helpful in treating sinus bradycardia during a pediatric resuscitation?

In the context of treating sinus bradycardia during pediatric resuscitation, the administration of epinephrine is the most beneficial approach. Sinus bradycardia in a pediatric patient can result from various factors, including inadequate cardiac output, hypoxia, or vagal stimulation. Epinephrine acts as a potent sympathomimetic agent that stimulates beta-adrenergic receptors, leading to an increase in heart rate and contractility. This response is crucial during resuscitation as it helps improve circulation and enhance perfusion to vital organs.

Epinephrine is routinely used in pediatric advanced life support (PALS) and is essential during cardiopulmonary resuscitation (CPR) efforts. Its ability to counteract bradycardia makes it a significant therapeutic option in this scenario.

Other treatments, while potentially useful in other clinical situations, do not directly address the issue of bradycardia in the same way that epinephrine does. For example, volume expansion therapy could be helpful in cases of hypovolemia but would not specifically target the heart rate. Sodium bicarbonate is used to correct metabolic acidosis and is not a treatment for bradycardia. Narcotic antagonists are primarily indicated for opioid overdose situations