In management of bradycardia due to primary AV block, what is the drug of choice in children?

In the management of bradycardia due to primary AV block in children, atropine is the drug of choice. Atropine is an anticholinergic medication that works by blocking the effects of the vagus nerve on the heart, which can lead to an increase in heart rate. This action is particularly useful in cases of bradycardia where increased vagal tone or AV nodal block is a factor.

Atropine is effective because it directly counters the parasympathetic stimulation that may be slowing the heart rate. In pediatric patients, the administration of atropine can be crucial for stabilizing heart rhythm, especially if the bradycardia is causing hemodynamic instability.

In contrast, the other options have different mechanisms and are not first-line treatments for bradycardia due to primary AV block. Adenosine, for example, is primarily used for the treatment of certain types of supraventricular tachycardia rather than bradycardia. Amiodarone, while useful for various arrhythmias, is typically not indicated for bradycardia related to AV block. Vasopressin serves different purposes in resuscitation scenarios, such as in cardiac arrest, but it does not specifically address