What pharmacologic agent is the most appropriate for the initial management of a child presenting with AV nodal reentrant tachycardia?

Study for the SAEM Cardiovascular Test. Utilize flashcards and multiple choice questions with hints and explanations. Prepare confidently for your exam!

Adenosine is the most appropriate pharmacologic agent for the initial management of a child presenting with AV nodal reentrant tachycardia (AVRT). AVRT is characterized by the presence of a reentrant circuit that often involves the AV node, and adenosine works effectively to temporarily block conduction through the AV node. This action can interrupt the reentrant circuit, leading to a rapid termination of the tachycardia and restoration of normal sinus rhythm.

When administered, adenosine causes a brief period of asystole, which can reset the electrical conduction system and terminate the tachycardia. It has a very short half-life, making it ideal for acute situations where immediate intervention is needed.

Other options, while they have roles in the management of various arrhythmias, are not the first-line agents for AVRT. For instance, digoxin primarily works by enhancing vagal tone and may take longer to show effects, making it less suitable for acute management. Diltiazem, a calcium channel blocker, can be used in some cases of atrial fibrillation and other rapid heart rates but is not the immediate choice for AVRT. Lidocaine, an antiarrhythmic, is generally more suited for ventricular

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