Which condition is Adenosine indicated for?

Adenosine is indicated for the treatment of narrow-complex paroxysmal supraventricular tachycardia (PSVT). This condition is characterized by a rapid heart rate that originates from above the ventricles, typically involving the atria or the atrioventricular (AV) node. Adenosine acts by providing a transient block of conduction through the AV node, which can interrupt the re-entrant circuits that are often responsible for PSVT. This effect leads to a temporary slowing or cessation of the heart rhythm, allowing for restoration of normal sinus rhythm.

In contrast, the other conditions listed do not respond to adenosine in the same way. For instance, acute myocardial infarction requires different interventions focused on restoring blood flow to the heart tissue, heart failure is managed with medications aimed at improving cardiac output and reducing fluid overload, and atrial fibrillation typically necessitates a different approach for rhythm control or rate control, as adenosine is not effective in terminating this arrhythmia. Hence, adenosine's specific mechanism of action makes it the appropriate choice for narrow-complex PSVT.