Adenosine may be used for a hemodynamically stable child with wide complex tachycardia if:

Adenosine is a medication often used in the treatment of supraventricular tachycardia and can be effective for certain types of wide complex tachycardia, particularly when the rhythm is regular and monomorphic. This means that the QRS complexes are uniform in appearance and occur at a consistent rate, which suggests a stable rhythm that can respond positively to adenosine.

When the ventricular rhythm is regular and monomorphic, it indicates that the tachycardia is likely originating from a single focus in the ventricles, which is a key factor in determining the appropriateness of using adenosine. Adenosine works by temporarily interrupting the conduction through the atrioventricular (AV) node, allowing for a reset of the heart's electrical system. Its effectiveness is best observed in these regular, monomorphic rhythms compared to irregular or polymorphic variants, where the risk of more serious underlying conditions may be greater.

In the case of a hemodynamically stable child with wide complex tachycardia, recognizing and confirming the regularity and uniformity of the QRS complexes becomes crucial in deciding to use adenosine. This reflects an understanding of the underlying arrhythmia and ensures that treatment is both safe and directed