A trial of adenosine for the termination of supraventricular tachycardia in infancy: a case report.

A 40-day-old male infant was admitted due to cough, anorexia and pale face. Rapid heart beat was found accidentally by auscultation. Electrocardiograms revealed supraventricular tachycardia (SVT) with a heart rate up to 250 beats per minute, and an absence of P waves. Intravenous bolus injection of 1 mg adenosine terminated the tachycardia, followed by transient complete atrioventricular block, then latent Wolff-Parkinson-White (WPW) syndrome with retrograde P waves. Adenosine may be a new trial for the termination of SVT, and also is a safe drug even in the presence of WPW syndrome.