Adenosine response and failure to convert paroxysmal supraventricular tachycardia in the emergency department.

Background And Importance: Although adenosine is the recommended first-line therapy for patients with paroxysmal supraventricular tachycardia (SVT), it may fail to restore normal sinus rhythm. The factors associated with this failure remain unclear.

Objective: To assess the response rate to adenosine and identify the factors causing adenosine failure in the management of paroxysmal SVT.