[Transient atrioventricular conduction 1:1 in a patient with common atrial flutter following the administration of adenosine triphosphate].

A patient with atrial flutter and 2:1 atrioventricular conduction and acceleration to 1:1 conduction after administration of a single i.v. dose of 10 mg adenosin triphosphate (ATP) is presented. Despite the fact that ATP is a very useful drug for the treatment of paroxysmal supraventricular tachycardia. Its use as a diagnostic tool in atrial flutter must be carefully considered and the possibility of transient acceleration of AV conduction must be taken into account.