[Clinical case of the month. Atrial flutter with rapid ventricular response (1:1 atrioventricular conduction) caused by flecaïnide]. / Le cas clinique du mois. Flutter auriculaire avec réponse ventriculaire rapide (conduction auriculo-ventriculaire 1:1) lors d'un traitement par flécaïnide.

We report a case of 1:1 flutter in a patient taking flecaïnide for atrial fibrillation. We discuss the mechanism of the arrhythmia, its treatment and the preventive attitude to be adopted.