[Auricular fibrillation: a cause of reversible myocardiopathy].

A chronic supraventricular tachycardia may alone be responsible for a picture of severe congestive cardiac insufficiency, which is totally reversible after return to a sinus rhythm. The two cases reported here emphasize this particular fact, the physiopathology of which still remains unknown. There is also a prognostic advantage to such cases: in the presence of a congestive cardiopathy with atrial fibrillation, apparently idiopathic, it is important to try to obtain a sinus rhythm and to study from a distance the left ventricular performance indexes which may return to normal after regularization of the rhythm.