[Fast atrial rhythms (author's transl)].

The authors present their experience on fast atrial rhythms. Fourteen patients were studied in the first three months of life, nine of them having congestive heart failure. The electrophysiological basis of the reentrance tachycardia at A-V junction is discussed. The pharmacological treatment is reviewed, emphasizing the usefulness of verapamil. They comment on the good prognosis of the disorder, provided there is not associated congenital heart disease.