[Familial long QT-syncope syndrome. 2 cases of Romano-Ward syndrome].

Two families with the Romano-Ward syndrome were studied; in family A there were 19 members from three generations, 11 of whom had the abnormality of a long QT interval, 2 of whom had fainting attacks, and 2 of whom died suddenly. In family B, comprising 5 members of two generations, 3 had the anomaly, one of these having fainting attacks, and also having an atrio-ventricular block. The bicycle ergometer test has an important part to play in decisions about treatment of the asymptomatic forms of the condition.