Perinatal outcome of fetal supraventricular tachycardia. Report of 5 cases and review of the literature. Fetal supraventricular tachycardia (fsVT) is a rare cardiac arrhythmia and is associated with a mortality of 12%. The last decade fsVT has been detected more frequently probably on account of routine fetal monitoring. The outcome of 108 previously reported cases has been reviewed and 5 cases are added. Congestive heart-failure due to fsVT was seen quite frequently. Delivery by caesarean section was performed in 33% of fsVT-cases. Treatment of the condition before and after birth is discussed; digitalis is the drug of choice. A guide-line for delivery is suggested. fsVT should be listed among the possible causes of hydrops foetalis. On request a complete list of references concerning fetal supraventricular tachycardia is available from the authors.