Fetal cardiac arrhythmia: antepartum diagnosis of a case of congenital atrial flutter.

Abstract
A [human] case of antepartum atrial tachyarrhythmia was detected in the 36th wk of pregnancy. Cardiotocograph recordings done twice daily enabled close surveillance of the fetal condition after oxytoxin challenge testing failed to show evidence of hypoxia. After a diagnosis of fetal cardiac arrhythmia was made, elective cesarean section in the 40th wk of pregnancy resulted in delivery of an infant in atrial flutter and cardiac failure. Both problems were soon resolved by cardioversion and subsequent treatment with digoxin. Cardiac catheterization showed no underlying cardiac abnormality. Increasing use of antenatal cardiotocography may show that intrauterine tachyarrhythmias are more common than generally believed.

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