Abstract
Fetal tachycardia occurs in 0.4 0.6% of all pregnancies. Out of the sustained fetal tachyarrhythmias, the atrial flutter is the second most common. It causes fetal heart failure when not properly treated, and early pregnancy interruption may be required. The diagnosis of tachyarrhythmias is mainly achieved by intra-uterus echocardiography. The first choice treatment is the maternal oral administration of digoxin. The association with other antiarrhythmics such as sotalol or amiodarone is needed if there is no response to digoxin or if the fetus evolves with dropsy. In this case report, the treatment began with digoxin and because there was no response, it was associated with propafenone. Sotalol or amiodarone were not used due to maternal bradycardia and hypotension.
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