Atrial flutter (AF) is defined a rapid regular atrial rate of 300-600 bpm accompanied by variable degrees of atrioventricular (AV) conduction block. This is rare in fetuses and neonates. Fetuses and neonates with atrial flutter or ectopic atrial tachycardia were more likely to be macrosomic or born to diabetic mothers than the general population. Postnatal echocardiography suggests that there may be abnormal diastolic left ventricular filling in some babies with these arrhythmias. Fetal AF is a serious and threatening rhythm disorder; particularly when it causes hydrops, it may be associated with fetal death or neurological damage. The risk of sudden death from 20 to 40 weeks of gestation is 6 to 12 deaths /1000 fetuses per year.
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