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Citation:
Weerakkody Y, Knipe H, Bell D, et al. Fetal atrial flutter. Reference article, Radiopaedia.org (Accessed on 02 May 2024) https://doi.org/10.53347/rID-13879
Fetal atrial flutter is the second most common fetal tachyarrhythmia and can account for up to 30% of such cases 1,2.
As with other tachyarrhythmias, it is often detected in the 3rd trimester.
It has a typical atrial rate of 300-600 beats per minute (bpm) and often has a variable ventricular rate due to the frequent presence of an atrioventricular (AV) conduction block (often 2:1 atrioventricular conduction 2):
- mean atrial rate: 440-520 bpm 2,8
- mean ventricular rate: 200-250 bpm 2,8
Associations
- coexistence of another form of arrhythmia: present in 5-10% of cases
- structural cardiac anomalies
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