Prenatal diagnosis and early intervention of intrauterine atrial flutter: Two case reports and literature review.

Perinatal onset of fetal atrial flutter (AFL) often presents with nonspecific symptoms, making it prone to missed diagnosis. Fetal AFL is a severe life-threatening arrhythmia, and early diagnosis and prompt treatment are crucial. Prenatal diagnosis of AFL primarily relies on fetal echocardiography; hence, enhancing the diagnostic accuracy of fetal echocardiography for AFL is crucial. Simultaneously, timely intervention and standardized treatment are equally important for maternal and fetal safety during the perinatal period.