Whether patients with atrial septal defects can become pregnant depends on the following factors: 1. Whether the patient normally has symptoms. 2. Whether the echocardiography indicates heart enlargement or pulmonary hypertension. 3. The size of the atrial septal defect. 4. Whether there is a combination of arrhythmias such as atrial flutter or atrial fibrillation, and complications such as pulmonary hypertension or heart failure. For those without symptoms, and where the defect does not cause pulmonary hypertension or right heart enlargement, choosing to become pregnant is possible. Complications are not common in pregnant women with isolated atrial septal defects without pulmonary hypertension. Studies have shown that the incidence of complications in pregnant women, whether the defect is repaired or not, is relatively low. If the patient has related arrhythmias and complications, it should be closely monitored, because the cardiovascular system of the mother undergoes changes during pregnancy, leading to increased cardiac workload and a higher burden on the heart, which in turn can increase the incidence of arrhythmias. For women who are already at high risk of atrial flutter or fibrillation, this risk can increase further. Additionally, pregnant women are in an older physiological state, making it easier to form blood clots, and for those with atrial septal defects, the risk of paradoxical thrombosis increases.