What are the reasons that lead to persistent fetal circulation?

Patient's question:

Six-month prenatal ultrasound examination of the fetus with persistent arterial trunk

Doctor's answer:

If there is no family history of genetic disorders, it is likely caused by external factors. The other fetus may also have other abnormalities. Some abnormalities may not be discovered until several years after the child is born. Therefore, if your condition permits, it is still better to induce abortion for both. Medically speaking, as long as it is not an ectopic pregnancy or the mother has no blood system disorders, induced abortion can be performed directly.