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Persistent fetal circulation : ウィキペディア英語版 | Persistent fetal circulation
Persistent fetal circulation is a condition caused by a failure in the systemic circulation and pulmonary circulation to convert from the antenatal circulation pattern to the "normal" pattern. In a fetus, there is high pulmonary vascular resistance and low pulmonary blood flow as the fetus does not use the lungs for oxygen transfer. Once the baby is born, the lungs are needed for oxygen transfer and need high blood flow which is encouraged by low pulmonary vascular resistance. It can be associated with pulmonary hypertension. Because of this, the condition is also known as "persistent pulmonary hypertension of the newborn". ==Epidemiology== It occurs in 1-2 infants per 1000 live births
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