The ductus arteriosus quickly closes itself. is an important channel connecting the maternal fetal circulation before birth. After birth, this ductus arteriosus generally no longer has a physical function, so ductus arteriosus quickly closes itself. The persistent presence of ductus arteriosus leads to significant pressure changes in the systemic and pulmonary circulation, which have adverse effects on extremely/very premature infants. Therefore, persistent patent ductus arteriosus (PDA) is a systemic disease.
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the incidence of patent ductus arteriosus(PDA)
Timeframe: three months after birth
dynamic changes of ductus arteriosus in diameter, velocity and direction of blood flow
Timeframe: after admission, 12 hour, 24 hour, 48 hour, 72 hour, 96 hour, 120 hour, 144 hour, 168 hour, 192 hour, 216 hour, 240 hour and 2 weeks or any time of ductus arteriosus closed