3.循环系统 Aortic Ductus Arteriosus Fetal circulation to neonatal Ovale circulation RA ·脐血循环停止 Coronary Sinus RV ·肺血管阻力降低 IVER ·卵圆孔和动脉导管 功能性关闭 ·心率波动大 PLACENTA 3.循环系统 • 脐血循环停止 • 肺血管阻力降低 • 卵圆孔和动脉导管 功能性关闭 • 心率波动大 Fetal circulation to neonatal circulation