Cov shunts kaw sai tom qab yug me nyuam thaum tus menyuam mos pib ua pa thiab lub ntsws perfused. Nyob rau lub sijhawm no, cov leeg nqaij thiab cov leeg endothelial ntawm lub ductus arteriosus degenerate thiab raug kev loj hlob, apoptosis, thiab fibrous kho obstruction (Daim duab 2).
Yuav ua li cas rau tus menyuam hauv plab tom qab yug me nyuam?
Kev kaw ntawm lub ductus arteriosus, ductus venosus, thiab foramen ovale ua tiav qhov kev hloov ntawm fetal ncig mus rau cov menyuam yug tshiab.
Thaum twg fetal shunts yuav tsum kaw nyob rau hauv ib tug neonate?
Permanent anatomic kaw ntawm lub ductus arteriosus tshwm sim hauv 3 lub lis piam mus rau 3 lub hlis tom qab yug me nyuam. Ua ntej yug me nyuam, cov hlab ntsha pulmonary muaj txheej tuab ntawm cov leeg nqaij, uas ua lub luag haujlwm tseem ceeb hauv pulmonary vasoconstriction.
3 fetal shunts yog dab tsi?
Lub fetal circulatory system bypasses lub ntsws thiab daim siab nrog peb shunts. Lub foramen ovale tso cai hloov cov ntshavntawm sab xis mus rau sab laug atrium, thiab lub ductus arteriosus tso cai hloov cov ntshav los ntawm cov hlab ntsha pulmonary mus rau aorta.
Qhov twg kaw thawj lub foramen ovale thiab ductus arteriosus?
Circulatory Changes at Birth
Tus cia li poob rau hauv txoj cai atrial siab pushes lub septum primum tiv thaiv lub septum secundum, kaw lub foramen ovale. Lub ductus arteriosus pib kaw yuav luag tam sim ntawd, thiab tej zaum yuav qhib los ntawmKev tswj hwm ntawm prostaglandins.
