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- W3142215100 abstract "Delayed closure of the ductus arteriosus after birth has been observed in newborn infants with critical pulmonic stenosis and in newborn lambs with experimental pulmonic stenosis. This delayed ductal closure may be caused by a decreased ability of the muscle to contract when exposed to oxygen or to an increased production of or sensitivity to prostaglandin (PG) E2, the endogenous ductus arteriosus vasodilator. To determine whether the abnormal hemodynamic pattern during fetal life associated with pulmonic stenosis alters the responsiveness of the ductus arteriosus, we operated on 10 fetal lambs of gestational ages 70 to 77 days (term is 148 days) and placed a band around the pulmonary artery. Catheterization at 137 to 142 days showed severe pulmonic stenosis. We then studied isolated rings of ductus arteriosus from these lambs. The oxygen-induced increase in tension in rings of ductus arteriosus from lambs with pulmonic stenosis was significantly decreased (2.55 +/- 0.38; n = 10) compared with rings from ..." @default.
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- W3142215100 date "1984-01-01" @default.
- W3142215100 modified "2023-09-28" @default.
- W3142215100 title "Decreased contractility of the ductus arteriosus in experimental pulmonic stenosis." @default.
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