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We have created a totally synthetic, protein-free surfactant (Exosurf) composed of dipalmitoylphosphatidylcholine, hexadecanol, and tyloxapol. We studied the effects of endotracheal instillation of Exosurf on survival and pulmonary function of preterm lambs delivered at 131 to 133 days gestation (term 148 days). Exosurf treatment was compared with instillation of surface-active material prepared from lung lavages of adult sheep and with no instillation. Lambs were delivered by cesarean section, paralyzed, and mechanically ventilated. The Exosurf group survived longer (80% alive at 11 hours) than did the no instillation group (30% alive at 11 hours) (P less than 0.05). There were no statistically significant differences between the Exosurf and sheep surfactant groups. We conclude that Exosurf, a synthetic surfactant, produces significant improvement in survival and pulmonary function in preterm lambs.
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