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These preterm newborn lambs required high Fio2 (A) to maintain Po2 (B) at targeted level. Ratio of Po2 to Fio2 (C) was improved soon after surfactant treatment. Although not significant, the increase in Po2/Fio2 after treatment tends to be faster by CHF5633 than Survanta (p = 0.052 at 20 min).
