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Pulmonary vascular resistance (PVR) changes in preterm lambs resuscitated with 100% oxygen (closed squares), 21% oxygen (open diamonds), and titrated inspired oxygen to maintain target SpO2 (closed circles). Term lambs ventilated with 21% inspired oxygen (controls - triangles) are shown by a hyphenated line. * 21% preterm oxygen statistically different from the rest by ANOVA (p<0.001).
