Background Physiological studies have shown that chronic hypoxemiamay occur in preterm infants who require supplemental oxygenfor extended periods and that this hypoxemia may contributeto poor growth and development. Anecdotal reports and uncontrolledobservational studies have suggested that a higher oxygen-saturationrange may be beneficial in terms of growth and development.
Methods We conducted a multicenter, double-blind, randomized,controlled trial involving 358 infants born at less than 30weeks of gestation who remained dependent on supplemental oxygenat 32 weeks of postmenstrual age. They were randomly assignedto a target functional oxygen-saturation range of either 91to 94 percent (standard-saturation group) or 95 to 98 percent(high-saturation group); this target was maintained for theduration of supplemental-oxygen therapy. The primary outcomeswere growth and neurodevelopmental measures at a corrected ageof 12 months.
Results There were no significant differences between the groupsin weight, length, or head circumference at a corrected ageof 12 months. The frequency of major developmental abnormalitiesalso did not differ significantly between the standard-saturationgroup and the high-saturation group (24 percent and 23 percent,respectively, P=0.85). There were six deaths due to pulmonarycauses in the high-saturation group and one such death in thestandard-saturation group (P=0.12). The high-saturation groupreceived oxygen for a longer period after randomization (median,40 days vs. 18 days; P<0.001) and had a significantly higherrate of dependence on supplemental oxygen at 36 weeks of postmenstrualage and a significantly higher frequency of home-based oxygentherapy.
Conclusions Targeting a higher oxygen-saturation range in extremelypreterm infants who were dependent on supplemental oxygen conferredno significant benefit with respect to growth and developmentand resulted in an increased burden on health services.
Source Information
From the Centre for Perinatal Health Services Research (L.M.A., D.J.H.-S.) and the School of Public Health (L.I., J.M.S.), University of Sydney, Sydney, Australia.
Address reprint requests to Dr. Askie at the Centre for Perinatal Health Services Research, Queen Elizabeth II Research Institute, Bldg. DO2, University of Sydney, Sydney NSW 2006, Australia, or at lisa.askie{at}perinatal.usyd.edu.au.
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