A randomised crossover study of low-flow air or oxygen via nasal cannulae to prevent desaturation in preterm infants.

OBJECTIVE To compare the efficacy of low-flow oxygen, low-flow air and sham treatment given via nasal cannulae in preventing desaturation (falls in oxygen saturation (SpO2)) in preterm infants. STUDY DESIGN Infants born at <33 weeks gestation receiving gas at flow rates <1 l/min via nasal cannulae were eligible for inclusion. Enrolled infants received three treatments-0.1 l/min 100% oxygen, 0.1 l/min air, (21% oxygen) and sham (tubing disconnected from flow-meter)-via nasal cannulae, each for 3 h. Treatments were given in a randomly assigned order and caregivers were masked to treatment. Infants were monitored with a pulse oximeter that recorded SpO2 and heart rate every 2 s. Treatment was stopped before 3 h if infants reached prespecified failure criteria. We compared the rates of failure and the frequency and duration of desaturation episodes that occurred during each treatment. RESULTS Of 14 infants enrolled, 2 (14%) reached failure criteria during treatment with oxygen compared with 7 (50%) during treatment with air and sham. Among infants who completed the 3-h study periods, there were fewer episodes and shorter duration of desaturation with oxygen compared with air and sham. CONCLUSIONS At a flow rate of 0.1 l/min via nasal cannulae, air is no better than sham treatment in preventing desaturation in preterm infants, while 100% oxygen is superior to both.