Background Neonates with pulmonary hypertension have been treatedwith inhaled nitric oxide because of studies suggesting thatit is a selective pulmonary vasodilator. We conducted a randomized,multicenter, controlled trial to determine whether inhaled nitricoxide would reduce mortality or the initiation of extracorporealmembrane oxygenation in infants with hypoxic respiratory failure.
Methods Infants born after a gestation of >34 weeks who were14 days old or less, had no structural heart disease, and requiredassisted ventilation and whose oxygenation index was 25 or higheron two measurements were eligible for the study. The infantswere randomly assigned to receive nitric oxide at a concentrationof 20 ppm or 100 percent oxygen (as a control). Infants whosepartial pressure of arterial oxygen (PaO2) increased by 20 mmHg or less after 30 minutes were studied for a response to 80-ppmnitric oxide or control gas.
Results The 121 infants in the control group and the 114 inthe nitric oxide group had similar base-line clinical characteristics.Sixty-four percent of the control group and 46 percent of thenitric oxide group died within 120 days or were treated withextracorporeal membrane oxygenation (P = 0.006). Seventeen percentof the control group and 14 percent of the nitric oxide groupdied (P not significant), but significantly fewer in the nitricoxide group received extracorporeal membrane oxygenation (39percent vs. 54 percent, P = 0.014). The nitric oxide group hadsignificantly greater improvement in PaO2 (mean [±SD]increase, 58.2±85.2 mm Hg, vs. 9.7±51.7 mm Hgin the controls; P<0.001) and in the oxygenation index (adecrease of 14.1±21.1, vs. an increase of 0.8±21.1in the controls; P<0.001). The study gas was not discontinuedin any infant because of toxicity.
Conclusions Nitric oxide therapy reduced the use of extracorporealmembrane oxygenation, but had no apparent effect on mortality,in critically ill infants with hypoxic respiratory failure.
Source Information
Dr. Ehrenkranz, as co-principal investigator of the study, assumes responsibility for the overall content and integrity of the article.
Address reprint requests to Dr. Richard A. Ehrenkranz at the Department of Pediatrics, Yale University School of Medicine, P.O. Box 208064, 333 Cedar St., New Haven, CT 06520-8064.
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