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Meta-Analysis
. 2017 Jan 5;1(1):CD000399.
doi: 10.1002/14651858.CD000399.pub3.

Nitric oxide for respiratory failure in infants born at or near term

Keith J Barrington  1 , Neil Finer  2 , Thomas Pennaforte  3 , Gabriel Altit  4
Affiliations
Meta-Analysis

Nitric oxide for respiratory failure in infants born at or near term

Keith J Barrington et al. Cochrane Database Syst Rev. .

Abstract

Background: Nitric oxide (NO) is a major endogenous regulator of vascular tone. Inhaled nitric oxide (iNO) gas has been investigated as treatment for persistent pulmonary hypertension of the newborn.

Objectives: To determine whether treatment of hypoxaemic term and near-term newborn infants with iNO improves oxygenation and reduces rate of death and use of extracorporeal membrane oxygenation (ECMO), or affects long-term neurodevelopmental outcomes.

Search methods: We used the standard search strategy of the Cochrane Neonatal Review Group to search the Cochrane Central Register of Controlled Trials (CENTRAL; 2016, Issue 1), MEDLINE via PubMed (1966 to January 2016), Embase (1980 to January 2016) and the Cumulative Index to Nursing and Allied Health Literature (CINAHL; 1982 to January 2016). We searched clinical trials databases, conference proceedings and reference lists of retrieved articles for randomised controlled trials and quasi-randomised trials. We contacted the principal investigators of studies published as abstracts to ascertain the necessary information.

Selection criteria: Randomised studies of iNO in term and near-term infants with hypoxic respiratory failure, with clinically relevant outcomes, including death, use of ECMO and oxygenation.

Data collection and analysis: We analysed trial reports to assess methodological quality using the criteria of the Cochrane Neonatal Review Group. We tabulated mortality, oxygenation, short-term clinical outcomes (particularly use of ECMO) and long-term developmental outcomes.

Statistics: For categorical outcomes, we calculated typical estimates for risk ratios and risk differences. For continuous variables, we calculated typical estimates for weighted mean differences. We used 95% confidence intervals and assumed a fixed-effect model for meta-analysis.

Main results: We found 17 eligible randomised controlled studies that included term and near-term infants with hypoxia.Ten trials compared iNO versus control (placebo or standard care without iNO) in infants with moderate or severe severity of illness scores (Ninos 1996; Roberts 1996; Wessel 1996; Davidson 1997; Ninos 1997; Mercier 1998; Christou 2000; Clark 2000; INNOVO 2007; Liu 2008). Mercier 1998 compared iNO versus control but allowed back-up treatment with iNO for infants who continued to satisfy the same criteria for severity of illness after two hours. This trial enrolled both preterm and term infants but reported most results separately for the two groups. Ninos 1997 studied only infants with congenital diaphragmatic hernia.One trial compared iNO versus high-frequency ventilation (Kinsella 1997).Six trials enrolled infants with moderate severity of illness scores (oxygenation index (OI) or alveolar-arterial oxygen difference (A-aDO2)) and randomised them to immediate iNO treatment or iNO treatment only after deterioration to more severe criteria (Barefield 1996; Day 1996; Sadiq 1998; Cornfield 1999; Konduri 2004; Gonzalez 2010).Inhaled nitric oxide appears to have improved outcomes in hypoxaemic term and near-term infants by reducing the incidence of the combined endpoint of death or use of ECMO (high-quality evidence). This reduction was due to a reduction in use of ECMO (with number needed to treat for an additional beneficial outcome (NNTB) of 5.3); mortality was not affected. Oxygenation was improved in approximately 50% of infants receiving iNO. The OI was decreased by a (weighted) mean of 15.1 within 30 to 60 minutes after the start of therapy, and partial pressure of arterial oxygen (PaO2) was increased by a mean of 53 mmHg. Whether infants had clear echocardiographic evidence of persistent pulmonary hypertension of the newborn (PPHN) did not appear to affect response to iNO. Outcomes of infants with diaphragmatic hernia were not improved; outcomes were slightly, but not significantly, worse with iNO (moderate-quality evidence).Infants who received iNO at less severe criteria did not have better clinical outcomes than those who were enrolled but received treatment only if their condition deteriorated. Fewer of the babies who received iNO early satisfied late treatment criteria, showing that earlier iNO reduced progression of the disease but did not further decrease mortality nor the need for ECMO (moderate-quality evidence). Incidence of disability, incidence of deafness and infant development scores were all similar between tested survivors who received iNO and those who did not.

Authors' conclusions: Inhaled nitric oxide is effective at an initial concentration of 20 ppm for term and near-term infants with hypoxic respiratory failure who do not have a diaphragmatic hernia.

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Conflict of interest statement

Dr Barrington was chair of the iNO Therapeutics Canadian Medical Advisory Committee for a single meeting, for which he received expenses and an honorarium. Dr Finer previously served as a member of the iNO Therapeutics Advisory Committee.

Figures

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1
Study flow diagram: review update.
2
2
Risk of bias summary: review authors' judgements about each risk of bias item for each included study.
3
3
Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
See this image and copyright information in PMC

Update of

References

References to studies included in this review

Barefield 1996 {published data only}
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Christou 2000 {published data only}
    1. Christou H, Marter LJ, Wessel DL, Allred EN, Kane JW, Thompson JE, et al. Inhaled nitric oxide reduces the need for extracorporeal membrane oxygenation in infants with persistent pulmonary hypertension of the newborn. Critical Care Medicine 2000;28:3722‐7. - PubMed
Clark 2000 {published data only}
    1. Clark RH, Keuser TJ, Walker MW, Southgate MS, Huckaby JL, Perez JA, et al. for the Clinical Inhaled Nitric Oxide Research Group. Low‐dose nitric oxide therapy for persistent pulmonary hypertension of the newborn. New England Journal of Medicine 2000;342:469‐74. - PubMed
Cornfield 1999 {published data only}
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Davidson 1997 {published data only}
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Day 1996 {published data only}
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Gonzalez 2010 {published data only}
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INNOVO 2007 {published data only}
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Kinsella 1997 {published data only}
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    1. Kinsella JP, Truog WE, Walsh WF, Goldberg RN, Bancalari EE, Mayock DE, et al. Randomized, multicenter trial of inhaled nitric oxide and high‐frequency oscillatory ventilation in severe, persistent pulmonary hypertension of the newborn. Journal of Pediatrics 1997;131:55‐62. - PubMed
Konduri 2004 {published data only}
    1. Konduri GG, Solimano A, Sokol GM, Singer J, Ehrenkranz RA, Singhal N, et al. Neonatal Inhaled Nitric Oxide Study Group. A randomized trial of early versus standard inhaled nitric oxide therapy in term and near‐term newborn infants with hypoxic respiratory failure. Pediatrics 2004;113(3 Pt 1):559‐64. - PubMed
    1. Konduri GG, Vohr B, Robertson C, Sokol GM, Solimano A, Singer J, et al. Early inhaled nitric oxide therapy for term and near‐term newborn infants with hypoxic respiratory failure: neurodevelopmental follow‐up. Journal of Pediatrics 2007;150(3):235‐40.e1. - PMC - PubMed
Liu 2008 {published data only}
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Mercier 1998 {published data only}
    1. Franco‐Belgium Collaborative NO Trial Group. Early compared with delayed inhaled nitric oxide in moderately hypoxaemic neonates with respiratory failure: a randomised controlled trial. Lancet 1999;354:1066‐71. - PubMed
    1. Mercier JC, Dehan M, Breart G, Clement S, O'Nody P. Inhaled nitric oxide in neonatal respiratory failure. Pediatric Research 1998;43:290A.
Ninos 1996 {published and unpublished data}
    1. The Neonatal Inhaled Nitric Oxide Study Group. Inhaled nitric oxide in full‐term and nearly full term infants with hypoxic respiratory failure. New England Journal of Medicine 1997;336:597‐604. - PubMed
    1. The Neonatal Inhaled Nitric Oxide Study Group. Inhaled nitric oxide in term and near‐term infants: neurodevelopmental follow‐up of the The Neonatal Inhaled Nitric Oxide Study Group (NINOS). Journal of Pediatrics 2000;136:611‐7. - PubMed
Ninos 1997 {unpublished data only}
    1. The Neonatal Inhaled Nitric Oxide Study Group. Inhaled nitric oxide and hypoxic respiratory failure in infants with congenital diaphragmatic hernia. Pediatrics 1997;99:838‐45. - PubMed
    1. The Neonatal Inhaled Nitric Oxide Study Group. Inhaled nitric oxide in term and near‐term infants: neurodevelopmental follow‐up of the The Neonatal Inhaled Nitric Oxide Study Group (NINOS). Journal of Pediatrics 2000;136:611‐7. - PubMed
Roberts 1996 {published data only}
    1. Roberts JD Jr, Fineman J, Morin FC III, Shaul PW, Rimar S, Schreiber MD, et al. Inhaled nitric oxide and persistent pulmonary hypertension of the newborn. New England Journal of Medicine 1997;336:605‐10. - PubMed
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Sadiq 1998 {published and unpublished data}
    1. Sadiq FH, Illinois Multicenter Trial. Treatment of persistent pulmonary hypertension of the newborn with nitric oxide: a randomized trial. Pediatric Research 1998;43:192A.
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Wessel 1996 {published data only}
    1. Ellington M, O'Reilly D, Allred EN, McCormick MC, Wessel DL, Kourembanas S. Child health status, neurodevelopmental outcome, and parental satisfaction in a randomized controlled trial of nitric oxide for persistent pulmonary hypertension of the newborn. Pediatrics 2001;107:1351‐6. - PubMed
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References to studies excluded from this review

Hoffman 1997 {published data only}
    1. Hoffman GM, Ross GA, Day SE, Rice TB, Nelin LD. Inhaled nitric oxide reduces the utilization of extracorporeal membrane oxygenation in persistent pulmonary hypertension of the newborn. Critical Care Medicine 1997;25:352‐9. - PubMed
Pinheiro 1998 {published data only}
    1. Pinheiro JMB, Carey T. Inhaled NO vs. intravenous nitroprusside in neonatal pulmonary hypertension: randomized trial at a center without ECMO. Pediatric Research 1998;43:294A.

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References to other published versions of this review

Finer 1997
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