Outcomes of Two Trials of Oxygen-Saturation Targets in Preterm Infants

In two trials involving preterm infants, an oxygen-saturation target of 85 to 89% versus 91 to 95% resulted in nonsignificantly higher rates of death or disability at 2 years but in significantly increased risks of the combined outcome and of death alone in post hoc combined analyses. The determinat...

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Published inThe New England journal of medicine Vol. 374; no. 8; pp. 749 - 760
Main Authors Tarnow-Mordi, William, Stenson, Ben, Kirby, Adrienne, Juszczak, Edmund, Donoghoe, Mark, Deshpande, Sanjeev, Morley, Colin, King, Andrew, Doyle, Lex W, Fleck, Brian W, Davis, Peter G, Halliday, Henry L, Hague, Wendy, Cairns, Pamela, Darlow, Brian A, Fielder, Alistair R, Gebski, Val, Marlow, Neil, Simmer, Karen, Tin, Win, Ghadge, Alpana, Williams, Cathy, Keech, Anthony, Wardle, Stephen P, Kecskes, Zsuzsoka, Kluckow, Martin, Gole, Glen, Evans, Nicholas, Malcolm, Girvan, Luig, Melissa, Wright, Ian, Stack, Jacqueline, Tan, Kenneth, Pritchard, Margo, Gray, Peter H, Morris, Scott, Headley, Bevan, Dargaville, Peter, Simes, R John, Brocklehurst, Peter
Format Journal Article
LanguageEnglish
Published United States Massachusetts Medical Society 25.02.2016
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Online AccessGet full text
ISSN0028-4793
1533-4406
DOI10.1056/NEJMoa1514212

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Abstract In two trials involving preterm infants, an oxygen-saturation target of 85 to 89% versus 91 to 95% resulted in nonsignificantly higher rates of death or disability at 2 years but in significantly increased risks of the combined outcome and of death alone in post hoc combined analyses. The determination of the range of oxygen saturation that minimizes the competing risks of death, retinopathy of prematurity, and later disability in preterm infants is important. 1 , 2 The U.K. and Australian Benefits of Oxygen Saturation Targeting (BOOST)–II trials are two of five comparative effectiveness trials of the targeting of oxygen saturation in infants born before 28 weeks’ gestation. 3 – 8 These trials, known collectively as the Neonatal Oxygen Prospective Meta-analysis (NeOProM) Collaboration, were designed to compare the effects of a lower oxygen-saturation target range (85 to 89%) versus a higher target range (91 to 95%) on a primary outcome of death . . .
AbstractList In two trials involving preterm infants, an oxygen-saturation target of 85 to 89% versus 91 to 95% resulted in nonsignificantly higher rates of death or disability at 2 years but in significantly increased risks of the combined outcome and of death alone in post hoc combined analyses. The determination of the range of oxygen saturation that minimizes the competing risks of death, retinopathy of prematurity, and later disability in preterm infants is important. 1 , 2 The U.K. and Australian Benefits of Oxygen Saturation Targeting (BOOST)–II trials are two of five comparative effectiveness trials of the targeting of oxygen saturation in infants born before 28 weeks’ gestation. 3 – 8 These trials, known collectively as the Neonatal Oxygen Prospective Meta-analysis (NeOProM) Collaboration, were designed to compare the effects of a lower oxygen-saturation target range (85 to 89%) versus a higher target range (91 to 95%) on a primary outcome of death . . .
BackgroundThe safest ranges of oxygen saturation in preterm infants have been the subject of debate.MethodsIn two trials, conducted in Australia and the United Kingdom, infants born before 28 weeks’ gestation were randomly assigned to either a lower (85 to 89%) or a higher (91 to 95%) oxygen-saturation range. During enrollment, the oximeters were revised to correct a calibration-algorithm artifact. The primary outcome was death or disability at a corrected gestational age of 2 years; this outcome was evaluated among infants whose oxygen saturation was measured with any study oximeter in the Australian trial and those whose oxygen saturation was measured with a revised oximeter in the U.K. trial.ResultsAfter 1135 infants in Australia and 973 infants in the United Kingdom had been enrolled in the trial, an interim analysis showed increased mortality at a corrected gestational age of 36 weeks, and enrollment was stopped. Death or disability in the Australian trial (with all oximeters included) occurred in 247 of 549 infants (45.0%) in the lower-target group versus 217 of 545 infants (39.8%) in the higher-target group (adjusted relative risk, 1.12; 95% confidence interval [CI], 0.98 to 1.27; P=0.10); death or disability in the U.K. trial (with only revised oximeters included) occurred in 185 of 366 infants (50.5%) in the lower-target group versus 164 of 357 infants (45.9%) in the higher-target group (adjusted relative risk, 1.10; 95% CI, 0.97 to 1.24; P=0.15). In post hoc combined, unadjusted analyses that included all oximeters, death or disability occurred in 492 of 1022 infants (48.1%) in the lower-target group versus 437 of 1013 infants (43.1%) in the higher-target group (relative risk, 1.11; 95% CI, 1.01 to 1.23; P=0.02), and death occurred in 222 of 1045 infants (21.2%) in the lower-target group versus 185 of 1045 infants (17.7%) in the higher-target group (relative risk, 1.20; 95% CI, 1.01 to 1.43; P=0.04). In the group in which revised oximeters were used, death or disability occurred in 287 of 580 infants (49.5%) in the lower-target group versus 248 of 563 infants (44.0%) in the higher-target group (relative risk, 1.12; 95% CI, 0.99 to 1.27; P=0.07), and death occurred in 144 of 587 infants (24.5%) versus 99 of 586 infants (16.9%) (relative risk, 1.45; 95% CI, 1.16 to 1.82; P=0.001).ConclusionsUse of an oxygen-saturation target range of 85 to 89% versus 91 to 95% resulted in nonsignificantly higher rates of death or disability at 2 years in each trial but in significantly increased risks of this combined outcome and of death alone in post hoc combined analyses. (Funded by the Australian National Health and Medical Research Council and others; BOOST-II Current Controlled Trials number, ISRCTN00842661, and Australian New Zealand Clinical Trials Registry number, ACTRN12605000055606.)
The safest ranges of oxygen saturation in preterm infants have been the subject of debate. In two trials, conducted in Australia and the United Kingdom, infants born before 28 weeks' gestation were randomly assigned to either a lower (85 to 89%) or a higher (91 to 95%) oxygen-saturation range. During enrollment, the oximeters were revised to correct a calibration-algorithm artifact. The primary outcome was death or disability at a corrected gestational age of 2 years; this outcome was evaluated among infants whose oxygen saturation was measured with any study oximeter in the Australian trial and those whose oxygen saturation was measured with a revised oximeter in the U.K. trial. After 1135 infants in Australia and 973 infants in the United Kingdom had been enrolled in the trial, an interim analysis showed increased mortality at a corrected gestational age of 36 weeks, and enrollment was stopped. Death or disability in the Australian trial (with all oximeters included) occurred in 247 of 549 infants (45.0%) in the lower-target group versus 217 of 545 infants (39.8%) in the higher-target group (adjusted relative risk, 1.12; 95% confidence interval [CI], 0.98 to 1.27; P=0.10); death or disability in the U.K. trial (with only revised oximeters included) occurred in 185 of 366 infants (50.5%) in the lower-target group versus 164 of 357 infants (45.9%) in the higher-target group (adjusted relative risk, 1.10; 95% CI, 0.97 to 1.24; P=0.15). In post hoc combined, unadjusted analyses that included all oximeters, death or disability occurred in 492 of 1022 infants (48.1%) in the lower-target group versus 437 of 1013 infants (43.1%) in the higher-target group (relative risk, 1.11; 95% CI, 1.01 to 1.23; P=0.02), and death occurred in 222 of 1045 infants (21.2%) in the lower-target group versus 185 of 1045 infants (17.7%) in the higher-target group (relative risk, 1.20; 95% CI, 1.01 to 1.43; P=0.04). In the group in which revised oximeters were used, death or disability occurred in 287 of 580 infants (49.5%) in the lower-target group versus 248 of 563 infants (44.0%) in the higher-target group (relative risk, 1.12; 95% CI, 0.99 to 1.27; P=0.07), and death occurred in 144 of 587 infants (24.5%) versus 99 of 586 infants (16.9%) (relative risk, 1.45; 95% CI, 1.16 to 1.82; P=0.001). Use of an oxygen-saturation target range of 85 to 89% versus 91 to 95% resulted in nonsignificantly higher rates of death or disability at 2 years in each trial but in significantly increased risks of this combined outcome and of death alone in post hoc combined analyses. (Funded by the Australian National Health and Medical Research Council and others; BOOST-II Current Controlled Trials number, ISRCTN00842661, and Australian New Zealand Clinical Trials Registry number, ACTRN12605000055606.).
Author Donoghoe, Mark
Deshpande, Sanjeev
Cairns, Pamela
Luig, Melissa
Fleck, Brian W
Stenson, Ben
Marlow, Neil
Hague, Wendy
Tarnow-Mordi, William
Evans, Nicholas
Juszczak, Edmund
Dargaville, Peter
Fielder, Alistair R
Stack, Jacqueline
Williams, Cathy
Ghadge, Alpana
Davis, Peter G
Darlow, Brian A
Kirby, Adrienne
Morley, Colin
Gebski, Val
Malcolm, Girvan
Pritchard, Margo
Kecskes, Zsuzsoka
Brocklehurst, Peter
Doyle, Lex W
Kluckow, Martin
Gray, Peter H
King, Andrew
Wardle, Stephen P
Headley, Bevan
Simes, R John
Tin, Win
Halliday, Henry L
Simmer, Karen
Wright, Ian
Keech, Anthony
Gole, Glen
Tan, Kenneth
Morris, Scott
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ContentType Journal Article
Copyright Copyright © 2016 Massachusetts Medical Society. All rights reserved.
Copyright_xml – notice: Copyright © 2016 Massachusetts Medical Society. All rights reserved.
CorporateAuthor The BOOST-II Australia and United Kingdom Collaborative Groups
BOOST-II Australia and United Kingdom Collaborative Groups
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Snippet In two trials involving preterm infants, an oxygen-saturation target of 85 to 89% versus 91 to 95% resulted in nonsignificantly higher rates of death or...
The safest ranges of oxygen saturation in preterm infants have been the subject of debate. In two trials, conducted in Australia and the United Kingdom,...
BackgroundThe safest ranges of oxygen saturation in preterm infants have been the subject of debate.MethodsIn two trials, conducted in Australia and the United...
BACKGROUNDThe safest ranges of oxygen saturation in preterm infants have been the subject of debate.METHODSIn two trials, conducted in Australia and the United...
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SubjectTerms Australia
Child, Preschool
Clinical trials
Death
Developmental Disabilities - epidemiology
Female
Gestational age
Humans
Infant
Infant Mortality
Infant, Extremely Premature - blood
Infant, Newborn
Infants
Male
Medical research
Newborn babies
Oximetry
Oxygen
Oxygen - blood
Oxygen Inhalation Therapy - adverse effects
Oxygen Inhalation Therapy - methods
Oxygen saturation
Premature babies
Premature birth
Risk
United Kingdom
Title Outcomes of Two Trials of Oxygen-Saturation Targets in Preterm Infants
URI https://nejm.org/doi/full/10.1056/NEJMoa1514212
https://www.ncbi.nlm.nih.gov/pubmed/26863265
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https://www.proquest.com/docview/1770866888
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