1.
Meta-analysis of Oxygenation Saturation Targeting Trials: Do Infant Subgroups Matter?
Askie, LM
Clinics in perinatology. 2019;(3):579-591
Abstract
Participant data from approximately 5000 infants have been meta-analyzed to guide oxygen saturation policy for extremely preterm infants. The Neonatal Oxygenation Prospective Meta-analysis showed that targeting a higher oxygen saturation range compared with a lower range resulted in decreased death and necrotizing enterocolitis and no difference in major disability but increased treated retinopathy of prematurity (ROP) and supplemental oxygen use at 36 weeks' postmenstrual age. The 91% to 95% range can be recommended for all extremely preterm infants from birth but should be accompanied by stringent surveillance for the prevention and early treatment of ROP.
2.
Effect of dietary nitrate supplementation on metabolic rate during rest and exercise in human: A systematic review and a meta-analysis.
Pawlak-Chaouch, M, Boissière, J, Gamelin, FX, Cuvelier, G, Berthoin, S, Aucouturier, J
Nitric oxide : biology and chemistry. 2016;:65-76
Abstract
BACKGROUND Recent randomized controlled trials have suggested that dietary nitrate (NO3(-)), found in beetroot and other vegetables, and inorganic NO3(-) salts decrease metabolic rate under resting and exercise conditions. OBJECTIVE Our aim was therefore to determine from a systematic review and meta-analysis whether dietary NO3(-) supplementation significantly reduces metabolic rate, expressed as oxygen uptake (VO2), under resting and exercise conditions in healthy humans and those with cardiorespiratory diseases. DESIGN A systematic article search was performed on electronic databases (PubMed, Scopus and Web of Science) from February to March 2015. The inclusion criteria included 1) randomized controlled trials; 2) studies reporting the effect of NO3(-) on VO2 under resting and/or exercise conditions; 3) comparison between dietary NO3(-) supplementation and placebo. Random-effects models were used to calculate the pooled effect size. RESULTS Twenty nine randomized placebo-controlled trials were included in the systematic review, and 26 of which were included in the meta-analysis. Dietary NO3(-) supplementation significantly decreases VO2 during submaximal intensity exercise [-0.26 (95% IC: -0.38, -0.15), p < 0.01], but not in the sub-analysis of subjects with chronic diseases [-0.09 (95% IC: -0.50, 0.32), p = 0.67]. When data were separately analyzed by submaximal intensity domains, NO3(-) supplementation reduces VO2 during moderate [-0.29 (95% IC: -0.48,-0.10), p < 0.01] and heavy [-0.33 (95% IC: -0.54,-0.12), p < 0.01] intensity exercise. When the studies with the largest effects were excluded from the meta-analysis, there is a trend for a VO2 decrease under resting condition in dietary NO3(-) supplementation [-0.28 (95% IC: -0.62, 0.05), p = 0.10]. CONCLUSION Dietary NO3(-) supplementation decreases VO2 during exercise performed in the moderate and heavy intensity domains in healthy subjects. The present meta-analysis did not show any significant effect of dietary NO3(-) supplementation on metabolic rate in subjects with chronic diseases, despite enhanced exercise tolerance.
3.
[What is the optimal oxygen saturation for extremely premature infants? A Meta analysis].
Li, JY, Lin, ZL, Wei, J, Yan, YY, Lin, J
Zhongguo dang dai er ke za zhi = Chinese journal of contemporary pediatrics. 2015;(2):128-33
Abstract
OBJECTIVE To explore an optimal oxygen saturation for extremely preterm infants based on a systemic review of the published studies. METHODS A Meta analysis of the published studies by the NeOProM Group which compared the outcomes of extremely preterm infants (gestational age <28 weeks) maintained in either a low (85%-89%) or high (91%-95%) oxygen saturation (SpO2) by using the STATA 12.0. The outcomes measured included the mortality and the incidences of retinopathy of prematurity (ROP), necrotizing enterocolitis of newborn (NEC), broncho-pulmonary dysplasia (BPD), intraventricular hemorrhage (IVH) and patent ductus arteriosus (PDA). RESULTS Three studies were included, in which 2 460 infants were assigned into the low SpO2 group and 2 459 infants in the high SpO2 group. The Meta analysis demonstrated that the risk of mortality before discharge or at the age of 18 months increased in the low SpO2 group compared with the high SpO2 group (RR: 1.19; 95%CI: 1.05-1.35); the risk of ROP decreased in the low SpO2 group (RR: 0.73; 95%CI: 0.53-1.00); the risk of NEC increased in the low SpO2 group (RR: 1.26; 95%CI: 1.06-1.49). There was no significance in the incidences of BPD, IVH and PDA between the two groups. CONCLUSIONS Maintaining SpO2 at 85%-89% may decrease the incidence of ROP, but increase the mortality rate and the incidence of NEC in extremely premature infants.
4.
Optimal oxygenation of extremely low birth weight infants: a meta-analysis and systematic review of the oxygen saturation target studies.
Saugstad, OD, Aune, D
Neonatology. 2014;(1):55-63
Abstract
BACKGROUND The optimal oxygen saturation for extremely low birth weight infants in the postnatal period beyond the delivery room is not known. OBJECTIVES To summarize and discuss the results of the randomized trials, constituting the NEOPROM (Neonatal Oxygenation Prospective Meta-analysis) collaborative study, examining the effect of low versus high functional oxygen saturation targets in the postnatal period in premature infants with gestational age <28 weeks. METHODS A meta-analysis of SUPPORT (Surfactant, Positive Pressure and Pulse Oximetry Randomized Trial), the three BOOST II (Benefits of Oxygen Saturation Targeting) studies and the COT (Canadian Oxygen Trial) was performed including a total of 4,911 infants randomized to either a low (85-89%) or high (91-95%) functional oxygen saturation (SpO2) within the first 24 h after birth. RESULTS Relative risks (RR; 95% CIs) comparing a low versus a high oxygen saturation target were 1.41 (1.14-1.74) for mortality at discharge or at follow-up, 0.74 (0.59-0.92) for severe retinopathy of prematurity, 0.95 (0.86-1.04) for physiologic bronchopulmonary dysplasia, 1.25 (1.05-1.49) for necrotizing enterocolitis, 1.02 (0.88-1.19) for brain injury, and 1.01 (0.95-1.08) for patent ductus arteriosus. RR >1.0 favors a high oxygen saturation. CONCLUSIONS RRs for mortality and necrotizing enterocolitis are significantly increased and severe retinopathy of prematurity significantly reduced in low compared to high oxygen saturation target infants. There are no differences regarding physiologic bronchopulmonary dysplasia, brain injury or patent ductus arteriosus between the groups. Based on these results, it is suggested that functional SpO2 should be targeted at 90-95% in infants with gestational age <28 weeks until 36 weeks' postmenstrual age. However, there are still several unanswered questions in this field.