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13 October 2019 : Meta-Analysis  

Effect of Hyperbaric Oxygen on Neurologic Sequelae and All-Cause Mortality in Patients with Carbon Monoxide Poisoning: A Meta-Analysis of Randomized Controlled Trials

Weiqiang Wang12ABDE, Jincheng Cheng3BC, Jun Zhang1CF, Kai Wang145B*

DOI: 10.12659/MSM.917065

Med Sci Monit 2019; 25:7684-7693

Abstract

BACKGROUND: Hyperbaric oxygen (HBO) is used in patients with carbon monoxide (CO) poisoning to prevent the occurrence of delayed neurological sequelae. However, inconsistent results were obtained regarding the treatment effects of HBO. Therefore, the current meta-analysis was conducted based on published randomized controlled trials (RCTs) to determine the effect of HBO on neurologic sequelae and all-cause mortality in patients with CO poisoning.

MATERIAL AND METHODS: Electronic databases MedLine, EmBase, and the Cochrane Library were searched for relevant RCTs from inception to March 1, 2019. The pooled relative risks (RRs) and weighted mean differences (WMDs) with corresponding 95% confidence intervals (CIs) were calculated to evaluate the outcomes by using a random-effects model. Sensitivity, subgroup, and publication bias analyses were also conducted.

RESULTS: Seven RCTs, including 9 cohorts and a total of 2023 patients with CO poisoning, were enrolled in this study. The summary results revealed that HBO showed an association with lower risk of memory impairment compared to patients receiving normobaric oxygen (NBO), whereas 2 sessions of HBO showed an association with higher risk of memory impairment compared to those who received 1 session of HBO. Moreover, HBO was associated with increased neuropsychologic scores of block design and trail making when compared with NBO. No other significant differences regarding the treatment effects of HBO were observed.

CONCLUSIONS: These results indicate that HBO therapy significantly reduces the risk of memory impairment compared to NBO, but 2 sessions of HBO might not be better for memory impairment than 1 session of HBO.

Keywords: Carbon Monoxide Poisoning, Hyperbaric Oxygenation, meta-analysis, Safety, Behavior, Memory Disorders, Neuropsychological Tests, Publication Bias, Randomized Controlled Trials as Topic

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750