Liberal Oxygen Therapy and Its Surprising Link to Increased Mortality Rates

Study Links Liberal Oxygen Therapy to Increased Mortality

Overview of the Research

A recent study published in The Lancet indicates that liberal oxygen therapy may be associated with a higher risk of death in patients. Typically, adults arriving at hospitals in critical condition undergo assessments of their vital signs. When medical professionals identify low oxygen levels in a patient’s blood, they administer supplemental oxygen to ensure adequate oxygenation.

Understanding SpO2 Levels

The term SpO2 refers to the percentage of oxygen in the air supplied to a patient for ventilation. However, there are instances where patients do not undergo subsequent evaluations for their oxygen needs, leading to continued administration of supplemental oxygen. This practice raises questions about the efficacy of oxygen therapy in acutely ill adults. Additionally, many patients receive large volumes of oxygen over extended periods, which is classified as liberal therapy.

Research Methodology

Researchers conducted a systematic review and meta-analysis to assess the validity of supplemental oxygen delivery to acutely ill patients. The study involved contributions from reputable medical institutions, including McMaster University in Hamilton, Canada; the Medical Research Institute of New Zealand in Wellington; and the Department of Intensive Care and Perioperative Medicine at Jagiellonian University Medical College in Krakow, Poland. The diverse geographical representation enhances the study’s accuracy and relevance to various populations.

Data Sources and Criteria

The meta-analysis compiled data from various studies published in recognized journal article databases such as the Cochrane Central Register of Controlled Trials, MEDLINE, Embase, HealthSTAR, LILACS, PapersFirst, and the WHO International Clinical Trials Registry. The researchers primarily focused on studies employing randomized controlled trials to distinguish between liberal and conservative oxygen therapy. Importantly, the specific illnesses affecting patients were not a criterion for inclusion; studies that excluded patients based on their medical conditions were omitted from the analysis. The team also tracked individual patient survival curves, with mortality and morbidity as the primary outcomes.

Key Findings and Conclusions

The results of the meta-analysis, published in The Lancet, revealed significant findings. Increased liberal oxygen therapy was linked to heightened mortality across all evaluated parameters. The researchers concluded that administering supplemental oxygen above an SpO2 level of 94-96% could be detrimental. They emphasized that conservative oxygen therapy is generally advantageous for most patients unless specific clinical circumstances dictate otherwise.

Authorship and Reference

The study was authored by Dr. Apollina Sharma, MBBS, GradDip EXMD. For further details, refer to the original publication: Chu, Derek K., et al. “Mortality and morbidity in acutely ill adults treated with liberal versus conservative oxygen therapy (IOTA): a systematic review and meta-analysis.” The Lancet 391.10131 (2018): 1693-1705.