Room to Breathe: The Impact of Oxygen Rationing on Health Outcomes in SARS-CoV2

Oxygen: Friend or foe in the COVID-19 battle

Hypoxia and hypoxemia are two different entities. Correcting hypoxemia without hypoxia tends to have disastrous effects and delays lung healing. In this study, we share a case of an elderly man with moderate COVID-19 who never received any form of supplemental oxygen as compared to other patients with similar presentation.

Oxygen and Mortality in COVID-19 Pneumonia: A Comparative Analysis of Supplemental Oxygen Policies and Health Outcomes Across 26 Countries

Introduction: Hypoxia is the main cause of morbidity and mortality in COVID-19. During the COVID-19 pandemic, some countries have reduced access to supplemental oxygen, whereas other nations have maintained and even improved access to supplemental oxygen. We examined whether variation in the nationally determined oxygen guidelines had any association with national mortality rates in COVID-19.

Methods: Three independent investigators searched for, identified, and extracted the nationally recommended target oxygen levels for the commencement of oxygen in COVID-19 pneumonia from the 29 worst affected countries. Mortality estimates were calculated from three independent sources. We then applied both parametric (Pearson's R) and non-parametric (Kendall's Tau B) tests of bivariate association to determine the relationship between case fatality rate (CFR) and target SpO₂, and also between potential confounders and CFR.

Results: Of the 26 nations included, 15 had employed conservative oxygen strategies to manage COVID-19 pneumonia. Of them, Belgium, France, USA, Canada, China, Germany, Mexico, Spain, Sweden, and the UK guidelines advised commencing oxygen when oxygen saturations (SpO₂) fell to 91% or less. A statistically significant correlation was found between SpO₂ and CFR both parametrically (R = −0.53, P < 0.01) and non-parametrically (−0.474, P < 0.01).

Conclusion: Our study highlights the disparity in oxygen provision for COVID-19 patients between the nations analysed. In those nations that pursued a conservative oxygen strategy, there was an association with higher national mortality rates. We discuss the potential reasons for such an association.