• Federico Angriman, Fiona Muttalib, François Lamontagne, AdhikariNeill K JNKJDepartment of Critical Care Medicine, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.Interdep, and LOVIT Investigators.
• Department of Critical Care Medicine, Sunnybrook Health Sciences Centre, Toronto, ON, Canada.
• Crit. Care Med. 2023 Aug 1; 51 (8): e152e156e152-e156.

ObjectivesThe Lessening Organ Dysfunction with Vitamin C trial showed a harmful effect of vitamin C on 28-day death or persistent organ dysfunction. To maximize interpretation, we present a post hoc Bayesian reanalysis.DesignBayesian reanalysis of a randomized placebo-controlled trial.SettingThirty-five ICUs.PatientsAdults with proven or suspected infection, vasopressor support, and no more than 24 hours of ICU admission.InterventionsPatients were allocated to receive either vitamin C (50 mg/kg of body weight) or placebo every 6 hours for up to 96 hours.Measurements And Main ResultsThe primary outcome was the composite of death or persistent organ dysfunction (i.e., vasopressor use, invasive mechanical ventilation, or new renal replacement therapy) at 28 days. We used Bayesian log-binomial models with random effects for hospital site and varying informative prior beliefs for the effect of vitamin C to estimate risk ratios (RRs) with 95% credible intervals (Crls) in the intention to treat population (vitamin C, 435 patients; placebo, 437 patients). Using weakly neutral priors, patients allocated to vitamin C had a higher risk of death or persistent organ dysfunction at 28 days (RR, 1.20; 95% Crl, 1.04-1.39; probability of harm, 99%). This effect was consistent when using optimistic (RR, 1.14; 95% Crl, 1.00-1.31; probability of harm, 98%) and empiric (RR, 1.09; 95% Crl, 0.97-1.22; probability of harm, 92%) priors. Patients allocated to vitamin C also had a higher risk of death at 28 days under weakly neutral (RR, 1.17; 95% Crl, 0.98-1.40; probability of harm, 96%), optimistic (RR, 1.10; 95% Crl, 0.94-1.30; probability of harm, 88%), and empiric (RR, 1.05; 95% Crl, 0.92-1.19; probability of harm, 76%) priors.ConclusionsThe use of vitamin C in adult patients with proven or suspected infection and vasopressor support is associated with high probability of harm.Copyright © 2023 by the Society of Critical Care Medicine and Wolters Kluwer Health, Inc. All Rights Reserved.

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