• Florian Reizine, Agathe Delbove, Alexandre Dos Santos, Laetitia Bodenes, Pierre Bouju, Pierre Fillâtre, Aurélien Frérou, Guillaume Halley, Olivier Lesieur, Maud Jonas, Florian Berteau, Jean Morin, David Luque-Paz, Rémy Marnai, Anthony Le Meur, Cécile Aubron, Jean Reignier, Jean-Marc Tadié, and Arnaud Gacouin.
• CHU Rennes, Maladies Infectieuses Et Réanimation Médicale, 35033, Rennes, France. florian.reizine@chu-rennes.fr.
• Crit Care. 2021 Oct 24; 25 (1): 372.

BackgroundDrowning is a global threat and one of the leading causes of injury around the world. The impact of drowning conditions including water salinity on patients' prognosis remains poorly explored in Intensive Care Units (ICUs) patients.MethodsWe conducted a retrospective multicenter study on patients admitted to 14 ICUs in the west of France from January 2013 to January 2020. We first compared demographic and clinical characteristics at admission as well as clinical courses of these patients according to the salinity of drowning water. Then, we aimed to identify variables associated with 28-day survival using a Cox proportional hazard model.ResultsOf the 270 consecutive included patients, drowning occurred in seawater in 199 patients (73.7%) and in freshwater in 71 patients (26.3%). Day-28 mortality was observed in 55 patients (20.4%). Freshwater was independently associated with 28-day mortality (Adjusted Hazard Ratio (aHR) 1.84 [95% Confidence Interval (CI) 1.03-3.29], p = 0.04). A higher proportion of freshwater patients presented psychiatric comorbidities (47.9 vs. 19.1%; p < 0.0001) and the etiology of drowning appeared more frequently to be a suicide attempt in this population (25.7 vs. 4.2%; p < 0.0001). The other factors independently associated with 28-day mortality were the occurrence of a drowning-related cardiac arrest (aHR 11.5 [95% CI 2.51-52.43], p = 0.0017), duration of cardiopulmonary resuscitation (aHR 1.05 [95% CI 1.03-1.07], p < 0.0001) and SOFA score at day 1 (aHR 1.2 [95% CI 1.11-1.3], p < 0.0001).ConclusionsIn this large multicenter cohort, freshwater drowning patients had a poorer prognosis than saltwater drowning patients. Reasons for such discrepancies include differences in underlying psychiatric comorbidity, drowning circumstances and severities. Patients with initial cardiac arrest secondary to drowning remain with a very poor prognosis.© 2021. The Author(s).

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