• Pascal Caillet, Cécile Payet, Stéphanie Polazzi, Matthew J Carty, Jean-Christophe Lifante, and Antoine Duclos.
• Hospices Civils de Lyon, Pôle Information Médicale Evaluation Recherche, Lyon, F-69003, France; INSERM Research Unit 1033, Lyon, F-69003, France; Université Claude Bernard Lyon 1, Health Services and Performance Research Lab, Lyon, F-69003, France.
• Plos One. 2015 Jan 1; 10 (9): e0137754.

AbstractSurgical safety during vacation periods may be influenced by the interplay of several factors, including workers' leave, hospital activity, climate, and the variety of patient cases. This study aimed to highlight an annually recurring peak of surgical mortality during summer in France and explore its main predictors. We selected all elective of open surgical procedures performed in French hospitals between 2007 and 2012. Surgical mortality variation was analyzed over time in relation to workers leaving on vacation, the volume of procedures performed by hospitals, and temperature changes. We ran a multilevel logistic regression for exploring the determinants of surgical mortality, taking into account the clustering of patients within hospitals and adjusting for patient and hospital characteristics. A total of 609 French hospitals had 8,926,120 discharges related to open elective surgery. During 6 years, we found a recurring mortality peak of 1.15% (95% CI 1.09-1.20) in August compared with 0.81% (0.79-0.82, p<.001) in other months. The incidence of worker vacation was 43.0% (38.9-47.2) in August compared with 7.3% (4.6-10.1, p<.001) in other months. Hospital activity decreased substantially in August (78,126 inpatient stays, 75,298-80,954) in relation to other months (128,142, 125,697-130,586, p<.001). After adjusting for all covariates, we found an "August effect" reflecting a higher risk to patients undergoing operations at this time (OR 1.16, 95% CI 1.12-1.19, p<.001). The main study limitation was the absence of data linkage between surgical staffing and mortality at the hospital level. The observed, recurring mortality peak in August raises questions about how to maintain hospital activity and optimal staffing through better regulation of human activities.

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