• Bas van Zaane, Wilton A van Klei, Wolfgang F Buhre, Peter Bauer, E Christiaan Boerma, Andreas Hoeft, Philipp Metnitz, Rui P Moreno, Rupert Pearse, Paolo Pelosi, Michael Sander, Benoit Vallet, Ville Pettilä, Jean-Louis Vincent, Andrew Rhodes, and European Surgical Outcomes Study (EuSOS) group for the Trials groups of the European Society of Intensive Care Medicine and the European Society of Anaesthesiology.
• From the Department of Anaesthesiology, University Medical Centre Utrecht, Utrecht (BVZ,WAVK), Department of Anaesthesiology, Maastricht University Medical Centre, Maastricht, the Netherlands (WFB), Section of Medical Statistics, Medical University of Vienna, Vienna, Austria (PB), Department of Intensive Care, Medical Centre Leeuwarden, Leeuwarden, the Netherlands (ECB), Department of Anaesthesiology, University of Bonn, Bonn, Germany (AH), Department of General Anaesthesiology, Emergency and Intensive Care Medicine, Medical University of Graz, Graz, Austria (PM), UCINC, Hospital de São José, Centro Hospitalar de Lisboa Central, EPE, Lisbon, Portugal (RPM), Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Department of intensive care, London, UK (RP), IRCCS AOU San Martino-IST (RP), Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Genova, Italy (PP), Charité-Universitaetsmedizin, Department of Anaesthesiology (MS), Anaesthesiology and Critical Care, University Hospital Lille, Lille, France (BV), Intensive Care Units, Helsinki University Hospital, Helsinki, Finland (VP), Erasme Hospital, Université Libre de Bruxelles, Brussels, Belgium (J-LV), and St George's Healthcare NHS Trust, London, UK (AR) *Members listed in appendix I, http://links.lww.com/EJA/A68.
• Eur J Anaesthesiol. 2015 Jul 1; 32 (7): 477-85.

BackgroundEvidence suggests that sleep deprivation associated with night-time working may adversely affect performance resulting in a reduction in the safety of surgery and anaesthesia.ObjectiveOur primary objective was to evaluate an association between nonelective night-time surgery and in-hospital mortality. We hypothesised that urgent surgery performed during the night was associated with higher in-hospital mortality and also an increase in the duration of hospital stay and the number of admissions to critical care.DesignA prospective cohort study. This is a secondary analysis of a large database related to perioperative care and outcome (European Surgical Outcome Study).SettingFour hundred and ninety-eight hospitals in 28 European countries.PatientsMen and women older than 16 years who underwent nonelective, noncardiac surgery were included according to time of the procedure.InterventionNone.Main Outcome MeasuresPrimary outcome was in-hospital mortality; the secondary outcome was the duration of hospital stay and critical care admission.ResultsEleven thousand two hundred and ninety patients undergoing urgent surgery were included in the analysis with 636 in-hospital deaths (5.6%). Crude mortality odds ratios (ORs) increased sequentially from daytime [426 deaths (5.3%)] to evening [150 deaths (6.0%), OR 1.14; 95% confidence interval 0.94 to 1.38] to night-time [60 deaths (8.3%), OR 1.62; 95% confidence interval 1.22 to 2.14]. Following adjustment for confounding factors, surgery during the evening (OR 1.09; 95% confidence interval 0.91 to 1.31) and night (OR 1.20; 95% confidence interval 0.9 to 1.6) was not associated with an increased risk of postoperative death. Admittance rate to an ICU increased sequentially from daytime [891 (11.1%)], to evening [347 (13.8%)] to night time [149 (20.6%)].ConclusionIn patients undergoing nonelective urgent noncardiac surgery, in-hospital mortality was associated with well known risk factors related to patients and surgery, but we did not identify any relationship with the time of day at which the procedure was performed.Trial RegistrationClinicaltrials.gov identifier: NCT01203605.

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