• Palle Toft, Hanne Tanghus Olsen, Helene Korvenius Jørgensen, Thomas Strøm, Helle Lykkeskov Nibro, Jacob Oxlund, Karl-Andre Wian, Lars Marius Ytrebø, Bjørn Anders Kroken, and Michelle Chew.
• Department Anaesthesiology and Intensive Care, Odense University Hospital, Sdr, Boulevard 29, DK - 5000 Odense C, Denmark. Palle.Toft@rsyd.dk.
• Trials. 2014 Jan 1;15:499.

BackgroundThrough many years, the standard care has been to use continuous sedation of critically ill patients during mechanical ventilation. However, preliminary randomised clinical trials indicate that it is beneficial to reduce the sedation level. No randomised trial has been conducted comparing sedation with no sedation, a priori powered to have all-cause mortality as primary outcome.The objective is to assess the benefits and harms of non-sedation versus sedation with a daily wake-up trial in critically ill patients.Methods/DesignThe non-sedation (NONSEDA) trial is an investigator-initiated, randomised, clinical, parallel-group, multinational trial designed to include 700 patients from at least six ICUs in Denmark, Norway and Sweden.Inclusion criteria are mechanically ventilated patients with expected duration of mechanical ventilation >24 hours.Exclusion criteria are non-intubated patients, patients with severe head trauma, coma at admission or status epilepticus, patients treated with therapeutic hypothermia, patients with PaO2/FiO2 < 9 where sedation might be necessary to ensure sufficient oxygenation or place the patient in prone position.Experimental intervention is non-sedation supplemented with pain management during mechanical ventilation.Control intervention is sedation with a daily wake-up trial.The primary outcome will be all cause mortality at 90 days after randomization. Secondary outcomes will be: days until death throughout the total observation period; coma- and delirium-free days; highest RIFLE score; days until discharge from the intensive care unit (within 28 days); days until the participant is without mechanical ventilation (within 28 days); and proportion of patients with a major cardiovascular outcome. Explorative outcomes will be: all cause mortality at 28 days after randomisation; days until discharge from the intensive care unit; days until the participant is without mechanical ventilation; days until discharge from the hospital; organ failure.Trial size: we will include 700 participants (2 × 350) in order to detect or reject 25% relative risk reduction in mortality with a type I error risk of 5% and a type II error risk of 20% (power at 80%).DiscussionThe trial investigates potential benefits of non-sedation. This might have large impact on the future treatment of mechanically ventilated critically ill patients.Trial RegisterClinicalTrials.gov NCT0196768, 09.01.2014.

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