Closed loop systems for anaesthesia have been shown to be more efficient than manual administration and than Target Control Infusion systems (TCI). So far, there is only one single-center study demonstrating that a system using simultaneously three closed loops for each component of anaesthesia (hypnosis, analgesia and muscle relaxation) is possible, safe and is more efficient than manual administration of anaesthetic drugs. Although the results of this study are very encouraging, they are limited by its sample of patients recruited for non-cardiac surgery only.