Anaesthesia
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Ten patients, undergoing elective orthopaedic surgery under spinal anaesthesia, were sedated with propofol using a closed-loop feedback control system. The bispectral index (BIS), a new processed EEG parameter, was used as control variable. ⋯ This feedback control system for propofol administration proved to be adequate and safe. BIS was found to be well suited as control variable.