The goal of this randomised trial is to use a short acting local anaesthetic drug (hyperbaric prilocaine 2%) which is beneficial in short operations which are performed as a day case surgery. in this study the investigators will use 3 different doses of prilocaine 2% (40,50 or 60 mg ) intrathecal (in spinal anaesthesia) in participants undergoing arthroscopy on the knee. the primary outcome is to compare time to micturate (go to the bathroom) between the three groups . the secondary outcomes are: * time to recovery of the motor and sensory block * time to discharge from post anesthesia care unit * any complications ; itching, lowered blood pressure, nausea and vomiting.
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Time to void; time from spinal anaesthesia to first void
Timeframe: from time of spinal anaesthesia as a start point till time for the participant to get up and micturate on his own (time to first void) assessed up to 4 hours postoperative