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Several reports have compared the duration of action of levobupivacaine and ropivacaine as local anesthetic. The most widely used method for sensory function evaluation is though means of a pinprick test. The investigators want to use the novel method of Quantitative Sensory Testing to better evaluate the anesthetic activity. This method used hot and cold sensation to assess small nerve fiber function. The investigators will assess the duration of action of different drugs when used in an inter scalene nerve block in patients scheduled for shoulder surgery.
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This study aims to compare the length of the analgesic effect of different local anesthesic solutions, used in an interscalene nerve block. This will be objectified by measuring the changes in small nerve functioning, using quantative sensory testing. Based on the results of a previous study, the investigators reduce the dose of the administered local anesthetic, expecting a similar length of action using these smaller doses.
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30 participants in 3 patient groups
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Data sourced from clinicaltrials.gov
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