The aim of the present study was to determine the intrathecal bioavailability of a mixture of lidocaine and bupivacaine in a rabbit model of spinal anesthesia by using the microdialysis technique. Catheter and microdialysis probe were inserted under control of the view either in the epidural or in the intrathecal space. First, the epidural disposition of the mixture of bupivacaine and lidocaine was studied after epidural administration.
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