The purpose of this method study in healthy volunteers is to determine the extent of sensory block following Transversus Abdominis Plane (TAP) block with 24 hours infusion of ropivacaine versus infusion of saline. Furthermore, to determined the analgesic effect of the TAP block and the influence on the lung function.
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Change in extend of sensory block from baseline (pre block) to 24 hours post block, based on 6 measurements
Timeframe: -15 min., 1, 4, 8, 12 and 24 hours following TAP block