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Continuous measurement of o-toluidine concentrations in breath by PTR-ToF-MS over 120 min (above) for two single pigs (blue line group A (intravenous injection of prilocaine), red line group B (cervical plexus regional anaesthesia with prilocaine)). Each data point represents mean concentrations over one minute. The diagrams at the bottom show the first 20 min. Bolus was administered at the third minute.
