RESUMEN
The aim of this study was to test the hypothesis that blockade of nociceptive input with lidocaine 1%, bupivacaine 0.5% and ropivacaine 0.5% during tonsillectomy could decrease both the dose of inhalational anesthetic intraoperatively and the pain beyond the immediate postoperative period. Sixty patients between the ages of 6 and 12 years scheduled for tonsillectomy with or without adenoidectomy were randomly divided into four groups. Anesthesia was induced in all groups with 7 mg/kg thiopentone and 1.5 mg/kg succinyl choline. The results showed that after the preincisional infiltration with ropivacaine 0.5%, bupivacaine 0.5% and lidocaine 1%, the operation could be achieved under light general anesthesia using only halothane 0.5% concentration in oxygen with reduced recovery times