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[Optimization of local anesthesia in ambulatory surgery].

The optimization of local anesthesia will be one essential condition to enlarge and improve the ambulatory surgery and its acceptation by the patients. Indication to local anesthesia can be increased by prolongation of its duration through adjunction of adrenaline to lidocaine at a 1:200,000 concentration and by diminishing injection-related pain through buffering the anesthetic solution with a 8.4% sodium bicarbonate solution at a concentration of 1 ml to 10 ml of lidocaine. However, this preparation is unstable and must be utilized within a few days.