L Group - General anesthesia willl be induced with propofol 2 mg mg. kg-1 and alfentanyl 30 mcg.kg-1. Once an appropriate depth of anesthesia had been obtained, a laryngeal mask airway (LMA) will be positioned. The anesthesia will be maintained by propofol 4 to 5 mg. kg-1.h-1. Ventilation will be controlled by adjusting the flow volume and respiratory rate to keep the end-tidal CO2 level (PETCO2) between 30 and 40 mmHg. For local anesthesia, approximately 50 ml of 0.5% ropivacaine will be infiltrated along the line of incision in the subcutaneous plane, followed by peripheral nerve block technique (e.g., ilioinguinal-hypogastric nerve block) and local wound infiltration at the fascial level. Failure of local anesthesia will be defined as the presence of movements, sweating, tachycardia or blood pressure increase >10% of the pre-induction value with the beginning of the surgery. In these cases further infiltration of additional 10 mL of 0.5% ropivacaine will be allowed. At the end of the surgery, propofol will be discontinued and the LMA removed whenever the patients resume adequate spontaneous breathing.