During laparoscopy, administration of cold and dry carbon dioxide (CO2) leads to hypothermia. Different types of gas conditioning have been studied in order to prevent this specific hypothermia. Intra-abdominal administration of local anesthetics has also been studied in order to prevent post-operative pain. In both cases, some results have been described. The investigators propose to evaluate in a prospective, randomized, double blind trial, the impact of 4 different types of conditioning of insufflated gas during laparoscopy for womb surgery on hypothermia prevention and post-operative pain. These 4 types of gas conditioning are: * CO2 wet and cold with nebulized Nacl and direct intra-abdominal administration of Nacl * CO2 wet and cold with nebulized ropivacaïne 0.75% and direct intra-abdominal administration of Nacl * CO2 dry and cold with direct intra-abdominal administration of ropivacaïne 0.2% * CO2 dry and cold with direct intra-abdominal administration of Nacl The investigators use a new device (Aeroneb® Pro \[Aerogen® Company\]) which can wet (by nebulization) the insufflated gas and therefore permits intraperitoneal medicament administration (local anesthetics).
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Evolution of core temperature
Timeframe: From the beginning of the anesthetic procedure to the discharge of the recovery room.
Post-operative pain
Timeframe: From the arrival in the recovery room to the 6th post-operative day.