Assessment of the preoperative education on pain after outpatient surgery to remove the gallbladder

INTERVENTION: 1. Patients in the study group will receive preoperative information about all the proceedings and post operative treatments by the education nurse. 2. Patients in the control group will receive conventional information about laparoscopic cholecystectomy. CONDITION: Postoperative pain and quality of life ; Surgery ; Postoperative pain PRIMARY OUTCOME: Postoperative pain related, measured using the visual analogue scale (VAS), at the immediate postoperative time, at 6 postoperative hours, at 24 hours, 7 days and 30 days SECONDARY OUTCOME: 1. Postoperative nausea, measured by questioning the patient at the immediate postoperative time, at 6 postoperative hours, at 24 hours, 7 days and 30 days; 2. Intraoperative morbidity, measured by Clavien‐Dindo classification at 30 days; 3. Postoperative morbidity, measured by Clavien‐Dindo classification at 30 days; 4. Unexpected admissions; 5. Time to return to normal work activity, measured by questioning the patient at 30 days; 6. Patient satisfaction, measured by Satisfaction Test especifically designed at preoperative and 30 days postoperative; 7. Quality of life, measured by SF‐12 Quality of Life Test at preoperative and 30 days postoperative INCLUSION CRITERIA: 1. Age 18–75 years old 2. American Society of Anesthesiology (ASA) scores I and II 3. Ambulatory surgery criteria: 30 minutes proximity to the hospital, living with family and telephone at home 4. Patient acceptance for ambulatory surgery 5. Symptomatic cholelithiasis or chronic cholecystitis 6. Liver enzymes and bilirubin within normal ranges 7. No previous supramesocolic surgery