Piperacllin Versus Placebo in Patients Undergoing Surgery for Acute Cholecystitis
Piperacllin Versus Placebo in Patients Undergoing Surgery for Acute Cholecystitis
The benefit from antibiotic prophylaxis in patients undergoing laparoscopic cholecystectomy
 for acute cholecystitis is insufficiently known. The aim of the present double-blind
 randomized controlled is to compare piperacilin with placebo in patients undergoing
 cholecystectomy for acute cholecystitis with anamnesis not exceeding 5 days. Altogether 100
 patients are intended to be included. Primary endpoint is biliary contamination. Secondary
 endpoints are postoperative hospital stay, health-related quality of life, pain perception,
 postoperative markers of inflammatory response, surgical site infections, infectious
 complications other than surgical site infections, health economy and relationship between
 symptom anamnesis and bile contamination.
Background

 Inflammation in the gallbladder due to obstruction of gallstones (acute cholecystitis) is a
 common condition and one of the most common indications for laparoscopic cholecystectomy. In
 most cases, the procedure may be performed without great risk of severe complications. In
 some cases, however, the congested bile in the gallbladder may become infected.

 In clinical routine, acute cholecystitis is often managed as an infectious condition, despite
 the fact that previous studies have shown that the bile in most cases of acute cholecystitis
 is sterile. On the other hand, antibiotic prophylaxis may reduce the risk of surgical site
 infections in those cases when there is a manifest bacterial contamination and, perhaps, also
 reduce the risk of contamination. There is firm evidence supporting acute surgery,
 prefereably laparoscopic cholecystectomy, but the benefit from antibiotic treatment has not
 been full evaluated.

 Previous studies have shown that the benefit from antibiotic prophylaxis is very limited in
 case of laparoscopic cholecystectomy for uncomplicated gallstone disease. There are, however,
 very few studies that have assessed antibiotic prophylaxis in surgery for acute
 cholecystitis.

 The aim of the present study is to assess the benefit of antibiotic prophylaxis in patients
 undergoing laparoscopic cholecystectomy for acute cholecystitis.

 Methods The study is based on patients admitted for acute cholecystitis at the department of
 acute surgery, Karolinska University Hospital Huddinge. In case the patients fulfill the
 inclusion critera and are suitable for laparoscopic surgery, written and oral information
 about the study is given.

 In case they agree to participate in the study, treatment allocation is determined by a
 sealed envelope system. The patients are randomised to receive either Piperacillin 4g x 3 iv
 preoperatively as prophylaxis or placebo (saline infusion). The study is double-blind.
 Piperacillin/placebo is administrated by a research nurse after allocation. The infusion is
 covered by a bag in order to maintain blinding. Neither the surgeon performing the procedure,
 nor the patient or staff caring for the patient are informed about the allocation. The
 procedure should be performed within 24 days after inclusion. Administration of
 Piperacillin/placebo is started immediately after inclusion and continued until the procedure
 is completed.

 If a categorical indication for antibiotic treatment occurs during surgery, the allocated
 infusion is removed and the patient is given antibiotic as decided by the surgeon. In such
 cases, the patient stays in the study and is analysed according to an intention to treat.

 During the laparoscopic cholecystectomy, at least 10 cc of bile is aspirated under sterile
 conditions from the fundus of the gallbladder with a long needle before the start of the
 peritoneum dissection. The bile is sent for aerobic and anaerobic culture. Bacteria are
 identified using standard laboratory procedures.

 Sample size estimation If the incidence of positive cultures is 50% and in the placebo group
 and this is reduced to 25% if antibiotic prophylaxis is given, 36 patients in each arm would
 be required in order to reach 80% chance of detecting this difference at a p<0.05 level of
 significance (one sided test). A total sample of 100 patients should thus be sufficient to
 test the primary outcome measure.

 Follow-up Samples for CRP, interleukins, bilirubin, AST, ALT and ALP are taken daily from the
 peroperative day until postoperative day 2.

 Quality of life is assessed by SF-36 preoperatively. Level of pain is estimated based on the
 MacGill Pain Questionnaire from the day of the procedure until postoperative day 2.

 One month postoperatively, the patient is invited to follow-up. At follow-up, SF-36 is filled
 in.
Inclusion Criteria:

 -  Clinical and radiologic signs of acute cholecystitis

 -  First acute symptoms occurring within five days before surgery

 Exclusion Criteria:

 -  Anamnesis exceeding five days

 -  Any contraindication for laparoscopic surgery

 -  Allergy against beta-lactame antibiotics