AIM:To investigate if antibiotics administered within 8 h of endoscopy reduce mortality or increase the incidence of Clostridium difficile infection(CDI).METHODS:A 2-year retrospective analysis of all patients who presented with first variceal hemorrhage was undertaken.The primary outcome measure was 28-d mortality.Secondary outcome measures were 28-d rebleeding rates and 28-d incidence of CDI.All patients were admitted to a tertiary liver unit with a consultantled,24-h endoscopy service.Patients received standard care including terlipressin therapy.Data collection included:primary and secondary outcome measures,timing of first administration of intravenous antibiotics,eti-ology of liver disease,demographics,endoscopy details and complications.A prospective study was undertaken to determine the incidence of CDI in the study population and general medical inpatients admitted for antibiotic therapy of at least 5 d duration.Statistical analysis was undertaken using univariate,non-parametric tests and multivariate logistic regression analysis.RESULTS:There were 70 first presentations of variceal hemorrhage during the study period.Seventy percent of cases were male and 65.7% were due to chronic alcoholic liver disease.In total,64/70(91.4%) patients received antibiotics as prophylaxis during their admission.Specifically,53/70(75.7%) received antibiotics either before endoscopy or within 8 h of endoscopy [peri-endoscopy(8 h) group],whereas 17/70(24.3%) received antibiotics at > 8 h after endoscopy or not at all(non peri-endoscopy group).Overall mortality and rebleeding rates were 13/70(18.6%) and 14/70(20%),respectively.The periendoscopy(8 h) group was significantly less likely to die compared with the non peri-endoscopy group [13.2% vs 35.3%,P = 0.04,odds ratio(OR) = 0.28(0.078-0.997)] and showed a trend towards reduced rebleeding [17.0% vs 29.4%,P = 0.27,OR = 0.49(0.14-1.74)].On univariate analysis,the non peri-endoscopy group [P = 0.02,OR = 3.58(1.00-12.81)],higher model for end-stage liver disease(MELD) score(P = 0.02),presence of hepatorenal syndrome [P < 0.01,OR = 11.25(2.24-56.42)] and suffering a clinical episode of sepsis [P = 0.03,OR = 4.03(1.11-14.58)] were significant predictors of death at 28 d.On multivariate logistic regression analysis,lower MELD score [P = 0.01,OR = 1.16(1.04-1.28)] and periendoscopy(8 h) group [P = 0.01,OR = 0.15(0.03-0.68)] were independent predictors of survival at 28 d.The CDI incidence(5.7%) was comparable to that in the general medical population(5%).CONCLUSION:Antibiotics administered up to 8 h following endoscopy were associated with improved survival at 28 d.CDI incidence was comparable to that in other patient groups. A: To investigate if antibiotics administered within 8 h of endoscopy reduce mortality or increase the incidence of Clostridium difficile infection (CDI). METHODS: A 2-year retrospective analysis of all patients who presented with first variceal hemorrhage was carried. The primary outcome measure was 28-d mortality. Secondary outcome measures were 28-d rebleeding rates and 28-d incidence of CDI. All patients were admitted to a tertiary liver unit with a consultantled, 24-h endoscopy service. Patients received standard care including terlipressin therapy. Data collection included: primary and secondary outcome measures, timing of first administration of intravenous antibiotics, eti-ology of liver disease, demographics, endoscopy details and complications. A prospective study was undertaken to determine the incidence of CDI in the study population and general medical inpatients admitted for antibiotic therapy of at least 5 d duration. Statistical analysis was carried using univariate, non-parametr ic tests and multivariate logistic regression analysis. RESULTS: There were 70 first presentations of variceal hemorrhage during the study period. Eventy percent of cases were male and 65.7% were due to chronic alcoholic liver disease. In total, 64/70 (91.4%) Patients received antibiotics as prophylaxis during their admission. Specifically, 53/70 (75.7%) received antibiotics either before endoscopy or within 8 h of endoscopy [peri-endoscopy (8 h) group], while 17/70 (24.3%) received antibiotics Overall rigidity and rebleeding rates were 13/70 (18.6%) and 14/70 (20%), respectively. Each periendoscopy (8 h) group was significantly less likely to die compared with the non peri-endoscopy group [13.2% vs 35.3%, P = 0.04, odds ratio (OR) = 0.28 (0.078-0.997)] and showed a trend towards reduced rebleeding [17.0% vs 29.4% , OR = 0.49 (0.14-1.74)]. On univariate analysis, the non-peri-endoscopy group [P = 0.02, OR = 3.58 (1.00-12.81)], higher modePresence of hepatorenal syndrome (P <0.01, OR = 11.25 (2.24-56.42)] and suffering a clinical episode of sepsis [P = 0.03, OR = 4.03 (1.11-14.58)] were significantly predictors of death at 28 d. On multivariate logistic regression analysis, lower MELD score [P = 0.01, OR = 1.16 (1.04-1.28)] and periendoscopy (8 h) OR = 0.15 (0.03-0.68)] were independent predictors of survival at 28 days. The CDI incidence (5.7%) was comparable to that in the general medical population (5%). CONCLUSION: Antibiotics administered up to 8 h following endoscopy were associated with improved survival at 28 d.CDI incidence was comparable to that in other patient groups.