A survey of antimicrobial prophylaxis in elective colorectal surgery in New Zealand

Antimicrobial prophylaxis in surgery: an international survey

BACKGROUND

We investigated current clinical practice of antimicrobial prophylaxis (AMP) in surgery.

METHODS

Survey administration of AMP to patients without co-morbidity or allergy undergoing surgery, among surgeons indexed as corresponding authors for articles published in general surgery, orthopedics, gynecology, and cardiac surgery journals.

RESULTS

A total of 1,068 surgeons answered (response rate 68%). Of these, 26.1% do not begin infusion of the first antimicrobial dose within 1 h of incision, as suggested by guidelines, and 27.2% continue administering AMP for two or more days after surgery, including 7.6% who continue for four to seven days, in contradiction to the guidelines. There were significant differences between Europe and North America in the selection of AMP regimens. Furthermore, 19% of Europeans order infusion of the first antimicrobial dose during the incision compared with 3.9% of North Americans; 74.2% of Europeans discontinue AMP within 24 h after surgery compared with 86% of North Americans. Finally, 31% of general surgeons in North America administer supplementary oral prophylaxis for colectomy compared with only 5% of European surgeons.

CONCLUSIONS

The AMP strategies in day-to-day self-reported practice differ significantly. Uniform, evidence-based practice is warranted, especially in this era of increasing antimicrobial resistance.

Randomized Clinical Trial Comparing Intravenous Antimicrobial Prophylaxis Alone with Oral and Intravenous Antimicrobial Prophylaxis for the Prevention of a Surgical Site Infection in Colorectal Cancer Surgery

PURPOSE

The use of preoperative oral antibiotics during preparation for elective colorectal surgery remains controversial. This was a prospective randomized clinical trial to compare the efficacy of intravenous antimicrobial prophylaxis alone with combined oral and intravenous antimicrobial prophylaxis for surgical site infection (SSI) in patients undergoing elective colorectal surgery.

METHODS

Five hundred patients were enrolled in this study. Of these, 491 were randomly assigned to receive either intravenous antimicrobial prophylaxis or combined oral and intravenous antimicrobial prophylaxis. The primary outcome was the incidence of SSI within 6 weeks of elective colorectal surgery.

RESULTS

The incidence of SSI was similar in the two treatment groups: intravenous alone, 10.7%; and oral and intravenous, 7.0% (difference 3.7%; 95% confidence interval -4.8% to 5.6%). No critical adverse events were reported.

CONCLUSION

The addition of oral antibiotics to intravenous antimicrobial prophylaxis showed no advantage in the prevention of SSI.

The use and abuse of antibiotics in elective colorectal surgery: The Saga Continues…

BACKGROUND

The role of antibiotic prophylaxis in preventing post-operative complications in patients undergoing elective colorectal surgery is well established. Despite evidence that a single-dose prophylaxis is sufficient, the duration of antibiotic use in clinical practice is highly variable and surveys have identified persistent patterns of antibiotic abuse in elective colorectal surgery.

MATERIALS AND METHODS

We conducted a retrospective review of all patients who underwent elective colorectal surgery between 1998 and 2002 at the American University of Beirut Medical Center. A survey among general surgeons in Lebanon was also performed to investigate the pattern of antibiotic prophylaxis used in such cases. The MEDLINE database (1966-2004) was searched for English-language articles and abstracts on antimicrobial use in elective colorectal surgery. Papers cited in relevant primary articles were also reviewed. Data were extracted and reviewed by all authors.

RESULTS

Two hundred and eleven matching patient-records were identified. A triple regimen including metronidazole, ampicillin and an aminoglycoside was the most commonly used preoperative prophylactic method. Patients received post-operative antibiotics for a mean of 6.66+/-2.62 days. The mean duration of post-operative antibiotic prophylaxis used by the interviewed surgeons was 4.31+/-1.08 days.

CONCLUSIONS

Our study confirms that even when strong evidence exists, surgeons fail to adhere to antibiotic prophylaxis guidelines. This pattern is not unique to Lebanon but is shared to a large extent by surgeons around the world. Adherence to published guidelines and improved education of surgeons are essential to the delivery of cost-effective medical practice.

Surgical antibiotic prophylaxis: effect in postoperative infections

OBJECTIVE

to assess the risk of surgical wound infection and hospital acquired infections among patients with and without adequate antibiotic prophylaxis. Also, to provide models to predict the contributing factors of hospital infection and surgical wound infection.

DESIGN

survey study. Prospective cohort study over 14 months, with data collected by a nurse and a epidemiologist through visits to the surgical areas, a review of the medical record and consultation with the medical doctor and nurses attending the patients.

SETTING

Two hundred and fifty bed, general hospital serving Puertollano (Ciudad Real), population--50,000.

RESULTS

between February 1998 and April 1999, 754 patients underwent surgery, 263 (34.88%) received appropriate perioperative prophylaxis while 491 (65.12%) received inadequate prophylaxis. For those who received adequate antibiotic prophylaxis, the percentage of nosocomial infection was 10.65% compared with the group who received inadequate prophylaxis in which the percentage of nosocomial infection was 33.40%. The relative risk of nosocomial infection was, therefore, 4.21 times higher in the latter group (confidence intervals 95%: 2.71-6.51). A patient in the inadequate prophylaxis group had a 14.87% chance of wound infection while a patient in the adequate prophylaxis group had a 4.56% chance of wound infection. The relative risk of wound infection was 3.65 times higher in the group that received inadequate prophylaxis (confidence intervals 95%: 1.95-6.86). The final regression logistic model to assess nosocomial infection incorporated seven prognostic factors: age, length of venous periferic route, vesicle catheter, duration of operation, obesity, metabolic or neoplasm diseases and adequate or inadequate prophylaxis. When we incorporated these variables in the multi-factorial analysis we found that the relative risk of developing nosocomial infection was 2.33 times higher in the group which received inadequate prophylaxis. When we applied the second logistic multiple regression model (wound infection), we discovered that the probability of developing surgical wound infection was 2.32 times higher in the group which received inadequate prophylaxis as opposed to the group, which received adequate prophylaxis. The goodness of fit (Hosmer-Lemeshow test) showed a correct significance in all models.

CONCLUSIONS

a multi-factorial analysis was applied to identify the high-risk patients and the risk factors for postoperative infections. Through the application of these multiple regression logistic models, we conclude that the correct antibiotic prophylaxis is effective and will subsequently reduce postoperative infection rates, especially in high-risk patients. Therefore, the choice of antimicrobial agent should be made on the basis of the criteria of hospital committee.

Colorectal resection in Victoria:a comparison of hospital based and individual audit

BACKGROUND

The results of personal audit have not been tested against a hospital-based audit previously and the results of two such audits of colorectal resection in the State of Victoria have provided this opportunity. In addition, data reflecting the results of colorectal resection across a range of hospitals and surgeons in the Victorian community have been obtained.

METHODS

A total of 535 patients undergoing a colorectal resection, with an anastomosis performed, were studied in two serially conducted prospective audits arranged by the Standards Sub-Committee of the Victorian State Committee. One study was public hospital-based and the second was based on voluntary reporting by individual surgeons.

RESULTS

Similar results were obtained in each study, demonstrating the accuracy of individual reporting. The combined results (wound infection rate 12.3%, anastomotic leak rate 3.7% and mortality 4.5%) are compared to previously published data.

CONCLUSIONS

In the State of Victoria the results of audit by individual surgeons performing colorectal resection were similar to the hospital-based audit. The results obtained compare favourably with previously published data.