RESULTS OBTAINED FOR PICO QUESTION 1
In adult patients with CDAD (P), does early surgery (I) compared with late surgery (C) (as defined by the need for vasopressors) decrease mortality rates (O)?
Overall surgical mortality was 19% to 80% in the included studies (Table 1). Seder et al.54 described 6,841 patients with CDAD and showed a decreased mortality associated with surgery before the development of the vasopressor requirement. The experience of Hall et al.38 with 3,237 consecutive cases of CDAD showed an increased mortality rate when surgical exploration was performed after intubation or the development of respiratory failure and the use of vasopressors.
Longo et al.47 found that peritonitis and bowel perforation indicative of delayed surgical therapy were associated with increased mortality rates. Delaying surgery until after the development of respiratory failure, defined as unplanned intubation, was found to result in increased mortality rates in six articles,4,9,38,44,54,57 while similar findings were noted in four studies when surgical intervention followed renal failure.38,44,54,57 Finally, in 10 studies, delaying surgery until the patient became hemodynamically unstable and required vasopressors was associated with increased mortality rates.4,9,10,32,38,39,44,48,52,54,57 Overall, these studies suggested that early surgery before the development of shock or organ failure was associated with lower mortality rates in patients with CDAD.
While most studies do not address a specific period in which surgery should be considered, a few studies suggest that the window for optimal surgical management is relatively short. In the study of Ali et al.,32 survivors had surgery at a mean of 3.2 days, compared with nonsurvivors at 5.4 days. Sailhamer et al.9 similarly showed that of patients admitted to the ICU for CDAD, mean time to the operating room for survivors was 1.9 days compared with a mean time of 3.9 days for nonsurvivors. The most recent article addressing the association with mortality and specific timing of surgery in patients with CDAD was published in November 2013.57 Halabi et al.57 retrospectively reviewed the Nationwide Inpatient Sample from 2001 to 2010 for colectomy in patients with C. difficile colitis and the association with mortality. The overall mortality associated with colectomy was 30.7%. Surgical intervention delayed for more than 3 days after admission in patients with CDAD was associated with higher mortality rates (odds ratio, 1.09; 95% CI, 1.05–1.14; p < 0.05).
Quantitative Synthesis (Meta-analysis)
Before pooling study data, we assessed methodological and clinical heterogeneity across the studies and found variability in how the intervention and comparator were defined. The most commonly defined measure of early versus late surgery was progression to the need for vasopressors. With the use of this definition, eight studies were included in the meta-analysis. We found that early surgery was associated with reduced mortality rates with an RR of 0.50 (95% CI, 0.35–0.72; Fig. 2). Of note, the I2 statistic was 39%, falling into the “low” heterogeneity category, indicating that the studies were comparable.
Grading the Evidence
With the use of the GRADE framework for assessing the outcome of reduced mortality rates, no serious risk of bias, inconsistency, indirectness, or publication bias was found. However, severe imprecision was noted since the studies were small and the CIs were large. Starting from observational studies (which are considered low quality), we then rated down for imprecision. Therefore, the overall quality of evidence was very low (see the GRADE profile shown in Fig. 3).
Early surgery for patients with fulminant CDAD is associated with reduced mortality rates. In the absence of validated prediction scores, determining which CDAD patients will progress to shock can be difficult to elucidate. However, the early signs of hemodynamic stability, such as low mean arterial pressures or decreasing urine output, can potentially serve as triggers for the need for surgical intervention (early surgery) before the development of multiorgan system failure or shock.
Using hemodynamic instability as the trigger for surgical intervention is associated with increased mortality, and patients should proceed to surgery before progression to shock. Although an exact time frame is unclear, the current data suggest that this is usually within 3 days to 5 days after diagnosis if patients are worsening or not clinically improving. While this is not a definite time frame, it may be helpful to guide clinicians in identifying patients prospectively who are at risk for proceeding to hemodynamic instability. We anticipate that this will be enhanced in the future as a physiologic scoring system is refined.8
Within the GRADE framework, once the overall quality of evidence across studies and outcomes is determined, the guideline panel will make a recommendation that considers the following: quality of the body of evidence, patients’ values and preferences, and cost/resource use. Despite the overall quality of evidence being very low, the panel considered that most patients would place a high value on the potential 50% reduction in mortality and that the potential benefit outweighs any potential harm in performing surgery early. This allows for a strong recommendation. Within the GRADE framework, a strong recommendation implies that most individuals would want the recommended course of action and only a small proportion would not.12–14
RECOMMENDATION: In adult patients with CDAD, we strongly recommend that patients undergo surgery early, that is, before the development of shock or the need for vasopressors. This recommendation is based on very low quality evidence but considers that individual patients will place a high value on the overall benefit (reduced mortality rates).
RESULTS FOR PICO QUESTION 2
In adult patients with CDAD (P), does TAC (I) compared with other types of surgical intervention (C) decrease mortality rates (O)?
In some studies,4,5,31,32,37,38,41,43,47,48,52 total colectomy carried a higher mortality rate than partial colectomy, although this was not statistically significant. In these cases, it was not specified whether patients who underwent total colectomy were sicker or had extensive necrosis and tissue damage as an indication for total rather than partial colectomy. Several studies assigned mortality or survival to the initial procedure performed despite the fact that many patients were later converted to TAC (an intention-to-treat approach). These studies were likely confounded by timing, with later conversions to TAC representing a delay in appropriate treatment, thus assigning mortality inappropriately.
Klipfel et al.43 showed that CDAD and an acute abdomen is a lethal combination that carries an 80% mortality rate regardless of the procedure performed; however, a major limitation of these findings was that these patients received prolonged antibiotic treatments and that the decision for surgical intervention was purely subjective. Recognizing that the diagnosis and treatment of CDAD have evolved during the past two decades, the 1994 study by Lipsett et al.46 found that partial colectomy is uniformly fatal, with a mortality rate of 100% versus a mortality rate of 14% in patients undergoing total colectomy. In this series, a worse outcome was associated with the presence of peritonitis as shown in earlier studies.46
Quantitative Synthesis (Meta-analysis)
Although there was minimal methodological heterogeneity, there was some clinical heterogeneity because the comparator to TAC was not consistent across all studies. Of note, however, the number of patients undergoing procedures other than TAC or partial colectomy was quite low. The I2 statistic was “low” at 48%, although this is likely due to the wide CIs of each study rather than a true homogeneity between the studies.
Twenty studies compared total colectomy versus other procedures or no surgery as treatment for CDAD,4,5,10,31,32,34,35,37,38,41,43,44,46–49,52–56 17 of which had sufficient data for analysis. Because the ultimate procedure performed likely dictates prognosis, this was chosen for the comparison group.
When considering only the first procedure performed, mortality seemed to trend higher for TAC, with an RR of 1.11 (95% CI, 0.69–1.80). When taking into account that many patients were converted to TAC in a later operation, the point estimate actually switches sides, showing a slight change in results, with an RR of 0.86 (95% CI, 0.56–1.31). This is shown in Figure 4. Although neither reaches statistical significance (likely due to power), change in direction of the point estimate is compelling within the construct of evidence-based medicine.
A sensitivity analysis was performed on the subgroup of studies that reported conversion rates to investigate the potential confounding impact of the delay associated with first performing a procedure other than TAC. The ultimate procedure performed was compared with a best-case scenario where all patients who converted instead underwent TAC first and survived, compared with a worst-case scenario in which all patients who were converted underwent TAC first and died. In each case, the point estimate favored TAC, although the CIs crossed the null hypothesis (Fig. 5).
Grading the Evidence
With the use of the GRADE framework, no serious risk of bias, indirectness, or publication bias was detected; however, we rated down for inconsistency (which was apparent due to clinical heterogeneity and a borderline I2 statistic) and imprecision (due to few events and wide CIs) (Fig. 6).
In the worst-case scenario with the given data, total colectomy does not increase mortality. In the best-case scenario with the given data, total colectomy may decrease mortality. Many of the patients who ultimately died after total colectomy had significant delay in this procedure, with many first undergoing a more limited procedure, thus blunting the effectiveness of the total colectomy and making our positive estimate likely too conservative. In addition, in each of the studies, the proportion of patients undergoing less than a total colectomy is quite small. This likely reflects selection bias. Most of the studies suggest that the patients were quite different, with the patients undergoing total colectomy being much sicker, with having more comorbidities, thus having a higher baseline mortality.
A recent meta-analysis by Bhangu et al.58 showed a point estimate for total colectomy that was unfavorable. Because the CIs cross the null hypothesis and indicate no difference, they could only accurately conclude that total colectomy is a reasonable option. Their ultimate conclusion (in opposition to their point estimate) that total colectomy is superior and thus the procedure of choice was interestingly not supported by their meta-analysis.
In our meta-analysis, we considered that having multiple operations constituted a treatment failure at initial operation, such that the ultimate operation performed would have significant impact. When we explored this, we did indeed find that our effect estimate shifted to the other side, in favor of total colectomy. Although the null hypothesis is still included, the magnitude of the effect is a nearly 15% reduction in mortality, and that the effect changes direction is compelling. On subgroup analysis of the studies specifically reporting conversions from limited procedures to total colectomy, we find similar estimates, with sensitivity analysis considering best- and worst-case scenarios for mortality after conversion, maintaining a point estimate in favor of total colectomy.
While the overall body of evidence that informs this recommendation is very low, the authors took into account that potential confounding factors (i.e., delay in undergoing TAC as the procedure) could plausibly lead to an underestimated version of the true effect. In this case, that sicker patients (having failed the initial procedure) were converted to TAC but still seemed to fare better increases our confidence in the intervention.
In addition, the panel again considered patients’ values and preferences, noting that most patients would favor definitive treatment at the time of initial surgical intervention and in weighing the desirable and undesirable outcomes, they would again place a high value on one definitive treatment that could reduce their mortality. Taking into account all these factors, the panel voted for a conditional recommendation in favor of TAC.
RECOMMENDATION: In adult patients with CDAD undergoing surgery, we conditionally recommend total or subtotal colectomy (vs. partial colectomy or other surgery). This recommendation is based on very low-quality evidence but places a high value on patient preferences for a definitive surgical intervention that may more effectively reduce mortality rates.
A multi-institutional randomized controlled trial (ClinicalTrials.gov identifier NCT01441271) entitled “Optimal surgical treatment of fulminant Clostridium difficile colitis”59 was initiated to determine the best operative procedure for patients with CDAD. In this study, patients were intended to be randomized to ileostomy with colonic lavage versus total colectomy; however, the study was recently closed due to a lack of meaningful enrollment.
Neal et al.11 described an innovative procedure in which an ileostomy is created to allow for colonic washing and direct topical treatment with vancomycin enemas. This article quoted a 19% mortality rate in these patients compared with a 50% mortality rate in historical controls who underwent total colectomy. The article showed encouraging results; however, the recurrence rate after ileostomy reversal and a longer follow-up period need to be reported in addition to reproducibility verification in other institutes before this procedure can be accepted as a standard of care. Additional studies evaluating this treatment and other novel surgical approaches are also needed. Finally, further investigation is required to evaluate scoring systems that can predict deterioration to better inform decision making with regard to surgery timing and type.
USING THESE GUIDELINES IN CLINICAL PRACTICE
These guidelines represent a very detailed summary of the literature regarding CDAD and surgical timing and type and are meant to inform the decision-making process, not replace clinical judgment. Patients with fulminant CDAD carry a very high mortality rate. The literature available for review thus far supports the course of earlier intervention when deterioration is present and total colectomy as the procedure of choice.
In summary, two important evidence-based recommendations can be provided by using the GRADE methodology (Fig. 7). First, we strongly recommend that adult patients with CDAD undergo early surgery before developing shock and the need for vasopressors. The literature suggests that this may be between 3 days and 5 days after diagnosis in patients who are worsening or not clinically improving. Second, in adult patients with CDAD undergoing surgery, we conditionally recommend total or subtotal colectomy (vs. partial colectomy or other surgery) when the diagnosis of C. difficile colitis is known.
P.F., T.M.D., and E.R.H. conceived the study. P.F. created the PICO questions. P.F., C.G.V., E.R.H., A.P.-E., T.E., H.D., N.D.M., P.B., A.R., and T.M.D. voted regarding the outcomes of interest for these PICO questions. H.D. and N.D.M. evaluated the articles independently for other outcomes, specifically renal failure and respiratory failure. E.J. and P.F. performed the entire literature search, read all of the abstracts, and selected the articles for review. P.F., C.G.V., E.R.H., A.P.-E., T.E., H.D., N.D.M., P.B., A.R., and T.M.D. reviewed and summarized the selected articles. P.F. extracted the data from the selected articles. S.S. and P.F. entered the extracted data into the RevMan and GRADEpro programs and evaluated the results for recommendations. C.G.V. extracted the data and performed the same task independently. P.F. and C.G.V. wrote the manuscript. P.F. and C.G.V. contributed equally to this work and should be noted as co–first authors. S.S. reviewed the manuscript for methodological content and made critical revisions to the final draft. All authors participated in the critical review of all versions of this article.
We thank the EAST and the EAST foundation for the opportunity to write this article, for the specialized training provided to the authors regarding the GRADE method, and for the detail-oriented peer review of multiple versions of this article by the guidelines committee.
The authors declare no conflicts of interest.
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Keywords:© 2014 Lippincott Williams & Wilkins, Inc.
Fulminant CDAD and surgery; surgery and Clostridium-difficile associated disease; Clostridium-difficile outcomes; Clostridium-difficile mortality; guidelines and GRADE methodology