Persistent Elevation of C-Reactive Protein Following Esophagogastric Cancer Resection as a Predictor of Postoperative Surgical Site Infectious Complications. World J Surg. 2011;35:1017-1025. [PMID: 21350898 DOI: 10.1007/s00268-011-1002-1]

Anastomotic Leakage Following Esophagectomy

Anastomotic leaks remain a significant clinical challenge following esophagectomy with foregut reconstruction. Despite an increasing understanding of the multiple contributing factors, advancements in perioperative optimization of modifiable risks, and improvements in surgical, endoscopic, and percutaneous management techniques, leaks remain a source of major morbidity associated with esophageal resection. The surgeon should be well versed in the principles underlying the cause of leaks, and strategies to minimize their occurrence. Appropriately diagnosed and managed, most anastomotic leaks following esophagectomy can be brought to a successful resolution.

Clinical Significance of C-reactive Protein Level After Laparoscopic Gastrectomy: From a Viewpoint of Intra-Abdominal Complications

In this retrospective study, we investigated whether postoperative intra-abdominal infectious complications (IIC) after laparoscopic gastrectomy (LG) is predictable in an early postoperative period using C-reactive protein (CRP). Intra-abdominal infectious complication after gastrectomy is caused mainly by anastomotic leakage or pancreatic injury associated with peripancreatic lymph node (LN) dissection, which may sometimes result in serious outcomes. C-reactive protein is widely used to evaluate the inflammatory status. However, the relationship between the CRP level and postoperative IIC following LG remains unclear. White blood cell count (WBC), CRP counts, and clinical data were available for 229 consecutive patients undergoing LG with lymphadenectomy. We compared CRP and WBC between patients with (Group A) and without (Group B) IIC to check whether these could be used to predict IIC in an early postoperative period. Using the receiver-operating characteristic (ROC) curve, the diagnostic accuracy was evaluated. On postoperative day 1 (POD1), increased CRP levels were associated with IIC (Group A: 9.6 mg/dL, Group B: 6.0 mg/dL; P = 0.000048), while WBC did not differ significantly. On POD3, the difference in CRP between both groups increased (A: 20.2 mg/dL, B: 10.7 mg/dL; P = 1.6 × 10−8). The optimal cutoff value was 14.9 mg/dL on POD3 (sensitivity: 0.79, specificity: 0.78), and the area under the ROC curve was 0.86. Measurements of CRP on POD1 and 3 are helpful for detecting possible IIC after LG, compared with WBC. It is necessary to pay attention to CRP levels for earlier detection of IIC.

Predictive Value of C-Reactive Protein for Major Complications after Major Abdominal Surgery: A Systematic Review and Pooled-Analysis

Background

Early diagnosis and treatment of complications after major abdominal surgery can decrease associated morbidity and mortality. Postoperative CRP levels have shown a strong correlation with complications. Aim of this systematic review and pooled-analysis was to assess postoperative values of CRP as a marker for major complications and construct a prediction model.

Study design

A systematic review was performed for CRP levels as a predictor for complications after major abdominal surgery (MAS). Raw data was obtained from seven studies, including 1427 patients. A logit regression model assessed the probability of major complications as a function of CRP levels on the third postoperative day. Two practical cut-offs are proposed: an optimal cut-off for safe discharge in a fast track protocol and another for early identification of patients with increased risk for major complications.

Results

A prediction model was calculated for major complications as a function of CRP levels on the third postoperative day. Based on the model several cut-offs for CRP are proposed. For instance, a two cut-off system may be applied, consisting of a safe discharge criterion with CRP levels below 75 mg/L, with a negative predictive value of 97.2%. A second cut-off is set at 215 mg/L (probability 20%) and serves as a predictor of complications, indicating additional CT-scan imaging.

Conclusions

The present study provides insight in the interpretation of CRP levels after major abdominal surgery, proposing a prediction model for major complications as a function of CRP on postoperative day 3. Cut-offs for CRP may be implemented for safe early-discharge in a fast-track protocol and, secondly as a threshold for additional examinations, such as CT-scan imaging, even in absence of clinical signs, to confirm or exclude major complications. The prediction model allows for setting a cut-off at the discretion of individual surgeons or surgical departments.

Postoperative C-reactive protein measurement predicts the severity of complications following surgery for colorectal cancer

PURPOSE

Studies have shown that postoperative serum C-reactive protein (CRP) measurement may be useful in predicting the type of complication, infective or otherwise, following surgery for colorectal cancer. It may be that the magnitude of the postoperative CRP is also associated with the severity of the complication. The aim of the present study was to examine the relationship between daily postoperative CRP concentrations and Clavien-Dindo complication grade.

PATIENTS AND METHODS

Data was recorded prospectively for patients undergoing elective, potentially curative, surgery for colorectal cancer in two hospitals between January 2011 and January 2013, n = 241. All patients had daily CRP measurement following surgery for the first four postoperative days. Complications were retrospectively classified by Clavien-Dindo grade.

RESULTS

Of the 241 patients, the majority were male (59%) and were over 65 years old (69%). The majority had colonic (86%) and node negative (65%) disease. One hundred nineteen patients (49%) developed a complication, and 28 (12%) of these were Clavien-Dindo grade 3, 4 or 5. Median and established threshold CRP concentrations on postoperative days 2 (>190 mg/L), 3 (>170 mg/L) and 4 (>125 mg/L) were directly associated with an increase in the Clavien-Dindo grade (all p < 0.001).

CONCLUSION

There was a direct association between exceeding established postoperative day 2, 3 and 4 CRP thresholds and the severity of complications defined by the Clavien-Dindo grade.

Routine clinical markers of the magnitude of the systemic inflammatory response after elective operation: a systematic review

BACKGROUND

Operative injury to the body from all procedures causes a stereotypical cascade of neuroendocrine, cytokine, myeloid, and acute phase responses. This response has been examined commonly by the use of cortisol, interleukin-6 (IL-6), white cell count, and C-reactive protein (CRP). We aimed to determine which markers of the systemic inflammatory response were useful in determining the magnitude of injury after elective operations.

METHODS

A systematic review of the literature was performed using surgery, endocrine response, systemic inflammatory response, cortisol, IL-6, white cell count, and CRP. For each analyte the studies were grouped according to whether the operative injury was considered to be minor, moderate, or major and then by the operative procedure.

RESULTS

A total of 164 studies were included involving 14,362 patients. The IL-6 and CRP responses clearly were associated with the magnitude of operative injury and the invasiveness of the operative procedure. For example, the peak CRP response increased from 52 mg/L with cholecystectomy to 123 mg/L with colorectal cancer resection, 145 mg/L with hip replacement, 163 mg/L after abdominal aortic aneurysm repair, and 189 mg/L after open cardiac surgery. There also appeared to be a difference between minimally invasive/laparoscopic and open procedures such as cholecystectomy (27 vs 80 mg/L), colorectal cancer resection (97 vs 133 mg/L), and aortic aneurysm repair (132 vs 180 mg/L).

CONCLUSION

Peak IL-6 and CRP concentrations consistently were associated with the magnitude of operative injury and operative procedure. These markers may be useful in the objective assessment of which components of Enhanced Recovery after Surgery are likely to improve patient outcome and to assess the possible impact of operative injury on immune function.

Meta-analysis of the predictive value of C-reactive protein for infectious complications in abdominal surgery

BACKGROUND

The aim of this analysis was to assess the predictive value of C-reactive protein (CRP) for the early detection of postoperative infectious complications after a variety of abdominal operations.

METHODS

A meta-analysis of seven cohort studies from a single institution was performed. Laparoscopic gastric bypass and colectomies, as well as open resections of cancer of the colon, rectum, pancreas, stomach and oesophagus, were included. The predictive value of CRP was assessed by the area under the curve (AUC) of the receiver operating characteristic (ROC) curve.

RESULTS

Of 1986 patients, 577 (29·1 (95 per cent c.i. 27·1 to 31·3) per cent) had at least one postoperative infectious complication. Patients undergoing laparoscopic gastric bypass (383 patients) or colectomy (285), and those having open gastric (97) or colorectal (934) resections were combined in a meta-analysis. Patients who had resection for cancer of the oesophagus (41) or pancreas (246) were analysed separately owing to heterogeneity. CRP levels 4 days after surgery had the highest diagnostic accuracy (AUC 0·76, 95 per cent c.i. 0·73 to 0·78). Sensitivity and specificity were 68·5 (60·6 to 75·5) and 71·6 (66·6 to 76·0) per cent respectively. Positive and negative predictive values were 50·4 (46·0 to 54·8) and 84·3 (80·8 to 87·3) per cent. The threshold CRP varied according to the procedure performed.

CONCLUSION

The negative predictive value of serum CRP concentration on day 4 after surgery facilitates reliable exclusion of postoperative infectious complications.

Diagnostic value of C-reactive protein to rule out infectious complications after major abdominal surgery: a systematic review and meta-analysis

PURPOSE

Infectious complications occur frequently after major abdominal surgery and have a major influence on patient outcome and hospital costs. A marker that can rule out postoperative infectious complications (PICs) could aid patient selection for safe and early hospital discharge. C-reactive protein (CRP) is a widely available, fast, and cheap marker that might be of value in detecting PIC. Present meta-analysis evaluates the diagnostic value of CRP to rule out PIC following major abdominal surgery, aiding patient selection for early discharge.

METHODS

A systematic literature search of Medline, PubMed, and Cochrane was performed identifying all prospective studies evaluating the diagnostic value of CRP after abdominal surgery. Meta-analysis was performed according to the PRISMA statement.

RESULTS

Twenty-two studies were included for qualitative analysis of which 16 studies were eligible for meta-analysis, representing 2215 patients. Most studies analyzed the value of CRP in colorectal surgery (eight studies). The pooled negative predictive value (NPV) improved each day after surgery up to 90% at postoperative day (POD) 3 for a pooled CRP cutoff of 159 mg/L (range 92-200). Maximum predictive values for PICs were reached on POD 5 for a pooled CRP cutoff of 114 mg/L (range 48-150): a pooled sensitivity of 86% (95% confidence interval (CI) 79-91%), specificity of 86% (95% CI 75-92%), and a positive predictive value of 64% (95% CI 49-77%). The pooled sensitivity and specificity were significantly higher on POD 5 than on other PODs (p < 0.001).

CONCLUSION

Infectious complications after major abdominal surgery are very unlikely in patients with a CRP below 159 mg/L on POD 3. This can aid patient selection for safe and early hospital discharge and prevent overuse of imaging.

Rising C-reactive protein and procalcitonin levels precede early complications after esophagectomy

BACKGROUND

Elective esophagectomy with gastric tube reconstruction carries a high risk for complications. Early and accurate diagnosis could improve patient management. Increased C-reactive protein (CRP) levels may be associated with any, surgical or infectious, complication and procalcitonin (PCT) specifically with infectious complications.

METHODS

We measured CRP and PCT on post-operative days 0, 1, 2, and 3 in 45 consecutive patients. Complications were recorded up to 10 days post-esophagectomy.

RESULTS

Twenty-eight patients developed a post-operative complication (5 surgical, 14 infectious, 9 combined surgical/infectious, including anastomotic leakage), presenting on day 3 or later. Elevated days 2 and 3 and a rise in CRP preceded the diagnosis of general or combined surgical/infectious complications (minimum area under the receiver operating characteristics curve (AUROC) 0.75, P = 0.006). Elevated day 3 PCT preceded combined complications (AUROC 0.86, P < 0.001). High day 1 and 3 PCT levels preceded anastomotic leakage (minimum AUROC 0.76, P = 0.005), as did the day 3 CRP levels and their increases (minimum AUROC 0.78, P = 0.002).

CONCLUSIONS

This small study suggests that high or increasing CRP levels may precede the clinical diagnosis of general or surgical/infectious complications after esophagectomy. Elevated PCT levels may more specifically and timely precede combined surgical/infectious complications mainly associated with anastomotic leakage.

The preoperative serum C-reactive protein level is a useful predictor of surgical site infections in patients undergoing appendectomy

PURPOSE

Although surgical site infections (SSI) are a major postoperative complication of appendectomy, few studies have focused on the risk factors for SSI. In this study, we investigated the risk factors for SSI in patients who had undergone appendectomy.

METHODS

Three hundred patients who had undergone open appendectomy were enrolled. The patients were divided into two groups based on the presence or absence of SSI. A statistical analysis was performed to assess the clinical features associated with SSI after appendectomy.

RESULTS

A multivariate analysis using the results of univariate analyses revealed that the serum C-reactive protein (CRP) level (≤ 65/> 65, mg/l), length of the operation (≤ 80/> 80, min) and pathology (catarrhal, phlegmonous/gangrenous) were associated with SSI. Among these three clinical features, only the CRP level was found to predict the risk of SSI prior to appendectomy (odds ratio 3.797; 95 % confidence intervals 1.305-11.04; P = 0.014).

CONCLUSION

Preoperative elevation of the serum CRP level (> 65 mg/l) is a valuable predictor of SSI in patients undergoing appendectomy.

A new clinical scoring system to define pneumonia following esophagectomy for cancer

BACKGROUND

Pneumonia is a frequently observed complication following esophagectomy. The lack of a uniform definition of pneumonia leads to large variations of pneumonia rates in literature. This study was designed to develop a scoring system for diagnosing pneumonia following esophagectomy at the hospital ward.

METHODS

In a prospective cohort study of esophagectomy patients, known risk factors for pneumonia, temperature, leukocyte count, pulmonary radiography and sputum culture added were evaluated. Primary outcome was defined as the decision to treat suspected pneumonia. Multivariate Cox regression analysis with backward selection was used to identify predictors of pneumonia treatment.

RESULTS

The majority of postoperative pneumonia treatments (88.2%) occurred at the hospital ward, where treatment was observed in 67 (36.2%) of 185 patients. Independent diagnostic determinants for pneumonia treatment were temperature (hazard ratio (HR) = 1.283, p = 0.073), leukocyte count (HR = 1.040, p = 0.078) and pulmonary radiography (HR >11.0, p = 0.000). Sputum culture did not influence the decision to treat pneumonia. These findings were used to develop a scoring system which includes temperature, leukocyte count and pulmonary radiography.

CONCLUSION

The decision to treat pneumonia is based on temperature, leukocyte count and pulmonary radiography findings. The proposed clinical scoring system for pneumonia following esophagectomy at the hospital ward has the potential to aid clinical practice and improve comparability of future research in esophageal cancer surgery.

Diagnostic markers of postoperative morbidity after laparoscopic Roux-en-Y gastric bypass for obesity

PURPOSE

The main objective of this study was to detect subacute complications that can arise from laparoscopic Roux-en-Y gastric bypass and take a rational approach to manage these complications.

METHODS

A prospective observational study was performed from November 2010 to December 2012. All patients undergoing gastric bypass surgery for morbid obesity were included in this study. Patients with complications before day 5 were excluded from the study. Clinical and laboratory data (C-reactive protein, leukocyte count) at postoperative day 5, 30-day morbidity, were recorded. The diagnostic value of C-reactive protein (CRP) and leukocytes were determined by the area under the curve (AUC) of the receiver operating characteristic (ROC) curve.

RESULTS

One hundred and twenty-six patients were included. The overall incidence of 30-day morbidity was 8.7 %, and anastomotic leakage rate was 3.2 %. C-reactive protein at postoperative day 5 was a good predictor of complications (AUC was 0.862 (95 % CI [0.76; 0.96]; p < 0.001) and anastomotic leakage (AUC was 0.863 (95 % CI [0.66; 1]; p = 0.014). A CRP cutoff level of 136 mg/l at postoperative day 5 yielded a specificity of 95.5 % and a sensitivity of 57.1 % for the detection of postoperative complications. The negative predictive value was 94.6 %. A CRP level of 136 mg/l at day 5 was significantly associated with postoperative morbidity.

CONCLUSIONS

C-reactive protein dosage at postoperative day 5 is a relevant predictor of postoperative complications permitting to select patients at risk. Radiological examination and close monitoring could be restricted to patients with CRP level exceeding 136 mg/l.

Syndromic surveillance of surgical site infections--a case study in coronary artery bypass graft patients

OBJECTIVE

There is a wealth of data routinely collected and stored by healthcare facilities, which are not consistently exploited for surveillance of healthcare associated infections (HCAI). Syndromic surveillance has not yet been widely applied to HCAI. This study aimed to create syndromic surveillance for surgical site infections (SSI) following coronary artery bypass graft (CABG) procedures.

METHODS

A cohort of CABG patients from Imperial College Healthcare NHS Trust was investigated. Data from the local Patient Administration System, Laboratory Information Management System, radiology department, cardiac registry and Health Protection Agency SSI surveillance were linked. This data was explored for biological markers and proxies of infection, which were used to develop syndromic surveillance algorithms; sensitivity analysis was used to determine the best algorithms.

RESULTS

303 patients were included, with a SSI incidence of 6.6%. Wound culture requests, raised platelet and fibrinogen levels were all found to be good indicators of SSI. Two algorithms were generated, one to detect all SSI (sensitivity: 90%; specificity: 93.8%) and one to detect organ space infections specifically (sensitivity: 100%; specificity: 98.5%).

CONCLUSION

Data which is routinely collected and stored in healthcare facilities can be used for syndromic surveillance of SSI, allowing for an efficient surveillance system without the need for resource intensive data collection.

Comparison of C-reactive protein and procalcitonin as predictors of postoperative infectious complications after elective colorectal surgery

Aim

To assess diagnostic value of perioperative procalcitonin (PCT) levels compared to C-reactive protein (CRP) levels in early detection of infectious complications following colorectal surgery.

Methods

This prospective observational study included 79 patients undergoing elective colorectal surgery. White blood cell count, CRP, and PCT were measured preoperatively and on postoperative days (POD) 1, 2, 3, 5, and patients were followed for postoperative complications. Diagnostic accuracy of CRP and PCT values on each day was analyzed by the receiver operating characteristics (ROC) curve, with infectious complications as an outcome measure. ROC curves with the largest area under the curve for each inflammatory marker were compared in order to define the marker with higher diagnostic accuracy.

Results

Twenty nine patients (36.7%) developed infectious complications. CRP and PCT concentrations increased in the early postoperative period, with a significant difference between patients with and without complications at all measured postoperative times. ROC curve analysis showed that CRP concentrations on POD 3 and PCT concentrations on POD 2 had similar predictive values for the development of infectious complications (area under the curve, 0.746 and 0.750, respectively) with the best cut-off values of 99.0 mg/L for CRP and 1.34 µg/L for PCT. Diagnostic accuracy of CRP and PCT was highest on POD 5, however the cut-off values were not considered clinically useful.

Conclusion

Serial postoperative PCT measurements do not offer an advantage over CRP measurements for prediction of infectious complications following colorectal surgery.

Routine endoscopy to detect anastomotic leakage after esophagectomy

BACKGROUND

This study evaluated the safety and efficacy of endoscopy in diagnosing anastomotic leaks after esophagectomy.

METHODS

One hundred consecutive postesophagectomy patients, all having reconstruction using the stomach, underwent endoscopy in the first week after operation. The anastomosis and gastric mucosa were examined for evidence of ischemia, necrosis, and leak.

RESULTS

There was no evidence that the procedure caused damage to the anastomosis or gastric conduit. The results of 79 examinations were normal, 15 showed gastric ischemia, 2 showed a leak, and 4 showed ischemia plus leakage. The 15 patients with ischemia alone were monitored with a repeat endoscopy after a further week: a late leak developed in 1 patient that was diagnosed at the second examination. No further leaks developed subsequently, making endoscopy 100% accurate in the diagnosis of leaks after esophagectomy.

CONCLUSIONS

Esophagoscopy within 1 week of esophagectomy is a safe and highly accurate method of diagnosing leaks and provides unique information on the condition of the stomach. We believe it allows a more targeted approach to patient care in the context of anastomotic healing and in the treatment of leaks.

C-reactive protein 2 days after laparoscopic gastric bypass surgery reliably indicates leaks and moderately predicts morbidity

BACKGROUND

The aim of the present study was to evaluate whether serum C-reactive protein (CRP) is a useful predictor of early post-operative complications, particularly of intestinal leaks after laparoscopic Roux-en-Y gastric bypass (LRYGB) surgery.

METHODS

The present study was a retrospective analysis of a prospectively maintained database with 809 patients who underwent LRYGB from 2002 until 2011. For 410 of these patients, at least one CRP measurement within the first seven post-operative days was available. The diagnostic value was determined by the area under the curve (AUC) of the receiver operating characteristic (ROC) curve.

RESULTS

Forty-nine of 410 patients (12.0 %; 95 % confidence intervals [95 % CI], 9.2-15.5 %) developed surgery-related complications. Leaks occurred in 17 patients (4.1 %; 95 % CI, 2.6-6.5 %) at a median of 5 days after surgery. CRP levels 2 days after surgery showed the highest diagnostic value for post-operative complications (AUC, 0.74; 95 % CI, 0.60-0.89). Sensitivity was 0.53 (95 % CI, 0.31-0.74) and specificity was 0.91 (95 % CI, 0.79-0.96) on day 2 (cutoff level, 229 mg/l). The sensitivity for intestinal leaks was 1.00 (95 % CI, 0.51-1.00).

CONCLUSION

CRP on post-operative day 2 is a valuable predictor of post-operative complications, in particular intestinal leaks. Radiological imaging studies for intestinal leaks could be restricted to patients with CRP values exceeding 229 mg/l.

Risk assessment using a novel score to predict anastomotic leak and major complications after oesophageal resection

BACKGROUND

Oesophagectomy is associated with significant morbidity and mortality. A simple score to define a patient's risk of developing major complications would be beneficial.

METHODS

Patients who underwent upper gastrointestinal resections with an oesophageal anastomosis between 2005 and 2010 were reviewed and formed the development dataset with resections performed in 2011 forming a prospective validation dataset. The association between post-operative C-reactive protein (CRP), white cell count (WCC) and albumin levels with anastomotic leak (AL) or major complication including death using the Clavien-Dindo (CD) classification were analysed by receiver operating characteristic curves. After multivariate analysis, from the development dataset, these factors were combined to create a novel score which was subsequently tested on the validation dataset.

RESULTS

Two hundred fifty-eight patients were assessed to develop the score. Sixty-three patients (25%) developed a major complication, and there were seven (2.7%) in-patient deaths. Twenty-six (10%) patients were diagnosed with AL at median post-operative day 7 (range: 5-15). CRP (p = 0.002), WCC (p < 0.0001) and albumin (p = 0.001) were predictors of AL. Combining these markers improved prediction of AL (NUn score > 10: sensitivity 95%, specificity 49%, diagnostic accuracy 0.801 (95% confidence interval: 0.692-0.909, p < 0.0001)). The validation dataset confirmed these findings (NUn score > 10: sensitivity 100%, specificity 57%, diagnostic accuracy 0.879 (95% CI 0.763-0.994, p = 0.014)) and a major complication or death (NUn > 10: sensitivity 89%, specificity 63%, diagnostic accuracy 0.856 (95% CI 0.709-1, p = 0.001)).

CONCLUSIONS

Blood-borne markers of the systemic inflammatory response are predictors of AL and major complications after oesophageal resection. When combined they may categorise a patient's risk of developing a serious complication with higher sensitivity and specificity.