Risk factors for surgical site infection in Japanese patients with ulcerative colitis: a multicenter prospective study

Oral antimicrobial prophylaxis was associated with preventing surgical site infection following 2-stage restorative proctocolectomy in patients with ulcerative colitis

BACKGROUND

Surgical site infection (SSI) is a critical issue in colorectal surgery because it decreases postoperative patient quality of life. The rate of SSI in patients with ulcerative colitis (UC) receiving immunosuppressive therapy is particularly high, suggesting that the SSI rate may increase with the introduction of biologic agents.

METHODS

UC patients who underwent two-stage restorative proctocolectomy at our institution between April 2012 and December 2023 were included in this study. Clinical characteristics were analyzed and compared between an SSI group and a non-SSI group; possible risk factors for SSIs were also analyzed. Additionally, the following anti-SSI measures adopted at our hospital were included as explanatory variables: laparoscopic surgery, oral antibiotic prophylaxis and change of surgical instruments before wound closure.

RESULTS

In total, 501 UC surgical patients were included. The incidence of overall SSIs was 45/501 (8.9%). The rates of incisional SSIs and organ/space SSIs were 26/501 (5.1%) and 30/501 (5.9%), respectively. Oral antibiotic prophylaxis was identified as a risk factor for overall SSIs (odds ratio: 0.45, 95% CI 0.20-0.99, p = 0.02), incisional SSIs (odds ratio: 0.34, 95% CI 0.11-1.03, p = 0.03) and organ/space SSIs (odds ratio: 0.35, 95% CI 0.12-0.98, p = 0.04). The use of biologic and immunosuppressive agents was not associated with any SSIs.

CONCLUSIONS

Nonadministration of oral antibiotic prophylaxis was identified as a risk factor for SSIs. Oral antibiotic prophylaxis before restorative proctocolectomy may improve the postoperative quality of life of UC patients by preventing SSIs.

Clinical evaluation of platelet-to-albumin ratio as a predictor of surgical site infection in pediatric patients with ulcerative colitis

PURPOSE

This study explored the predictive factors for surgical site infection (SSI) in a pediatric ulcerative colitis (UC) population.

METHODS

Data from 35 patients with UC who underwent surgery before 15 years at Mie University Hospital between January 2000 and December 2022 were retrospectively reviewed. Potential preoperative and intraoperative predictors of SSI, including various demographic and clinical variables, were analyzed using the Mann-Whitney U test and logistic regression analysis. The optimal cutoff value for the variables was determined by examining the receiver operating characteristic curve.

RESULTS

Of the 35 patients, 8 (22.9%) experienced SSI. The platelet-to-albumin ratio (PAR) is a more accurate predictor of SSI occurrence than the serum albumin level, platelet count, or C-reactive protein level. The sensitivity and specificity of PAR were 75.0% and 77.8%, respectively, with an area under the curve (AUC) of 0.782 (p = 0.018). A multivariable analysis revealed that preoperative PAR was the only significant independent predictor (cutoff value: 115,000, p = 0.047) when the optimal cutoff value was applied rather than the median value.

CONCLUSIONS

This study demonstrated the value of the preoperative PAR in the management of pediatric patients with UC. Assessing the patient's PAR before surgery allows proactive treatment to reduce the risk of SSI.

Preoperative risk factors of incisional surgical site infection in severe or intractable ulcerative colitis

PURPOSE

The present study explored preoperative risk factors (predictors) of incisional surgical site infection (I-SSI) in severe or intractable ulcerative colitis (UC).

METHODS

This was a retrospective study of 230 consecutive patients who underwent primary surgery for UC. Patients whose surgical indications were UC with cancer or dysplasia were excluded. SSI was defined as an infection according to the Centers for Disease Control and Prevention Guidelines. Preoperative variables were examined by univariate, receiver operating characteristic curve, and multivariate analyses.

RESULTS

We analyzed 208 patients in this study. In a multivariate logistic analysis, C-reactive protein (CRP) ≥ 1.7 mg/dl [odds ratio (OR) 5.35; 95% confidence interval (CI) 1.50-19.06; p = 0.01), albumin ≤ 2.4 g/dl (OR 5.77; 95% CI 1.41-23.57; p = 0.02), and preoperative blood transfusion (OR 3.21; 95% CI 1.04-9.96; p = 0.04) were predictors of I-SSI. Patients with all predictors had a more than 50% incidence of I-SSI, a higher incidence of all severe complications (13.6% vs. 3.2%; p = 0.02), and a longer postoperative hospital stay (19.5 vs. 17.0 days, p = 0.04) than the other patients.

CONCLUSIONS

CRP ≥ 1.7 mg/dl, albumin ≤ 2.4 g/dl, and transfusion are predictors of I-SSI in severe or intractable UC. Clinician should carefully evaluate the surgical options before these predictors appear.

Preoperative Neutrophil-to-Lymphocyte Ratio Is Correlated with Severe Postoperative Complications After Emergency Surgery for Ulcerative Colitis

Introduction

The incidence of postoperative severe complications is reported to be high in patients undergoing emergency surgery for severe ulcerative colitis (UC). It has also been reported that the preoperative inflammatory status is associated with the frequency of postoperative complications. The neutrophil-to-lymphocyte ratio (NLR) is a simple and useful parameter for determining the inflammatory status.

Methods

In the present study, we retrospectively investigated the correlation between the NLR and the incidence of severe postoperative complications in patients undergoing emergency surgery for severe UC. A total of 105 UC patients who underwent emergency or semi-emergency surgery were enrolled. Various clinical factors and NLR values were evaluated to identify the risk factors for severe complications. Postoperative complications were stratified by their severity according to the Clavien-Dindo Classification (CD). A postoperative complication of CD IIIb or higher was defined as severe postoperative complications. The incidence of severe complications was 16.2%.

Results

A multivariate analysis revealed the ASA score, toxic megacolon, and NLR to be independent risk factors for severe postoperative complications.

Conclusions

The results of this retrospective study suggest that the NLR is an independent risk factor for severe postoperative complications in patients undergoing emergency surgery for UC.

Risk factors for surgical site infection after colorectal resection: a prospective single centre study. An analysis on 287 consecutive elective and urgent procedures within an institutional quality improvement project

AIM

To determine the incidence and to investigate risk factors for surgical site infections (SSIs) in a cohort of patients undergoing colorectal surgery.

MATERIAL & METHODS

Data from all consecutive patients operated at our department in an elective or in an urgent setting over a 4-month period were prospectively collected and analysed. The updated Centres for Disease Control and Prevention guidelines were used to define and to score SSIs during weekly meetings. Multivariate analysis was performed considering a list of 20 potential perioperative risk factors.

RESULTS

A total of 287 patients (mean age 56.9 ± 16.8 years, 51.2% male) were included. Thirty-five patients (12.2%) developed SSI. Independent risk factors for SSI were BMI <20 kg/m² (OR 3.70; p = .022), cancer (OR 0.33; p = .046), respiratory comorbidity (OR 3.15; p = .035), presence of a preoperative stoma (OR 3.74; p = .003), and operative time ≥3 hours (OR 2.93; p = .014).

CONCLUSION

Identified incidence and risk factors for the development of SSI after colorectal surgery were consistent with those already reported in the literature. The possibility to develop a validated prediction model for SSIs warrants further investigation, in order to target specific preventive measures on high-risk population.

Risk of Postoperative Infectious Complications From Medical Therapies in Inflammatory Bowel Disease: A Systematic Review and Meta-Analysis

OBJECTIVE

To assess the impact of inflammatory bowel disease (IBD) medications on postoperative infection risk within 30 days of surgery.

METHODS

We searched multiple electronic databases and reference lists of articles dating up to August 2018 for prospective and retrospective studies comparing postoperative infection risk in patients treated with an IBD medication perioperatively with the risk in patients who were not taking that medication. Outcomes were overall infectious complications and intra-abdominal infections within 30 days of surgery.

RESULTS

Sixty-three studies were included. Overall infectious complications were increased in patients who received anti-tumor necrosis factor (TNF) agents (odds ratio [OR] 1.26; 95% confidence interval [CI], 1.07-1.50) and corticosteroids (OR 1.34; 95% CI, 1.25-1.44) and decreased in those who received 5-aminosalicylic acid (OR 0.63; 95% CI, 0.46-0.87). No difference was observed in those treated with immunomodulators (OR 1.08; 95% CI, 0.94-1.25) or anti-integrin agents (OR 1.06; 95% CI, 0.67-1.69). Both corticosteroids and anti-TNF agents were associated with increased intra-abdominal infection risk (OR 1.63; 95% CI, 1.33-2.00 and OR 1.46; 95% CI, 1.08-1.97, respectively), whereas no impact was observed with 5-aminosalicylates, immunomodulators, or anti-integrin therapy. Twenty-two studies had low risk of bias while the remaining studies had very high risk.

CONCLUSIONS

Corticosteroids and anti-TNF agents were associated with increased overall postoperative infection risk as well as intra-abdominal infection in IBD patients, whereas no increased risk was observed for immunomodulators or anti-integrin therapy. Although these results may result from residual confounding rather than from a true biological effect, prospective studies that control for potential confounding factors are required to generate higher-quality evidence.

Risk factors for surgical site infections using a data-driven approach

Objective

The objective of this study was to identify risk factors for surgical site infection from digestive, thoracic and orthopaedic system surgeries using clinical and data-driven cut-off values. A second objective was to compare the identified risk factors in this study to risk factors identified in literature.

Summary background data

Retrospective data of 3 250 surgical procedures performed in large tertiary care hospital in The Netherlands during January 2013 to June 2014 were used.

Methods

Potential risk factors were identified using a literature scan and univariate analysis. A multivariate forward-step logistic regression model was used to identify risk factors. Standard medical cut-off values were compared with cut-offs determined from the data.

Results

For digestive, orthopaedic and thoracic system surgical procedures, the risk factors identified were preoperative temperature of ≥38°C and antibiotics used at the time of surgery. C-reactive protein and the duration of the surgery were identified as a risk factors for digestive surgical procedures. Being an adult (age ≥18) was identified as a protective effect for thoracic surgical procedures. Data-driven cut-off values were identified for temperature, age and CRP which can explain the SSI outcome up to 19.5% better than generic cut-off values.

Conclusions

This study identified risk factors for digestive, orthopaedic and thoracic system surgical procedures and illustrated how data-driven cut-offs can add value in the process. Future studies should investigate if data-driven cut-offs can add value to explain the outcome being modelled and not solely rely on standard medical cut-off values to identify risk factors.

Risk of postoperative infectious complications from medical therapies in inflammatory bowel disease

BACKGROUND

Medications used to treat inflammatory bowel disease (IBD) have significantly improved patient outcomes and delayed time to surgery. However, some of these therapies are recognized to increase the general risk of infection and have an unclear impact on postoperative infection risk.

OBJECTIVES

To assess the impact of perioperative IBD medications on the risk of postoperative infections within 30 days of surgery.

SEARCH METHODS

We searched the Cochrane IBD Group's Specialized Register (29 October 2019), MEDLINE (January 1966 to October 2019), Embase (January 1985 to October 2019), the Cochrane Library, ClinicalTrials.gov and the WHO International Clinical Trials Registry Platform from inception up to October 2019, and reference lists of articles.

SELECTION CRITERIA

Randomized controlled trials, quasi-randomized controlled trials, non-randomized controlled trials, prospective cohort studies, retrospective cohort studies, case-control studies and cross-sectional studies comparing participants treated with an IBD medication preoperatively or within 30 days postoperatively to those who were not taking that medication (either another active medication, placebo, or no treatment). We included published study reports and abstracts.

DATA COLLECTION AND ANALYSIS

Two review authors independently screened titles and abstracts and extracted data. The primary outcome was postoperative infection within 30 days of surgery. Secondary outcomes included incisional infections and wound dehiscence, intra-abdominal infectious complications and extra-abdominal infections. Three review authors assessed risks of bias using the Newcastle-Ottawa Scale. We contacted authors for additional information when data were missing. For the primary and secondary outcomes, we calculated odds ratios (ORs) and corresponding 95% confidence intervals (95% CIs) using the generic inverse variance method. When applicable, we analyzed adjusted and unadjusted data separately. We evaluated the certainty of the evidence using GRADE.

MAIN RESULTS

We included 68 observational cohort studies (total number of participants unknown because some studies did not report the number of participants). Of these, 48 studies reported including participants with Crohn's disease, 36 reported including participants with ulcerative colitis and five reported including participants with indeterminate colitis. All 42 studies that reported urgency of surgery included elective surgeries, with 31 (74%) of those also including emergency surgeries. Twenty-four studies had low risk of bias while the rest had very high risk. Based on pooling of adjusted data, we calculated ORs for postoperative total infection rates in participants who received corticosteroids (OR 1.70, 95% CI 1.38 to 2.09; low-certainty evidence), immunomodulators (OR 1.29, 95% CI 0.95 to 1.76; low-certainty evidence), anti-TNF agents (OR 1.60, 95% CI 1.20 to 2.13; very low-certainty evidence) and anti-integrin agents (OR 1.04, 95% CI 0.79 to 1.36; low-certainty evidence). We pooled unadjusted data to assess postoperative total infection rates for the use of aminosalicylates (5-ASA) (OR 0.76, 95% CI 0.51 to 1.14; very low-certainty evidence). One secondary outcome examined was wound-related complications in participants using: corticosteroids (OR 1.41, 95% CI 0.72 to 2.74; very low-certainty evidence), immunomodulators (OR 1.35, 95% CI 0.96 to 1.89; very low-certainty evidence), anti-TNF agents (OR 1.18, 95% CI 0.83 to 1.68; very low-certainty evidence) and anti-integrin agents (OR 1.64, 95% CI 0.77 to 3.50; very low-certainty evidence) compared to controls. Another secondary outcome examined the odds of postoperative intra-abdominal infections in participants using: corticosteroids (OR 1.53, 95% CI 1.28 to 1.84; very low-certainty evidence), 5-ASA (OR 0.77, 95% CI 0.45 to 1.33; very low-certainty evidence), immunomodulators (OR 0.86, 95% CI 0.66 to 1.12; very low-certainty evidence), anti-TNF agents (OR 1.38, 95% CI 1.04 to 1.82; very low-certainty evidence) and anti-integrin agents (OR 0.40, 95% CI 0.14 to 1.20; very low-certainty evidence) compared to controls. Lastly we checked the odds for extra-abdominal infections in participants using: corticosteroids (OR 1.23, 95% CI 0.97 to 1.55; very low-certainty evidence), immunomodulators (OR 1.17, 95% CI 0.80 to 1.71; very low-certainty evidence), anti-TNF agents (OR 1.34, 95% CI 0.96 to 1.87; very low-certainty evidence) and anti-integrin agents (OR 1.15, 95% CI 0.43 to 3.08; very low-certainty evidence) compared to controls.

AUTHORS' CONCLUSIONS

The evidence for corticosteroids, 5-ASA, immunomodulators, anti-TNF medications and anti-integrin medications was of low or very low certainty. The impact of these medications on postoperative infectious complications is uncertain and we can draw no firm conclusions about their safety in the perioperative period. Decisions on preoperative IBD medications should be tailored to each person's unique circumstances. Future studies should focus on controlling for potential confounding factors to generate higher-quality evidence.

The prognostic nutritional index for postoperative infectious complication in patients with ulcerative colitis undergoing proctectomy with ileal pouch-anal anastomosis following subtotal colectomy

Objectives: Restorative proctocolectomy and ileal pouch-anal anastomosis is frequently performed in patients with ulcerative colitis and factors suspected of increasing the risk of postoperative infectious complications. Using a three-stage approach may result in improvement in overall outcomes, because this leads to improvement in nutritional status and reduction of immunosuppressive doses. However, the influence of preoperative nutritional status on postoperative infectious complications after this procedure has not been examined. The aim of this study was to clarify the potential associations between nutritional status and postoperative infectious complications in patients with ulcerative colitis undergoing proctectomy with ileal pouch-anal anastomosis. Methods: The records of 110 patients who had undergone proctectomy with ileal pouch-anal anastomosis from January 2000 to March 2018 in Mie University and met the eligibility criteria were reviewed and possible associations between postoperative infectious complications and clinical factors were assessed. Results: Of the remaining 110 patients, 18 (16.4%) had developed postoperative infectious complications. Multivariate analysis revealed that operative bleeding ≥270 g and prognostic nutritional index <47 were significant predictors of postoperative infectious complications (P = 0.033, 0.0076, respectively). Various variables associated with immunosuppressives before ileal pouch-anal anastomosis were not associated with postoperative infectious complications. Conclusions: Our findings suggest that immunosuppressives have no association with postoperative infectious complications, whereas a poor prognostic nutritional index may be a significant predictor of postoperative infectious complications in patients with ulcerative colitis undergoing proctectomy with ileal pouch-anal anastomosis.

Risk factors for postoperative infection after gastrointestinal surgery among adult patients with inflammatory bowel disease: Findings from a large observational US cohort study

Background and Aim

Postoperative infection (POI) is a major source of morbidity and prolongation of hospitalization in inflammatory bowel disease (IBD) patients. This large observational study was conducted to further describe risk factors and to quantify the proportion of POIs that are preventable.

Methods

We conducted a retrospective cohort analysis of the Optum US health insurance claims database. The study population included adults with ulcerative colitis (UC) or Crohn's disease (CD) who underwent lower gastrointestinal (GI) surgery of small intestine, colon, rectum, or anus during September 2014 to September 2016. Multiple logistic regression was used to identify and quantify risk factors and determine the proportion of infections that are preventable.

Results

A total of 3360 adult IBD patients with lower GI surgery were included in the study. Their mean age was 51 years, 52.5% were women, and 59.5% had CD. The 30‐day POI incidence was 15.1% (95% confidence interval: 14.0–16.4%). We identified the following nonmodifiable or procedural risk factors: history of POI, open procedure, red blood cell transfusion within 6 months, preoperative hospital stay of at least 4 days, lower GI ostomy surgery, lower GI resection surgery, and a history of chronic obstructive pulmonary disease. Modifiable risk factors included corticosteroid use and anemia prior to surgery, but few infections were attributable to these modifiable factors.

Conclusions

This large, observational, real‐world evidence study from the US found that the majority of the observed risk factors were nonmodifiable or procedure‐related. Corticosteroid use and anemia before surgery were identified as modifiable risk factors.

Incidence and risk factors for incisional surgical site infection in patients with Crohn's disease undergoing bowel resection

Background

Patients with Crohn's disease (CD) are often reported to be at a high risk for incisional surgical site infection (SSI). The aim of this study was to identify the risk factors associated with post-operative incisional SSI in CD patients after bowel resection.

Method

CD patients undergoing bowel resection between 2007 and 2015 were enrolled. Demographic and clinical features related to post-operative incisional SSI were analysed using both univariate and multivariate logistical analyses.

Results

Of all eligible patients (n = 159), 123 (77.4%) were male, with a mean age at surgery of 33.4 ± 11.8 years. A total of 35 (22.0%) CD patients developed post-operative incisional SSI. Post-operative incisional SSI was more likely to happen in patients who had penetrating type of disease (P = 0.018), underwent bowel resection for the indication of chronic fistula (P = 0.005) and had an intra-operative finding of fistula (P = 0.001). A greater proportion of patients with post-operative incisional SSI were found to have anemia (P = 0.019) but elevated levels of white blood cells (P = 0.027), neutrophils (P = 0.006) as well as an elevated percentage of neutrophils (P = 0.005). Multivariate logistic regression analysis showed that anemia (odds ratio [OR]: 3.31, 95% confidence interval [CI]: 1.05-10.46, P = 0.041), an elevated percentage of neutrophils (OR: 2.85, 95% CI: 1.23-6.59, P = 0.014) and an intra-operative finding of fistula (OR: 3.76, 95% CI: 1.53-9.21, P = 0.004) were significantly associated with the risk for post-operative incisional SSI.

Conclusions

Anemia, elevated percentage of neutrophils and intra-operative finding of fistula are predictors for the development of post-operative incisional SSI in CD patients undergoing bowel resection. Favorable pre-operative nutrition status and low inflammatory status may lessen the incidence of post-operative incisional SSI.

Validation and optimization of the Systemic Inflammation-Based modified Glasgow Prognostic Score in predicting postoperative outcome of inflammatory bowel disease: preliminary data

Systemic Inflammation-Based modified Glasgow Prognostic Score (mGPS) was developed as an objective tool to grade state of inflammation. However, the association between mGPS and postoperative complications for inflammatory bowel disease (IBD) patients was still unknown. In our study, 270 IBD patients [Crohn’s disease (CD), n = 186; Ulcerative colitis (UC), n = 84] from January 2013 and January 2016 who underwent elective bowel resection were retrospectively analyzed, and, the levels of preoperative C-reactive protein (CRP) and albumin were included as parameters of mGPS. The incidence of overall postoperative complications was 44.81% (121/270), including 46.77% (87/186) of CD and 40.48% (34/84) of UC. According to multivariate analysis, mGPS (CD: OR = 3.47, p = 0.003; UC: OR = 3.28, p = 0.019) was independently associated with an increased risk of postoperative complications. Patients with a higher mGPS also suffered longer postoperative stay and increased SSIs (both p < 0.05). Combining mGPS with neutrophil ratio improved its prognostic value with a better area under the curve (AUC), using receiver operating characteristic (ROC) method. Then we confirmed that mGPS was associated with postoperative complications in IBD patients undergoing elective bowel resection and the addition of neutrophil ratio enhanced its prognostic value.

Risk factors of small bowel obstruction following total proctocolectomy and ileal pouch anal anastomosis with diverting loop-ileostomy for ulcerative colitis

Small bowel obstruction (SBO) often occurs after total proctocolectomy and ileal pouch anal anastomosis with diverting loop‐ileostomy for ulcerative colitis. Little is known about the association between SBO and surgical procedures for diverting loop‐ileostomy. We conducted a multicenter, retrospective questionnaire survey. Unlinkable anonymized data on ileostomy procedures and ileostomy‐related complications including SBO were collected from institutions specializing in surgery for inflammatory bowel disease. In total, 515 patients undergoing total proctocolectomy and ileal pouch anal anastomosis with loop‐ileostomy among 1022 patients with ulcerative colitis undergoing surgery during a 3‐year period between 2012 and 2014 were analyzed. Twenty‐nine patients without information on complications were excluded. Incidence of ileostomy‐related complications and factors associated with the development of small bowel obstruction were determined in 486 patients. The most common complications were parastomal dermatitis (n=169, 34.8%), SBO (n=111, 22.8%), mucocutaneous dehiscence (n=59, 12.1%), stoma prolapse (n=21, 4.3%), parastomal hernia (n=12, 2.5%), and stoma retraction (n=11, 2.3%). Incidence of small bowel obstruction was significantly higher in patients with distance from the ileal pouch to the ileostomy of less than 30 cm and in patients undergoing laparoscopic surgery. Procedures for diverting loop‐ileostomy after surgery for ulcerative colitis varied among institutions. Incidence of small bowel obstruction was high after total proctocolectomy and ileal pouch anal anastomosis with diverting loop‐ileostomy. Shorter distance between the pouch and the stoma and the laparoscopic surgery were risk factors for SBO in univariate analysis.

Immunosuppressive medication is not associated with surgical site infection after surgery for intractable ulcerative colitis in children

Pediatric ulcerative colitis (UC) sometimes progresses to an intractable condition for medical therapy. The surgical management of UC is challenging because of difficult procedures and frequent infectious complications. The aim of this study was to survey surgical procedures and infectious complications in pediatric patients with UC in Japan and to assess the relationship between preoperatively administered immunosuppressive drugs and postoperative surgical site infection (SSI). A survey of pediatric patients treated from 2000 to 2012 was sent to 683 facilities nationwide. Secondary questionnaires were sent to physicians who followed up patients with UC who had undergone surgery with the aim of assessing the relationships between postoperative SSI and selected preoperative patient characteristics, disease severity, medications, and operative procedures. Data for 136 patients (77 boys and 59 girls) were assessed. Median age at surgery was 14.1 years (range: 2.4-18.9 years). Surgery was performed in one stage in 35 cases, two stages in 57 cases, and three stages in 44 cases. SSI occurred in 36/136 patients (26%). According to multiple logistic regression analysis, there were statistically significant associations between SSI and staged surgery (three/one, OR: 6.7, 95% CI: 2.1-25.5, p = 0.0007; three/two, OR: 3.4, 95% CI: 1.4-8.6, p = 0.0069) and female sex (OR: 2.3, 95% CI: 1.0-5.4, p = 0.0434). Preoperative medications and incidence of SSI were not significantly associated. Preoperative immunosuppressive medication does not affect the incidence of SSI. Three-stage surgery and female sex are independent predictors of development of postoperative SSIs in pediatric patients with UC.

Impact of sarcopenia on surgical site infection after restorative proctocolectomy for ulcerative colitis

PURPOSE

The coexistence of sarcopenia is associated with postoperative complications, including infection after abdominal surgery. We evaluated the association between sarcopenia and surgical site infection (SSI) after surgery for ulcerative colitis.

METHODS

The subjects of this retrospective study were 69 patients who underwent restorative proctocolectomy with perioperative abdominal computed tomography (CT). Sarcopenia was diagnosed by measuring the cross-sectional area of the right and left psoas muscles as the total psoas muscle area on CT images. We assessed whether sarcopenia was associated with SSI and clinical factors, including nutritional and inflammatory markers.

RESULTS

The lowest quartiles defined as sarcopenia in men and women were 567.4 and 355.8 mm²/m², respectively. According to this classification, 12 men and 6 women had sarcopenia. Patients with sarcopenia had a lower body mass index (p = 0.0004) and a higher C-reactive protein concentration (p = 0.05) than those without sarcopenia. SSIs were identified in 12 patients (17.3 %) and included six pelvic abscesses and seven wound infections. According to multivariate analysis, sarcopenia was an independent risk factor for SSI (odds ratio = 4.91, 95 % confidence interval 1.09-23.5, p = 0.03).

CONCLUSION

Sarcopenia is predictive of SSI after pouch surgery for ulcerative colitis.

A clinical trial of autologous adipose-derived regenerative cell transplantation for a postoperative enterocutaneous fistula

PURPOSE

Adipose-derived stem cell (ADSC) transplantation is expected to be a minimally invasive, but effective, treatment for postoperative enterocutaneous fistulas associated with poor blood flow and chronic inflammation. The aim of this study was to assess the safety and efficacy of a novel ADSC therapy for this condition.

METHODS

We conducted an open-label, single-arm exploratory phase I study to assess the safety and efficacy of a novel ADSC therapy. Using the Celution system, we isolated adipose-derived regenerative cells (ADRCs) containing abundant ADSCs from liposuction-obtained gluteal adipose tissue. A mixture of ADRCs and fibrin glue was subsequently transplanted into the fistula, and ADRCs were percutaneously and endoscopically injected around the fistula. We evaluated the safety and feasibility of ADRC transplantation and fistula closure in six patients (UMIN000007316).

RESULTS

ADRC transplantation was completed in all patients. The fistula closure rates were 83.3 % at 4 and 12 weeks and 100 % at 24 weeks. All patients had grade 1 pain and subcutaneous hemorrhage at the liposuction sites, but no serious adverse events related to this procedure were observed.

CONCLUSIONS

Transplantation of autologous ADRCs is safe, feasible and advantageous, as it can secure a sufficient cell count without culture or multiple passages, and will likely be effective for a postoperative enterocutaneous fistula.

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 preoperative low nutritional prognostic index correlates with the incidence of incisional surgical site infections after bowel resection in patients with Crohn's disease

PURPOSE

The incidence of incisional surgical site infections (SSIs) is reported to be higher among patients with Crohn's disease (CD) than among those with colorectal cancer. It has also been reported that the preoperative nutritional and inflammatory status is associated with the frequency of postoperative complications. Onodera's prognostic nutritional index (OPNI) is a simple and useful parameter for determining the nutritional and inflammatory status. In the present study, we retrospectively investigated the correlation between the OPNI and the incidence of incisional SSI in patients with CD who had undergone bowel resection.

METHODS

A total of 177 CD patients who underwent abdominal surgery were enrolled. Various clinical factors and the OPNI values were evaluated to identify risk factors for incisional SSIs.

RESULTS

The incidence of incisional SSIs was 19.8 %. A multivariate analysis indicated that the OPNI was an independent risk factor for incisional SSIs.

CONCLUSIONS

The results of this retrospective study suggest that the OPNI is an independent risk factor for incisional SSIs in patients with a history of bowel resection for CD.