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Erschienen in: International Journal of Colorectal Disease 12/2019

Open Access 08.11.2019 | Short Communication

High risk of septic complications following surgery for Crohn's disease in patients with preoperative anaemia, hypoalbuminemia and high CRP

verfasst von: Ahmed S. Ghoneima, Karen Flashman, Victoria Dawe, Eleanor Baldwin, Valerio Celentano

Erschienen in: International Journal of Colorectal Disease | Ausgabe 12/2019

Abstract

Aim

Bowel resection in Crohn's disease still has a high rate of complications due to risk factors including immune suppression, malnutrition and active inflammation or infection at the time of operating. In this study, we use serological levels and inflammatory markers to predict the potential of complications in patients undergoing resections for complicated Crohn's disease.

Methods

All patients undergoing laparoscopic bowel resection for Crohn’s disease from 5th of November 2012 to 11th of October 2017 were included in this retrospective observational study. Patients were divided into 4 groups scoring 0, 1, 2 or 3 depending on their pre-operative haemoglobin concentration (Hb), C-reactive protein (CRP) and albumin (Alb) where 1 point was given for an abnormal value in each as detailed in the definitions. They were then grouped into a low risk group comprised of those scoring 0 and 1, and a high risk group for those scoring 2 and 3 and data was collected to compare outcomes and the incidence of septic complications.

Results

Seventy-nine patients were included. Eleven (13.9%) and 2 (2.5%) patients had 2 or 3 abnormal values of CRP, Alb and Hb and were categorized as high risk. High risk patients had a significantly higher rate of post-operative septic complications (30.7%) compared with low risk patients (10.6%) p value < 0.0001.

Conclusion

Pre-operative CRP, haemoglobin and albumin can serve as predictors of septic complications after surgery for Crohn’s disease and can therefore be used to guide pre-operative optimisation and clinical decision-making.
Hinweise
Preliminary data from the same database was presented as a poster in the ACPGBI 2018 Annual Meeting, 09–11 July 2018, Birmingham, UK

Publisher's note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Introduction

Crohn’s disease (CD) is a chronic inflammatory bowel disease (IBD) that may involve any part of the alimentary tract from mouth to anus; it affects all layers of the intestine from mucosa to serosa and is often discontinuous along the longitudinal axis with a propensity for the distal small intestine and proximal large bowel. Although advances in the medical treatment of the disease have reduced the need for surgery in IBD over the past 60 years [1], 50% of CD patients will require surgery after 10 years of diagnosis [1]. Indications for surgery in CD include [2] bowel perforations, intra-abdominal abscess formation, gastrointestinal bleeding, symptomatic fibrotic stricture, enteric fistulae, small bowel or colorectal cancer on top of long-standing inflammatory disease, persistent inflammation with symptoms refractory to medical therapy and disease limited to the terminal ileum after considering risks and benefit. Although bowel resection for CD is increasingly being undertaken laparoscopically with better recovery and shorter hospital stays compared with open operations [3], surgery in CD patients still has a high rate of complications [46] due to risk factors including immune suppression [7, 8], malnutrition [8, 9] and active inflammation or infection at the time of operating [8, 9]. Knowledge of risk factors and the ability to foresee complications pre-operatively is therefore necessary in CD patients undergoing surgical treatment. In this study, we use pre-operative serological levels and inflammatory markers to predict the potential of complications in patients undergoing resections for complicated CD.

Methods

Study design

All patients undergoing ileocaecal, small bowel and colonic resections on elective theatre lists for CD from 5th of November 2012 to 11th of October 2017 were included in this retrospective observational study based on a prospectively maintained database. The study was designed according to the STROBE checklist. All patients undergoing open, robotic or hand-assisted surgery for CD were excluded as were patients undergoing emergency operations and operations that did not entail a resection (e.g., stricturoplasties only).
The indication for surgery was discussed at a dedicated IBD multi-disciplinary team meeting (MDT) and pre-operative assessment included colonoscopy, MRI enterography and intestinal ultrasound. Before the planned surgical procedure, the patients were reviewed in a dedicated pre-assessment outpatient clinic where patients with significant weight loss prior to surgery were referred to the dietitian team for optimisation and iron infusion was consider if the value of the haemoglobin concentration (Hb) was less than < 10 g/dL.
Patients were divided to 4 groups scoring 0, 1, 2 and 3 depending on their pre-operative Hb, C-reactive protein (CRP) and albumin (Alb) where 1 point was given for an abnormal value in each as detailed in the definitions. They were then grouped into a low risk group comprised of those scoring 0 and 1, and a high risk group for those scoring 2 and 3 and data was collected to compare outcomes and the incidence of complications.

Definitions

Pre-operative blood tests are defined as values obtained during pre-operative assessment within 1 week from the operation. Abnormal values were defined as Hb < 12 g/dL [5], CRP > 30 mg/L and albumin < 35 g/L [4, 5]. Post-operative complications are defined as occurring within 30 days of surgery. Intra-abdominal septic complications (IASC) is a term that collectively describes intra-abdominal abscesses, pus collections and anastomotic leaks [9].

Primary and secondary outcomes

The primary outcome was the rate of septic complications including wound infections (SSI), anastomotic leaks and intra-abdominal collections.
Secondary outcomes included post-operative length of stay, readmission and reoperation rate.

Statistical analysis

Categorical variables are presented as frequency or percentage and were compared with the use of the chi-square test or Fisher’s exact test, as appropriate. Continuous variables are presented as mean (± standard deviation) or median (range) and were compared with the use of Student’s t test. The Mann-Whitney U test was used for continuous, not normally distributed outcomes.

Ethics

The study is conducted in accordance with the principles of the Declaration of Helsinki and ‘good clinical practice’ guidelines. Informed consent has been obtained from the patients.

Results

Eighty-eight patients underwent elective laparoscopic bowel resection for CD during the study period, and after the exclusion of 9 patients in whom the pre-operative CRP and/or albumin were not available, 79 patients (24 male, 55 female) were included in the study. Median age was 38 (28–49) and 30 patients (38%) had history of previous abdominal surgery performed via laparotomy for non-CD-related reasons.
The indications for surgery were fibrostenotic disease in 50 patients (63.3%) and penetrating disease with entero-enteric, entero-colic or entero-urinary fistulae in 29 patients (36.7%). Six procedures (7.6%) were converted to open and 13 patients (16.4%) had an ileostomy fashioned at the time of the surgery. Median LOS was 9 days (7.5–9.5) and 4 patients were readmitted (5%) while 3 patients required reoperation (3.8%). There were 24 post-operative complications (30%).
Almost 50% of our patient population had one or more pre-operative abnormal values of Hb, albumin and CRP. Patients with none or one pre-operative abnormal blood results (low Hb, low Alb and high CRP) were categorized as low risk, while patients with two or three abnormal results of were defined as high risk, and post-operative outcomes in these two populations are presented in Table 1, demonstrating a statistically significant higher rate of intra-abdominal septic complications in patients with two or more pre-operative blood results abnormalities.
Table 1
30-day postoperative complications. Data presented as number (%)
Group (score)
Low risk (score 0–1)
High risk (score 2–3)
p value
Total number of patients
66
No risk factors: 40 (50.63%)
1 risk factor: 26 (32.91%)
13
2 risk factors: 11 (13.92%)
3 risk factors: 2 (2.53%)
 
Overall complications
17 (25.76%)
7 (53.85%)
< 0.0001
Surgical site infection
7 (10.6%)
6 (46.15%)
< 0.0001
Intra-abdominal septic complications (IASC)
7 (10.6%)
4 (30.77%)
< 0.0001
Bleeding
3 (4.55%)
1 (7.69%)
ns
Ileostomy formation required
6 (9%)
7 (53.8%)
< 0.0001
Mean length of hospital stay in (Days)
8.6
11
< 0.001
Pre-operative anti-TNF treatment
24 (36.4%)
5 (38.4%)
ns
Pre-operative steroids treatment
14 (21.2%)
4 (30.7%)
ns

Discussion

Surgery for CD carries high risks of complications including [4] wound infections, anastomotic leak and intraabdominal sepsis [8, 9]. Ileocaecal resections for CD have a similar complication profile to those undergoing a similar operation for cancer [6], despite patients being around 30 years younger with far less co-morbidity.
The tendency for formation of fistulae, abscesses, and large phlegmons, multifocal disease and thickened mesentery make CD resection technically challenging [10]; therefore, it should be undertaken in centres with high procedural caseloads and dedicated surgeons as core members of the IBD multi-disciplinary team [11] with the aim to prevent emergency surgery, postoperative complications and recurrence.
Risk factors leading to high complication rates in CD surgery include immune suppression [4, 10] as corticosteroid therapy within 3 months before surgery [7, 8] and higher pre-operative serum biological levels, malnutrition measured by loss of > 10% of weight in 6 months or albumin levels < 25 g/l [8, 9], repeated episodes of disease flare up [10] and the presence of fistulas and/or abscesses at the time of operating [8, 9]. The presence of more than one of these factors compounds the risk of complications, specifically intra-abdominal septic complications, where the presence of one or two risk factor leads to an incidence of 14–16%, three risk factors leads to 26–29% and four leads to 50–100% [8, 9].
Our study found that a significant proportion of patients undergoing elective surgery for primary ileocaecal CD had pre-operative blood test abnormalities, as almost 50% of our patients had one or more abnormal preoperative albumin, Hb or CRP. The presence of anaemia and hypoalbuminemia, or high CRP pre-operatively has a cumulative effect on the risk of incidence of post-operative intra-abdominal septic complications and prolonged post-operative length of hospital stay. We found a high rate of post-operative septic complications following ileocolic CD surgery, with 11 patients out of 79 (13.9%) experiencing intra-abdominal sepsis such as anastomotic leaks and intra-abdominal collections, similar to the previous studies [12].
Our results suggest that abnormal pre-operative serological markers can reflect risk factors and in turn predict post-operative complications. Knowledge of these risk factors may be beneficial when consenting patients for surgery regarding risks and expectations of the post-operative recovery period as well as guiding the need of pre-operative optimization e.g. entral/parenteral nutrition and decisions of intervention e.g. formation of defunctioning stoma rather than anastomosis.
Our study did not include patients having emergency surgery or surgery for recurrent CD as these two groups are known for an increased risk of overall complications and post-operative anastomotic leaks and collection. Our database did not include patients undergoing open surgery which is a limitation of this study. Nevertheless, our unit has been one of the major contributing centres for the national laparoscopic surgery training program in Great Britain (LAPCO) and all major laparoscopic resections are performed according to a standardized technique. Open surgery is now rarely offered in our minimally invasive unit in the elective setting and therefore the number of patients not recruited as having undergone elective open surgery for primary ileocaecal CD is likely to be irrelevant.
Another limitation of our study is that no direct patient-reported outcome measures have been assessed and no data have been collected on rate and length of post-operative admission to intensive care, which could be set as objectives for further prospective studies with patients stratified according to disease phenotype, pre-operative medical treatment and CD activity scores.

Conclusion

Our study confirms that pre-operative CRP, haemoglobin and albumin can serve as predictors of septic complications after surgery for Crohn’s disease and can therefore be used to guide pre-operative optimisation and clinical decision-making.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Publisher's note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Metadaten
Titel
High risk of septic complications following surgery for Crohn's disease in patients with preoperative anaemia, hypoalbuminemia and high CRP
verfasst von
Ahmed S. Ghoneima
Karen Flashman
Victoria Dawe
Eleanor Baldwin
Valerio Celentano
Publikationsdatum
08.11.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
International Journal of Colorectal Disease / Ausgabe 12/2019
Print ISSN: 0179-1958
Elektronische ISSN: 1432-1262
DOI
https://doi.org/10.1007/s00384-019-03427-7

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