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Correspondence to: Min-Hsin Yang, MD, Department of Emergency, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan. email@example.com
Telephone: +886-2-87923311 Fax: +886-2-87927411
AIM: To investigate the comorbid disease could be the predictors for the elective colectomy in colonic diverticulitis.
METHODS: A retrospective chart review of 246 patients with colonic diverticulitis admitted between 2000 and 2008 was conducted, and 19 patients received emergent operation were identified and analyzed. Data were collected with regard to age, sex, albumin level on admission, left or right inflammation site, the history of recurrent diverticulitis, preoperative comorbidity, smoking habits, medication, treatment policy, morbidity, and mortality. Preoperative comorbid diseases included cardiovascular disease, diabetes, pulmonary disease, peptic ulcer disease, gouty arthritis, and uremia. Medications in use included non-steroidal anti-inflammatory drugs, acetylsalicylic acid (Aspirin), and corticosteroids. Univariate and multivariate logistic regression analyses were performed to identify the relevant risk factors correlating to colectomy.
RESULTS: The mean age of the 246 patients was 69.5 years (range, 24-94 years). Most diverticulitis could be managed with conservative treatment (n = 227, 92.3%), and urgent colectomy was performed in 19 patients (7.7%). There were three deaths in the surgical group and four deaths in the nonsurgical group. The overall mortality rate in the study was 1.7% among patients with conservative treatment and 15.7% among patients undergoing urgent colectomy. Multiple logistic regression analysis indicated that comorbidities were risk factors for urgent colectomy for diverticulitis.
CONCLUSION: To avoid high mortality and morbidity related to urgent colectomy, we suggest that patients with colonic diverticulitis and comorbid diseases may require elective colectomy.
Core tip: Colonic diverticulitis can usually be managed with conservative treatment. However, in select groups of patients with recurrent persistent infection causing life-threatening septic shock, emergent and risky surgical management may be necessary. Elective colectomy for diverticulitis has been discussed in many reports. However, the criteria for elective surgery for colonic diverticulitis still remain controversial. Our data indicate that diverticulitis with comorbid disease increases the operative risk in urgent surgery. Therefore, if a patient has diverticulitis with comorbid disease, an elective colectomy may prevent the consequences of an urgent operation.
Diverticular disease of the colon has an overall prevalence of less than 10% in individuals under 40 years old and an estimated 50%-66% prevalence in individuals 80 years old or older[1-4]. A diverticulum is the herniation of the mucosa and submucosa through the muscular layers of the colon and occurs because of increased intraluminal pressure and weakness in segments of the colonic wall. Overall, 10%-25% of patients with diverticular disease will experience diverticulitis and its complications[6,7]. Diverticulitis is the inflammation of a diverticulum or diverticula and can be classified as uncomplicated or complicated. Cases involving abscesses, perforation, obstruction, fistula formation or peritonitis are defined as complicated diverticulitis. They may require percutaneous drainage of an abscess or emergent surgery. On the other hand, elective colectomy is recommended if an episode of complicated diverticulitis was treated non-operatively[5,6]. Elective colectomy to prevent recurrent attacks of diverticulitis or emergent surgery was previously advised. However, newer recommendations have called for a revision of the practice of aggressive surgical resection in patients with uncomplicated disease, despite recurrence or age. The basis of these arguments is that a majority of patients do not appear to progress from uncomplicated to complicated disease over time[9,10]. Moreover, recurrent diverticulitis has not been demonstrated to be a risk for emergency surgery[8,9]. The aim of this study was to identify which comorbid diseases could be risk factors for urgent colectomy to aid in the management of colonic diverticulitis. Using this information, we can identify patients who may benefit from early elective colectomy.
The charts of 246 patients who had been admitted to the Tri-Service General Hospital, Taipei, Taiwan, between 2000 and 2008 with a diagnosis of diverticulitis were reviewed, and 19 patients who received emergent operations were identified and analyzed retrospectively.
Data were collected with regard to age, sex, albumin level on admission, left or right inflammation site, history of recurrent diverticulitis, preoperative comorbidity, smoking habits, medication, treatment policy, morbidity, and mortality. The diagnosis of colonic diverticulitis was based on the findings of computed tomography, which has a high diagnostic sensitivity of approximately Ninety-three percent to ninety-seven percent and a specificity of approximately 100%. Urgent colectomy was indicated in patients with peritonitis that could not be corrected by medical treatment or drainage. Preoperative comorbid diseases included cardiovascular disease (e.g., hypertensive cardiovascular disease and coronary artery disease), diabetes, pulmonary disease (e.g., chronic obstructive pulmonary disease and asthma), peptic ulcer disease (e.g., gastric ulcer and duodenal ulcer), gouty arthritis, and uremia. Medications in use included non-steroidal anti-inflammatory drugs (NSAIDs), acetylsalicylic acid (aspirin), and corticosteroids.
The mean values were compared using an independent t test, and χ2 or Fisher’s exact test was used to compare proportions. A value of P < 0.05 was considered statistically significant. Data were analyzed using SPSS version 15.0 (SPSS Inc., Chicago, IL, United States) for Windows.
In total, 246 patients were admitted with a diagnosis of colonic diverticulitis. The mean age was 69.5 years (range, 24-94 years); 144 of the 246 patients were men (58.5%), and 102 were women (41.5%). Most episodes could be managed with conservative treatment consisting of antibiotics and bowel rest (n = 227, 92.3%), but urgent colectomy was performed in 19 patients (7.7%) (Table (Table1).1). All of these patients received Hartmann’s operation. However, there were three deaths in the surgical group, two from postoperative lobar pneumonia complicated with septic shock and acute respiratory distress syndrome and the other from urinary tract infection. There were four deaths in the non-surgical group. Two deaths (ages 81 and 79 years; the patient’s family refused surgical intervention in both cases) in the nonsurgical group were the result of uncontrolled intra-abdominal infection complicated with septic shock during hospitalization. The other two deaths were due to lobar pneumonia (Table (Table2).2). The overall mortality rate was 2.8% (n = 7), and it was 15.7% (n = 3) in the group that underwent urgent colectomy. Ten patients had wound infections after colectomy, and four were returned to the operating room for surgical debridement. The morbidity rate in the urgent surgery group was 52.6% (n = 10) (Table (Table33).
Univariate analysis with logistic regression indicated that the factors associated with a greater likelihood of having an urgent colectomy were albumin level on admission (OR = 13.488, P < 0.001), comorbidity with cardiovascular disease (OR = 3.203, P = 0.019), type 2 diabetes (OR = 3.311, P = 0.019) or gouty arthritis (OR = 9.777, P < 0.001), and use of anticoagulants (OR = 3.200, P = 0.023) or NSAIDs (OR = 9.603, P < 0.001; Table Table4).4). According to the multivariate analysis with logistic regression, only the albumin level, comorbidity with type 2 diabetes, the use of NSAIDs, and smoking remained risk factors for urgent colectomy for colonic diverticular disease (Table (Table55).
Emergent surgery should be considered for diverticulitis when the patient has peritonitis from perforation or obstruction causing unstable vital signs, when the patient fails to respond to conservative treatment within the first week of hospitalization, and when the patient presents with a large abscess (> 5 cm) that is undrainable by interventional radiology. Approximately 5.5% of patients who recover from an initial episode of diverticulitis require emergency surgical intervention. Although the mortality and morbidity rates are low, in a previous study, as in our study, they are higher when an urgent operation was performed. The mortality and morbidity rates were high in our operated group (15.7% and 52.6%, respectively). These results are in agreement with previous reports that indicated that patients who require surgical intervention have high mortality and morbidity rates of approximately 4.5%-16.7% and 27.2%-71.1%, respectively[1-3]. Hartmann’s operation is a potential choice for the surgical intervention if the patient has diverticulitis with necrotic perforation. However, laparoscopic washout with diversion may be used if the patient has diverticulitis without necrotic perforation. In our study, all patients were subjected to Hartmann’s procedure because they had diverticulitis with necrotic perforation.
To prevent a delay in treatment or consequent resource waste, elective surgery for patients with comorbidities may be recommended. In the previous practice parameters for sigmoid diverticulitis, elective surgery was recommended after two episodes of diverticulitis. Richards et al demonstrated that prophylactic colectomy is associated with increased life expectancy and quality-of-life years when performed after the third attack. However, Ricciardi et al found that the decline in the surgical treatment for diverticulitis is not associated with an increase in complicated diverticulitis, which indicates that elective surgery has a minimal effect on preventing emergency colectomies. The recent recommendation of the American Society of Colon and Rectum Surgeons stated that “the decision to recommend elective sigmoid colectomy after recovery from acute diverticulitis should be made on a case-by-case basis”. The decision should be made based on the age and the medical condition of the patients, the frequency and severity of the attacks, whether there are persistent symptoms and the suspicion of the malignancy. Furthermore, elective surgery is also recommended if an episode of complicated diverticulitis is treated nonoperatively. The predictors of diverticulitis requiring surgery have not been determined, which is still a vexing problem confronting surgeons.
Our study was a retrospective analysis of 246 patients with colonic diverticulitis treated at a single medical center over 9 years. No difference was found in the distribution of colonic diverticulitis between the sexes (P = 0.671), and this trend was the same for cases requiring emergent surgery. The ages of patients with diverticulitis had no significant association with surgery (P > 0.344). Patient nutritional status upon admission affected the length of hospital stay for patients with colonic diverticulosis. Serum albumin levels correlated negatively with the length of hospital stay[16,17]. Moreover, it is well known that there is a correlation between malnutrition and infection, poor wound healing, and the overgrowth of bacteria in the alimentary tract. In the present study, 57.9% of colonic diverticulitis patients in the emergent surgery group had albumin levels below 3 g/dL, whereas this was true of only 9.3% of patients in the non-surgery group. All patients with low albumin (< 3 g/dL) levels had parenteral nutrition.
Among the comorbidities, type 2 diabetes mellitus independently increased the severity of diverticulitis (P = 0.019). It is well established that diabetes mellitus has a negative effect on immunity. Polymorphonuclear leukocyte function, leukocyte adherence, chemotaxis, and phagocytosis are all affected in patients with diabetes mellitus. Gouty arthritis have also been demonstrated to be a risk factor of urgent operation (P < 0.001). However, this relation may be because of the medication used in treatment because patients with these diseases take NSAIDs for pain control. It is known that there is a correlation between NSAIDs and perforation of colonic diverticula. Several reports have indicated that patients with perforated diverticular disease are significantly more likely to be taking NSAIDs than patients without disease[19-21]. The inhibition of cyclo-oxygenase 1 (COX-1) results in deficient levels of prostaglandins, which are related to the protection of bowel mucosa. On the other hand, COX-2 inhibition leads to the failure of the immune response to localize a microperforation. In these patients, continuation of their non-steroidal anti-inflammatory treatments is highly likely to impair colonic mucosal repair[19-21]. Cardiovascular disease has also been shown to be associated with urgent colectomy in diverticulitis. In the present study, all of the patients with cardiovascular diseases were taking acetylsalicylic acid, known as aspirin, as an anti-coagulant for preventive treatment. Aspirin is also classified as an NSAID because of its inhibition of platelet COX activity and is considered to predict colonic perforation. Smoking was one of the independent factors associated with emergent operation. Smoking may enhance or precipitate the inflammatory process in diverticulitis. Nicotine in cigarettes is a smooth muscle relaxant, which may counteract the colonic muscle spasm that correlates with the pathogenesis of diverticular disease. Nicotine may also decrease mucosal immunity by inhibiting the synthesis of proinflammatory cytokines such as interleukin a and tumor necrosis factor α in colonic mucosa. Smoking could also cause systemic sepsis via the promotion of oxidative damage by generating oxygen free radicals. Steroid treatment also has a negative effect on mucosal regenerative activity. In our study, it did not significantly predict diverticular perforation. This is most likely because the number of patients with steroid treatment in our series was small.
Our results indicated several comorbid diseases are risk factors to urgent colectomy. There were 7.7% of patients with colonic diverticular disease who had to receive urgent colectomy despite conservative treatment including antibiotics and bowel rest. Preoperative comorbid diseases may increase the operative risk in urgent surgery, and the outcome is poor. The mortality and morbidity rates are up to 15.7% and 52.6%, respectively. To avoid high mortality and morbidity related to urgent colectomy. We suggested that partients with colonic diverticulitis and comorbid disease may require elective colectomy (Figure (Figure11).
Colonic diverticulitis with comorbid disease may get fatal complication after urgent surgery. Therefore, To avoid high mortality and morbidity related to urgent colectomy, the authors suggest that patients with colonic diverticulitis and comorbid diseases may require elective colectomy.
This study is designed to clarify the predictors of elective colectomy for colonic diverticulitis.
Comorbid disease could be the predictors of elective colectomy for colonic diverticulitis.
Provide a possible policy of surgical management for the patients with colonic diverticulitis.
This is an interesting paper stressing the importance of comorbidities in the treatment of diverticulitis.
P- Reviewers Bulut O, Misiakos EP, O'Dwyer P, Ribas Y S- Editor Wen LL L- Editor A E- Editor Ma S