Primary studies included in this systematic review

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Primary study

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Journal Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland
Year 2016
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AIM: This study aimed to evaluate the implementation of nonantibiotic management of acute uncomplicated diverticulitis at a large university hospital in Norway with regard to management failure, disease recurrence and complications. METHOD: On 1 January 2013 we implemented a new policy for the management of acute uncomplicated diverticulitis without antibiotics. Antibiotic treatment was only provided in the case of defined criteria. All patients admitted from 1 January 2013 to 30 June 2014 with a CT-verified, left-sided, acute uncomplicated diverticulitis were included in the study and evaluated retrospectively, with 12 months' follow-up. RESULTS: Of 244 admissions with acute uncomplicated diverticulitis, 177 (73%) were managed without antibiotics. Among these there were seven (4%) management failures, including five patients in whom a deteriorating clinical picture prompted antibiotic treatment and two readmissions within 1 month due to persisting symptoms. The only complication in this group was one fistula (< 1%). Eight (5%) patients had a recurrence of acute diverticulitis requiring hospital care and two (1%) underwent elective surgery within the first year. Twenty (8%) patients met predefined exemption criteria and received antibiotics from admission, six (30%) of whom developed complications. The recurrence rate in this group was 10% and none had surgery performed. The 47 (20%) policy violators treated with antibiotics from admission had no complications. Their recurrence rate was 11% and one (2%) patient underwent elective surgery. CONCLUSION: This study confirms that nonantibiotic management of acute uncomplicated diverticulitis is safe and feasible. Most complications occurred in a small group of high-risk patients treated with antibiotics.

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Journal Diseases of the colon and rectum
Year 2016
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BACKGROUND: Even though evidence for nonantibiotic treatment of uncomplicated diverticulitis exists, it has not gained widespread adoption. OBJECTIVE: The aim of this prospective single-arm study was to analyze the safety and efficacy of symptomatic (nonantibiotic) treatment for uncomplicated diverticulitis during a 30-day follow-up period. DESIGN: This study is a single-arm prospective trial (ClinicalTrials.gov ID NCT02219698). SETTINGS: This study was performed at an academic teaching hospital functioning as both a tertiary and secondary care referral center. PATIENTS: Patients, who had CT-verified uncomplicated acute colonic diverticulitis (including diverticulitis with pericolic air), were evaluated for the study. Patients with ongoing antibiotic therapy, immunosuppression, suspicion of peritonitis, organ dysfunction, pregnancy, or other infections requiring antibiotics were excluded. INTERVENTIONS: Symptomatic in-or outpatient treatment consisted of mild analgesics (nonsteroidal anti-inflammatory drug or paracetamol). MAIN OUTCOME MEASURES: The incidence of complicated diverticulitis was the primary outcome. RESULTS: Overall, 161 patients were included in the study, and 153 (95%) completed the 30-day follow-up. Four (3%) of these patients were misdiagnosed (abscess in the initial CT scan). A total of 14 (9%) patients had pericolic air. Altogether, 140 (87%) patients were treated as outpatients, and 4 (3%) of them were admitted to the hospital during the follow-up. None of the patients developed complicated diverticulitis or required surgery, but, 2 days (median) after inclusion, antibiotics were given to 14 (9%, 6 orally, 8 intravenously) patients. LIMITATIONS: This study is limited by the lack of a comparison group and by the relatively short follow-up. CONCLUSIONS: Symptomatic treatment of uncomplicated diverticulitis without antibiotics is safe and effective.

Primary study

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Journal Techniques in coloproctology
Year 2016
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BACKGROUND: A growing body of knowledge is calling into question the use of antibiotics in acute diverticulitis (AD). Moreover, recent studies provide evidence regarding the security of treating patients with AD as outpatients. The aim of this study was to evaluate a restrictive antibiotic outpatient protocol for the treatment of mild-to-moderate episodes of AD. METHODS: All patients with symptoms of AD presenting to our emergency department were assigned a modified Neff stage. Patients with mild AD received outpatient treatment without antibiotics. Patients with mild AD and comorbidities were admitted to receive the same treatment. Patients with moderate AD were admitted for 48 h and were then managed as outpatients until they had completed 10 days of antibiotic treatment. RESULTS: Between April 2013 and November 2014, we attended 110 patients with a diagnosis of AD, 77 of whom we included in the study: 45 patients with mild AD and 32 with moderate AD. Of the patients with mild AD, 88.8 % successfully completed the non-antibiotic, non-admission treatment regime and 95.5 % benefited from a non-antibiotic regime, whether as outpatients or inpatients. A total of 88 % of patients with mild AD and 87.5 % of patients with moderate AD who met the inclusion criteria completed treatment as outpatients without incident. No major complications (abscess, emergency surgery) or deaths were recorded. CONCLUSIONS: Outpatient treatment without antibiotics for patients with mild AD is safe and effective. Patients with moderate AD can be safely treated with antibiotics in a mixed regime as inpatients and outpatients.

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Primary study

Unclassified

Journal Scandinavian journal of gastroenterology
Year 2014
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BACKGROUND: The first randomized multicenter study evaluating the need for antibiotic treatment in patients with acute uncomplicated diverticulitis (AUD) could not demonstrate any benefit gained from antibiotic use. The aim of this study was to review the application of the no antibiotic policy and its consequences in regard to complications and recurrence. METHODS: This retrospective population-based cohort study included all patients diagnosed with all types of colonic diverticulitis during the year 2011 at Västmanland Hospital Västerås, Sweden. All medical records were carefully reviewed. Primary outcomes were the types of treatment adopted for diverticulitis, complications and recurrence. RESULTS: In total, 246 patients with computer tomography-verified diverticulitis were identified, 195 with primary AUD and 51 with acute complicated diverticulitis. Age, sex, and temperature at admission were similar between the groups but there was a significant difference in white blood cell count, C-reactive protein, and length of hospital stay. In the AUD group, 178 (91.3%) patients were not treated with antibiotics. In this group, there were six (3.4%) readmissions but only two developed an abscess. Of the remaining 17 patients (8.7%) who were treated with antibiotics in the AUD group, one developed an abscess. Twenty-five (12.8%) patients in the AUD group presented with a recurrence within 1 year. CONCLUSION: The no-antibiotic policy for AUD is safe and applicable in clinical practice. The previous results of a low complication and recurrence rate in AUD are confirmed. There is no need for antibiotic treatment for AUD. What does this paper add to the literature? Despite published papers with excellent results, there are still doubts about patient safety against the policy to not use antibiotics in acute uncomplicated diverticulitis. This is the first paper, in actual clinical practice, to confirm that the no antibiotic policy for acute uncomplicated diverticulitis is applicable and safe.

Primary study

Unclassified

Journal Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland
Year 2012
AIM: Conservative treatment of mild colonic diverticulitis usually consists of observation, restriction of oral intake, intravenous fluids and antibiotics. The beneficiary effect of antibiotics remains unclear. The aim of this study is to evaluate the need for antibiotics in mild colonic diverticulitis. METHOD: A retrospective case-control study was performed in 272 patients with mild colonic diverticulitis admitted to two hospitals with distinctly different treatment regimes concerning antibiotic use. RESULTS: A total of 191 patients were treated without antibiotics and 81 with antibiotics. Groups were comparable at baseline with respect to age, sex, comorbidity, and use of nonsteroid anti-inflammatory drugs, steroids and aspirin. All patients had imaging-confirmed diverticulitis. C reactive protein and white blood count levels did not differ significantly. In the antibiotics group there were significantly more patients with a temperature of 38.5°C or higher on admission. (8 vs 19%; P=0.014). Treatment failure did not differ between groups (4 vs 6%; P=0.350). The risk of recurrence was higher in the antibiotics group on logistic regression analysis but did not reach statistical significance (odds ratio, 2.04; confidence interval, 0.88-4.75; P=0.880). The only factor that increased the risk of recurrence was nonsteroid anti-inflammatory drug use (odds ratio, 7.25; confidence interval, 1.22-46.88; P=0.037). CONCLUSION: Antibiotics can be omitted in selected patients with mild colonic diverticulitis and should be given on indication only.

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Primary study

Unclassified

Journal Scandinavian journal of gastroenterology
Year 2007
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OBJECTIVE: Most patients admitted for acute colonic diverticulitis (AD) are managed conservatively and receive antibiotics, although it is uncertain whether all patients with AD benefit from this treatment. The aim of this study was to evaluate the influence of antibiotic treatment on outcome in the conservative management of patients with mild AD. MATERIAL AND METHODS: A retrospective audit of 311 patients (64% F, mean age 60 years) hospitalized for AD was carried out. All patients were initially treated conservatively with observation and restriction of oral intake. Patients receiving antibiotics (n=118) were compared with patients treated with observation and restriction of oral intake only (n=193). Mean follow-up time (FU) was 30 months. RESULTS: Inflammation in patients treated with antibiotics was more pronounced (laboratory parameters (C-reactive protein, white blood cell count) were higher (p<0.01), fever was more common (p<0.01) and CT grading of inflammation was classified as severe in a higher proportion (p<0.01)) compared with patients treated without antibiotics. When initially treated with antibiotics, 3 patients (3%) failed to respond to treatment and had to undergo surgery. There were 7 (4%) failures in patients initially treated without antibiotics, and antibiotics were then added. During FU, 29% of patients treated with antibiotics had further events (recurrent AD and/or subsequent surgery) compared with 28% (NS) among those treated without antibiotics. In a multivariate analysis, the risk of a further event was not influenced by antibiotic treatment (OR 1.03, CI 95% 0.61-1.74). CONCLUSIONS: Our results indicate that antibiotics are not mandatory in mild AD. Treatment without antibiotics appears to be safe and seems not to change the rate of further events. These results warrant further randomized prospective studies.