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Natural History of Sigmoid Diverticulitis: The Geneva Cohort Study

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01015378
Recruitment Status : Unknown
Verified November 2009 by University Hospital, Geneva.
Recruitment status was:  Recruiting
First Posted : November 18, 2009
Last Update Posted : June 25, 2010
Information provided by:
University Hospital, Geneva

Brief Summary:

Aim: This is a longitudinal cohort study to assess long-term clinical outcome of patients who were admitted in our institution for a first episode of uncomplicated sigmoid diverticulitis.

Methods: All patients who were diagnosed with a first episode of sigmoid diverticulitis will be evaluated for inclusion in the study, pending informed consent. Those patients who have evidence of complicated diverticulitis (fistula, abscess) will receive a recommendation to undergo elective sigmoid resection, while those who have a simple attack will be recruited in the cohort. Follow-up will be performed at yearly intervals through telephone interview with the patient. The duration of study is expected to last 10 years (2010-2020), with >50 new patients/year, for a total of >500 patients.


  1. the occurrence of a second episode of diverticulitis
  2. severity and outcome of recurrent diverticulitis
  3. evolution in digestive symptoms and quality of life (QoL)
  4. need for subsequent elective or emergency sigmoid resection

Rationale: This study will help in determining the risk/benefit of the current approach for this common condition, which is to manage patients conservatively with antibiotics and adopt a wait-and-see attitude. Specifically, the following events will be assessed quantitatively:

  • the rate of relapse in an urban community.
  • the burden of this common disease on QoL and digestive function
  • the percentage of patients who may need emergency surgery

Condition or disease Intervention/treatment
Diverticulitis Procedure: laparoscopid sigmoid resection

Detailed Description:

Colonic diverticulosis is an increasingly common condition in the Western societies; in our country, a third of the population is affected by the 6th decade and two-thirds by the 9th decade. Fortunately, a majority of patients with diverticulosis remain asymptomatic; diverticulitis, the most common presentation of diverticular disease, has an estimated incidence of 10 patients per 100,000/year.

The diagnosis of sigmoid diverticulitis is usually suspected clinically in a patient presenting with acute lower abdominal pain, associated with an inflammatory syndrome with elevated CRP and/or leukocytes count. The preferred imaging modality to establish definitive diagnosis is computerized tomography (CT) scan with triple (oral, intravenous and intra-rectal) administration of contrast. CT scan may also influence management by demonstrating whether sigmoid diverticulitis is simple (phlegmonous, showing an infiltration of pericolic fat and a thickening of intestinal wall) or complicated (abscess, fistula or peritonitis).

A majority of patients present with simple diverticulitis, and will be conservatively and successfully managed with antibiotics alone. Full colonoscopy is performed eventually, in order to rule out an associated condition, most notably cancer and Crohn's disease. Colonic diverticular disease is usually restricted to the sigmoid colon, and conservative treatment with antibiotics is indicated in cases of a first attack of uncomplicated diverticulitis, the rationale being that a majority of patients treated for a first episode of acute inflammation will eventually recover and have no further problems.

Elective sigmoidectomy is currently recommended in the following clinical situations:

  • Patients who had two episodes of uncomplicated diverticulitis.
  • Patients who had one episode of complicated (perforated) diverticulitis, with either pericolic of pelvic abscesses (Hinchey stage I and II respectively), fistula formation and/or stenosis.

These guidelines, however, reflect expert consensus rather than scientific evidence; currently, there is no way to predict for each patient the risk for developing subsequent complications and recurrences. Thus, the important question is to determine whether a conservative approach is not simply delaying definitive treatment and expose patients to additional complications and alterations in quality of life.


The main objective of this study is to assess the natural history of sigmoid diverticulitis in a cohort of patients living in an urban community, who had radiological and endoscopic evidence of diverticular disease, who benefited initially from adequate antibiotherapy, received dietary counselling, and were followed for a long period of time. In order to do that, we will assess prospectively the following variables:

3.1. Primary endpoints

  • Annual rate of recurrent diverticulitis
  • Severity and timing of recurrent episodes
  • Quality of Life and gastrointestinal symptoms assessed with the GIQLI questionnaire

3.2. Secondary endpoints

  • Risk for undergoing emergency surgery
  • Surgical morbidity/mortality

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Study Type : Observational
Estimated Enrollment : 500 participants
Observational Model: Cohort
Time Perspective: Prospective
Study Start Date : January 2007
Estimated Primary Completion Date : January 2012
Estimated Study Completion Date : January 2017

Resource links provided by the National Library of Medicine

Group/Cohort Intervention/treatment
Diverticulitis of the sigmoid colon - first episode Procedure: laparoscopid sigmoid resection
A second episode of diverticulitis will be treated with IV antibiotics and documented with CT scan and blood tests

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

This cohort study is designed in order to detect recurrent episodes of diverticulitis in a population of patients who were previously admitted in our institution for a first episode.

4.1. Study population

The cohort will consist in the population of patients with CT-scan demonstrated, endoscopy-proven sigmoid diverticulitis who will be admitted in the Department of Surgery of the University Hospital Geneva from January 1st, 2010 to December 31st, 2019. At baseline, participants are between the ages of 18 and 90, and medical information will be updated every year until the end of follow-up, which is December 31st, 2020.


4.2. Inclusion criteria

  • Informed consent
  • A first episode of uncomplicated diverticulitis (see definitions), which was documented with CT scan, required hospital admission, and was successfully managed with intravenous antibiotics Or
  • A first episode of complicated diverticulitis (Hinchey I or II - see definition), requiring CT scan-guided percutaneous drainage, and successfully managed without surgery in a patient either unfit for, or refusing to undergo elective sigmoid resection Exclusion criteria
  • Age < 18 or > 90
  • Associated condition of the colon or rectum (cancer, IBD, polyps)
  • Patient unable to communicate in French, English or German

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01015378

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University Hospital Geneva Recruiting
Geneva, Switzerland, 1211
Contact: Beatrice Konrad   
Principal Investigator: Pascal Gervaz, MD         
Sponsors and Collaborators
University Hospital, Geneva
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Pascal Gervaz, Department of Surgery, University Hospital and Medical School Geneva SWitzerland Identifier: NCT01015378    
Other Study ID Numbers: CODIGE
First Posted: November 18, 2009    Key Record Dates
Last Update Posted: June 25, 2010
Last Verified: November 2009
Keywords provided by University Hospital, Geneva:
Recurrent sigmoid diverticulitis
Additional relevant MeSH terms:
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Diverticular Diseases
Intraabdominal Infections
Gastrointestinal Diseases
Digestive System Diseases