Surgery vs Medicine for Diverticulitis

(COSMID Trial)

Recruiting at 27 trial locations

Overseen By Giana Davidson, MD MPH

Age: 18+

Sex: Any

Trial Phase: Academic

Sponsor: University of Washington

Must not be taking: Immunosuppressants, IBD meds, IBS meds

Disqualifiers: Liver failure, Renal failure, Malignancy, others

No Placebo Group All trial participants will receive the active study treatment (no placebo)

Compensation: Varies

Number of Visits: 4

Duration: 6 weeks

250 Participants Needed

What You Need to Know Before You Apply

What is the purpose of this trial?

This trial compares surgery (removing part of the colon) with a combination of medications and lifestyle changes for patients whose diverticular disease affects their quality of life. It aims to find out which treatment helps these patients feel better and live more comfortably.

Do I need to stop my current medications for the trial?

The trial protocol does not specify if you need to stop taking your current medications. However, if you are taking medications for inflammatory bowel disease or irritable bowel syndrome, you may not be eligible to participate.

Is surgery or medical management for diverticulitis safe?

Research suggests that non-surgical management, which includes antibiotics and supportive care, is safe for over 70% of patients with diverticulitis. For those needing surgery, minimally invasive procedures like laparoscopic colectomy have shown improved safety outcomes, especially in patients with other health issues. ^{1 2 3 4 5}

How does the treatment of surgery vs medicine for diverticulitis differ from other treatments?

This treatment is unique because it compares medical management, which often involves antibiotics and dietary changes, with surgical options like partial colectomy (removal of part of the colon), which is typically reserved for patients with a high risk of recurrence or when conservative treatments fail. The choice between these approaches depends on the severity of the condition and the patient's overall health. ^{6 7 8 9 10}

What data supports the effectiveness of this treatment for diverticulitis?

Recent studies suggest that non-surgical management, which includes medical and conservative treatments, can be as effective as surgery for many patients with uncomplicated diverticulitis. However, surgery may still be necessary for those with complicated cases or for immunocompromised patients, where medical treatment often fails. ^{7 8 11 12 13}

Who Is on the Research Team?

David R Flum, MD

Principal Investigator

University of Washington

Are You a Good Fit for This Trial?

Adults over 18 with a history of recurrent diverticulitis confirmed by CT and colonoscopy, who are currently symptom-free or have persistent symptoms for more than 3 months after an episode. Not eligible if they have right-sided diverticulitis, take certain medications for bowel diseases, had previous surgeries for diverticulitis, are pregnant or planning to become pregnant soon, or have conditions that rule out surgery.

Inclusion Criteria

I have had at least one confirmed diverticulitis episode and a colonoscopy.

I have a history of simple diverticulitis without current symptoms or ongoing issues related to diverticular disease.

Exclusion Criteria

Prior enrollment in the study or other investigational drug or vaccine while on study treatment

I do not have conditions like liver or kidney failure that prevent surgery.

I am on medication for Crohn's disease or ulcerative colitis.

Timeline for a Trial Participant

Screening

Participants are screened for eligibility to participate in the trial

2-4 weeks

Treatment

Participants are randomized to either elective segmental colectomy or best medical management

6 weeks

1 visit (in-person) for surgery, multiple visits for medical management

Follow-up

Participants are monitored for quality of life and symptoms using the GIQLI at 6, 9, and 12 months

12 months

3 visits (in-person or virtual) at 6, 9, and 12 months

What Are the Treatments Tested in This Trial?

Interventions

• Medical Management
• Partial Colectomy

Trial Overview The COSMID trial is testing whether elective colectomy (a type of surgery) is more effective than the best medical management in improving quality of life for patients with problematic diverticular disease. Patients will either undergo surgery or receive medical treatment based on random assignment.

How Is the Trial Designed?

Group I: Partial Colectomy Active Control 1 Intervention

Elective segmental colectomy for diverticular disease involves removal of the segment of colon (most commonly sigmoid and/or left colon) where there has been disease identified by computed tomography imaging or colonoscopy. Elective colectomy usually removes the affected colon along with adjacent segments that have diverticula, with a primary anastomosis performed to reestablish bowel continuity. Most surgeons now perform the procedure using a laparoscopic approach, when possible, and sometimes use a temporary, protective stoma if the re-connection is considered high-risk. The technique for laparoscopic resection is not specified by the protocol (allows for any number of laparoscopic port sites, all incision types, hand-assistance and robotic) with details of the technique recorded. If randomized to elective colectomy, patients will be encouraged to undergo the procedure within 6 weeks of assignment.

Group II: Medical Management Active Control 1 Intervention

Medical management for diverticular disease has been used for over 30 years and includes a set of interventions, all components of which have been the subject of small, but often positive trials. All patients randomized to medical management or who select it as their treatment in the observational cohort will view a video (provided in English and Spanish) that explains each element of the medical management "toolbox": diet and exercise recommendations, fiber supplementation (e.g., augmenting dietary fiber or over the counter fiber supplements), with mesalazine tablets or suppositories, probiotics and rifamycin. In consultation with their physician, they will be recommended to a regimen of diet and exercise and fiber supplementation. Clinicians will be asked to consider rifamycin (dose/frequency) for those with AUD who are not responding to diet and exercise and mesalazine (dose/frequency) for those with lingering symptoms who are not responding to diet and exercise.

Medical Management is already approved in United States, European Union for the following indications:

Approved in United States as Best Medical Management for:

• Uncomplicated Diverticulitis
• Chronic Diverticular Disease

Approved in European Union as Conservative Management for:

• Uncomplicated Diverticulitis
• Recurrent Diverticulitis
• Chronic Diverticular Disease

Who Is Running the Clinical Trial?

University of Washington

Lead Sponsor

Trials

1,858

Recruited

2,023,000+

Patient-Centered Outcomes Research Institute

Collaborator

Trials

592

Recruited

27,110,000+

Published Research Related to This Trial

In a study of 86 patients (76 nonimmunocompromised and 10 immunocompromised), medical therapy was successful in 76% of nonimmunocompromised patients, while it failed completely in immunocompromised patients, highlighting the need for a high index of suspicion for diagnosis in this group.

All immunocompromised patients required surgery for acute diverticulitis, with colostomy and resection showing fewer complications compared to colostomy and drainage, suggesting it may be the preferred surgical approach for these patients.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Acute diverticulitis. Comparison of treatment in immunocompromised and nonimmunocompromised patients. Perkins, JD., Shield, CF., Chang, FC., et al.[2019]

Diverticulitis has become a common reason for hospitalizations related to the gastrointestinal tract, with cases ranging from mild to severe, complicated forms.

Recent studies suggest that nonoperative management of diverticulitis may provide outcomes that are equal to or better than traditional aggressive surgical approaches, indicating a shift in treatment strategies.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Management of Diverticulitis in 2017. Deery, SE., Hodin, RA.[2018]

Nonoperative management is effective for treating uncomplicated right colonic diverticulitis, with a low recurrence rate of only 1% among 276 patients treated for inflamed diverticulum or phlegmon.

In contrast, patients with pericolic abscesses had a higher recurrence rate of 20%, indicating that this condition may require more careful management and possibly surgical intervention.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Nonoperative management of right colonic diverticulitis using radiologic evaluation. Park, HC., Chang, MY., Lee, BH.[2016]

Diverticulitis is a major reason for elective colonic surgeries, but there is ongoing debate about how to classify the condition and the best treatment options based on its severity.

There is a growing trend towards treating diverticular disease conservatively, even in more complicated cases, highlighting the need for clearer guidelines on surgical therapy and unanswered questions in this area.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Elective Surgery for Sigmoid Diverticulitis - Indications, Techniques, and Results. Jurowich, CF., Germer, CT.[2020]

Immunocompromised patients with diverticulitis face significantly higher risks of emergency surgery and postoperative mortality compared to immunocompetent patients, with risk ratios of 1.76 and 3.05, respectively, based on a meta-analysis of 10 studies involving nearly 2 million subjects.

Overall mortality rates are also significantly higher in immunocompromised patients with diverticulitis, indicating a need for enhanced medical treatment and a multidisciplinary approach for these patients.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Comparative outcomes of acute colonic diverticulitis in immunocompromised versus immunocompetent patients: a systematic review and meta-analysis. Lee, JG., Park, YE., Chang, JY., et al.[2023]

A study of 14,124 patients in Ontario, Canada, showed a significant decline in elective colectomy rates following nonoperative management of diverticulitis, dropping from 9.6% in 2002 to 3.9% by 2011, particularly among younger patients and those with complicated disease.

The findings suggest a shift in clinical practice towards nonoperative management of diverticulitis, aligning with evolving guidelines, as the odds of undergoing elective surgery decreased by 7% per year after adjusting for patient characteristics.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

The Decline of Elective Colectomy Following Diverticulitis: A Population-Based Analysis. Li, D., Baxter, NN., McLeod, RS., et al.[2016]

A meta-analysis of 11 studies involving 2676 patients found that observational management of uncomplicated colonic diverticulitis is as effective as antibiotic treatment, with no significant difference in the need for emergency surgery or recurrence rates.

The analysis also showed that oral antibiotics are as effective as intravenous antibiotics for treating diverticulitis, while being more cost-effective, suggesting that less aggressive treatment strategies may be viable options.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Meta-analyses of Current Strategies to Treat Uncomplicated Diverticulitis. Mege, D., Yeo, H.[2019]

In a study of 70,420 patients undergoing colectomy for diverticulitis, those with significant pre-operative respiratory comorbidities (like COPD and dyspnea) experienced significantly lower odds of mortality and morbidity when treated with laparoscopic surgery compared to open surgery.

Laparoscopic procedures also resulted in a shorter average hospital length of stay (LoS), with reductions of about 4 to 5 days compared to open surgery, highlighting its advantages for high-risk patients.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Laparoscopic colectomy for diverticulitis in patients with pre-operative respiratory comorbidity: analysis of post-operative outcomes in the United States from 2005 to 2017. Patel, R., Zagadailov, P., Merchant, AM.[2022]

Diverticulitis is increasingly diagnosed in younger patients under 50, suggesting a shift in the demographic traditionally associated with this condition, and genetic factors may play a larger role than previously understood.

Non-operative management, primarily involving antibiotics and supportive care, is effective for over 70% of patients, while surgical options like segmental colectomy are reserved for severe or recurrent cases, highlighting a more tailored approach to treatment.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Update on the management of sigmoid diverticulitis. Hanna, MH., Kaiser, AM.[2021]

In a study of 158 patients with right-sided colonic diverticulitis, 85.4% were treated conservatively with antibiotics and bowel rest, showing that this approach is both safe and effective.

The study found no significant differences in clinical outcomes or recurrence rates between patients treated conservatively and those who underwent surgery, suggesting that nonoperative treatment may be the preferred option even in complicated cases.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Treatment of right colonic diverticulitis: the role of nonoperative treatment. Kim, MR., Kye, BH., Kim, HJ., et al.[2021]

In uncomplicated diverticulitis, outpatient treatment with antibiotics is effective for immunocompetent patients, but the benefits of high-fiber diets and certain medications like mesalamine or rifaximin for acute episodes and recurrence prevention are still unclear.

For complicated diverticulitis with abscesses larger than 8 cm, surgery is necessary, and the choice between antibiotic treatment and percutaneous drainage remains controversial, highlighting the need for experienced surgical care.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Drains, Germs, or Steel: Multidisciplinary Management of Acute Colonic Diverticulitis. Lauro, A., Pozzi, E., Vaccari, S., et al.[2021]

Diverticulitis is a complex condition that requires careful medical management, particularly in challenging cases such as those involving immunocompromised patients or younger individuals.

Current recommendations for treating diverticulitis include specific antibiotic and dietary therapies, but there are potential pitfalls in diagnosis and treatment that healthcare providers must be aware of to avoid mismanagement.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Medical treatment of diverticular disease. Welling, DR.[2021]

Colonic diverticulosis is common in Western countries, especially in older adults, and is usually asymptomatic, but can lead to complications when diverticula become infected and inflamed.

Acute, uncomplicated diverticulitis can often be effectively managed with antibiotics alone, and decisions regarding surgical intervention are made based on individual patient circumstances, reflecting an evolving understanding of the disease's treatment.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Diverticulosis and acute diverticulitis. Touzios, JG., Dozois, EJ.[2022]

Citations

1. United States pubmed.ncbi.nlm.nih.gov

Acute diverticulitis. Comparison of treatment in immunocompromised and nonimmunocompromised patients. [2019]

2. United States pubmed.ncbi.nlm.nih.gov

Management of Diverticulitis in 2017. [2018]

3. England pubmed.ncbi.nlm.nih.gov

Nonoperative management of right colonic diverticulitis using radiologic evaluation. [2016]

4. Switzerland pubmed.ncbi.nlm.nih.gov

Elective Surgery for Sigmoid Diverticulitis - Indications, Techniques, and Results. [2020]

5. Korea (South) pubmed.ncbi.nlm.nih.gov

Comparative outcomes of acute colonic diverticulitis in immunocompromised versus immunocompetent patients: a systematic review and meta-analysis. [2023]

6. United States pubmed.ncbi.nlm.nih.gov

The Decline of Elective Colectomy Following Diverticulitis: A Population-Based Analysis. [2016]

7. United States pubmed.ncbi.nlm.nih.gov

Meta-analyses of Current Strategies to Treat Uncomplicated Diverticulitis. [2019]

8. Germany pubmed.ncbi.nlm.nih.gov

Laparoscopic colectomy for diverticulitis in patients with pre-operative respiratory comorbidity: analysis of post-operative outcomes in the United States from 2005 to 2017. [2022]

9. United States pubmed.ncbi.nlm.nih.gov

Update on the management of sigmoid diverticulitis. [2021]

10. Korea (South) pubmed.ncbi.nlm.nih.gov

Treatment of right colonic diverticulitis: the role of nonoperative treatment. [2021]

11. United States pubmed.ncbi.nlm.nih.gov

Drains, Germs, or Steel: Multidisciplinary Management of Acute Colonic Diverticulitis. [2021]

12. United States pubmed.ncbi.nlm.nih.gov

Medical treatment of diverticular disease. [2021]

13. United States pubmed.ncbi.nlm.nih.gov

Diverticulosis and acute diverticulitis. [2022]