Outpatient Treatment of Uncomplicated Diverticulitis With Either Antibiotic or Nonantibiotic Treatment

Study Overview
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Brief Summary
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Uncomplicated sigmoid diverticulitis is a common disease in Western countries. Traditional management includes inpatient administration of either oral or intravenous antibiotics with resumption of oral intake as symptoms improve. Recent literature has however questioned both inpatient and antibiotic treatment. Indeed, both inpatient and antibiotic treatment are associated with non-negligible risks to patients. The aim of this trial is to assess the feasibility of a randomized controlled trial designed to determine whether nonantibiotic treatment of uncomplicated diverticulitis is safe in the outpatient setting.

Detailed Description
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Uncomplicated sigmoid diverticulitis is a common disease in Western countries. Traditional management includes inpatient administration of either oral or intravenous antibiotics with resumption of oral intake as symptoms improve. Recent literature has however questioned both inpatient and antibiotic treatment. Indeed, both inpatient and antibiotic treatment are associated with non-negligible risks to patients. The aim of this trial is to assess the feasibility of a randomized controlled trial designed to determine whether nonantibiotic treatment of uncomplicated diverticulitis is safe in the outpatient setting. It is designed as a pilot non-inferiority blinded randomized controlled trial. The estimated length of this pilot trial is 1 year. The target population is capable adults of who have a CT-diagnosed episode of uncomplicated diverticulitis who present to the Jewish General Hospital Emergency room.

Official Title
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Study on Outpatient Treatment of Uncomplicated Diverticulitis With Either Antibiotic or Nonantibiotic Treatment: a Randomized Pilot Trial

Conditions
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Uncomplicated Diverticular Disease

Intervention / Treatment
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* Other: Nonantibiotic treatment of uncomplicated diverticulitis
* Other: Antibiotic treatment of uncomplicated diverticulitis


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age ≥ 18 and < 90 years old Capable of giving informed consent Lower abdominal pain and/or tenderness Confirmed affection of left colon, including descending and sigmoid colon Confirmed episode of acute uncomplicated diverticulitis on computed tomography (CT) scan defined as wall edema with or without fat stranding. Limited pericolic air with bubbles less than 5 mm in size, and less than 5cm from the colon wall, will be included as uncomplicated diverticulitis. Scan must be performed prior to enrollment and assessment for illegibility. The initial scan is not a study-specific procedure. Exclusion Criteria: CT scan shows complicated diverticulitis as defined by the presence of intraperitoneal free perforation (i.e. intraperitoneal contrast extravasation if intra-rectal contrast given, free air under diaphragms, disseminated intraperitoneal air), abscess, obstruction, fistulisation, and phlegmon. Suspicion of colorectal cancer on CT scan Immunosuppression (including but not exclusively insulin-dependent diabetes mellitus, chronic liver disease, ongoing chemotherapy, chronic renal failure with hemodialysis, corticosteroid and immunosuppressive medication) Pregnancy and breastfeeding Any comorbid infection requiring High fever (≥ 38.5 ºC) Significant leukocytosis (> 15 g/dL) Abdominal pain worsening in the emergency, impeding ambulation and/or eating Evidence of generalized peritonitis on physical exam Intolerance to oral intake and/or persistent vomiting Marked abdominal distension and/or signs of ileus on CT scan Noncompliance/unreliability for return visits/lack of support system Failed outpatient treatment not previously included in study within last 30 days Cognitive, social or psychiatric impairment For patients aged 65 years or older, a Charlson Comorbidity Score ≥ 5 as calculated on the following website: https://www.thecalculator.co/health/Charlson-Comorbidity-Index-(CCI)-Calculator-765.html 19-20.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 90 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Outpatient nonantibiotic treatment<br> | Other: Nonantibiotic treatment of uncomplicated diverticulitis<br>* Patients randomized to this arm will be treated without antibiotics in the outpatient setting. Pain will be managed with appropriate analgesia as per protocol.<br>|
| Active Comparator: Outpatient antibiotic treatment<br> | Other: Antibiotic treatment of uncomplicated diverticulitis<br>* Patients randomized to this arm will be treated with antibiotics in the outpatient setting. Pain will be managed with appropriate analgesia as per protocol.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Participants' retention rate as assessed by the number of participants retained in the study from screening to the end of follow-up. | The primary outcome pertains to the feasibility of a non-inferiority randomized controlled trial. The study group's main concern is that accrual will be impeded by the important change in clinical management that nonantibiotic treatment of uncomplicated diverticulitis requires. Also, the study group is concerned that patients may be lost to follow-up. For these reasons, the primary outcome is the retention rate of patients from screening to the end of follow-up. The rate will be calculated according to (1) the proportion of participants screened but not randomized, and (2) the proportion of participants lost to follow-up. | 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Treatment failure | Treatment failure is defined as persistence, increase or recurrence of abdominal pain and/or fever, inflammatory bowel obstruction, need for radiological abscess drainage or immediate surgery due to complicated diverticulitis, need for hospital admission, and mortality during the first 60 days after discharge. | 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Antibiotics