Comparison of Methods to Distend the Colon During Insertion: CO2, Air Insufflation, Water-aided Colonoscopy

Study Overview
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Brief Summary
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Insufflation of the colon, usually with room air, is necessary to distend the lumen for exploration. Carbon dioxide (CO2) insufflation instead of room air insufflation (AI) has been shown to decrease symptoms of abdominal pain or discomfort during the procedure and particularly during the following 24 hours. CO2 is is rapidly absorbed by the intestinal mucosa and exhaled through respiration. AI colonoscopy has usually been the reference standard to compare colonoscopy using CO2 insufflation. In two recent articles AI was compared to either CO2 insufflation and Water-aided colonoscopy (WAC), which entails infusion of water to facilitate insertion to the cecum. WAC can be categorized broadly in Water Immersion (WI) and Water Exchange (WE). In WI water is infused during the insertion phase of colonoscopy, with removal of infused water predominantly during withdrawal. Occasional use of insufflation may be allowed. WE entails complete exclusion of insufflation, removal of residual colonic air pockets and feces, and suction of infused water predominantly during insertion to minimize distention. During the withdrawal phase insufflation is used to distend the colonic lumen. In the WAC arms of the two mentioned articles the insertion method used was WI, with infusion of water at room temperature or at 37°C. During withdrawal, air insufflation or either air or CO2 insufflation were employed. Compared to AI, CO2 insufflation and WI (using room air insufflation or CO2 insufflation during withdrawal) were effective in both studies in decreasing sedation requirement, pain and tolerance scores, with patients' higher willingness to repeat the procedure. Until now no direct comparison has been made within a single study about pain score during colonoscopy using AI, CO2 insufflation, WI/CO2, WE/CO2, WI/AI and WE/AI. In this study we test the hypothesis that, compared to AI, CO2 insufflation and WAC/CO2-AI methods will decrease pain score during colonoscopy, with reduction of sedation requirement, and that WE will achieve the best result. This comparative study has also the aim to test the respective peculiarities of each method.

Detailed Description
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Design: Prospective double blinded two-center randomized controlled trial. Methods: Colonoscopy with air insufflation, CO2, Water Immersion/CO2, Water Exchange/CO2, Water Immersion/AI and Water Exchange/AI to aid insertion of colonoscope; split dose bowel preparation; on demand-sedation. Control method: Air insufflation colonoscopy. Study methods: CO2 colonoscopy, Water Immersion/CO2 colonoscopy, Water Exchange/CO2 colonoscopy, Water Immersion/AI colonoscopy, Water Exchange/AI colonoscopy. Population: Consecutive 18 to 85 year-old diagnostic in-patients and outpatients. After informed consent, assignment to control or study arms based on computer generated randomization list with block allocation and stratification. Primary outcome: Maximum pain score recorded during colonoscopy. Secondary outcomes: Cecal intubation rate and time, total procedure time (including biopsy and/or polypectomy), need for sedation and its dosage, overall pain score at discharge. In addition, Adenoma Detection Rate, Mean Adenomas per Procedure, position changes, amount of infused and suctioned water during insertion and withdrawal will be recorded. Bloating after examination and at discharge and patient willingness to repeat the examination will be evaluated.

Official Title
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Comparison of Methods for Luminal Distention for on Demand Sedation Colonoscopy: Air Insufflation, Carbon Dioxide and Water-aided Colonoscopy. A Randomized Controlled Trial.

Conditions
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Pain, Colorectal Adenomas, Colorectal Cancer

Intervention / Treatment
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* Other: Air Insufflation method.
* Other: CO2 insufflation
* Other: Water Immersion/CO2
* Other: Water Exchange/CO2
* Other: Water Immersion/AI
* Other: Water Exchange/AI


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Consecutive 18 to 85 year-old diagnostic in-patients and outpatients agreeing to start procedure without premedication. Exclusion Criteria: Patient unwillingness to start the procedure without sedation/analgesia previous colorectal surgery proctosigmoidoscopy or bidirectional endoscopy patient refusal or inability to provide informed consent inadequate assumption of bowel preparation moderate or severe chronic obstructive pulmonary disease requiring oxygen medical history of CO2 retention

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 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: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Air insufflation method.<br>Colonoscopy performed in the standard fashion, with the minimal air insufflation required to aid insertion and allowing for washing as needed. Considered to be standard procedure. | Other: Air Insufflation method.<br>* Air Insufflation method.<br>|
| Experimental: CO2 insufflation<br>Colonoscopy performed with CO2 insufflation using the insufflation unit, allowing for washing as needed. | Other: CO2 insufflation<br>* CO2 insufflation.<br>|
| Experimental: Water Immersion/CO2<br>Infusion of water during the insertion phase of colonoscopy mainly to open the colonic lumen and progress to the cecum immersed in the water environment thus created, without attempting to clear the colon contents. Residual air in the colon will not be removed. Infused water and residual feces will be suctioned back predominantly during withdrawal. Insufflation not used until the cecum is reached. It will be allowed only 3 times and no more than 10 seconds each time (ITT failure if >3) if the lumen cannot be seen. Withdrawal phase done using CO2 insufflation. | Other: Water Immersion/CO2<br>* Water Immersion during insertion, CO2 insufflation during withdrawal.<br>|
| Experimental: Water Exchange/CO2<br>Insufflation not used until the cecum is reached. Infusion of a sufficient amount of water to render the lumen of the colon a slit to progress with the colonoscope. Part of the infused water will be constantly suctioned back exchanging clean for dirty or hazy water. Air pockets will be always aspirated to collapse the lumen. After cecal intubation as much residual water as possible will be aspirated before beginning the withdrawal phase. During withdrawal residual water and feces will be suctioned. Withdrawal phase done using CO2 insufflation. | Other: Water Exchange/CO2<br>* Water Exchange during insertion, CO2 insufflation during withdrawal.<br>|
| Experimental: Water Immersion/AI<br>Infusion of water during the insertion phase of colonoscopy mainly to open the colonic lumen and progress to the cecum immersed in the water environment thus created, without attempting to clear the colon contents. Residual air in the colon will not be removed. Infused water and residual feces will be suctioned back predominantly during withdrawal. Insufflation not used until the cecum is reached. It will be allowed only 3 times and no more than 10 seconds each time (ITT failure if >3) if the lumen cannot be seen. Withdrawal phase done using room air insufflation. | Other: Water Immersion/AI<br>* Water Immersion during insertion, AI insufflation during withdrawal.<br>|
| Experimental: Water Exchange/AI<br>Insufflation not used until the cecum is reached. Infusion of a sufficient amount of water to render the lumen of the colon a slit to progress with the colonoscope. Part of the infused water will be constantly suctioned back exchanging clean for dirty or hazy water. Air pockets will be always aspirated to collapse the lumen. After cecal intubation as much residual water as possible will be aspirated before beginning the withdrawal phase. During withdrawal residual water and feces will be suctioned. Withdrawal phase done using room air insufflation. | Other: Water Exchange/AI<br>* Water Exchange during insertion, AI insufflation during withdrawal.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum pain score recorded during colonoscopy. | Pain assessed using a visual analogue scale (VAS) with a score 0=absence of pain, 2=simply discomfort, 10=the worst possible pain. Before the procedure, an endoscopic nurse will explain the VAS scoring system to the patients. Every 60 seconds during colonoscopy patients will be asked about discomfort or pain. The responses will be recorded, and the maximum pain score noted. | 1 hour | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall pain after the procedure. | After the procedure and at discharge from the Endoscopy Unit, an assistant nurse blinded to the procedure will ask patients about overall pain using the same VAS when neither the endoscopist nor the assistant nurse who performed the colonoscopy will be present. Patients will be asked to quantify the degree of pain experienced and to place a mark over the VAS accordingly. | 1 hour. | 
| Cecal intubation rate. | Cecal intubation will be defined as passage of the tip of the colonoscope beyond the ileocecal valve so that the medial wall of the cecum proximal to the ileocecal valve will be observed. | 1 hour | 
| Cecal intubation time. | Cecal intubation time will be defined as the time for passage of the colonoscope from the rectum to the cecum. | 1 hour. | 
| Total procedure time. | Total procedure time (including time required for polyp resection or biopsy). | 1 hour. | 
| Adenoma detection rate. | Proportion of subjects with at least one adenoma of any size. | 15 months. | 
| Mean adenomas per procedure. | Total number of adenomas resected per subject. | 15 months. | 
| Advanced adenomas. | Total number of advanced adenomas: diameter ≥10mm, or high grade dysplasia, or with ≥20% villous components. | 15 months. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Water-aided colonoscopy, Water Immersion colonoscopy, Water Exchange colonoscopy, Carbon-dioxide colonoscopy, Painless unsedated colonoscopy, Adenoma detection rate, Mean Adenomas per Procedure