Morning-Only 4 L PEG vs Split Dose Prep for Afternoon Colonoscopies, Endoscopist-Blinded Prospective Study

Study Overview
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Brief Summary
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Comparison of quality of preparation of colonoscopy in patients taking same day 4L preparation vs. 4 L split dose preparation in patients scheduled for an afternoon colonoscopy procedure.

Detailed Description
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The aim of colorectal cancer screening is to reduce mortality. This can be effectively achieved by colonoscopy with direct visualization of the entire colon to detect preneoplastic lesions such as adenomatous polyps. Bowel preparation quality is critical for the accuracy of colonoscopy, time required to complete the procedure and its success. On the other hand, poor quality of bowel preparation was shown to be associated with a lower adenoma detection rate. Prior studies have shown that time of colonoscopy is one of the major factors influencing bowel preparation quality with the afternoon colonoscopies being notable for a high failure rate. This failure rate is related to poor bowel preparation quality. Given that, the number of afternoon colonoscopies performed is still high due to the increased need for colonoscopies. Therefore, it is suggested that improving the bowel preparation quality can reduce failure rate of afternoon colonoscopies. Several studies on split-dose bowel preparation have shown that it is superior to the conventional day-before regimen, in terms of preparation quality and patient's tolerability. Another study on split-dose bowel preparation also showed that it is associated with a better adenoma detection rate, better polyp detection rate and colonoscopy completion rate. There also have been few studies comparing same day dose vs. day-before for afternoon colonoscopies and showed that same day was superior to day before.There is no data comparing quality of preparation of colonoscopy in patients taking same day 4L preparation vs. 4 L split-dose preparation for an afternoon colonoscopy. Using a 4L PEG-ELS solution, the investigators aim to evaluate the efficacy and patient's tolerability for the same day versus split-dose regimen.

Official Title
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Morning-Only 4 Liter Polyethylene Glycol vs. Split Dose for Afternoon Colonoscopies, a Randomized Endoscopist-Blinded Prospective Study

Conditions
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Colonoscopy

Intervention / Treatment
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* Drug: Same day 4 L preparation (Polyethylene Glycol)
* Drug: Split dose 4 L preparation (Polyethylene Glycol)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 1. All patients above 18 years of age undergoing elective outpatient colonoscopy at CCF Florida who are scheduled for an afternoon colonoscopy procedure. All patients must have been prescribed a 4 L PEG based bowel preparation. Exclusion Criteria: Patients who had prior Colectomy or colon resection surgery. Patients with confirmed diagnosis of impaired GI motility. Chronic nausea or vomiting. Severe constipation (=/<1 bowel movement per week). Pregnancy. Breast feeding. Patients taking drugs which are known to influence GI motility. Hospital inpatients.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Same day 4 L preparation of PEG<br>Receive 1 gallon (4 L) of Polyethylene Glycol (PEG) preparation on the morning of the colonoscopy. | Drug: Same day 4 L preparation (Polyethylene Glycol)<br>* Receive 1 gallon (4 L) of Polyethylene Glycol preparation on the morning of the colonoscopy.<br>* Other names: PEG bowel prep;|
| Active Comparator: Split dose 4 L preparation of of the PEG<br>Receive the split-dose regimen. Will take half (2 L) of the PEG preparation the evening before colonoscopy and half (2 L) of the PEG preparation on the morning of the procedure. | Drug: Split dose 4 L preparation (Polyethylene Glycol)<br>* Receive the split-dose regimen. Will take half (2 L) the preparation the evening before colonoscopy and half (2 L) on the morning of the procedure.<br>* Other names: PEG bowel prep;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Quality of preparation (Ottawa score) | The quality of bowel preparation will be assessed for the 2 groups at the time of the colonoscopy using the Ottawa score for quality of preparation. | During the colonoscopy | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Patient satisfaction with the bowel preparation (questionnaire). | Patient satisfaction with the bowel preparation in the 2 groups will be assessed using an approved questionnaire at the time of pre-operative assessment of the patient. | Before the colonoscopy procedure. |