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Impact of Experience on Results With the Third Eye Retroscope

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: NCT00969124
Recruitment Status : Completed
First Posted : September 1, 2009
Results First Posted : July 26, 2017
Last Update Posted : July 26, 2017
Information provided by (Responsible Party):
Avantis Medical Systems

Brief Summary:

The Third Eye Retroscope is a device that can be used with a colonoscope to improve the ability of a physician to see areas of the colon that may be hidden from the view of the colonoscope.

Previous studies have shown that physicians are able to detect additional polyps when they use the device along with the colonoscope. The purpose of this study is to determine whether physicians can detect greater numbers of additional polyps as they gain in experience with the device.

Condition or disease Intervention/treatment Phase
Colorectal Neoplasms Device: Third Eye Retroscope Not Applicable

Detailed Description:

Purpose: This study is intended to determine characteristics of the "learning curve" for use of the Third Eye Retroscope during colonoscopy, both in terms of efficacy for detection of abnormalities in the colon and time-efficiency for endoscopists

Device Description: The Third Eye Retroscope is an auxiliary imaging device that is designed to allow visualization of "hidden areas" during colonoscopy by providing an additional, retrograde view that complements the forward view of the colonoscope.

After a standard colonoscope has been advanced to the cecum, the Third Eye Retroscope is inserted through the instrument channel of the colonoscope. As it emerges from the distal tip of the colonoscope, the Third Eye Retroscope automatically bends 180 degrees to form a "J" shape. Its sensor then provides a continuous retrograde view of the colon throughout the process of withdrawal of the colonoscope.

The retrograde view assists the endoscopist in visualizing the proximal aspect of haustral folds and rectal valves, as well as the areas behind flexures and the ileocecal valve. With this additional point-of-view, the endoscopist may be able to detect lesions that can be missed by the forward-viewing colonoscope.

Study Design: Patients who are scheduled for colonoscopy will be recruited to the study and examined with the Third Eye Retroscope in conjunction with a standard colonoscope. For each polyp that is found, the endoscopist will indicate whether it could be seen with the colonoscope, or if it could be found with the colonoscope only because it was first detected with the Third Eye.

Each investigator will perform colonoscopies on 20 patients, who will be segmented into four quartiles according to the order of their procedures. Mean results for the quartiles will be compared in order to evaluate the learning curve for Third Eye colonoscopy.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 328 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Masking Description: Open Label
Primary Purpose: Diagnostic
Official Title: Impact of Experience With the Third Eye Retroscope on Detection Rates and Withdrawal Times During Colonoscopy
Study Start Date : January 2009
Actual Primary Completion Date : October 2009
Actual Study Completion Date : October 2009

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Colonoscopy

Arm Intervention/treatment
Experimental: Third Eye Retroscope
All subjects underwent the same intervention, consisting of examination of the colon using a colonoscope along with the Third Eye Retroscope device, with removal of any polyps that were detected during the procedure.
Device: Third Eye Retroscope
Third Eye Retroscope is used in conjunction with a standard colonoscope while performing colonoscopy

Primary Outcome Measures :
  1. Detection Rates for Adenomas [ Time Frame: During the colonoscopy procedure (up to 1 hour, average 25 minutes) ]
    Adenomas detected with the colonoscope alone vs. with the Retroscope

  2. Detection Rates for All Polyps [ Time Frame: During the colonoscopy procedure (up to 1 hour, average 25 minutes) ]
    All polyps detected with the colonoscope alone vs. with the Retroscope

Secondary Outcome Measures :
  1. Time Spent During Withdrawal Phase and Total Procedure [ Time Frame: During the colonoscopy procedure (up to 1 hour, average 25 minutes) ]
    Time in minutes for withdrawal phase of procedure and for total procedure

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. The patient is undergoing colonoscopy for screening, for surveillance in follow-up of previous polypectomy or for diagnostic workup;
  2. The patient must understand and provide written consent for the procedure.

Exclusion Criteria:

  1. Patients with a history of colonic resection;
  2. Patients with inflammatory bowel disease;
  3. Patients with a personal history of polyposis syndrome;
  4. Patients with suspected chronic stricture potentially precluding complete colonoscopy;
  5. Patients with diverticulitis or toxic megacolon;
  6. Patients with a history of radiation therapy to abdomen or pelvis.
  7. Patients who are currently enrolled in another clinical investigation in which the intervention might compromise the safety of the patient's participation in this study.

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): NCT00969124

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United States, Florida
Florida Hospital
Celebration, Florida, United States, 34747
United States, Illinois
University of Chicago
Chicago, Illinois, United States, 60637
NorthShore University HealthSystem
Evanston, Illinois, United States, 60201
United States, Massachusetts
University of Massachusetts
Worcester, Massachusetts, United States, 01655
United States, Minnesota
Hennepin County Medical Center
Minneapolis, Minnesota, United States, 55415
United States, Texas
Parkland Hospital
Dallas, Texas, United States, 75235
Baylor University Medical Center
Dallas, Texas, United States, 75246
S.W. Fort Worth Endoscopy Center
Fort Worth, Texas, United States, 76132
North Hills Hospital
North Richland Hills, Texas, United States, 76180
Sponsors and Collaborators
Avantis Medical Systems
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Principal Investigator: Daniel C DeMarco, MD Baylor Health Care System

Publications of Results:
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Responsible Party: Avantis Medical Systems Identifier: NCT00969124     History of Changes
Other Study ID Numbers: Avantis TER 08-07
First Posted: September 1, 2009    Key Record Dates
Results First Posted: July 26, 2017
Last Update Posted: July 26, 2017
Last Verified: June 2017
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Avantis Medical Systems:
miss rates
Additional relevant MeSH terms:
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Colorectal Neoplasms
Intestinal Neoplasms
Gastrointestinal Neoplasms
Digestive System Neoplasms
Neoplasms by Site
Digestive System Diseases
Gastrointestinal Diseases
Colonic Diseases
Intestinal Diseases
Rectal Diseases