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RCT of Air Insufflation Versus Water Infusion Colonoscopy

This study has been completed.
Information provided by:
East Bay Institute for Research and Education Identifier:
First received: November 3, 2008
Last updated: November 13, 2008
Last verified: November 2008
Compared with the conventional (air) method, patients examined by the study (water) method have lower pain scores and require less medication but have similar cecal intubation rate and willingness to repeat future colonoscopy.

Condition Intervention
Colorectal Cancer
Procedure: water infusion colonoscopy

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: Single Blind (Participant)
Primary Purpose: Screening
Official Title: A Randomized Controlled Comparison of Warm Water Infusion in Lieu of Air Insufflation vs. Air Insufflation for Aiding Colonoscopy Insertion in Sedated Patients Undergoing Colorectal Cancer (CRC) Screening and Surveillance.

Resource links provided by NLM:

Further study details as provided by East Bay Institute for Research and Education:

Primary Outcome Measures:
  • Increments of medications used for sedation [ Time Frame: duration of procedure ]

Secondary Outcome Measures:
  • pain scores during colonoscopy [ Time Frame: duration of procedure ]
  • success with cecal intubation [ Time Frame: during procedure ]
  • willingness to repeat colonoscopy [ Time Frame: after procedure ]

Enrollment: 56
Study Start Date: March 2008
Study Completion Date: October 2008
Primary Completion Date: September 2008 (Final data collection date for primary outcome measure)
Intervention Details:
    Procedure: water infusion colonoscopy
    water infusion in lieu of air insufflation for screening colonoscopy
    Other Name: optical colonoscopy, water infusion colonoscopy
Detailed Description:

Background: A novel water method permitted 52% of patients accepting on-demand sedation to complete colonoscopy without medications and significantly increased successful cecal intubation from 76% to 97% in patients accepting scheduled unsedated colonoscopy.

Aim: To perform a randomized controlled trial comparing air insufflation (conventional method) vs. water infusion in lieu of air (study method) colonoscopy in minimally sedated patients.

Hypothesis: Compared with the conventional method, patients examined by the study method have lower pain scores and require less medication but have similar cecal intubation rate and willingness to repeat future colonoscopy.

Setting: Outpatient colonoscopy in a single VA hospital Methods: After informed consent and standard bowel preparation, patients received pre-medications administered as 0.5 increment of Fentanyl (25 μg) and 0.5 increment of Versed (1 mg) plus 50 mg Diphenhydramine. The conventional and the study method for colonoscopy were implemented as previously described. Additional pain medications were administered at the patients' request.

Outcome measures: Increments of medications, pain scores, cecal intubation and willingness to repeat colonoscopy.

Limitations: Single VA site, older male population


Ages Eligible for Study:   45 Years to 75 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • healthy individual 50 years or older
  • eligible for colorectal cancer screening or surveillance

Exclusion Criteria:

  • patients who do not understand or failed to sign informed consent
  Contacts and Locations
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Please refer to this study by its identifier: NCT00785889

United States, California
Sacramento VA Medical Center, VANCHCS
Mather, California, United States, 95655
Sponsors and Collaborators
East Bay Institute for Research and Education
Principal Investigator: Joseph Leung, MD Sacramento VA Medical Center, GI Section
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Joseph Leung, M.D., GI Section, Northern California Health Care System Identifier: NCT00785889     History of Changes
Other Study ID Numbers: EBIRE-GI-001
Study First Received: November 3, 2008
Last Updated: November 13, 2008

Keywords provided by East Bay Institute for Research and Education:
Colorectal cancer screening
optical colonoscopy
water method

Additional relevant MeSH terms:
Colorectal Neoplasms
Intestinal Neoplasms
Gastrointestinal Neoplasms
Digestive System Neoplasms
Neoplasms by Site
Digestive System Diseases
Gastrointestinal Diseases
Colonic Diseases
Intestinal Diseases
Rectal Diseases processed this record on April 28, 2017