Colonoscopy (Procedure)NCT07772648
Supine Starting Position Shortens Cecal Intubation Time But Reduces Endoscopist Comfort: a Prospective Comparative Study of Colonoscopy Positioning Strategies
A study testing Colonoscopy Starting Position in people with Colonoscopy (Procedure), run by Sisli Hamidiye Etfal Training and Research Hospital at 1 site in Turkey (Türkiye).
Trial summary
The main questions it aims to answer are: Does starting colonoscopy in the supine position compared with the left lateral position affect the time required to reach the cecum? Does the starting position affect endoscopist comfort, patient comfort, procedure duration, polyp and adenoma detection, or the need to change… Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Colonoscopy (Procedure)
- What is being tested?
- Colonoscopy Starting Position
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 158 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 1 Mar 2025to 5 Dec 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Adults aged 18 years or older. Scheduled to undergo screening colonoscopy. No history of colorectal cancer. No history of colorectal surgery.
Who cannot join
- Failure to achieve cecal intubation. Inflammatory bowel disease. Inadequate bowel preparation, defined as a Boston Bowel Preparation Scale (BBPS) score <2.
Trial locations and contacts
1 site in 1 country.
Turkey (Türkiye)1 site
Şişli Hamidiye Etfal Training and Research Hospital
Istanbul, Istanbul, 34371
About this study
Official title: The Effect of Colonoscopy Starting Position on Procedural Efficiency
The main questions it aims to answer are:
Does starting colonoscopy in the supine position compared with the left lateral position affect the time required to reach the cecum? Does the starting position affect endoscopist comfort, patient comfort, procedure duration, polyp and adenoma detection, or the need to change the patient's position during the procedure?
Participants will be randomly assigned to undergo colonoscopy starting either in the supine position or in the left lateral position. The colonoscopy will otherwise be performed according to standard clinical practice.
Read the detailed description
Colonoscopy is widely used for the diagnosis, screening, and surveillance of colorectal diseases. The left lateral position is conventionally used as the initial patient position during colonoscopy; however, alternative starting positions may influence colonoscope advancement, procedure efficiency, and the comfort of both the patient and the endoscopist.
This single-center, randomized controlled trial was designed to evaluate the effect of the starting position on colonoscopy efficiency. Adult participants undergoing elective colonoscopy were randomly assigned in a 1:1 ratio to begin the procedure either in the supine position or in the left lateral position.
The primary focus of the study was endoscopist comfort during the procedure. Additional assessments included patient comfort, cecal intubation time, withdrawal time, adenoma and polyp detection, the need for patient repositioning during colonoscopy, and procedure-related complications.
The study aimed to determine whether the supine starting position provides advantages over the conventional left lateral starting position and whether the initial patient position may represent a simple and readily applicable factor for improving colonoscopy efficiency.
- Conditions
- Colonoscopy (Procedure)
- Being tested
- Colonoscopy Starting Position
- Keywords
- Endoscopist ergonomics, Cecal intubation time, Patient positioning
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Colonoscopy Starting PositionProcedure or surgery
Participants were assigned to undergo colonoscopy starting either in the supine position or in the left lateral position according to randomization. The assigned position was used at the beginning of the procedure. Patient repositioning during colonoscopy was permitted when clinically required to facilitate colonoscope advancement or completion of the procedure.
| Study group | Role | What they receive |
|---|---|---|
| Supine Position | Experimental | Participants assigned to this arm underwent colonoscopy starting in the supine position. Receives: Procedure: Colonoscopy Starting Position |
| Left Lateral Position | Active comparator | Participants assigned to this arm underwent colonoscopy starting in the left lateral position Receives: Procedure: Colonoscopy Starting Position |
What is being measured
The primary outcome is the main question the study is designed to answer.
Endoscopist Comfort Score (ECS)
Endoscopist comfort was assessed using a 100-mm visual analog scale (VAS), converted to a 0-10 numeric score, with higher scores indicating greater comfort.
Measured: Immediately after completion of the colonoscopy
Patient Comfort Score (PCS)
Patient comfort was assessed using a 100-mm visual analog scale (VAS), converted to a 0-10 numeric score, with higher scores indicating greater comfort.
Measured: After recovery from anesthesia on the day of the colonoscopy
Secondary outcomes (7)
Cecal Intubation Time (CIT)
Cecal intubation time was defined as the time from insertion of the colonoscope at the anal verge to visualization of characteristic cecal landmarks, such as the appendiceal orifice or ileocecal valve. Time was measured using a chronometer and recorded in minutes.
Measured: During the colonoscopy, from colonoscope insertion to cecal intubation
Withdrawal Time (WT)
Withdrawal time was defined as the time from the start of colonoscope withdrawal at the cecum to withdrawal of the colonoscope at the rectum. The durations of polypectomy and other therapeutic interventions performed during withdrawal were included in the withdrawal time. Time was measured using a chronometer and recorded in minutes.
Measured: During the colonoscopy
Adenoma Detection Rate (ADR)
Adenoma detection rate was defined as the percentage of participants in whom at least one histologically confirmed adenoma was detected during colonoscopy. Histological confirmation was based on pathology reports.
Measured: Up to 30 days after colonoscopy
Polyp Detection Rate (PDR)
Polyp detection rate was defined as the percentage of participants in whom at least one polyp was detected during colonoscopy.
Measured: During the colonoscopy
Requirement for Patient Repositioning
Patient repositioning was defined as the requirement for an assisted transition from the assigned initial starting position to a different patient position during colonoscopy. The outcome was recorded as whether repositioning was required or not required.
Measured: During the colonoscopy
Requirement for Abdominal Compression
Abdominal compression was defined as the requirement for manual pressure applied to the abdominal wall to facilitate advancement of the colonoscope. The outcome was recorded as whether abdominal compression was required or not required.
Measured: During the colonoscopy
Procedure-Related Complications
Procedure-related complications included perforation, clinically significant bleeding or abdominal pain requiring hospitalization, and hypoxemia or hypotension requiring hospitalization. The outcome was assessed as the proportion of participants experiencing at least one of these complications.
Measured: During and after the colonoscopy on the day of the procedure
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted19 Aug 2026
- Study start1 Mar 2025
- Primary completion31 Mar 2025
- Study completion5 Dec 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Colonoscopy (Procedure)Studies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 158 participants (actual)
Sponsor and investigators
- Lead sponsor
- Sisli Hamidiye Etfal Training and Research Hospital
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Elif Tufan, Sisli Hamidiye Etfal Training and Research Hospital
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07772648
- Sponsor's protocol ID
- IRB No: 2024/4599
- Status last verified
- Nov 2024
- First submitted
- 13 Aug 2026
- Last updated
- 19 Aug 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: There is no current plan to share individual participant data (IPD).
Study at a glance
From the registry record, last updated by the sponsor on 19 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The Effect of Colonoscopy Starting Position on Procedural Efficiency
- ClinicalTrials.gov ID
- NCT07772648
- Acronym / sponsor ID
- IRB No: 2024/4599
- Conditions
- Colonoscopy (Procedure)
- Keywords
- Endoscopist ergonomics, Cecal intubation time, Patient positioning
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 158 participants (actual)
- Lead sponsor
- Sisli Hamidiye Etfal Training and Research HospitalUniversity, hospital or other
- Study start
- 1 Mar 2025 (actual)
- Primary completion
- 31 Mar 2025 (actual)
- Study completion
- 5 Dec 2025 (actual)
- First posted
- 19 Aug 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The main questions it aims to answer are:
Does starting colonoscopy in the supine position compared with the left lateral position affect the time required to reach the cecum? Does the starting position affect endoscopist comfort, patient comfort, procedure duration, polyp and adenoma detection, or the need to change the patient's position during the procedure?
Participants will be randomly assigned to undergo colonoscopy starting either in the supine position or in the left lateral position. The colonoscopy will otherwise be performed according to standard clinical practice.
Detailed description
Colonoscopy is widely used for the diagnosis, screening, and surveillance of colorectal diseases. The left lateral position is conventionally used as the initial patient position during colonoscopy; however, alternative starting positions may influence colonoscope advancement, procedure efficiency, and the comfort of both the patient and the endoscopist.
This single-center, randomized controlled trial was designed to evaluate the effect of the starting position on colonoscopy efficiency. Adult participants undergoing elective colonoscopy were randomly assigned in a 1:1 ratio to begin the procedure either in the supine position or in the left lateral position.
The primary focus of the study was endoscopist comfort during the procedure. Additional assessments included patient comfort, cecal intubation time, withdrawal time, adenoma and polyp detection, the need for patient repositioning during colonoscopy, and procedure-related complications.
The study aimed to determine whether the supine starting position provides advantages over the conventional left lateral starting position and whether the initial patient position may represent a simple and readily applicable factor for improving colonoscopy efficiency.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Supine Position | Experimental | Procedure: Colonoscopy Starting PositionParticipants assigned to this arm underwent colonoscopy starting in the supine position. |
| Left Lateral Position | Active comparator | Procedure: Colonoscopy Starting PositionParticipants assigned to this arm underwent colonoscopy starting in the left lateral position |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- Adults aged 18 years or older. Scheduled to undergo screening colonoscopy. No history of colorectal cancer. No history of colorectal surgery.
Key exclusion criteria (1 listed)
- Failure to achieve cecal intubation. Inflammatory bowel disease. Inadequate bowel preparation, defined as a Boston Bowel Preparation Scale (BBPS) score <2.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Colonoscopy Starting PositionParticipants were assigned to undergo colonoscopy starting either in the supine position or in the left lateral position according to randomization. The assigned position was used at the beginning of the procedure. Patient repositioning during colonoscopy was permitted when clinically required to facilitate colonoscope advancement or completion of the procedure. | Procedure or surgery | Left Lateral Position, Supine Position |
Primary outcome
Endoscopist Comfort Score (ECS)
Time frame: Immediately after completion of the colonoscopy
Endoscopist comfort was assessed using a 100-mm visual analog scale (VAS), converted to a 0-10 numeric score, with higher scores indicating greater comfort.
Patient Comfort Score (PCS)
Time frame: After recovery from anesthesia on the day of the colonoscopy
Patient comfort was assessed using a 100-mm visual analog scale (VAS), converted to a 0-10 numeric score, with higher scores indicating greater comfort.
7 secondary outcomes
Cecal Intubation Time (CIT)
Time frame: During the colonoscopy, from colonoscope insertion to cecal intubation
Withdrawal Time (WT)
Time frame: During the colonoscopy
Adenoma Detection Rate (ADR)
Time frame: Up to 30 days after colonoscopy
Polyp Detection Rate (PDR)
Time frame: During the colonoscopy
Requirement for Patient Repositioning
Time frame: During the colonoscopy
Requirement for Abdominal Compression
Time frame: During the colonoscopy
Procedure-Related Complications
Time frame: During and after the colonoscopy on the day of the procedure
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 19 Aug 2026.
- Individual participant dataSharing planned: No. There is no current plan to share individual participant data (IPD).
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Colonoscopy Starting Position in people with Colonoscopy (Procedure), run by Sisli Hamidiye Etfal Training and Research Hospital at 1 site in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 19 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Endoscopist Comfort Score (ECS) (time frame: Immediately after completion of the colonoscopy). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Aug 2026.