Neck Circumference, Difficulty of Tracheal IntubationNCT01191658
Can Neck Circumference Measurements Less Than 43cm or Greater Than 43cm Predict Difficulty of Tracheal Intubation?
An observational study of Neck Circumference, Difficulty of Tracheal Intubation, run by CAMC Health System at 1 site in United States.
Trial summary
The circumference of a person's neck is a useful predictor of difficulty of insertion of a breathing tube. Read more about this study
- Who is it for?
- Ages 18 to 80 yearsHealthy volunteers can take part
- Conditions the study is for
- Neck Circumference, Difficulty of Tracheal Intubation
- How many people
- 216 participants
- Where
- 1 siteUnited States
- Study dates
- Aug 2010to Dec 2010
- Phase
- Observational
- 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 to 80 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Study population: adult patients who require tracheal intubation for general anesthesia and surgery
Who may be able to join
- American Society of Anesthesiologists physical status 1-4
- Receiving general endotracheal anesthesia for surgery
Who cannot join
- Limited range of motion of the neck or jaw
- Cervical spine injuries
- Upper airway pathology
- Previous facial trauma, or goiter
- Patients receiving regional anesthesia or anesthesia other than general, endotracheal anesthesia
Trial locations and contacts
1 site in 1 country.
United States1 site
Charleston Area Medical Center
Charleston, West Virginia, 25304
About this study
The circumference of a person's neck is a useful predictor of difficulty of insertion of a breathing tube.
What is being measured
The primary outcome is the main question the study is designed to answer.
Predictive value of neck circumference and Mallampati class for difficult tracheal intubation
Evaluation of neck circumference (using a 43 cm threshold) and Mallampati classification as preoperative clinical predictors of difficult tracheal intubation.
Measured: During the immediate preoperative period and anesthesia induction (at the time of intubation)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted31 Aug 2010 (estimated)
- Study startAug 2010
- Primary completionDec 2010
- Study completionDec 2010
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Neck Circumference, Difficulty of Tracheal IntubationStudies 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
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 216 participants (actual)
Sponsor and investigators
- Lead sponsor
- CAMC Health System
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01191658
- Sponsor's protocol ID
- 10-07-2252
- Status last verified
- Aug 2026
- First submitted
- 27 Aug 2010
- Last updated
- 19 Aug 2026
- Results posted
- No
- Data monitoring committee
- No
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
- Can Neck Circumference Measurements Less Than 43cm or Greater Than 43cm Predict Difficulty of Tracheal Intubation?
- ClinicalTrials.gov ID
- NCT01191658
- Acronym / sponsor ID
- 10-07-2252
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 216 participants (actual)
- Lead sponsor
- CAMC Health SystemUniversity, hospital or other
- Study start
- Aug 2010
- Primary completion
- Dec 2010 (actual)
- Study completion
- Dec 2010 (actual)
- First posted
- 31 Aug 2010 (estimated)
- 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 circumference of a person's neck is a useful predictor of difficulty of insertion of a breathing tube.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 to 80 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
- Study population
- adult patients who require tracheal intubation for general anesthesia and surgery
Key inclusion criteria (2 listed)
- American Society of Anesthesiologists physical status 1-4
- Receiving general endotracheal anesthesia for surgery
Key exclusion criteria (5 listed)
- Limited range of motion of the neck or jaw
- Cervical spine injuries
- Upper airway pathology
- Previous facial trauma, or goiter
- Patients receiving regional anesthesia or anesthesia other than general, endotracheal anesthesia
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Predictive value of neck circumference and Mallampati class for difficult tracheal intubation
Time frame: During the immediate preoperative period and anesthesia induction (at the time of intubation)
Evaluation of neck circumference (using a 43 cm threshold) and Mallampati classification as preoperative clinical predictors of difficult tracheal intubation.
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.
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?
An observational study of Neck Circumference, Difficulty of Tracheal Intubation, run by CAMC Health System at 1 site in United States.
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 2 inclusion and 5 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 United States. 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?
Predictive value of neck circumference and Mallampati class for difficult tracheal intubation (time frame: During the immediate preoperative period and anesthesia induction (at the time of intubation)). 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.