Cricothyroid MembraneNCT05043025
Patient Positions for Locating the Cricothyroid Membrane
A study testing Identification of the cricothyroid membrane in people with Cricothyroid Membrane, run by SMG-SNU Boramae Medical Center at 1 site in South Korea.
Trial summary
Cricothyroidotomy is an emergency rescue technique to secure the airway in a 'Can't intubate, Can't Oxygenate' (CICO) situation. The cricothyroid membrane (CTM) is the target site of cricothyroidotomy, and accurate identification of the CTM is essential for successful cricothyroidotomy. Read more about this study
- Who is it for?
- Ages 19 years and older, women only
- Conditions the study is for
- Cricothyroid Membrane
- What is being tested?
- Identification of the cricothyroid membrane
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 116 participants
- Where
- 1 siteSouth Korea
- Study dates
- 1 Jul 2022to 30 Dec 2024
- 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 19 years and older
- Women only
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- body mass index >30 kg/m2
Who cannot join
- anatomical abnormalities or pathologies of the neck
- a history of neck surgery
- cervical spine disorders
- skin lesions on the neck
Trial locations and contacts
1 site in 1 country.
South Korea1 site
SMG-SNU Boramae Medical Center
Seoul, Select State/Province, 07061
About this study
Official title: Comparison of Patient Positions for Locating the Cricothyroid Membrane
Cricothyroidotomy is an emergency rescue technique to secure the airway in a 'Can't intubate, Can't Oxygenate' (CICO) situation. The cricothyroid membrane (CTM) is the target site of cricothyroidotomy, and accurate identification of the CTM is essential for successful cricothyroidotomy. In this study, the investigators compare patient positions (neck extension vs. modified ramped position) in terms of the success rate for identifying the CTM in obese patients.
- Conditions
- Cricothyroid Membrane
- Being tested
- Identification of the cricothyroid membrane
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Identification of the cricothyroid membraneOther
The cricothyroid membrane is identified using a laryngeal handshake technique in different patient positions.
| Study group | Role | What they receive |
|---|---|---|
| Neck extension group | Active comparator | The cricothyroid membrane is identified in a neck extended position. Receives: Other: Identification of the cricothyroid membrane |
| Modified ramped position group | Experimental | The cricothyroid membrane is identified in a modified ramped position. Receives: Other: Identification of the cricothyroid membrane |
What is being measured
The primary outcome is the main question the study is designed to answer.
Success rate for the correct identification of the cricothyroid membrane
After identifying the cricothyroid membrane using a laryngeal handshake technique in different head positions, an assessor evaluates the correctness of its localization using ultrasound.
Measured: Immediately after identifying the cricothyroid membrane using a laryngeal handshake technique
Secondary outcomes (3)
Duration for identifying the cricothyroid membrane
Time taken to locate the cricothyroid membrane is checked.
Measured: At 90 seconds after administering neuromuscular blockade
Distances between the center of the actual and perceived cricothyroid membrane
Distances between the center of the actual and perceived cricothyroid membrane is measured using ultrasound.
Measured: Immediately after identifying the cricothyroid membrane using a laryngeal handshake technique
Perceived difficulty during cricothyroid membrane identification
Anatomical difficulty perceived by the anesthesiologists during cricothyroid membrane identification is assessed (1, very easy; 2, easy; 3, moderate; 4, difficult; and 5, very difficult).
Measured: At 5 minutes after identifying the cricothyroid membrane using a laryngeal handshake technique
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted13 Sep 2021
- Study start1 Jul 2022
- Primary completion30 Dec 2024
- Study completion30 Dec 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Cricothyroid MembraneStudies 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
- Single blind
- Who is masked
- Participant
- Enrolment
- 116 participants (actual)
Sponsor and investigators
- Lead sponsor
- SMG-SNU Boramae Medical Center
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Jin-Young Hwang, SMG-SNU Boramae Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05043025
- Sponsor's protocol ID
- 08-2021
- Status last verified
- Dec 2025
- First submitted
- 31 Aug 2021
- Last updated
- 11 Dec 2025
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 11 Dec 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Comparison of Patient Positions for Locating the Cricothyroid Membrane
- ClinicalTrials.gov ID
- NCT05043025
- Acronym / sponsor ID
- 08-2021
- Conditions
- Cricothyroid Membrane
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 116 participants (actual)
- Lead sponsor
- SMG-SNU Boramae Medical CenterUniversity, hospital or other
- Study start
- 1 Jul 2022 (actual)
- Primary completion
- 30 Dec 2024 (actual)
- Study completion
- 30 Dec 2024 (actual)
- First posted
- 13 Sep 2021 (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.
Cricothyroidotomy is an emergency rescue technique to secure the airway in a 'Can't intubate, Can't Oxygenate' (CICO) situation. The cricothyroid membrane (CTM) is the target site of cricothyroidotomy, and accurate identification of the CTM is essential for successful cricothyroidotomy. In this study, the investigators compare patient positions (neck extension vs. modified ramped position) in terms of the success rate for identifying the CTM in obese patients.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Neck extension group | Active comparator | Other: Identification of the cricothyroid membraneThe cricothyroid membrane is identified in a neck extended position. |
| Modified ramped position group | Experimental | Other: Identification of the cricothyroid membraneThe cricothyroid membrane is identified in a modified ramped position. |
Who may qualify
- Ages
- 19 years and older
- Sex
- Female only
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- body mass index >30 kg/m2
Key exclusion criteria (4 listed)
- anatomical abnormalities or pathologies of the neck
- a history of neck surgery
- cervical spine disorders
- skin lesions on the neck
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 |
|---|---|---|
| Identification of the cricothyroid membraneThe cricothyroid membrane is identified using a laryngeal handshake technique in different patient positions. | Other | Modified ramped position group, Neck extension group |
Primary outcome
Success rate for the correct identification of the cricothyroid membrane
Time frame: Immediately after identifying the cricothyroid membrane using a laryngeal handshake technique
After identifying the cricothyroid membrane using a laryngeal handshake technique in different head positions, an assessor evaluates the correctness of its localization using ultrasound.
3 secondary outcomes
Duration for identifying the cricothyroid membrane
Time frame: At 90 seconds after administering neuromuscular blockade
Distances between the center of the actual and perceived cricothyroid membrane
Time frame: Immediately after identifying the cricothyroid membrane using a laryngeal handshake technique
Perceived difficulty during cricothyroid membrane identification
Time frame: At 5 minutes after identifying the cricothyroid membrane using a laryngeal handshake technique
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 11 Dec 2025.
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 Identification of the cricothyroid membrane in people with Cricothyroid Membrane, run by SMG-SNU Boramae Medical Center at 1 site in South Korea.
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 4 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 11 Dec 2025. 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 South Korea. 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?
Success rate for the correct identification of the cricothyroid membrane (time frame: Immediately after identifying the cricothyroid membrane using a laryngeal handshake technique). 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 11 Dec 2025.