Superior Laryngeal Nerve BlockNCT06065475
Ultrasound-guided Thyroid Cartilage Plane Block for Awake Intubation
A study testing Ultrasound-guided bilateral Thyroid Cartilage Plane Block in people with Superior Laryngeal Nerve Block, run by Nanjing First Hospital, Nanjing Medical University at 1 site in China.
Trial summary
The goal of this clinical trial is to investigate the clinical effectiveness and safety of superior laryngeal nerve block through surface injection of local anesthetic solution on the thyroid cartilage in patients undergoing general anesthesia with endotracheal intubation. Read more about this study
- Who is it for?
- Ages 18 to 65 years
- Conditions the study is for
- Superior Laryngeal Nerve Block
- What is being tested?
- Ultrasound-guided bilateral Thyroid Cartilage Plane Block
- Type of treatment
- Pill or oral medicine, Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 60 participants
- Where
- 1 siteChina
- Study dates
- 15 Oct 2023to 28 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 18 to 65 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Patients scheduled for awake tracheal intubation surgery under general anesthesia.
- Patients with difficult airways (e.g., limited cervical spine mobility, full stomach, partial airway obstruction, craniofacial deformities or trauma, micrognathia, mouth opening <3cm, Mallampati III or IV classification) posing challenges for mask ventilation or intubation.
- Age between 18 and 65 years.
- Gender is not restricted.
- ASA classification of I or II.
Who cannot join
- Cardiovascular dysfunction or arterial aneurysms.
- Mental or neurological disorders or concomitant arterial aneurysms.
- Infection at the puncture site.
- Allergy to local anesthetics.
- Continuous use of antiplatelet or anticoagulant medications preoperatively.
- Hoarseness or coughing while drinking water.
- Bronchial asthma.
- Participation in other clinical trials within the previous 3 months before enrollment 9.r current participation in other clinical trials.
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Ultrasound-guided Thyroid Cartilage Plane Block for Patients With Awake Tracheal Intubation: a Randomized Controlled Trial
The goal of this clinical trial is to investigate the clinical effectiveness and safety of superior laryngeal nerve block through surface injection of local anesthetic solution on the thyroid cartilage in patients undergoing general anesthesia with endotracheal intubation. The main questions it aims to answer are the effectiveness of ultrasound-guided Thyroid Cartilage Plane Block for superior laryngeal nerve blockadethe and the safety and ease of performance.
All patients are divided into the Thyroid Cartilage Plane Block Group (T Group) and the Control Group (C Group). Patients in the C Group receive airway surface anesthesia using the fiberoptic bronchoscope-guided local anesthetic spray method throughout the procedure. In the experimental T Group, ultrasound-guided bilateral Thyroid Cartilage Plane Block is performed using the thyroid cartilage as an anatomical landmark. Local anesthetic is injected on the surface of the thyroid cartilage.
Compare the following parameters between the two groups: duration of the blocking procedure, Ramsay Sedation Score, patient coughing upon contact of the fiberoptic bronchoscope with the vocal cords before intubation, comfort score immediately after intubation, and tracheal tube tolerance after successful intubation.
Read the detailed description
Select 60 patients undergoing elective awake tracheal intubation surgery. Instruct patients to fast （no food or drink） for 8 hours before the procedure. Upon admission to the operating room, monitor patients' ECG （electrocardiogram）, BP （blood pressure）, and SpO2 （pulse oxygen saturation）. Establish intravenous access in the upper extremities and administer normal saline solution. Administer a loading dose of dexmedetomidine at 0.5 μg/kg over 5 minutes and remifentanil 0.5μg.kg-1, followed by an infusion at a rate of 0.3-0.6 μg/（kg·h） , 0.1μg.kg-1.min-1 by micropump infusion respectively. Perform radial artery puncture and catheter placement for invasive arterial pressure monitoring. Use a computer-generated random number table to allocate patients into two groups in a 1:1 ratio. To ensure objectivity, a nurse not involved in the study prepares sealed opaque envelopes containing the group assignments. All patients are divided into the Thyroid Cartilage Plane Block Group （T Group） and the Control Group （C Group）. All patients received topical oral and pharyngeal anesthesia using 2.4% lidocaine spray administered by an experienced anesthesiologist. The pharyngeal surface was sprayed twice, with each spray lasting one second, and repeated after a 5-minute interval. Each spray contained approximately 16 mg lidocaine. Patients in the C Group receive airway surface anesthesia using the fiberoptic bronchoscope-guided local anesthetic spray method throughout the vocal cord and tracheal with 5 ml 2% lidocaine respectively. In the experimental T Group, ultrasound-guided bilateral Thyroid Cartilage Plane Block is performed using the thyroid cartilage plate as an anatomical landmark.2.5 ml 2% lidocaine local anesthetic is injected on the surface of the thyroid cartilage plate. The blocking procedure is as follows: Use a Sonosite high-frequency linear array transducer (5-13 MHz, Sonosite, USA). Place the transducer parallel to the spine on one side of the neck, ensuring clear visualization of the thyroid cartilage plate under ultrasound. Employ ultrasound-guided out-of-plane techniques to display the needle insertion path and tip. Once the needle tip contacts the upper half of the thyroid cartilage plate, inject 2.5ml of 2% lidocaine on the surface of the thyroid cartilage plate （the dosage is consistent with the commonly used local anesthetic volume for classic superior laryngeal nerve block methods in clinical practice）. Subsequently, perform fiberoptic bronchoscope-guided subglottic, and tracheal surface anesthesia. After completing surface anesthesia, select an appropriate-sized tracheal tube and perform fiberoptic bronchoscope-guided tracheal intubation, securing it properly.
- Conditions
- Superior Laryngeal Nerve Block
- Being tested
- Ultrasound-guided bilateral Thyroid Cartilage Plane Block
- Keywords
- Thyroid Cartilage, Superior Laryngeal Nerve, Difficult airway, ultrasound, Awake tracheal intubation
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Ultrasound-guided bilateral Thyroid Cartilage Plane BlockBehavioural
Use a SonoSite high-frequency linear array transducer (5-13 MHz, SonoSite, USA). Place the transducer parallel to the spine on one side of the neck, ensuring clear visualization of the thyroid cartilage plate under ultrasound. Employ ultrasound-guided out-of-plane techniques to display the needle insertion path and tip. Once the needle tip contacts the upper half of the thyroid cartilage plate, injecting 2.5ml of 2% lidocaine on the surface of the thyroid cartilage each side.
| Study group | Role | What they receive |
|---|---|---|
| Thyroid Cartilage Plane Block Group (T Group) | Experimental | All patients received topical oral and pharyngeal anesthesia using 2.4% lidocaine spray. The pharyngeal surface was sprayed twice, with each spray lasting one second, and repeated after a 5-minute interval. Ultrasound-guided bilateral Thyroid Cartilage Plane Block is performed using the thyroid cartilage plate as an anatomical landmark. 2.5ml of 2% lidocaine is injected on the surface of the thyroid cartilage each side. Subsequently, perform fiberoptic bronchoscope-guided subglottis and tracheal surface topical anesthesia using 5ml of 2% lidocaine. After completing surface anesthesia, perform fiberoptic bronchoscope-guided tracheal intubation, securing it properly. Receives: Behavioral: Ultrasound-guided bilateral Thyroid Cartilage Plane Block |
| the Control Group （C Group） | No intervention | Patients in the C Group received topical oral and pharyngeal anesthesia using 2.4% lidocaine spray. The pharyngeal surface was sprayed twice, with each spray lasting one second, and repeated after a 5-minute interval. Patients in the C Group receive airway topical anesthesia using the fiberoptic bronchoscope-guided local anesthetic spray method throughout the vocal cord and tracheal with 5 ml 2% lidocaine respectively. |
What is being measured
The primary outcome is the main question the study is designed to answer.
quality of airway anesthesia
TThe primary outcome in this trial was quality of airway anesthesia assessed on a 5-point scale,Quality of airway anesthesia was graded as: 0=no coughing or gagging in response to intubation, 1=mild coughing and/or gagging that did not hinder intubation, 2=moderate coughing and/or gagging that interfered minimally with intubation, 3=severe coughing and/or gagging that made intubation difficult and 4=very severe coughing and/or gagging that required additional local anesthetic and/or change in technique.The lower grade means a better quality of airway anesthesia.
Measured: Upon intubation
Secondary outcomes (9)
Mean Arterial Pressure （MAP）
Stable blood pressure indicates a good neural blockade effect.
Measured: T0: upon entry to the operating room,T1: before insertion of the tracheal tube,T2: immediately after tracheal tube insertion,T3: 5 minutes after successful intubation
Heart Rate （HR）
The smaller the heart rate fluctuations, the better the neural blockade effect.
Measured: T0: upon entry to the operating room,T1: before insertion of the tracheal tube,T2: immediately after tracheal tube insertion,T3: 5 minutes after successful intubation
Ramsay Sedation Score
The Ramsay Sedation Score is as follows: 6 points for unarousable, 5 points for slow response to stimulus, 4 points for asleep but easily aroused, 3 points for quiet and cooperative with orientation, 2 points for asleep, anxious, restless, and 1 point for asleep, agitated, and restless. Satisfactory sedation falls within 2-4 points, while oversedation is indicated by 5-6 points.
Measured: T0: upon entry to the operating room,T1: before insertion of the tracheal tube,T2: immediately after tracheal tube insertion,T3: 5 minutes after successful intubation
The number of patients with lowered pitch
A lowered pitch indicates a good neural blockade effect.
Measured: Before intubation
The time of the block procedure
The neural blockade procedure time reflects the ease of the operation, with a shorter time indicating a simpler neural blockade procedure.
Measured: From ultrasound probe positioning the target to completion of drug administration
Record coughing in patients when the fiberoptic bronchoscope touches the glottis
The patient's coughing upon contact of the fiberoptic bronchoscope with the vocal cords before intubation reflects the effectiveness of neural blockade. A lower degree of coughing indicates a better neural blockade effect. 1 point for no response, 2 points for mild cough, 3 points for severe cough.
Measured: Before intubation
The tolerance of the tube
The tolerance of the tube reflects the patient's tolerance to awake tracheal intubation. A higher level of tolerance indicates a better neural blockade effect. 3 points for severe resistance requiring immediate general anesthesia, 2 points for restlessness and mild resistance, 1 point for cooperation.
Measured: After successful intubation
Adverse reactions such as coughing and nausea/ vomiting..
The lower the incidence of coughing, nausea, and vomiting, the better the neural blockade effect.
Measured: During intubation
Occurrences of sore throat and lowered pitch
Pharyngeal pain and decreased vocal tone are used to assess postoperative complications of neural blockade.
Measured: Post-extubation,24 hours after surgery
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 Oct 2023
- Study start15 Oct 2023
- Primary completion27 Dec 2024
- Study completion28 Dec 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for Superior Laryngeal Nerve BlockStudies of the same condition, open and under way.
- More trials run by Nanjing First Hospital, Nanjing Medical UniversityThe sponsor's other registered studies.
- 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
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind
- Who is masked
- Care provider, Investigator, Outcomes assessor
- Enrolment
- 60 participants (actual)
Sponsor and investigators
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Tao Shan, Nanjing First Hospital, Nanjing Medical University
- Investigators
- Tao Shan, Study chair, Nanjing First Hospital, Nanjing Medical University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06065475
- Sponsor's protocol ID
- KY20230829-10
- Status last verified
- Feb 2026
- First submitted
- 17 Sep 2023
- Last updated
- 4 Feb 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Wiles JR, Kelly J, Mostafa SM. Hypotension and bradycardia following superior laryngeal nerve block. Br J Anaesth. 1989 Jul;63(1):125-7. doi: 10.1093/bja/63.1.125.
PubMed 2765339Canty DJ, Poon L. Superior laryngeal nerve block: an anatomical study comparing two techniques. J Clin Anesth. 2014 Nov;26(7):517-22. doi: 10.1016/j.jclinane.2014.03.005. Epub 2014 Oct 16.
PubMed 25439414Fowler JG, VanEenenaam DP Jr, Johnson KN, Courtemanche CD, Strathman AJ, Reynolds JE. Single midline injection for bilateral superior laryngeal nerve block. J Clin Anesth. 2020 Nov;66:109922. doi: 10.1016/j.jclinane.2020.109922. Epub 2020 Jun 6. No abstract available.
PubMed 32516680
Study at a glance
From the registry record, last updated by the sponsor on 4 Feb 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Ultrasound-guided Thyroid Cartilage Plane Block for Patients With Awake Tracheal Intubation: a Randomized Controlled Trial
- ClinicalTrials.gov ID
- NCT06065475
- Acronym / sponsor ID
- KY20230829-10
- Conditions
- Superior Laryngeal Nerve Block
- Keywords
- Thyroid Cartilage, Superior Laryngeal Nerve, Difficult airway, ultrasound, Awake tracheal intubation
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 60 participants (actual)
- Lead sponsor
- Nanjing First Hospital, Nanjing Medical UniversityUniversity, hospital or other
- Study start
- 15 Oct 2023 (actual)
- Primary completion
- 27 Dec 2024 (actual)
- Study completion
- 28 Dec 2024 (actual)
- First posted
- 4 Oct 2023 (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 goal of this clinical trial is to investigate the clinical effectiveness and safety of superior laryngeal nerve block through surface injection of local anesthetic solution on the thyroid cartilage in patients undergoing general anesthesia with endotracheal intubation. The main questions it aims to answer are the effectiveness of ultrasound-guided Thyroid Cartilage Plane Block for superior laryngeal nerve blockadethe and the safety and ease of performance.
All patients are divided into the Thyroid Cartilage Plane Block Group (T Group) and the Control Group (C Group). Patients in the C Group receive airway surface anesthesia using the fiberoptic bronchoscope-guided local anesthetic spray method throughout the procedure. In the experimental T Group, ultrasound-guided bilateral Thyroid Cartilage Plane Block is performed using the thyroid cartilage as an anatomical landmark. Local anesthetic is injected on the surface of the thyroid cartilage.
Compare the following parameters between the two groups: duration of the blocking procedure, Ramsay Sedation Score, patient coughing upon contact of the fiberoptic bronchoscope with the vocal cords before intubation, comfort score immediately after intubation, and tracheal tube tolerance after successful intubation.
Detailed description
Select 60 patients undergoing elective awake tracheal intubation surgery. Instruct patients to fast （no food or drink） for 8 hours before the procedure. Upon admission to the operating room, monitor patients' ECG （electrocardiogram）, BP （blood pressure）, and SpO2 （pulse oxygen saturation）. Establish intravenous access in the upper extremities and administer normal saline solution. Administer a loading dose of dexmedetomidine at 0.5 μg/kg over 5 minutes and remifentanil 0.5μg.kg-1, followed by an infusion at a rate of 0.3-0.6 μg/（kg·h） , 0.1μg.kg-1.min-1 by micropump infusion respectively. Perform radial artery puncture and catheter placement for invasive arterial pressure monitoring. Use a computer-generated random number table to allocate patients into two groups in a 1:1 ratio. To ensure objectivity, a nurse not involved in the study prepares sealed opaque envelopes containing the group assignments. All patients are divided into the Thyroid Cartilage Plane Block Group （T Group） and the Control Group （C Group）. All patients received topical oral and pharyngeal anesthesia using 2.4% lidocaine spray administered by an experienced anesthesiologist. The pharyngeal surface was sprayed twice, with each spray lasting one second, and repeated after a 5-minute interval. Each spray contained approximately 16 mg lidocaine. Patients in the C Group receive airway surface anesthesia using the fiberoptic bronchoscope-guided local anesthetic spray method throughout the vocal cord and tracheal with 5 ml 2% lidocaine respectively. In the experimental T Group, ultrasound-guided bilateral Thyroid Cartilage Plane Block is performed using the thyroid cartilage plate as an anatomical landmark.2.5 ml 2% lidocaine local anesthetic is injected on the surface of the thyroid cartilage plate. The blocking procedure is as follows: Use a Sonosite high-frequency linear array transducer (5-13 MHz, Sonosite, USA). Place the transducer parallel to the spine on one side of the neck, ensuring clear visualization of the thyroid cartilage plate under ultrasound. Employ ultrasound-guided out-of-plane techniques to display the needle insertion path and tip. Once the needle tip contacts the upper half of the thyroid cartilage plate, inject 2.5ml of 2% lidocaine on the surface of the thyroid cartilage plate （the dosage is consistent with the commonly used local anesthetic volume for classic superior laryngeal nerve block methods in clinical practice）. Subsequently, perform fiberoptic bronchoscope-guided subglottic, and tracheal surface anesthesia. After completing surface anesthesia, select an appropriate-sized tracheal tube and perform fiberoptic bronchoscope-guided tracheal intubation, securing it properly.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Thyroid Cartilage Plane Block Group (T Group) | Experimental | Behavioral: Ultrasound-guided bilateral Thyroid Cartilage Plane BlockAll patients received topical oral and pharyngeal anesthesia using 2.4% lidocaine spray. The pharyngeal surface was sprayed twice, with each spray lasting one second, and repeated after a 5-minute interval. Ultrasound-guided bilateral Thyroid Cartilage Plane Block is performed using the thyroid cartilage plate as an anatomical landmark. 2.5ml of 2% lidocaine is injected on the surface of the thyroid cartilage each side. Subsequently, perform fiberoptic bronchoscope-guided subglottis and tracheal surface topical anesthesia using 5ml of 2% lidocaine. After completing surface anesthesia, perform fiberoptic bronchoscope-guided tracheal intubation, securing it properly. |
| the Control Group （C Group） | No intervention | –Patients in the C Group received topical oral and pharyngeal anesthesia using 2.4% lidocaine spray. The pharyngeal surface was sprayed twice, with each spray lasting one second, and repeated after a 5-minute interval. Patients in the C Group receive airway topical anesthesia using the fiberoptic bronchoscope-guided local anesthetic spray method throughout the vocal cord and tracheal with 5 ml 2% lidocaine respectively. |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (5 listed)
- Patients scheduled for awake tracheal intubation surgery under general anesthesia.
- Patients with difficult airways (e.g., limited cervical spine mobility, full stomach, partial airway obstruction, craniofacial deformities or trauma, micrognathia, mouth opening <3cm, Mallampati III or IV classification) posing challenges for mask ventilation or intubation.
- Age between 18 and 65 years.
- Gender is not restricted.
- ASA classification of I or II.
Key exclusion criteria (8 listed)
- Cardiovascular dysfunction or arterial aneurysms.
- Mental or neurological disorders or concomitant arterial aneurysms.
- Infection at the puncture site.
- Allergy to local anesthetics.
- Continuous use of antiplatelet or anticoagulant medications preoperatively.
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 |
|---|---|---|
| Ultrasound-guided bilateral Thyroid Cartilage Plane BlockUse a SonoSite high-frequency linear array transducer (5-13 MHz, SonoSite, USA). Place the transducer parallel to the spine on one side of the neck, ensuring clear visualization of the thyroid cartilage plate under ultrasound. Employ ultrasound-guided out-of-plane techniques to display the needle insertion path and tip. Once the needle tip contacts the upper half of the thyroid cartilage plate, injecting 2.5ml of 2% lidocaine on the surface of the thyroid cartilage each side. | Behavioural | Thyroid Cartilage Plane Block Group (T Group) |
Primary outcome
quality of airway anesthesia
Time frame: Upon intubation
TThe primary outcome in this trial was quality of airway anesthesia assessed on a 5-point scale,Quality of airway anesthesia was graded as: 0=no coughing or gagging in response to intubation, 1=mild coughing and/or gagging that did not hinder intubation, 2=moderate coughing and/or gagging that interfered minimally with intubation, 3=severe coughing and/or gagging that made intubation difficult and 4=very severe coughing and/or gagging that required additional local anesthetic and/or change in technique.The lower grade means a better quality of airway anesthesia.
9 secondary outcomes
Mean Arterial Pressure （MAP）
Time frame: T0: upon entry to the operating room,T1: before insertion of the tracheal tube,T2: immediately after tracheal tube insertion,T3: 5 minutes after successful intubation
Heart Rate （HR）
Time frame: T0: upon entry to the operating room,T1: before insertion of the tracheal tube,T2: immediately after tracheal tube insertion,T3: 5 minutes after successful intubation
Ramsay Sedation Score
Time frame: T0: upon entry to the operating room,T1: before insertion of the tracheal tube,T2: immediately after tracheal tube insertion,T3: 5 minutes after successful intubation
The number of patients with lowered pitch
Time frame: Before intubation
The time of the block procedure
Time frame: From ultrasound probe positioning the target to completion of drug administration
Record coughing in patients when the fiberoptic bronchoscope touches the glottis
Time frame: Before intubation
The tolerance of the tube
Time frame: After successful intubation
Adverse reactions such as coughing and nausea/ vomiting..
Time frame: During intubation
Occurrences of sore throat and lowered pitch
Time frame: Post-extubation,24 hours after surgery
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 4 Feb 2026.
- Background: PubMed 2765339Wiles JR, Kelly J, Mostafa SM. Hypotension and bradycardia following superior laryngeal nerve block. Br J Anaesth. 1989 Jul;63(1):125-7. doi: 10.1093/bja/63.1.125.
- Background: PubMed 25439414Canty DJ, Poon L. Superior laryngeal nerve block: an anatomical study comparing two techniques. J Clin Anesth. 2014 Nov;26(7):517-22. doi: 10.1016/j.jclinane.2014.03.005. Epub 2014 Oct 16.
- Background: PubMed 32516680Fowler JG, VanEenenaam DP Jr, Johnson KN, Courtemanche CD, Strathman AJ, Reynolds JE. Single midline injection for bilateral superior laryngeal nerve block. J Clin Anesth. 2020 Nov;66:109922. doi: 10.1016/j.jclinane.2020.109922. Epub 2020 Jun 6. No abstract available.
- Individual participant dataSharing planned: No
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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.
Tao Shan study chair
Nanjing First Hospital, Nanjing Medical University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Ultrasound-guided bilateral Thyroid Cartilage Plane Block in people with Superior Laryngeal Nerve Block, run by Nanjing First Hospital, Nanjing Medical University at 1 site in China.
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 5 inclusion and 8 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 4 Feb 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 China. 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?
quality of airway anesthesia (time frame: Upon intubation). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT06065475, which also lists 3 linked publications.
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 4 Feb 2026.