Obstructive Sleep ApneaNCT04139499
Use of High-resolution Manometry to Detect Upper Airway Obstruction During Sleep
An observational study of Obstructive Sleep Apnea, run by University of Wisconsin, Madison at 1 site in United States.
Trial summary
Obstructive sleep apnea (OSA) is a major public health issue in both children and adults, present in 1-5% of children and 10-30% of adults. It is characterized by repeated episodes of airway obstruction during sleep, leading to brain arousal, sympathetic activation, oxygen desaturation, sleep fragmentation, and… Read more about this study
- Who is it for?
- Ages 5 to 90 yearsHealthy volunteers can take part
- Conditions the study is for
- Obstructive Sleep Apnea
- What is being tested?
- Drug-induced sleep endoscopy (DISE) and High-resolution manometry (HRM):
- Type of treatment
- Surgery or procedure
- How many people
- 18 participants
- Where
- 1 siteUnited States
- Study dates
- 16 Jan 2019to 5 May 2021
- 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 5 to 90 years
- All sexes
- Healthy volunteers accepted
- Child, Adult, Older adult
Study population: Majority of subjects will be those children and adults who will be undergoing DISE as part of their standard clinical care. However, it is desirable to have cleaner controls without obstruction at any level to confirm that the visual absence of obstruction also represents a manometrically normal respiration. Thus, subjects without symptoms of obstructive sleep apnea who are undergoing a surgical procedure will be recruited. Simultaneous performance of DISE (to confirm no obstruction) and HRM in such subjects would take about 5 minutes. Further, the time required is within the variability typically expected at an academic center where trainees may participate in cases.
Who may be able to join
- ADULTS
- Age 18-90
- Any participant undergoing sleep endoscopy as part of standard clinical care would be eligible. This entails physician concern for sleep-disordered breathing and corresponding questionnaire and/or polysomnogram results supporting a diagnosis of obstructive sleep apnea.
- Participants without apnea are eligible, provided they are undergoing tonsillectomy or bronchoscopy for either chronic tonsillitis or airway assessment without concern for history of sleep apnea.
- Women with childbearing potential will not be excluded, as the proposed experiment would have no potential ramifications on childbearing potential.
- CHILDREN
Show all 10Show fewer
- Age 5-17
- Any patients undergoing sleep endoscopy as part of standard clinical care would be eligible.
- Participants undergoing either tonsillectomy for chronic tonsillitis or bronchoscopy for airway assessment.
- Women with childbearing potential will not be excluded, as the proposed experiment would have no potential ramifications on childbearing potential.
Who cannot join
- Participant desire to avoid added anesthesia time.
- Inability to safely tolerate the added anesthesia time (about 5-10 minutes) for the experiment (as judged by either otolaryngologist or anesthesiologist).
- Pregnant women
- Vulnerable groups (i.e., prisoners, individuals lacking consent capacity, individuals unable to read the consent form).
Trial locations and contacts
1 site in 1 country.
About this study
Obstructive sleep apnea (OSA) is a major public health issue in both children and adults, present in 1-5% of children and 10-30% of adults. It is characterized by repeated episodes of airway obstruction during sleep, leading to brain arousal, sympathetic activation, oxygen desaturation, sleep fragmentation, and non-restorative sleep. Patients report daytime tiredness, insomnia, and morning headaches. Children with OSA experience daytime somnolence, difficulties at school, behavioral problems, enuresis, and reduced quality of life. If left untreated, OSA can lead to numerous complications including hypertension, cardiovascular disease, stroke, and insulin resistance. Sleep partners are also affected, with patients viewing their disorder as a burden and sleeping in separate rooms. Further, disease prevalence is increasing as obesity increases.
Continuous positive airway pressure (CPAP) is the current gold standard treatment for OSA. If used effectively and consistently, it can improve patient symptoms. However, adherence is generally poor, with patients experiencing physical discomfort, chest discomfort, and dry mouth. For those patients that cannot tolerate CPAP, surgical intervention is an option. In children, this typically starts with adenotonsillectomy. However, 20-75% of children will have persistent symptoms after adenotonsillectomy. In adults, anatomic factors including tonsil hypertrophy and redundant pharyngeal tissue can contribute to upper airway obstruction and may also necessitate higher pressures for effective CPAP treatment. Even if surgical intervention does not cure the OSA, it may make CPAP more tolerable and improve CPAP adherence.
Read more
Sleep-related airway obstruction is a complex phenomenon potentially involving multiple anatomic levels. For patients with persistent symptoms despite initial therapy or intolerance to CPAP, further evaluation of the upper airway is clinically valuable. Polysomnography (PSG) is the gold standard for diagnosing OSA, but it does not provide information on the location(s) of upper airway obstruction. Knowledge of the precise sites of obstruction is critical to planning effective sleep surgery. Currently, this is accomplished with drug-induced sleep endoscopy (DISE). DISE was originally proposed in 1991 and involves administering anesthetic to a patient to simulate a sleep state, and then visualizing the upper airway using transnasal flexible endoscopy. Sites of obstruction at key locations including the adenoids, soft palate, lateral oropharynx, tongue base, and epiglottis can be identified.
Though DISE offers valuable clinical information, it has notable limitations. First, it cannot evaluate the entire upper airway simultaneously, as any obstruction occurring superiorly precludes visualization of any obstruction occurring more inferiorly. Second, interpretation of DISE is subjective and there is no universally accepted system for analysis. Rating systems are qualitative, using grades such as complete, partial, or no obstruction as opposed to quantitative measurements.
The optimal sleep assessment would be quantitative, reliable, and provide information on the entire upper airway simultaneously. A potential alternative to DISE which could meet these criteria is sleep manometry. Measurement of upper airway pressures captures the effects of obstruction along the entire upper airway, from the nasopharynx to larynx. Prior studies have attempted to employ manometry, but have been limited primarily by inadequate equipment and suboptimal methods of data analysis. Woodson et al. used a solid-state manometer with diameter of 2.3 mm and 5 sensors to detect palatal obstruction and tongue base obstruction in patients with OSA. They also used the same approach to detect persistent tongue base obstruction following uvulopalatopharyngoplasty. While these studies help demonstrate that manometry can be a useful adjunct to OSA assessment, they are severely limited both by the type of manometer used as well as the lack of a clear, detailed description of the method of data analysis.
High-resolution manometry (HRM) uses pressure censors spaced 1 cm apart to allow for pressure measurement along the entire upper airway. The investigators have previously applied HRM to assessment of swallow physiology. Sophisticated methods of automated data analysis have been developed that have been shown to be reliable for both expert and novice users . Further, pattern recognition techniques have been applied to identify dysphagia and specific swallowing abnormalities. Application of this technology and modification of existing data analysis platforms will allow for a quantitative, reliable, and comprehensive assessment of upper airway obstruction during sleep in both children and adults, with potential for development of algorithms to predict effects of targeted surgical therapy at all levels of the upper airway.
- Conditions
- Obstructive Sleep Apnea
- Being tested
- Drug-induced sleep endoscopy (DISE), High-resolution manometry (HRM):
- Keywords
- sleep apnea, Continuous positive airway pressure (CPAP), Sleep manometry
- Medical subject headings
- Sleep Apnea, Obstructive, Sleep Apnea Syndromes
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Drug-induced sleep endoscopy (DISE)Procedure or surgery
DISE involves administering anesthetic to a patient to simulate a sleep state, and then visualizing the upper airway using transnasal flexible endoscopy. Sites of obstruction at key locations including the adenoids, soft palate, lateral oropharynx, tongue base, and epiglottis can be identified.
High-resolution manometry (HRM):Procedure or surgery
After the necessary clinical information has been obtained (if obstruction is occurring at those levels and, if so, to what degree), a flexible high-resolution manometry (HRM) catheter will be passes through the contralateral nostril to record pressure along the length of the pharynx at those same sites.
| Study group | Role | What they receive |
|---|---|---|
| Adults with OSA | Adults with obstruction at any or all of the four levels of interest (velopharynx, oropharynx, tongue base, epiglottis) will represent the experimental group. Receives: Procedure: Drug-induced sleep endoscopy (DISE); Procedure: High-resolution manometry (HRM): | |
| Children with OSA | Children with obstruction at any or all of the four levels of interest (velopharynx, oropharynx, tongue base, epiglottis) will represent the experimental group. Receives: Procedure: Drug-induced sleep endoscopy (DISE); Procedure: High-resolution manometry (HRM): | |
| Adult control | Adult without any obstruction at four levels of interest (velopharynx, oropharynx, tongue base, epiglottis) will represent a control. Receives: Procedure: Drug-induced sleep endoscopy (DISE); Procedure: High-resolution manometry (HRM): | |
| Children control | Children exam will be done for all the participants. Subject without obstruction represent a control. Receives: Procedure: Drug-induced sleep endoscopy (DISE); Procedure: High-resolution manometry (HRM): |
What is being measured
The primary outcome is the main question the study is designed to answer.
Baseline pressure at different levels of obstruction in OSA participants as measured by HRM
Baseline pressure at different levels of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Measured: Up to 24 hour
Maximum pressure at different levels of obstruction in OSA participants as measured by HRM
Maximum pressure at different levels of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Measured: Up to 24 hour
Duration of pressure elevation at different levels of obstruction in OSA participants as measured by HRM
Duration of pressure at different regions of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Measured: Up to 24 hour
Pressure integral at different levels of obstruction in OSA participants as measured by HRM
Pressure integral at different regions of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Measured: Up to 24 hour
Number of participants identified with upper airway obstruction during sleep using DISE vs HRM
Number of participants identified with upper airway obstruction during sleep will be a parameter to compare the efficacy of HRM and to evaluate if HRM can compliment DISE for diagnosing the level of obstruction. Obstruction can be at the velopharynx, oropharynx, tongue base, and epiglottis
Measured: Up to 24 hour
Apnea-hypopnea index (AHI) as obtained from polysomnography
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, apnea-hypopnea index (AHI) will be obtained from polysomnography.
AHI is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and be associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both the number of sleep disruptions and the degree of oxygen desaturation (low oxygen level in the blood).
The AHI values for adults are categorized as:
Normal: AHI<5 Mild sleep apnea: 5≤AHI<15 Moderate sleep apnea: 15≤AHI<30 Severe sleep apnea: AHI≥30 For children, because of their different physiology, an AHI in excess of 1 is considered abnormal. Pediatric patients presenting with AHI of 2 or greater will often be referred for treatment.
Measured: Up to 24 hour
Pediatric Sleep Questionnaire score as an indicator of OSA severity
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, Pediatric Sleep Questionnaire score will be obtained.
This scale contains 22 symptom items that ask about snoring frequency, loud snoring, observed apneas, difficulty breathing during sleep, daytime sleepiness, inattentive or hyperactive behavior, and other pediatric OSA features. If eight or more statements are answered "yes", child is referred for sleep evaluation. Higher score correlates to more severe OSA.
Measured: Up to 24 hour
Epworth Sleepiness Scale score as an indicator of OSA severity
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, Epworth Sleepiness Scale score will be obtained.
The Epworth Sleepiness Scale is widely used in the field of sleep medicine as a subjective measure of a patient's sleepiness. The test is a list of eight situations in which participants rate their tendency to become sleepy on a scale of 0, no chance of dozing, to 3, high chance of dozing. When they finish the test, the values are added up. The total score is based on a scale of 0 to 24. The scale estimates whether the participants are experiencing excessive sleepiness that possibly requires medical attention. Scores range from 0 to 24, having scores above 9 implicate that the person is considerably sleepy to seek medical attention.
Measured: Up to 24 hour
To determine the relationship between manometric variables and STOP-BANG Sleep Apnea Questionnaire score
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, STOP-BANG Sleep Apnea Questionnaire score will be obtained.
The snoring, tiredness, observed apnea, high BP (STOP) and snoring, tiredness, observed apnea, high BP-BMI, age, neck circumference and gender (STOP-Bang) questionnaire consists of 8 yes/no questions.
For general population Low risk of OSA: Yes to 0-2 questions Intermediate risk of OSA: Yes to 3-4 questions High risk of OSA: Yes to 5-8 questions or Yes to 2 or more of 4 STOP questions + male gender or Yes to 2 or more of 4 STOP questions + BMI > 35 kg/m2 or Yes to 2 or more of 4 STOP questions + neck circumference (17"/43cm in male, 16"/41cm in female)
Measured: Up to 24 hour
Efficacy of manometric variables to predict which subjects benefit from surgical interventions for OSA
to determine if manometric variables can predict which subjects benefit from surgical interventions (performed as part of standard clinical care) based on changes in postoperative obstructive sleep apnea assessments.
Measured: 2 years
Correlation between the outcome of surgery and manometric variables as assessed by the number of participants with improved Apnea-hypopnea index (AHI) after surgery
In this study, "improvement" in OSA symptoms will be defined as at least a 50% change in AHI or questionnaire score. Logistic regression analyses will be performed to determine if there is a difference in the aforementioned manometric parameters between patients who improve and do not improve for interventions at a given level (velopharynx, oropharynx, tongue base, epiglottis).
Measured: 2 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted25 Oct 2019
- Study start16 Jan 2019
- Primary completion5 May 2021
- Study completion5 May 2021
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Obstructive Sleep ApneaStudies of the same condition, open and under way.
- More trials run by University of Wisconsin, MadisonThe 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
- Observational
- Observational model
- Case-control
- Time perspective
- Prospective
- Enrolment
- 18 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Wisconsin, Madison
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Timothy M Mcculloch, MD, FACS, Principal investigator, University of Wisconsin, Madison
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04139499
- Sponsor's protocol ID
- 2018-0184
- Other IDs
- SMPH/SURGERY/OTOLARYNGOLOGY, A539770, UWF-SMPH -Funding
- Status last verified
- Nov 2025
- First submitted
- 22 Oct 2019
- Last updated
- 13 Nov 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 13 Nov 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Use of High-resolution Manometry to Detect Upper Airway Obstruction During Sleep
- ClinicalTrials.gov ID
- NCT04139499
- Acronym / sponsor ID
- 2018-0184
- Conditions
- Obstructive Sleep Apnea
- Keywords
- sleep apnea, Continuous positive airway pressure (CPAP), Sleep manometry
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 18 participants (actual)
- Lead sponsor
- University of Wisconsin, MadisonUniversity, hospital or other
- Study start
- 16 Jan 2019 (actual)
- Primary completion
- 5 May 2021 (actual)
- Study completion
- 5 May 2021 (actual)
- First posted
- 25 Oct 2019 (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.
Obstructive sleep apnea (OSA) is a major public health issue in both children and adults, present in 1-5% of children and 10-30% of adults. It is characterized by repeated episodes of airway obstruction during sleep, leading to brain arousal, sympathetic activation, oxygen desaturation, sleep fragmentation, and non-restorative sleep. Patients report daytime tiredness, insomnia, and morning headaches. Children with OSA experience daytime somnolence, difficulties at school, behavioral problems, enuresis, and reduced quality of life. If left untreated, OSA can lead to numerous complications including hypertension, cardiovascular disease, stroke, and insulin resistance. Sleep partners are also affected, with patients viewing their disorder as a burden and sleeping in separate rooms. Further, disease prevalence is increasing as obesity increases.
Continuous positive airway pressure (CPAP) is the current gold standard treatment for OSA. If used effectively and consistently, it can improve patient symptoms. However, adherence is generally poor, with patients experiencing physical discomfort, chest discomfort, and dry mouth. For those patients that cannot tolerate CPAP, surgical intervention is an option. In children, this typically starts with adenotonsillectomy. However, 20-75% of children will have persistent symptoms after adenotonsillectomy. In adults, anatomic factors including tonsil hypertrophy and redundant pharyngeal tissue can contribute to upper airway obstruction and may also necessitate higher pressures for effective CPAP treatment. Even if surgical intervention does not cure the OSA, it may make CPAP more tolerable and improve CPAP adherence.
Sleep-related airway obstruction is a complex phenomenon potentially involving multiple anatomic levels. For patients with persistent symptoms despite initial therapy or intolerance to CPAP, further evaluation of the upper airway is clinically valuable. Polysomnography (PSG) is the gold standard for diagnosing OSA, but it does not provide information on the location(s) of upper airway obstruction. Knowledge of the precise sites of obstruction is critical to planning effective sleep surgery. Currently, this is accomplished with drug-induced sleep endoscopy (DISE). DISE was originally proposed in 1991 and involves administering anesthetic to a patient to simulate a sleep state, and then visualizing the upper airway using transnasal flexible endoscopy. Sites of obstruction at key locations including the adenoids, soft palate, lateral oropharynx, tongue base, and epiglottis can be identified.
Though DISE offers valuable clinical information, it has notable limitations. First, it cannot evaluate the entire upper airway simultaneously, as any obstruction occurring superiorly precludes visualization of any obstruction occurring more inferiorly. Second, interpretation of DISE is subjective and there is no universally accepted system for analysis. Rating systems are qualitative, using grades such as complete, partial, or no obstruction as opposed to quantitative measurements.
The optimal sleep assessment would be quantitative, reliable, and provide information on the entire upper airway simultaneously. A potential alternative to DISE which could meet these criteria is sleep manometry. Measurement of upper airway pressures captures the effects of obstruction along the entire upper airway, from the nasopharynx to larynx. Prior studies have attempted to employ manometry, but have been limited primarily by inadequate equipment and suboptimal methods of data analysis. Woodson et al. used a solid-state manometer with diameter of 2.3 mm and 5 sensors to detect palatal obstruction and tongue base obstruction in patients with OSA. They also used the same approach to detect persistent tongue base obstruction following uvulopalatopharyngoplasty. While these studies help demonstrate that manometry can be a useful adjunct to OSA assessment, they are severely limited both by the type of manometer used as well as the lack of a clear, detailed description of the method of data analysis.
High-resolution manometry (HRM) uses pressure censors spaced 1 cm apart to allow for pressure measurement along the entire upper airway. The investigators have previously applied HRM to assessment of swallow physiology. Sophisticated methods of automated data analysis have been developed that have been shown to be reliable for both expert and novice users . Further, pattern recognition techniques have been applied to identify dysphagia and specific swallowing abnormalities. Application of this technology and modification of existing data analysis platforms will allow for a quantitative, reliable, and comprehensive assessment of upper airway obstruction during sleep in both children and adults, with potential for development of algorithms to predict effects of targeted surgical therapy at all levels of the upper airway.
Study design
- Observational model
- Case-control
- Time perspective
- Prospective
- Number of arms
- 4
| Arm | Type | Receives |
|---|---|---|
| Adults with OSA | – | Procedure: Drug-induced sleep endoscopy (DISE), Procedure: High-resolution manometry (HRM):Adults with obstruction at any or all of the four levels of interest (velopharynx, oropharynx, tongue base, epiglottis) will represent the experimental group. |
| Children with OSA | – | Procedure: Drug-induced sleep endoscopy (DISE), Procedure: High-resolution manometry (HRM):Children with obstruction at any or all of the four levels of interest (velopharynx, oropharynx, tongue base, epiglottis) will represent the experimental group. |
| Adult control | – | Procedure: Drug-induced sleep endoscopy (DISE), Procedure: High-resolution manometry (HRM):Adult without any obstruction at four levels of interest (velopharynx, oropharynx, tongue base, epiglottis) will represent a control. |
| Children control | – | Procedure: Drug-induced sleep endoscopy (DISE), Procedure: High-resolution manometry (HRM):Children exam will be done for all the participants. Subject without obstruction represent a control. |
Who may qualify
- Ages
- 5 to 90 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult, Older adult
- Study population
- Majority of subjects will be those children and adults who will be undergoing DISE as part of their standard clinical care. However, it is desirable to have cleaner controls without obstruction at any level to confirm that the visual absence of obstruction also represents a manometrically normal respiration. Thus, subjects without symptoms of obstructive sleep apnea who are undergoing a surgical procedure will be recruited. Simultaneous performance of DISE (to confirm no obstruction) and HRM in such subjects would take about 5 minutes. Further, the time required is within the variability typically expected at an academic center where trainees may participate in cases.
Key inclusion criteria (10 listed)
- ADULTS
- Age 18-90
- Any participant undergoing sleep endoscopy as part of standard clinical care would be eligible. This entails physician concern for sleep-disordered breathing and corresponding questionnaire and/or polysomnogram results supporting a diagnosis of obstructive sleep apnea.
- Participants without apnea are eligible, provided they are undergoing tonsillectomy or bronchoscopy for either chronic tonsillitis or airway assessment without concern for history of sleep apnea.
- Women with childbearing potential will not be excluded, as the proposed experiment would have no potential ramifications on childbearing potential.
Key exclusion criteria (4 listed)
- Participant desire to avoid added anesthesia time.
- Inability to safely tolerate the added anesthesia time (about 5-10 minutes) for the experiment (as judged by either otolaryngologist or anesthesiologist).
- Pregnant women
- Vulnerable groups (i.e., prisoners, individuals lacking consent capacity, individuals unable to read the consent form).
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 |
|---|---|---|
| Drug-induced sleep endoscopy (DISE)DISE involves administering anesthetic to a patient to simulate a sleep state, and then visualizing the upper airway using transnasal flexible endoscopy. Sites of obstruction at key locations including the adenoids, soft palate, lateral oropharynx, tongue base, and epiglottis can be identified. | Procedure or surgery | Adult control, Adults with OSA, Children control, Children with OSA |
| High-resolution manometry (HRM):After the necessary clinical information has been obtained (if obstruction is occurring at those levels and, if so, to what degree), a flexible high-resolution manometry (HRM) catheter will be passes through the contralateral nostril to record pressure along the length of the pharynx at those same sites. | Procedure or surgery | Adult control, Adults with OSA, Children control, Children with OSA |
Primary outcome
Baseline pressure at different levels of obstruction in OSA participants as measured by HRM
Time frame: Up to 24 hour
Baseline pressure at different levels of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Maximum pressure at different levels of obstruction in OSA participants as measured by HRM
Time frame: Up to 24 hour
Maximum pressure at different levels of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Duration of pressure elevation at different levels of obstruction in OSA participants as measured by HRM
Time frame: Up to 24 hour
Duration of pressure at different regions of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Pressure integral at different levels of obstruction in OSA participants as measured by HRM
Time frame: Up to 24 hour
Pressure integral at different regions of obstruction in OSA participants will be measured by HRM. The aim is to determine if HRM can identify obstruction at the velopharynx, oropharynx, tongue base, and epiglottis as seen on DISE. obstruction at each site will be identified on DISE. Subject data will be divided into three groups for each site based on results from the DISE exam, which are currently used clinically: no obstruction (<50% obstructed), partial obstruction (50-75% obstruction), or complete obstruction (>75% obstruction). Investigator will be checking if values differ across the three categories of obstruction.
Number of participants identified with upper airway obstruction during sleep using DISE vs HRM
Time frame: Up to 24 hour
Number of participants identified with upper airway obstruction during sleep will be a parameter to compare the efficacy of HRM and to evaluate if HRM can compliment DISE for diagnosing the level of obstruction. Obstruction can be at the velopharynx, oropharynx, tongue base, and epiglottis
Apnea-hypopnea index (AHI) as obtained from polysomnography
Time frame: Up to 24 hour
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, apnea-hypopnea index (AHI) will be obtained from polysomnography. AHI is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and be associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both the number of sleep disruptions and the degree of oxygen desaturation (low oxygen level in the blood). The AHI values for adults are categorized as: Normal: AHI<5 Mild sleep apnea: 5≤AHI<15 Moderate sleep apnea: 15≤AHI<30 Severe sleep apnea: AHI≥30 For children, because of their different physiology, an AHI in excess of 1 is considered abnormal. Pediatric patients presenting with AHI of 2 or greater will often be referred for treatment.
Pediatric Sleep Questionnaire score as an indicator of OSA severity
Time frame: Up to 24 hour
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, Pediatric Sleep Questionnaire score will be obtained. This scale contains 22 symptom items that ask about snoring frequency, loud snoring, observed apneas, difficulty breathing during sleep, daytime sleepiness, inattentive or hyperactive behavior, and other pediatric OSA features. If eight or more statements are answered "yes", child is referred for sleep evaluation. Higher score correlates to more severe OSA.
Epworth Sleepiness Scale score as an indicator of OSA severity
Time frame: Up to 24 hour
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, Epworth Sleepiness Scale score will be obtained. The Epworth Sleepiness Scale is widely used in the field of sleep medicine as a subjective measure of a patient's sleepiness. The test is a list of eight situations in which participants rate their tendency to become sleepy on a scale of 0, no chance of dozing, to 3, high chance of dozing. When they finish the test, the values are added up. The total score is based on a scale of 0 to 24. The scale estimates whether the participants are experiencing excessive sleepiness that possibly requires medical attention. Scores range from 0 to 24, having scores above 9 implicate that the person is considerably sleepy to seek medical attention.
To determine the relationship between manometric variables and STOP-BANG Sleep Apnea Questionnaire score
Time frame: Up to 24 hour
To determine the relationship between manometric variables and standard assessment used to evaluate OSA, STOP-BANG Sleep Apnea Questionnaire score will be obtained. The snoring, tiredness, observed apnea, high BP (STOP) and snoring, tiredness, observed apnea, high BP-BMI, age, neck circumference and gender (STOP-Bang) questionnaire consists of 8 yes/no questions. For general population Low risk of OSA: Yes to 0-2 questions Intermediate risk of OSA: Yes to 3-4 questions High risk of OSA: Yes to 5-8 questions or Yes to 2 or more of 4 STOP questions + male gender or Yes to 2 or more of 4 STOP questions + BMI > 35 kg/m2 or Yes to 2 or more of 4 STOP questions + neck circumference (17"/43cm in male, 16"/41cm in female)
Efficacy of manometric variables to predict which subjects benefit from surgical interventions for OSA
Time frame: 2 years
to determine if manometric variables can predict which subjects benefit from surgical interventions (performed as part of standard clinical care) based on changes in postoperative obstructive sleep apnea assessments.
Correlation between the outcome of surgery and manometric variables as assessed by the number of participants with improved Apnea-hypopnea index (AHI) after surgery
Time frame: 2 years
In this study, "improvement" in OSA symptoms will be defined as at least a 50% change in AHI or questionnaire score. Logistic regression analyses will be performed to determine if there is a difference in the aforementioned manometric parameters between patients who improve and do not improve for interventions at a given level (velopharynx, oropharynx, tongue base, epiglottis).
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 13 Nov 2025.
- 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.
Timothy M Mcculloch, MD, FACS principal investigator
University of Wisconsin, Madison
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 Obstructive Sleep Apnea, run by University of Wisconsin, Madison 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 10 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 13 Nov 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 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?
Baseline pressure at different levels of obstruction in OSA participants as measured by HRM (time frame: Up to 24 hour). The study lists 11 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 13 Nov 2025.