- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04322097
Mechanisms of Upper Airway Obstruction (DISE-CAD)
Characterizing Mechanisms of Upper Airway Obstruction During Drug-Induced Sleep Endoscopy (DISE)
Study Overview
Status
Conditions
Detailed Description
Obstructive sleep apnea (OSA) is characterized by recurrent upper airway obstruction due to inadequate muscle tone during sleep leading to nocturnal hypercapnia, repeated oxyhemoglobin desaturations and arousals. Continuous positive airway pressure (CPAP) is the therapeutic mainstay for OSA, but adherence remains poor. The loss of motor input to the tongue during sleep has been implicated as a cause for upper airway collapse. Activation of tongue muscles with implanted hypoglossal nerve stimulators is an effective therapy for some OSA patients. Nevertheless, approximately 1/3 of OSA patients did not respond to hypoglossal nerve stimulation despite rigorous selection criteria, leaving large segments of CPAP intolerant patients at risk for OSA-related morbidity. Thus, there is a critical knowledge gap in the role of lingual muscle activity in the maintenance of airway patency.
The current study is designed to examine underlying mechanisms of action of lingual muscles in the maintenance of airway patency during sleep. The investigators' major hypothesis is that specific tongue muscles are responsible for relieving upper airway obstruction during sleep. To address this hypothesis, the investigators will (1) selectively stimulate specific lingual muscle groups (viz., protrudors and retractors) and measure effects on airway patency during Drug Induced Sleep Endoscopy (DISE). The investigators will (2) correlate responses in patency to alterations in tongue morphology (as assessed with ultrasound imaging). The investigators will (3) examine the impact of anatomic factors (e.g., the size of the maxillo-mandibular enclosure) on airway responses to stimulation. Patients will (4) undergo magnetic resonance imaging (MRI) determine the extent to which maxillo-mandibular size and tongue size and fat content compress pharyngeal structures. The investigators will (5) assess apnea severity and hypoglossal nerve stimulation with Inspire to measure response to therapy via split-night PSGs. The investigators will (6) examine digital morphometrics to quantify pharyngeal anatomy. A final goal is to (7) measure tongue force, as tongue force measurements may elucidate mechanisms of therapy response as related to neuromuscular control.
The study will contain two distinct pathways, Study A and Study B, in order to efficiently execute the protocol. Study A will focus primarily on measurements obtained as part of routine clinical care. Study B will focus on enhanced imaging and physiology techniques in patients using lingual muscle stimulation (Inspire).
*As of 6/11/2021, the target recruitment for Study A was completed*
Study A:
- To determine the contribution of defects in upper airway function to the pathogenesis of airway obstruction at specific sites of pharyngeal collapse by characterizing upper airway pressure-flow/area relationships during DISE.
- To determine the impact of jaw thrust and mouth closure maneuvers to functional determinants of upper airway obstruction at specific sites of pharyngeal collapse.
- To examine effects of maxillo-mandibular restriction and tongue size on upper airway functional properties during DISE.
Study B (In addition to the objectives for Study A):
- To assess effects of stimulating specific lingual muscles on upper airway patency during natural sleep and drug-induced sleep.
- To assess whether craniofacial morphology predicts improvements in pharyngeal patency during sleep with stimulation.
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Everett Seay
- Phone Number: 2156158777
- Email: everett.seay@pennmedicine.upenn.edu
Study Locations
-
-
Pennsylvania
-
Philadelphia, Pennsylvania, United States, 19104
- Recruiting
- Hospital of the University of Pennsylvania
-
Contact:
- Raj Dedhia, MD
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Adults (≥ 22yrs)
- Implanted with the MRI-conditional Inspire hypoglossal nerve stimulator (Model 3028 or later)
- Compliant with Inspire therapy (> 20 hours/week over 2+ weeks) as a standalone treatment for sleep-disordered breathing
- Inspire remote model 2500 or later
Exclusion Criteria:
- MRI contraindications (claustrophobia, ferromagnetic implants, foreign bodies, etc)
- Inspire Implant Model 3024
- Inspire Remote Model 3032
- Patients who have fallen asleep while driving resulting in an accident or "near miss" accident within 1 year prior to device implantation
- Inability to sleep in the supine position (by self-report)
- History of severe difficulty initiating or maintaining sleep in the laboratory
- Pregnant women
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: Lingual Muscle Stimulation Patients
DISE
|
Tongue protrudor muscles will be stimulated
Outcome variables will be assess with and without mandibular advancement
Outcome variables will be measured with and without postural maneuvers
A digital camera with laser pointers will be used to capture a series of craniofacial photographs (frontal, profile and neck extended) and intra-oral photographs (junction of the hard and soft palate, airway, or base of tongue).
The patient will place a small bulb behind their lower incisors and will press using their tongue as hard as possible for two seconds.
This exercise will be repeated four times, with 30 seconds of rest in between each attempt.
The patient will then be instructed to press and hold their tongue against the bulb as hard as possible for 35 seconds.
This exercise will be repeated three times, with 2 minutes of rest in between each attempt.
The patient will undergo an MRI scan of the head and neck.
Other Names:
The patient will undergo a polysomnography (PSG).
The PSG study will include monitoring of EEG, submental EMG, EOG, SpO2, tidal airflow, thoraco-abdominal efforts, and body position.
The patient will spend half of the night at baseline (i.e.
no intervention), and the second half with lingual muscle stimulation activated.
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Upper airway critical pressure (Pcrit)
Time Frame: Within 3 months of enrollment
|
Measurement of airway collapsibility (cmH2O)
|
Within 3 months of enrollment
|
Pharyngeal compliance
Time Frame: Within 3 months of enrollment
|
area/pressure in cm2 per cmH2O
|
Within 3 months of enrollment
|
Amax
Time Frame: Within 3 months of enrollment
|
Measurement of maximal pharyngeal cross-sectional area (in cm-squared)
|
Within 3 months of enrollment
|
Segmental Airway Resistances
Time Frame: Within 3 months of enrollment
|
Measurement of pharyngeal resistances upstream and downstream to site of collapse (cmH2O/l/s)
|
Within 3 months of enrollment
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Tongue Force
Time Frame: Within 3 months of enrollment
|
Measurements of maximal tongue force and fatigue
|
Within 3 months of enrollment
|
Digital Morphometrics
Time Frame: Within 3 months of enrollment
|
Measurements of facial and oral airway dimensions
|
Within 3 months of enrollment
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Raj C Dedhia, MD, University of Pennsylvania
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 833511
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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