The Effects of Successful OSA Treatment on Memory and AD Biomarkers in Older Adults Study

Study Overview
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Brief Summary
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The Effects of Successful OSA TreatmENT on Memory and AD BIomarkers in Older AduLts (ESSENTIAL) study is a 5-year, multicenter randomized open-label trial that will screen 400 cognitively normal older adults recruited from well-established sleep clinics at 4 academic medical centers, with newly diagnosed moderate-severe OSA. An expected 200 OSA patients will be then randomized to one of two groups: i) a 3-month OSA treatment by any combination of PAP, OAT, and positional therapy that results in an effective AHI4%< 10/hour and AHI3A<20/hour (see below); ii) a waitlist control group to receive treatment at the conclusion of the 3-month intervention period. Both groups will continue follow-up for 24 months on stable therapy to determine if sustained improvements in sleep are associated with improvement in cognitive function and AD biomarkers.

Detailed Description
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The prevalence of Alzheimer disease (AD) is high and projected to increase. While there are multiple risk factors for AD, epidemiological data suggests that  15% of AD risk may be attributed to sleep problems. Obstructive sleep apnea (OSA) is common among the elderly (30-55%), and the investigators have shown that cognitively normal older women with OSA have nearly double the risk of developing mild cognitive impairment (MCI) or dementia over 5 years. Further, the investigators have shown that in normal elderly, OSA predicts longitudinal increases in AD biomarkers. Our preliminary data also show that after positive airway pressure (PAP) withdrawal, OSA patients treated with PAP experienced significant overnight increases in plasma neurofilament light (NfL), a marker of neural injury. The present study is designed to overcome challenges identified in previous trials of treatment of OSA to slow cognitive decline and progression to AD. First, the most effective treatment for OSA, PAP therapy, has poor adherence (typically only 50% are adequately treated). Other common therapies include oral appliance therapy (OAT) which tends to be better tolerated but less effective. The investigators have piloted and propose for this study a rapid multimodal therapy initiation (RMMT) which ensures subjects will have effective therapy for their OSA that reduces OSA severity to AHI4%<10/hour and AHI3A (AKA pRDI) < 20/hour within 4 months. Second, most prior OSA treatment trials have focused primarily on symptomatic older adults (e.g. patients with MCI recruited from memory clinics), whereas early intervention in pre-symptomatic individuals may have stronger impact in preventing progression to AD. The investigators propose to enroll cognitively normal adults with newly diagnosed moderate-severe OSA (AHI4% >20/hour or AHI3A > 40/hour). Finally, selection of cognitive outcomes most responsive to OSA therapy has proved challenging. The Effects of Successful OSA TreatmENT on Memory and AD BIomarkers in Older AduLts (ESSENTIAL) study is a 5-year, multicenter randomized open-label trial that will screen 400 cognitively normal older adults (MoCA≥24, Clinical Dementia Rating [CDR]=0), ages 55-75, recruited from well-established sleep clinics at 4 academic medical centers, with newly diagnosed moderate-severe OSA (AHI4% >20/hour or AHI3A > 40/hour). An expected 200 OSA patients will be then randomized to one of two groups: i) a 3-month OSA treatment by any combination of PAP, OAT, and positional therapy that results in an effective AHI4%< 10/hour and AHI3A<20/hour (see below); ii) a waitlist control group to receive treatment at the conclusion of the 3-month intervention period. Both groups will continue follow-up for 24 months on stable therapy to determine if sustained improvements in sleep are associated with improvement in cognitive function and AD biomarkers. Both arms will include PSG and actigraphy, sleep-dependent memory and other cognitive evaluations, and blood draws at baseline, 3 and 24 months, with cognitive evaluation only at 12 months. Structural brain MRI will be performed at baseline. Because the investigators anticipate that 150 of 200 subjects will be well treated at 24 months, and 50 will not be, the investigators will additionally recruit  50 subjects (on average 13 subjects per clinical site) with the same inclusion criteria who refuse treatment. These 50 subjects will perform baseline (blood draw and cognitive evaluations), 12-month (cognitive evaluation only), and 24-month (blood draw and cognitive evaluations) visits, allowing for a 24-month comparison of  150 subjects with adequate treatment over 24 months to 100 subjects with inadequate treatment over 24 months. Our aims are: 1) To compare 3-month change in plasma AD biomarkers (NfL, p-tau, Aβ) in those randomized to OSA treatment and wait-list control groups (via both intention-to-treat and per-protocol analyses); 2) To test differences at 3 months in sleep-dependent declarative memory and cognitive scores (PACC and sub-domains) between the OSA treatment and wait-list control groups (via both intention-to-treat and per-protocol analyses); 3) To compare 24-month changes in AD biomarkers (NfL, p-tau, Aβ) and cognition in all successfully treated subjects and untreated controls.

Official Title
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The Effects of Successful OSA Treatment on Memory and AD Biomarkers in Older Adults (ESSENTIAL) Study

Conditions
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Obstructive Sleep Apnea, Cognitive Decline

Intervention / Treatment
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* Device: Positive airway pressure
* Device: Oral appliance therapy
* Device: Positional therapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Cognitively normal (MoCA≥24, Clinical Dementia Rating [CDR]=0) with a minimum of 12 years of education Males and females, 55-75 years Moderate - severe OSA defined as AHI4 ≥20 events/hour or AHI3A>40/hr using a Hypopnea criterion of a 4% oxygen desaturation (AHI4) or 3% oxygen desaturation and/or EEG arousal (AHI3A) No OSA treatment Able and willing to be treated for OSA Fluency in English or Spanish Exclusion Criteria: Any other sleep or breathing disorder requiring supplemental oxygen. This includes circadian rhythm abnormalities, including irregular sleep-wake cycles defined as self-reported '≥3 sleep episodes per 24-hr period' or 'day to day irregularity of sleep/wake times greater than 2 hours' Anticipated scheduled bariatric surgery Chronic use of any sedative, stimulant, neuroleptic drugs, or other medications limiting validity of cognitive tests The presence of critical comorbid conditions, including clinically relevant endocrine or hematological conditions, substance abuse, preexisting cognitive, psychiatric, or neurological conditions, and pregnancy. History of stroke or MRI evidence of vascular damage, history of transient ischemic attacks or extensive white matter lesions (Fazekas scale >2) will also be excluded.

Ages Eligible for Study
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Minimum Age: 55 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Approximately 250 total patients ( 63 per site) will be enrolled. In the 3-month wait-list control randomized trial, 200 patients will be randomized to one of two groups: i) a 3-month OSA treatment by any combination of PAP, OAT, and positional therapy that results in an effective AHI3a<15 (rapid multi-modal treatment RMMT); ii) a waitlist control group to receive treatment at the conclusion of the 3-month intervention period. The remaining 50, plus an additional  50 (n 100 total) participants who declined treatment and were not interested in being randomized for the 3-month trial, or who have tried but failed treatment in the past, will serve as the control group for the 24-month follow-up period.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 3-month OSA treatment<br>A 3-month OSA treatment by any combination of PAP, OAT, and positional therapy that results in an effective AHI3a<15 (rapid multi-modal treatment RMMT). | Device: Positive airway pressure<br>* Positive airway pressure (PAP) therapy is a sleep apnea treatment that uses a stream of compressed air to support the airway during sleep. With PAP therapy, a mask is worn during sleep and a portable machine gently blows pressurized room air from into your upper airway through a tube connected to the mask. This positive airflow helps keep the airway open, preventing the collapse that occurs during apnea, thus allowing normal breathing.<br>* Other names: CPAP;Device: Oral appliance therapy<br>* Oral appliance therapy involves the use of a dental appliance or oral mandibular advancement device that prevents the tongue from blocking the throat and/or advances the lower jaw forward. These devices help keep the airway open during sleep.<br>* Other names: Somnomed;Device: Positional therapy<br>* A NightShift Sleep Positioner (Advanced Brain Monitoring) is a neck vibration device, FDA approved to treat positional sleep apnea. The device detects patient supine position and delivers a small vibratory signal to the back of the neck to prompt position change.<br>* Other names: NightShift Sleep Positioner;|
| Other: Waitlist control group<br>A waitlist control group to receive treatment at the conclusion of the 3-month intervention period. | Device: Positive airway pressure<br>* Positive airway pressure (PAP) therapy is a sleep apnea treatment that uses a stream of compressed air to support the airway during sleep. With PAP therapy, a mask is worn during sleep and a portable machine gently blows pressurized room air from into your upper airway through a tube connected to the mask. This positive airflow helps keep the airway open, preventing the collapse that occurs during apnea, thus allowing normal breathing.<br>* Other names: CPAP;Device: Oral appliance therapy<br>* Oral appliance therapy involves the use of a dental appliance or oral mandibular advancement device that prevents the tongue from blocking the throat and/or advances the lower jaw forward. These devices help keep the airway open during sleep.<br>* Other names: Somnomed;Device: Positional therapy<br>* A NightShift Sleep Positioner (Advanced Brain Monitoring) is a neck vibration device, FDA approved to treat positional sleep apnea. The device detects patient supine position and delivers a small vibratory signal to the back of the neck to prompt position change.<br>* Other names: NightShift Sleep Positioner;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in overnight memory retention on the A-B verbal paired associates task | Mean change in percent correct memory | 3 months | 
| Change in overnight memory retention on the A-B verbal paired associates task | Mean change in percent correct memory | 12 months | 
| Change in overnight memory retention on the A-B verbal paired associates task | Mean change in percent correct memory | 24 months | 
| Change in Aβ42/ Aβ40 ratio | Mean change in the Aβ42/ Aβ40 ratio in picograms per millimeter (pg/ml) | 3 months | 
| Change in Aβ42/ Aβ40 ratio | Mean change in the Aβ42/ Aβ40 ratio in picograms per millimeter (pg/ml) | 24 months | 
| Change in Plasma P-tau181 | Mean change in p-tau181 levels in the plasma in picograms per millimeter (pg/ml) | 3 months | 
| Change in Plasma P-tau181 | Mean change in p-tau181 levels in the plasma in picograms per millimeter (pg/ml) | 24 months | 
| Change in P-tau217 | Mean change in p-tau217 levels in the plasma in picograms per millimeter (pg/ml) | 3 months | 
| Change in P-tau217 | Mean change in p-tau217 levels in the plasma in picograms per millimeter (pg/ml) | 24 months | 
| Change in Neurofibrilary light (NfL) | Mean change in NfL levels in the plasma in picograms per millimeter (pg/ml) | 3 months | 
| Change in Neurofibrilary light (NfL) | Mean change in NfL levels in the plasma in picograms per millimeter (pg/ml) | 24 months | 
| Preclinical Cognitive Composite Score | Mean change in Preclinical Cognitive Composite Score. | 3 months | 
| Preclinical Cognitive Composite Score | Mean change in Preclinical Cognitive Composite Score. | 12 months | 
| Preclinical Cognitive Composite Score | Mean change in Preclinical Cognitive Composite Score. | 24 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in Task-switching Accuracy | Change in Task-switching Mean Percent Accuracy | 3 months | 
| Change in Task-switching Accuracy | Change in Task-switching Mean Percent Accuracy | 12 months | 
| Change in Task-switching Accuracy | Change in Task-switching Mean Percent Accuracy | 24 months | 
| Change in Task-switching Reaction Time | Change in Task-switching Mean Reaction Time in milliseconds | 3 months | 
| Change in Task-switching Reaction Time | Change in Task-switching Mean Reaction Time in milliseconds | 12 months | 
| Change in Task-switching Reaction Time | Change in Task-switching Mean Reaction Time in milliseconds | 24 months | 
| Change in Psychomotor Vigilance Task (PVT) lapses | Mean change in number of lapses | 3 months | 
| Change in Psychomotor Vigilance Task (PVT) lapses | Mean change in number of lapses | 12 months | 
| Change in Psychomotor Vigilance Task (PVT) lapses | Mean change in number of lapses | 24 months | 
| Change in Psychomotor Vigilance Task (PVT) reaction time | Mean change in median reaction time in milliseconds. | 3 months | 
| Change in Psychomotor Vigilance Task (PVT) reaction time | Mean change in median reaction time in milliseconds. | 12 months | 
| Change in Psychomotor Vigilance Task (PVT) reaction time | Mean change in median reaction time in milliseconds. | 24 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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AD, Obstructive Sleep Apnea, OSA, Cognitive decline, Alzheimer Disease, AD biomarkers, Positive Airway Pressure, PAP, CPAP, Oral appliance therapy, OAT, Positional therapy, Sleep-dependent memory