Biomarkers of Dementia in Chronic Sleep and Breathing Disorders

Eligibility criteria

Inclusion Criteria:
Control:
1. Males and females;
2. Aged 40-65 years;
3. Able to give informed consent;
4. Able to perform neuropsychological and cognitive testing;
5. Fluent in English.
OSA:
1. Males and females;
2. Aged 40-65 years;
3. Oximetry confirmed moderate to severe OSA based on the oxygen desaturation index (ODI) ≥15/hr;
4. Able to give informed consent;
5. Ability to perform neuropsychological and cognitive testing;
6. Fluent in English.
COPD:
1. Males and females;
2. Aged 40-65 years;
3. COPD confirmed by diagnosis or a positive lung function test (GOLD 2 minimum, FEV1
   ≥50%, \< 80% predicted; FEV1/FVC \< 0.7);
4. 10-pack year smoking history;
5. Able to perform neuropsychological and cognitive testing;
6. Fluent in English.
Overlap Syndrome:
1. Males and females;
2. Aged 40-65 years;
3. Oximetry confirmed moderate to severe OSA based on the oxygen desaturation index (ODI) ≥15/hr;
4. COPD confirmed by diagnosis or a positive lung function test (GOLD 2 minimum, FEV1
   ≥50%, \< 80% predicted; FEV1/FVC \< 0.7);
5. 10-pack year smoking history;
6. Able to perform neuropsychological and cognitive testing;
7. Fluent in English.
Exclusion Criteria:
1. Dementia diagnosis;
2. At home or overnight oxygen therapy;
3. Asthma diagnosis (identified with lung function bronchodilator);
4. Current antipsychotic use;
5. BMI > 40;
6. PAP use or OSA treatment in the last 2 months;
7. Recent COPD exacerbation with change in symptomology (hospitalisation and/or steroids and/or antibiotics) within 6 weeks;
8. Awake supine oxygen saturations of \< 93%;
9. Sleep disorders including narcolepsy, idiopathic hypersomnia (IH), moderate-severe restless leg syndrome (RLS) or REM behaviour disorder (RBD);
10. Other major comorbidities (other lung diseases, neurodegenerative disease, brain injury, severe mental illness, PTSD);
11. Uncontrolled depression (impacting daily life, no use of medications or engagement with psychotherapy- dictated by physician);
12. Malignancies (basal cell carcinoma accepted);
13. Any contraindication for MRI.
14. New York Heart Association (NYHA) score of IV or hospitalisation from heart failure in the last 6 months.

The sponsor's own eligibility wording, lightly reformatted. The study team makes the final eligibility decision — worth discussing with your doctor.

Eligibility criteria as of 2024-04-22