Inflammation and Neurocognitive Damage Markers in Elderly People With Obstructive Sleep Apnea
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Obstructive Sleep Apnea
- Sponsor
- Hospital de Clinicas de Porto Alegre
- Enrollment
- 76
- Locations
- 1
- Primary Endpoint
- Serum level of Brain derived neurotrophic factor
- Last Updated
- 4 years ago
Overview
Brief Summary
The aging process tends to promote an overall increase in inflammation compromising the immunologic system regulation, sleep/wakefulness pattern, and neurocognitive performance. In elders, there is an increase in repetitive arousals during sleep, secondary to breathing interruption by pharynx collapse, generating a transient reduction in oxygen delivery to the brain known as obstructive sleep apnea. This lack in oxygen supply results in an inflammatory process producing brain damage. Some substances present in the blood seem to be associated to neurocognitive damage, like S100β protein, cortisol, interleukin 1-β,6 and TNF-α. In the other way, a substance called brain-derived neurotrophic factor (BDNF) enhances cognitive function, and memory consolidation improvement.
Detailed Description
An intermittent hypoxia in obstructive sleep apnea induces the production of reactive oxygen species (ROS), oxidative damage and inflammation generating pro-inflammatory cytokines, reactive gliosis and neuronal damage. The increase in oxidative damage seems to be associated to age, contributing to the progress of neurodegeneration. Transient hypoxemia leads to autonomic excitation causing hyperactivity of the sympathetic nervous system (SNS), and activation of the hypothalamic-pituitary-adrenal (HPA) axis, causing immunological changes and increased risk of damage to mental functions. Night awakenings caused by OSA are associated with changes on the HPA axis, resulting in increased serum cortisol levels. The fluctuation in serum cortisol levels at night is intrinsically related to sleep, and increases with advancing age. BDNF is responsible for increasing the growth of neurites, and synaptogenesis, preventing programmed cell death in adults, and is involved in stress responses on the HPA axis. Low BDNF levels are associated to cognitive impairment, less memory consolidation, depression, and OSA. There is a positive correlation between levels of BDNF and cortisol related to physiological regulation of brain activities. The increase in oxidative damage caused by intermittent hypoxia during obstructive sleep apnea increases serum levels of the s100β protein promoting reactive gliosis or astrogliosis being associated to depression in the elderly. Obstructive sleep apnea syndrome is associated with development of cardiovascular and neurological diseases by activating pro-inflammatory pathways. However, in elderly individuals, regardless of other specific pathologies, they already have a pro-inflammatory state secondary to loss of regulation of the immune system.
Investigators
Eligibility Criteria
Inclusion Criteria
- Not provided
Exclusion Criteria
- Not provided
Outcomes
Primary Outcomes
Serum level of Brain derived neurotrophic factor
Time Frame: Baseline
Serum of brain-derived neurotrophic factor will be analyzed in the plasma of elderly volunteers using the Sandwich ELISA method.
Secondary Outcomes
- Serum level of s100B protein(Baseline)
- Depression(Baseline)
- Quality of life Score(Baseline)
- Inflammatory markers(Baseline)
- Serum Cortisol levels(Baseline)
- Neurocognitive Damage(Baseline)