Aged 1 Article 1 Cerebrovascular Circulation 1 Continuous Positive Airway Pressure 1 Female 1 Hippocampus 1 Humans 1 Longitudinal Studies 1 Male 1 Middle Aged 1 Outcome Assessment, Health Care 1 Parahippocampal Gyrus 1 Polysomnography 1 Sleep Apnea, Obstructive 1 Tomography, Emission-Computed, Single-Photon 1 adult 1 aged 1 aging 1 brain blood flow 1 brain circulation 1 clinical article 1 continuous positive airway pressure 1 controlled study 1 diagnostic imaging 1 female 1 hexamethylpropylene amine oxime technetium tc 99m hippocampus 1 human 1 left hippocampus 1 longitudinal study 1