Sleep apnea
Summary
Sleep apnea, also spelled sleep apnoea, is a sleep disorder characterized by pauses in breathing or instances of shallow breathing during sleep. Each pause in breathing, called apnea, can last for several seconds to several minutes. By definition, more than five episodes an hour must occur. Similarly, each abnormally shallow breathing event is called a hypopnea. Sleep apnea is classified as a dyssomnia. When breathing is paused, carbon dioxide builds up in the bloodstream. Chemoreceptors in the blood stream note the high carbon dioxide levels. The brain is signaled to wake the person sleeping and breathe in air. Breathing normally will restore oxygen levels and the person will fall asleep again. Sleep apnea is often diagnosed with an overnight sleep test called a polysomnogram, or "sleep study".
Sources
- "Robbins Basic Pathology" Elsevier (2017)
- "Harrison's Principles of Internal Medicine, Twentieth Edition (Vol.1 & Vol.2)" McGraw-Hill Education / Medical (2018)
- "Pathophysiology of Disease: An Introduction to Clinical Medicine 8E" McGraw-Hill Education / Medical (2018)
- "CURRENT Medical Diagnosis and Treatment 2020" McGraw Hill Professional (2019)
- "Meta-analysis: Continuous Positive Airway Pressure Improves Insulin Resistance in Patients with Sleep Apnea without Diabetes" Annals of the American Thoracic Society (2013)
- "Obstructive sleep apnoea syndrome and its management" Therapeutic Advances in Chronic Disease (2015)
- "Sleep Pathologies in Depression and the Clinical Utility of Polysomnography" The Canadian Journal of Psychiatry (2010)