Causes of obstructive sleep apnea
Obstructive sleep apnea occurs when the muscles in the back of your throat relax. These muscles support the soft palate, the triangular piece of tissue hanging from the soft palate (uvula), the tonsils, the side walls of the throat and the tongue.
When the muscles relax, your airway narrows or closes as you breathe in, and you can't get an adequate breath in. This may lower the level of oxygen in your blood. Your brain senses this inability to breathe and briefly rouses you from sleep so you can reopen your airway. This awakening is usually so brief that you don't remember it.
You may make a snorting, choking or gasping sound. This pattern can repeat itself five to 30 times or more each hour, all night long. These disruptions impair your ability to reach the desired deep, restful phases of sleep, and you'll probably feel sleepy during your waking hours.
People with obstructive sleep apnea may not be aware that their sleep was interrupted. In fact, some people with this type of sleep apnea think they sleep well all night.
Causes of central sleep apnea
Central sleep apnea, which is much less common, occurs when your brain fails to transmit signals to your breathing muscles. You may awaken with shortness of breath or have a difficult time getting to sleep or staying asleep. Like with obstructive sleep apnea, snoring and daytime sleepiness can occur. The most common cause of central sleep apnea is heart failure and, less commonly, a stroke. People with central sleep apnea may be more likely to remember awakening than are people with obstructive sleep apnea.
July 24, 2012
- Ropper AH, et al. Adams & Victor's Principles of Neurology. 9th ed. New York, N.Y.: The McGraw-Hill Companies; 2009. http://www.accessmedicine.com/content.aspx?aID=3633173. Accessed May 1, 2012.
- What is sleep apnea? National Institute of Neurological Disorders and Stroke. http://www.ninds.nih.gov/disorders/sleep_apnea/sleep_apnea.htm. Accessed April 27, 2012.
- What is sleep apnea? National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/health-topics/topics/sleepapnea/. Accessed April 27, 2012.
- Longo DL, et al. Harrison's Online. 18th ed. New York, N.Y.: The McGraw-Hill Companies; 2012. http://www.accessmedicine.com/content.aspx?aID=9129170. Accessed May 1, 2012.
- Javaheri S. Central sleep apnea. Clinics in Chest Medicine. 2010;31:235.
- Badr MS. Central sleep apnea syndrome: Risk factors, clinical presentation, and diagnosis. http://www.uptodate.com/index. Accessed May 1, 2012.
- Yaggi HK, et al. Adult obstructive sleep apnea/hypopnea syndrome: Definitions, risk factors, and pathogenesis. Clinics in Chest Medicine. 2010;31:179.
- Strohl KP. Overview of obstructive sleep apnea in adults. http://www.uptodate.com/index. Accessed May 1, 2012.
- Tamisier R, et al. Cardiovascular effects of obstructive sleep apnea. http://www.uptodate.com/index. Accessed May 1, 2012.
- Sunwoo B, et al. Ambulatory management of patients with sleep apnea: Is there a place for portable monitor testing?
- Kryger MH. Management of obstructive sleep apnea in adults. http://www.uptodate.com/index. Accessed May 1, 2012.
- Berry RB, et al. A novel nasal expiratory positive airway pressure (EPAP) device for the treatment of obstructive sleep apnea: A randomized controlled trial. Sleep. 2011;34:479.
- Provent therapy frequently asked questions. Ventus Medical. http://www.proventtherapy.com/provent-therapy-faq.php. Accessed May 2, 2012.
- Kushida CA, et al. Practice parameters for the treatment of snoring and obstructive sleep apnea with oral appliances: An update for 2005. Sleep. 2006;29:240.
- Aurora RN, et al. Practice parameters for the surgical modifications of the upper airway for obstructive sleep apnea in adults. Sleep. 2010;33:1408.
- Badr MS. Central sleep apnea syndrome: Treatment. http://www.uptodate.com/index. Accessed May 1, 2012.
- 17. Randerath WJ, et al. Non-CPAP therapies in obstructive sleep apnoea. European Respiratory Journal. 2011;37:1000.
- Freire AO, et al. Treatment of moderate obstructive sleep apnea syndrome with acupuncture: A randomised, placebo-controlled pilot trial. Sleep Medicine. 2007;8:43.