By Mayo Clinic staff
Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts. You may have sleep apnea if you snore loudly and you feel tired even after a full night's sleep.
Sleep apnea occurs in two main types:
Obstructive sleep apnea, the more common form that occurs when throat muscles relax
Central sleep apnea, which occurs when your brain doesn't send proper signals to the muscles that control breathing
Additionally, some people have complex sleep apnea, which is a combination of both.
If you think you might have sleep apnea, see your doctor. Treatment is necessary to avoid heart problems and other complications.
Types of sleep apnea
Obstructive sleep apnea is the most common type of sleep apnea. It occurs when the soft tissue in the back of your throat relaxes during sleep, causing a blockage of the airway (as well as loud snoring).
Central sleep apnea is a much less common type of sleep apnea that involves the central nervous system, rather than an airway obstruction. It occurs when the brain fails to signal the muscles that control breathing. People with central sleep apnea seldom snore.
Complex sleep apnea is a combination of obstructive sleep apnea and central sleep apnea.
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 and the tongue.
When the muscles relax, your airway narrows or closes as you breathe in, and breathing momentarily stops. 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 do not remember it.
You can awaken with a transient shortness of breath that corrects itself quickly, within one or two deep breaths, although this is rare. 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 will feel sleepy during your waking hours.
People with obstructive sleep apnea may not be aware that their sleep was interrupted. In fact, many 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 or staying asleep. Like with obstructive sleep apnea, snoring and daytime sleepiness can occur. The most common cause of central sleep apnea is heart disease and, less commonly, a stroke. People with central sleep apnea may be more likely to remember awakening than are people with obstructive sleep apnea.
Causes of complex sleep apnea
People with complex sleep apnea have upper airway obstruction just like those with obstructive sleep apnea, but they also have a problem with the rhythm of breathing and occasional lapses of breathing effort.
o Loud and chronic snoring
o Choking, snorting, or gasping during sleep
o Long pauses in breathing
o Daytime sleepiness, no matter how much time you spend in bed
o Other common signs and symptoms of sleep apnea include:
o Waking up with a dry mouth or sore throat
o Morning headaches
o Restless or fitful sleep
o Insomnia or nighttime awakenings
o Going to the bathroom frequently during the night
o Waking up feeling out of breath
o Forgetfulness and difficulty concentrating
o Moodiness, irritability, or depression
The signs and symptoms of obstructive and central sleep apneas overlap, sometimes making the type of sleep apnea more difficult to determine.
Consult a medical professional if you experience, or if your partner observes, the following:
1. Snoring loud enough to disturb the sleep of others or yourself
2. Shortness of breath that awakens you from sleep
3. Intermittent pauses in your breathing during sleep
4. Excessive daytime drowsiness, which may cause you to fall asleep while you're working, watching television or even driving
Many people do not think of snoring as a sign of something potentially serious, and not everyone who has sleep apnea snores. Talk to your doctor if you experience loud snoring, especially snoring tthat is punctuated by periods of silence.
Ask your doctor about any sleep problem that leaves you chronically fatigued, sleepy and irritable. Excessive daytime drowsiness (hypersomnia) may be due to other disorders, such as narcolepsy.
Sleep apnea is a serious medical condition. Complications may include:
Cardiovascular problems. Sudden drops in blood oxygen levels that occur during sleep apnea increase blood pressure and strain the cardiovascular system. If you have obstructive sleep apnea, your risk of high blood pressure (hypertension) can be up to two to three times greater than if you don't. The more severe your sleep apnea, the greater the risk of high blood pressure. However, obstructive sleep apnea increases the risk of stroke, regardless of whether or not you have high blood pressure. If there is underlying heart disease, these multiple episodes of low blood oxygen (hypoxia or hypoxemia) can lead to sudden death from a cardiac event. Studies also show that obstructive sleep apnea is associated with increased risk of atrial fibrillation, congestive heart failure and other vascular diseases.
In contrast, central sleep apnea usually is the result, rather than the cause, of heart disease.
Daytime fatigue. The repeated awakenings associated with sleep apnea make normal, restorative sleep impossible. People with sleep apnea often experience severe daytime drowsiness, fatigue and irritability. You may have difficulty concentrating and find yourself falling asleep at work, while watching TV or even when driving. You may also feel irritable, moody or depressed. Children and adolescents with sleep apnea may do poorly in school or have behavior problems.
Complications with medications and surgery. Obstructive sleep apnea is also a concern with certain medications and general anesthesia. People with sleep apnea may be more likely to experience complications following major surgery because they're prone to breathing problems, especially when sedated and lying on their backs. Before you have surgery, tell your doctor that you have sleep apnea and how it's treated. Undiagnosed sleep apnea is especially risky in this situation.
Sleep-deprived partners. Loud snoring can keep those around you from getting good rest and eventually disrupt your relationships. It is not uncommon for a partner to go to another room, or even on another floor of the house, to be able to sleep. Many bed partners of people who snore are sleep deprived as well.
People with sleep apnea may also complain of memory problems, morning headaches, mood swings or feelings of depression, a need to urinate frequently at night (nocturia), and impotence.
Gastroesophageal reflux disease (GERD) may be more prevalent in people with sleep apnea.
Children with untreated sleep apnea may be hyperactive and may be diagnosed with attention-deficit/hyperactivity disorder (ADHD).
While a diagnosis of sleep apnea can be scary, it is a treatable condition. In fact, there are many things you can do on your own to help, particularly for mild to moderate sleep apnea. Home remedies and lifestyle modifications can go a long way in reducing sleep apnea symptoms.
Lifestyle changes that can help sleep apnea
Bedtime tips for preventing sleep apnea
Throat exercises to reduce sleep apnea
Studies show that throat exercises may reduce the severity of sleep apnea by strengthening the muscles in airway, making them less likely to collapse.
Several inpatient and outpatient procedures use sedation. Many drugs and agents used during surgery to relieve pain and to depress consciousness remain in the body at low amounts for hours or even days afterwards. In an individual with either central, obstructive or mixed sleep apnea, these low doses may be enough to cause life-threatening irregularities in breathing or collapses in a patient’s airways. Use of analgesics and sedatives in these patients postoperatively should therefore be minimized or avoided.
Surgery on the mouth and throat, as well as dental surgery and procedures, can result in postoperative swelling of the lining of the mouth and other areas that affect the airway. Even when the surgical procedure is designed to improve the airway, such as tonsillectomy and adenoidectomy or tongue reduction, swelling may negate some of the effects in the immediate postoperative period. Once the swelling resolves and the palate becomes tightened by postoperative scarring, however, the full benefit of the surgery may be noticed.
Sleep apnea patients undergoing any medical treatment must make sure his or her doctor and/or anesthetist are informed about their condition. Alternate and emergency procedures may be necessary to maintain the airway of sleep apnea patients. If an individual suspects he or she may have sleep apnea, communication with their doctor about possible preprocedure screening may be in order.
CPAP is the most consistently safe and effective treatment for obstructive sleep apnea but it is not a cure, and people are less likely to use it in the long term. The Stanford Center for Excellence in Sleep Disorders Medicine achieved a 95% cure rate of sleep apnea patients by surgery. Maxillomandibular advancement (MMA) is considered the most effective surgery for sleep apnea patients, because it increases the posterior airway space (PAS). The main benefit of the operation is that the oxygen saturation in the arterial blood increases. In a study published in 2008, 93.3.% of surgery patients achieved an adequate quality of life. Surgery led to a significant increase in general productivity, social outcome, activity level, vigilance, intimacy and sex. Overall risks of MMA surgery are low: The Stanford University Sleep Disorders Center found 4 failures in a series of 177 patients, or about one out of 44 patients. However, health professionals are often unsure as to who should be referred for surgery and when to do so: some factors in referral may include failed use of CPAP or device use; anatomy which favors rather than impeding surgery; or significant craniofacial abnormalities which hinder device use
A 2005 study in the British Medical Journal found that learning and practicing the didgeridoo helped reduce snoring and sleep apnea as well as daytime sleepiness. This appears to work by strengthening muscles in the upper airway, thus reducing their tendency to collapse during sleep.
A 2009 study published in the American Journal of Respiratory and Clinical Care Medicine found that "oropharyngeal exercises derived from speech therapy may be an effective treatment option for patients with moderate" obstructive sleep apnea ,
Continuous Positive Airflow Pressure (CPAP) for sleep apnea
Continuous Positive Airflow Pressure, or CPAP for short, is the gold standard treatment for moderate to severe obstructive sleep apnea. In many cases, you’ll experience immediate symptom relief and a huge boost in your mental and physical energy. The CPAP device is a mask-like machine that provides a constant stream of air which keep your breathing passages open while you sleep. Most CPAP devices are the size of a tissue box.
If you have given up on sleep apnea machines in the past because of discomfort, you owe it to yourself to give them a second look. CPAP technology is constantly being updated and improved. The new CPAP devices are lighter, quieter, and more comfortable, so make sure your sleep apnea device is up to date.
Dental devices and surgery for sleep apnea
If you have tried CPAP and self-help tips and your sleep apnea persists, you may benefit from a dental device or surgical treatment.
Dental devices for sleep apnea
Most dental devices are acrylic and fit inside your mouth, much like an athletic mouth guard. Others fit around your head and chin to adjust the position of your lower jaw. Two common oral devices are themandibular repositioning device and the tongue retaining device. These devices open your airway by bringing your lower jaw or your tongue forward during sleep.
Dental devices are only effective for mild to moderate sleep apnea. There are also a number of troubling side effects from using this type of treatment, including soreness, saliva build-up, nausea, and damage or permanent change in position of the jaw, teeth, and mouth.
It is very important to get fitted by a dentist specializing in sleep apnea, and to see the dentist on a regular basis for any dental problems that may occur.
One preclinical study is cited in the scientific literature investigating the role of cannabinoids on sleep-related apnea. Writing in the June 2002 issue of the journal of the American Academy of Sleep Medicine, researchers at the University of Illinois (at Chicago) Department of Medicine reported "potent suppression" of sleep-related apnea in rats administered either exogenous or endogenous cannabinoids. Investigators reported that doses of delta-9-THC and the endocannabinoid oleamide each stabilized respiration during sleep and blocked serotonin-induced exacerbation of sleep apnea in a statistically significant manner. No follow up investigations have taken place assessing the use of cannabinoids to treat this indication. However, several recent preclinical and clinical trials have reported on the use of THC, natural cannabis extracts and endocannabinoids to induce sleep and/or improve sleep quality.
Functional role for Cannabinoids in respiratory stability during sleep.
Carley DW, Paviovic S, Janelidze M, Radulovacki M.
Department of Medicine, University of Illinois at Chicago, 60612, USA.
STUDY OBJECTIVES: Serotonin, acting in the peripheral nervous system,
can exacerbate sleep-related apnea, and systemically administered
serotonin antagonists reduce sleep-disordered respiration in rats and
bulldogs. Because Cannabinoid receptor agonists are known to inhibit
the excitatory effects of serotonin on nodose ganglion cells, we examined
the effects of endogenous (oleamide) and exogenous
(delta9-tetrahydrocannabinol; delta9THC) cannabimimetic agents on
DESIGN: Sleep architecture, respiratory pattern,
and apnea expression in rats were assessed by polysomnography. A
repeated measures, within-subjects, fully nested crossover design was
used in which each animal was recorded on exactly 12 occasions.
PARTICIPANTS: Eleven adult male Sprague-Dawley rats were instrumented
for chronic polysomnography.
INTERVENTIONS: Animals were recorded
following intraperitoneal injection of various doses of delta9THC,
oleamide, and serotonin, alone and in combination.
RESULTS: Our data show that delta9THC and oleamide each stabilized
respiration during all sleep stages. With delta9THC, apnea index
decreased by 42% (F=2.63; p=0.04) and 58% (F=2.68; p=0.04) in NREM and
REM sleep, respectively. Oleamide produced equivalent apnea
This observation suggests an important role for endocannabinoids in
maintaining autonomic stability during sleep. Oleamide and delta9THC
blocked serotonin-induced exacerbation of sleep apnea (p<0.05 for
each), suggesting that inhibitory coupling between Cannabinoids and serotonin
receptors in the peripheral nervous system may act on apnea expression.
CONCLUSIONS: This study demonstrates potent suppression of
sleep-related apnea by both exogenous and endogenous Cannabinoids.
These findings are of relevance to the pathogenesis
and pharmacological treatment of sleep-related breathing disorders.
Recommendation: Whole plant extracts, tinctures.
Sativa x Indica hybrid
 Carley et al. 2002. Functional role for cannabinoids in respiratory stability during sleep. Sleep 25: 399-400.
 Murillo-Rodriguez et al. 2003. Anandamide enhances extracellular levels of adenosine and induces sleep: an in vivo micro dialysis study. Sleep 26: 943-947.
 Nicholson et al. 2004. Effect of delta-9-tetrahydrocannabinol and cannabidiol on nocturnal sleep and early-morning behavior in young adults. Journal of Clinical Pharmacology 24: 305-313.
 Christine Perras. 2005. Sativex for the management of multiple sclerosis symptoms. Issues in Emerging Health Technologies 72: 1-4
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