Snoring

"Snore" redirects here. For other uses, see Snore (disambiguation).

For the villages in Norfolk, England, see Little Snoring and Great Snoring.

Snoring
File:Schnarchen 01.ogg Sound sample of snoring
Classification and external resources
Specialty	Otorhinolaryngology, sleep medicine
ICD-10	R06.5
ICD-9-CM	786.09
DiseasesDB	12260
MedlinePlus	003207
Patient UK	Snoring
MeSH	D012913

Snoring is the vibration of respiratory structures and the resulting sound due to obstructed air movement during breathing while sleeping. In some cases, the sound may be soft, but in most cases, it can be loud and unpleasant. Snoring during sleep may be a sign, or first alarm, of obstructive sleep apnea (OSA). Researchers say that snoring is a factor of sleep deprivation.

Signs and symptoms

Snoring is known to cause sleep deprivation to snorers and those around them, as well as daytime drowsiness, irritability, lack of focus and decreased libido. It has also been suggested that it can cause significant psychological and social damage to sufferers. Multiple studies reveal a positive correlation between loud snoring and risk of heart attack (about +34% chance) and stroke (about +67% chance).

Though snoring is often considered a minor affliction, snorers can sometimes suffer severe impairment of lifestyle. The between-subjects trial by Armstrong et al. discovered a statistically significant improvement in marital relations after snoring was surgically corrected. This was confirmed by evidence from Gall et al., Cartwright and Knight and Fitzpatrick et al.

New studies associate loud "snoring" with the development of carotid artery atherosclerosis. Amatoury et al. demonstrated that snoring vibrations are transmitted to the carotid artery, identifying a possible mechanism for snoring-associated carotid artery damage and atherosclerotic plaque development. These researchers also found amplification of the snoring energy within the carotid lumen at certain frequencies, adding to this scenario. Vibration of the carotid artery with snoring also lends itself as a potential mechanism for atherosclerotic plaque rupture and consequently ischemic stroke. Researchers also hypothesize that loud snoring could create turbulence in carotid artery blood flow. Generally speaking, increased turbulence irritates blood cells and has previously been implicated as a cause of atherosclerosis.

A U.S. study estimates that roughly one in every 15 Americans is affected by at least a moderate degree of sleep apnea.

Causes

Generally speaking, the structures involved are the uvula and soft palate. The irregular airflow is caused by a passageway blockage and is usually due to one of the following:

• Throat weakness, causing the throat to close during sleep.
• Mispositioned jaw, often caused by tension in the muscles.
• Fat gathering in and around the throat.
• Obstruction in the nasal passageway.
• Obstructive sleep apnea.
• The tissues at the top of airways touching each other, causing vibrations.
• Relaxants such as alcohol or other drugs relaxing throat muscles.
• Sleeping on one's back, which may result in the tongue dropping to the back of the mouth.

Treatment

Almost all treatments for snoring revolve around clearing the blockage in the breathing passage. This is the reason snorers are advised to lose weight (to stop fat from pressing on the throat), stop smoking (smoking weakens and clogs the throat) and sleep on their side (to prevent the tongue from blocking the throat). A number of other treatment options are also available, ranging from over-the-counter aids such as nasal sprays, nasal strips or nose clips, lubricating sprays, oral appliances and "anti-snore" clothing and pillows, to such unusual activities as playing the didgeridoo. Specially designed laser treatments can also be used to reduce the inflammation and elevate the soft palate and uvula.

Dental appliances

One style of mandibular advancement splint

Specially made dental appliances called mandibular advancement splints, which advance the lower jaw slightly and thereby pull the tongue forward, are a common mode of treatment for snoring. Such appliances have been proven to be effective in reducing snoring and sleep apnea in cases where the apnea is mild to moderate. Mandibular advancement splints are often tolerated much better than CPAP machines.

Positive airway pressure

Main article: Positive airway pressure

A continuous positive airway pressure (CPAP) machine is often used to control sleep apnea and the snoring associated with it. To keep the airway open, a device pumps a controlled stream of air through a flexible hose to a mask worn over the nose, mouth, or both.

Surgery

Surgery is also available as a method of correcting social snoring. Some procedures, such as uvulopalatopharyngoplasty, attempt to widen the airway by removing tissues in the back of the throat, including the uvula and pharynx. These surgeries are quite invasive, however, and there are risks of adverse side effects. The most dangerous risk is that enough scar tissue could form within the throat as a result of the incisions to make the airway more narrow than it was prior to surgery, diminishing the airspace in the velopharynx. Scarring is an individual trait, so it is difficult for a surgeon to predict how much a person might be predisposed to scarring. Currently, the American Medical Association does not approve of the use of lasers to perform operations on the pharynx or uvula.

Radiofrequency ablation (RFA) is a relatively new surgical treatment for snoring. This treatment applies radiofrequency energy and heat (between 77 °C and 85 °C) to the soft tissue at the back of the throat, such as the soft palate and uvula, causing scarring of the tissue beneath the skin. After healing, this results in stiffening of the treated area. The procedure takes less than one hour, is usually performed on an outpatient basis, and usually requires several treatment sessions. Radiofrequency ablation is frequently effective in reducing the severity of snoring, but often does not completely eliminate it.

Bipolar radiofrequency ablation, a technique used for coblation tonsillectomy, is also used for the treatment of snoring.

Pillar procedure

The Pillar Procedure is a minimally invasive treatment for snoring and obstructive sleep apnea. This procedure was FDA indicated in 2004. During this procedure, three to six+ dacron (the material used in permanent sutures) strips are inserted into the soft palate, using a modified syringe and local anesthetic. While the procedure was initially approved for the insertion of three "pillars" into the soft palate, it was found that there was a significant dosage response to more pillars, with appropriate candidates. As a result of this outpatient operation, which typically lasts no more than 30 minutes, the soft palate is more rigid, possibly reducing instances of sleep apnea and snoring. This procedure addresses one of the most common causes of snoring and sleep apnea — vibration or collapse of the soft palate (the soft part of the roof of the mouth). If there are other factors contributing to snoring or sleep apnea, such as conditions of the nasal airway or an enlarged tongue, it will likely need to be combined with other treatments to be more effective.

Medication

An open label non-randomized study in 30 patients found benefit from pseudoephedrine, domperidone, and the combination in the treatment of severe snoring.

Alternative medicine

Among the 'natural' remedies are exercises to increase the muscle tone of the upper airway, and one medical practitioner noting anecdotally that professional singers seldom snore, but sufficient study of this area remains to be undertaken.

Epidemiology

Statistics on snoring are often contradictory, but at least 30% of adults and perhaps as many as 50% of people in some demographics snore. One survey of 5,713 American residents identified habitual snoring in 24% of men and 13.8% of women, rising to 60% of men and 40% of women aged 60 to 65 years; this suggests an increased susceptibility to snoring as age increases.

See also

• Sleep apnea
• Somnoplasty