Sleep Apnea

Sleep apnea is a breathing disorder in which the upper airway repeatedly narrows or closes during sleep, fragmenting rest and lowering the oxygen level in the blood. Its most common form is obstructive sleep apnea (OSA), which arises from a mechanical blockage at one or more levels of the airway. This is not simply “loud snoring”: left untreated, it can contribute to lasting problems such as hypertension, heart rhythm disturbances and persistent daytime sleepiness.

Summary: Sleep apnea is the repeated obstruction of the upper airway during sleep, where every pause of 10 seconds or longer counts as an “apnea”. A definitive diagnosis is made with polysomnography (a sleep study), from which the apnea–hypopnea index (AHI) is calculated and severity is graded as mild, moderate or severe. Treatment is not a single method; it is individualised by AHI, the level of obstruction and coexisting conditions, combining lifestyle changes, a CPAP device, an oral appliance or surgery. For the vibration sound without breathing pauses, see our snoring page.

Table of Contents

• What Is Sleep Apnea?
• Apnea, Hypopnea and AHI Classification
• Symptoms: Night and Day
• What Triggers Sleep Apnea?
• The Diagnostic Pathway: Polysomnography Is the Gold Standard
• Treatment Approaches: From Conservative to Surgical
• The Process and Recovery
• Quality of Life and Long-Term Follow-Up
• Sleep Apnea in Children
• Common Misconceptions
• The International Patient Pathway
• When Should a Specialist Be Consulted?
• Frequently Asked Questions
• References

What Is Sleep Apnea?

Sleep apnea is a condition in which breathing stops again and again during sleep because the upper airway becomes partially or completely blocked. The upper airway is a dynamic tube made up of the nose, nasopharynx, soft palate, uvula, tonsils, base of the tongue and the upper larynx. As the muscles relax during sleep this tube narrows, and in some people it collapses.

Any full pause lasting 10 seconds or longer is termed an apnea, while events in which airflow is reduced but not fully stopped are termed a hypopnea. In practice, apnea is grouped under three main headings:

• Obstructive apnea (OSA): The most common type. The airway closes mechanically while the chest and abdomen still make breathing efforts.
• Central apnea: The brain does not send the command to breathe, so there is no respiratory effort from the chest.
• Mixed (complex) apnea: A picture in which obstructive and central components occur together.

This page mainly addresses obstructive sleep apnea, the form most frequently seen in ear, nose and throat (ENT) practice. Simple snoring — a sound with no accompanying pauses in breathing — is a separate matter; for its causes and solutions, see our snoring page.

Apnea, Hypopnea and AHI Classification

The severity of sleep apnea is measured by the apnea–hypopnea index (AHI), the average number of apneas plus hypopneas per hour of sleep. This number, read from an objective sleep study rather than from symptoms, underpins every treatment decision — without it the line between “mild” and “severe” apnea cannot be drawn.

The AHI classification rests on established clinical thresholds:

AHI (events/hour)	Classification	General clinical approach
< 5	Normal	Non-apnea causes of snoring assessed
5 – 15	Mild apnea	Lifestyle, oral appliance; surgery in selected cases
15 – 30	Moderate apnea	CPAP first-line; appliance or surgery as options
> 30	Severe apnea	CPAP strongly prioritised; combined approach

The AHI is not the whole story. The degree of oxygen desaturation, how badly sleep is fragmented and coexisting cardiovascular disease also feed into the assessment, which is why two people with the same AHI may follow different plans.

Symptoms: Night and Day

The symptoms of sleep apnea fall into two groups — those at night and those during the day. Night-time symptoms are most often noticed by a bed partner, while daytime symptoms erode the person’s own quality of life. The number of symptoms does not always track apnea severity, so complaints alone cannot confirm a diagnosis.

Night-time symptoms

• Loud, irregular snoring
• Witnessed pauses in breathing (a partner’s description that “the breathing stops and then restarts with a gasp”)
• Waking with a sensation of choking or interrupted breathing
• Frequent changes of position and sweating
• Waking to urinate two or more times a night
• Dry mouth and a sense of reflux at night

Daytime symptoms

• Waking unrefreshed and morning headaches
• Dozing during the day, micro-sleeps in meetings or in traffic
• Difficulty with concentration and memory
• Irritability, impatience and mood swings
• Reduced libido
• An increased risk of traffic and workplace accidents

Because these complaints are common but not specific, an objective sleep study is what distinguishes apnea from its mimics.

What Triggers Sleep Apnea?

The factors that trigger sleep apnea are the anatomical and lifestyle causes that narrow the upper airway. The strongest modifiable risk factor is obesity, joined by a thick neck circumference, narrowing in the nose and throat, and certain habits. More than one of these often coexists in the same person, which is why risk assessment is the first step in planning care.

• Obesity — the strongest modifiable risk factor.
• A thick neck circumference — above 43 cm in men and 38 cm in women is a warning sign.
• Anatomical narrowing: large tonsils, enlarged adenoids, a long soft palate or uvula, a large tongue, a recessed jaw (retrognathia), a narrow upper jaw.
• Nasal obstruction: a deviated septum, turbinate hypertrophy, polyps.
• Male sex and post-menopausal women, advancing age, a family history.
• Alcohol, tobacco and sedative use — these relax the airway muscles.
• Endocrine conditions such as hypothyroidism and acromegaly.
• The supine sleeping position — in some patients this is the sole trigger (positional apnea).

Some of these triggers can be reversed through lifestyle change, whereas anatomical ones are evaluated by examination and, where needed, imaging.

The Diagnostic Pathway: Polysomnography Is the Gold Standard

A diagnosis of sleep apnea is made by combining the history, an ENT examination and an objective sleep study. Diagnosing on symptoms alone is not appropriate, because the spectrum runs from mild snoring to severe apnea. The gold standard for a definitive diagnosis is polysomnography, performed in a sleep laboratory.

1. A detailed history and screening scales. Tools such as the Epworth Sleepiness Scale and the STOP-BANG questionnaire help gauge risk.
2. ENT examination. The nose (septum, turbinates, polyps), the mouth (tonsil size, tongue position — the Mallampati score), the soft palate, uvula, tongue base and jaw structure are all assessed.
3. Sleep endoscopy (DISE). In selected cases, drug-induced sleep endoscopy shows at which level the obstruction occurs and is especially useful when surgery is being considered. For detail, see our sleep endoscopy page.
4. Polysomnography (PSG). In the sleep laboratory, brain waves (EEG), eye movements, heart rhythm, respiratory effort, airflow, blood oxygen and leg movements are recorded simultaneously. For more on this fully equipped test, see our polysomnography page.
5. The apnea–hypopnea index (AHI). Calculated from the recording, this value grades apnea as mild, moderate or severe.
6. A home portable sleep test. An alternative in selected patients, though it does not replace PSG in complex cases.
7. Supporting assessments. Where needed, cardiology (hypertension, rhythm), endocrinology (diabetes, thyroid) and neurology are involved.

In the approach to apnea, the standard practice is for the ENT physician, the respiratory (chest) physician and the sleep centre to work together, because the right treatment can only be built on an accurately measured picture.

Treatment Approaches: From Conservative to Surgical

Sleep apnea treatment cannot be reduced to a single method; it is individualised by weighing the AHI, oxygen desaturation, the anatomical level of obstruction, body weight, coexisting conditions and patient preference together. Treatment usually advances in steps: lifestyle changes form the foundation of every plan, with a device or surgery added on top, so as not merely to reduce snoring but to protect oxygenation and the integrity of sleep.

The table below summarises the general framework of the main treatment options:

Method	Generally suited to	How it is applied
Lifestyle changes	All patients (foundation layer); alone in mild apnea	Weight loss, position, alcohol/sedative limits
CPAP / APAP / BPAP	Moderate to severe obstructive apnea	Positive air pressure through a mask overnight
Oral appliance	Mild to moderate apnea; CPAP-intolerant patients	Dentist-made device advancing the lower jaw
Surgery (ENT)	Cases with a defined level of obstruction	Targeted after DISE, often multi-level
Positional therapy	Apnea that worsens only when supine	Belt or vest preventing back-sleeping

1. Lifestyle changes

Lifestyle measures form the foundation of every treatment plan and, in mild apnea, can help on their own. The single most effective measure is weight loss; a reduction of about 10% in body weight can markedly lower the AHI. To this are added avoiding sleeping on the back (in positional apnea), limiting alcohol and sedatives before bedtime, stopping smoking, keeping regular sleep hygiene and managing reflux.

2. Positive airway pressure (PAP) devices

For moderate to severe obstructive sleep apnea, PAP devices are the first-line treatment. They keep the airway pneumatically open, preventing the pauses in breathing. With correct mask selection, pressure titration and patient education, success improves markedly.

• CPAP (continuous positive pressure): the standard, most common use.
• APAP (automatically adjusting): for patients whose pressure requirement varies from night to night.
• BPAP / BiPAP (bilevel): for patients who need high pressures or who struggle to breathe out.

3. Oral appliances (mandibular advancement devices)

Oral appliances are custom-made by a dentist and widen the airway by bringing the lower jaw forward. They are an alternative in mild to moderate apnea, for patients who cannot tolerate CPAP, and particularly where snoring is the predominant feature. Their effectiveness varies with apnea severity and anatomy, so the choice of appliance is made through physician assessment.

4. Surgical treatment (the ENT perspective)

Surgery is planned after the level of obstruction has been established with sleep endoscopy (DISE), and it is usually not a single operation but a multi-level approach. The aim is to target the specific anatomical region responsible for the blockage. The main surgical options are:

• Nasal surgery (septoplasty, turbinate reduction, polyp surgery): improves CPAP tolerance; on its own it rarely resolves apnea.
• Soft palate / uvula procedures (UPPP, radiofrequency, plasma-assisted techniques).
• Tonsil surgery: particularly important in young adults and children with large tonsils.
• Tongue base procedures (radiofrequency, hypoglossal nerve stimulation in selected cases).
• Maxillomandibular advancement (MMA): the lower and upper jaws are moved forward together; reserved for selected severe cases.

The suitability, effectiveness and possible risks of surgery are assessed separately for each patient, and how predictable the outcome is depends on the level of obstruction.

This content is for informational purposes only; diagnosis and treatment require an in-person physician examination. Surgical outcomes vary from person to person.

5. Adjunctive treatments

Alongside the main treatments, some adjunctive approaches support the overall picture. Positional devices (a belt or vest that prevents back-sleeping) help only where apnea worsens when supine. Medical treatment directed at allergic rhinitis, reflux and obesity reduces upper-airway resistance. In selected patients with morbid obesity, bariatric surgery may indirectly improve apnea through weight control.

The Process and Recovery

Sleep apnea treatment is usually not a one-off intervention but a long-term management process. How it unfolds depends on the treatment chosen: adherence takes centre stage with PAP therapy, and the recovery period with surgery.

• PAP therapy: The first few weeks are a period of getting used to the mask. Mask leak, a dry mouth and a sensation of pressure are common, and most are resolved with a suitable mask and a humidifier. For success it is important to use the device for at least 4 hours each night, and ideally 6 hours or more.
• After surgery: Depending on the procedure, there may typically be a sore throat, a change in the voice or difficulty swallowing for 1–2 weeks. With multi-level surgery, recovery may extend to 3–4 weeks. Plenty of fluids, soft foods, pain control and oral hygiene matter during this period.
• Children’s operations: Recovery usually occurs within 7–10 days, and the disappearance of snoring and restless night-time sleep within a short period is a common observation.

Recovery times vary from person to person and with the procedure performed.

Quality of Life and Long-Term Follow-Up

Untreated sleep apnea is not merely a matter of waking up tired; over the long term it raises important health risks, so apnea is managed for both quality of life and long-term health. Regular follow-up is the key to sustaining the benefit of treatment.

Risks that untreated apnea increases over the long term include:

• Hypertension, particularly the treatment-resistant type
• Coronary heart disease and heart failure
• Atrial fibrillation and night-time rhythm disturbances
• Stroke
• Type 2 diabetes and metabolic syndrome
• Traffic and workplace accidents
• Depression and cognitive decline

With the correct treatment, the changes that may be expected include greater daytime energy, fewer morning headaches, easier control of blood pressure and blood sugar, less night-time urination and an improvement in mood. The degree of these improvements varies from person to person.

Long-term follow-up is recommended to include:

• Repeating the sleep study when symptoms change or as required
• For those using a PAP device, reviewing the adherence data (hours per night, device AHI) with the physician
• Parallel management of weight, alcohol, sedative use and coexisting conditions
• Where surgery has been performed, a post-operative follow-up sleep study

Sleep Apnea in Children

Sleep apnea in children differs in important ways from the adult form, and overlooking it can seriously affect a child’s development. The most common cause of apnea in children is enlarged adenoids and large tonsils. Obesity, allergic rhinitis, a narrow upper jaw and some craniofacial syndromes make up the other risk factors.

Sleep apnea should be considered in a child when the following are present:

• Loud snoring and irregular breathing at night
• Sleeping with the mouth open, frequent changes of position, sweating
• Bed-wetting beyond the age-appropriate stage
• Morning headaches, waking listless
• Excessive daytime sleepiness or, conversely, hyperactivity and inattention
• A decline in school performance and problems with concentration
• Problems with growth and weight gain
• Signs of facial and jaw development such as a long face and a narrow upper jaw

In children with apnea, removing the adenoids and tonsils (adenoidectomy ± tonsillectomy) produces a large improvement in most cases. Where obesity coexists, weight management and, if necessary, positive airway pressure therapy are introduced. Early diagnosis is critically important for the child’s growth, behaviour and facial and jaw development.

Common Misconceptions

Several widespread but mistaken beliefs about sleep apnea delay diagnosis and treatment. The points below correct the most common ones.

• “If I snore, I must have apnea.” Not every instance of snoring means apnea; but persistent snoring should always be assessed. To tell simple snoring from apnea, see our snoring page.
• “You cannot get used to CPAP.” With correct mask selection, pressure titration and support for adherence, the great majority do adapt.
• “I have apnea but I’m not tired during the day, so there’s no need.” The cardiovascular and metabolic effects of apnea can develop even without sleepiness; treatment is undertaken not only for comfort but for long-term health.
• “Snoring is natural as you get older.” Snoring does increase with age, but obstructive apnea cannot be regarded as natural.

The International Patient Pathway

For patients travelling to Istanbul, the assessment of sleep apnea can begin before the journey. The pathway focuses on planning and continuity of care, not on packages.

• Online pre-consultation. An initial video consultation reviews symptoms, history and the reason for referral, and clarifies what information will be needed.
• Records review. Any existing sleep study, ENT reports and imaging are shared and reviewed in advance, so the in-person visit is used efficiently.
• Planning the Istanbul visit. The steps that require attendance — the ENT examination, and where indicated polysomnography or sleep endoscopy — are scheduled together to reduce the number of separate trips.
• Remote follow-up. After treatment, adherence data and progress can be reviewed remotely, with local coordination where a device or ongoing monitoring is involved.

A definitive plan is always confirmed by an in-person examination; the pre-consultation prepares that visit rather than replacing it.

When Should a Specialist Be Consulted?

A consultation with an ENT or sleep physician is warranted if any of the following applies. These signs can indicate that apnea is progressing silently, and early assessment reduces long-term risk.

• Loud, irregular snoring together with witnessed pauses in breathing
• Waking with a sensation of choking
• Daytime sleepiness and waking unrefreshed lasting longer than six months
• Dozing or micro-sleep episodes in traffic or at work
• Treatment-resistant hypertension or atrial fibrillation
• Obesity combined with loud snoring
• In a child, restless sleep at night, sleeping with the mouth open, persistent snoring and a decline in school performance
• A return of symptoms after previous treatment for apnea

Sleep apnea is a condition that progresses silently yet can have serious cardiovascular, metabolic and cognitive consequences. With early diagnosis and the correct stepwise treatment, the great majority can be managed safely.

Frequently Asked Questions

Is a sleep study essential?

Yes. Polysomnography (a sleep study) is the gold standard for diagnosis. The apnea–hypopnea index (AHI) and the oxygen drops that occur through the night are measured with this test. Because the choice of treatment rests directly on that objective data, a reliable diagnosis and plan cannot be built without a sleep study. In selected patients, a home portable test may be an alternative.

Can sleep apnea be cured?

Obstructive sleep apnea is a treatable condition. In mild cases, weight loss and lifestyle changes may produce a marked improvement; in moderate to severe cases, CPAP, an oral appliance or surgery brings the apnea under control. The degree of response depends on the cause, the severity and any coexisting conditions, and varies from person to person.

Does sleep apnea last a lifetime?

In some patients, weight loss or suitable surgery can resolve the picture, while others need long-term management. The factors that determine whether it persists are the cause, the severity and coexisting conditions. For this reason the answer is specific to each person and becomes clear through regular physician follow-up.

What triggers sleep apnea?

Obesity and a thick neck circumference are the strongest triggers. Added to these are anatomical narrowing in the nose and throat (large tonsils, enlarged adenoids, a deviated septum), a recessed jaw, the use of alcohol and sedatives, smoking, advancing age and the supine sleeping position. These factors often occur together in the same person.

Is a CPAP device used for life?

In moderate to severe apnea, CPAP is often used long-term because it holds the airway mechanically open, and the apnea usually returns if the device is stopped. With weight loss or suitable surgery, the need may lessen in some patients. That decision is made from the result of a follow-up sleep study rather than by assumption.

What is the difference between simple snoring and sleep apnea?

Simple snoring is the sound produced by vibration in the upper airway without any pause in breathing. In sleep apnea, that snoring is accompanied by repeated pauses in breathing and drops in oxygen. If there are witnessed pauses, waking with a sensation of choking or marked daytime sleepiness, a sleep study is needed. For snoring on its own, see our snoring page.

References

• American Academy of Sleep Medicine (AASM)
• National Heart, Lung, and Blood Institute (NHLBI)
• PubMed / U.S. National Library of Medicine
• MedlinePlus (U.S. National Library of Medicine)