Obstructive Sleep Apnea (OSA)
A serious sleep disorder where breathing repeatedly stops and starts due to blocked upper airways during sleep.
What is Obstructive Sleep Apnea (OSA)?
Obstructive Sleep Apnea (OSA) is the most common type of sleep apnea, occurring when the muscles in the back of your throat relax too much during sleep. This relaxation causes the airway to narrow or close as you breathe in, which can lower the oxygen level 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 might snort, choke, or gasp. This pattern can repeat itself 5 to 30 times or more each hour, all night long, impairing your ability to reach the deep, restful phases of sleep.
Prevalence
OSA affects approximately 2-9% of adults in the general population, though many cases remain undiagnosed. It is more common in men, older adults, and those who are overweight. An estimated 80-90% of adults with OSA remain undiagnosed.
Causes
The primary cause is the relaxation of throat muscles during sleep, but several factors increase risk: excess weight (fat deposits around the upper airway can obstruct breathing), neck circumference (thicker necks may have narrower airways), a narrowed airway (inherited or from enlarged tonsils/adenoids), being male, older age, family history, use of alcohol or sedatives, smoking, nasal congestion, and medical conditions such as congestive heart failure, high blood pressure, type 2 diabetes, and Parkinson's disease.
Types
Mild OSA
5-15 apnea events per hour of sleep. May cause mild daytime sleepiness.
Moderate OSA
15-30 apnea events per hour of sleep. Notable impact on sleep quality and daytime function.
Severe OSA
More than 30 apnea events per hour. Significant health risks and marked daytime impairment.
Symptoms
Loud snoring
Loud, chronic snoring is one of the most common signs of OSA. Snoring is caused by air squeezing through the narrowed or blocked airway.
Episodes of stopped breathing
Your bed partner may notice periods where you stop breathing during sleep, often followed by gasping or choking sounds.
Gasping for air during sleep
You may awaken abruptly with shortness of breath or a choking sensation as your body reacts to blocked airways.
Morning headache
Frequent morning headaches result from lower oxygen levels and disrupted sleep patterns during the night.
Excessive daytime sleepiness
Despite spending adequate time in bed, you feel excessively tired during the day due to fragmented, poor-quality sleep.
Difficulty concentrating
Sleep deprivation from OSA can impair cognitive function, making it hard to focus, remember things, or make decisions.
Mood changes
Irritability, depression, or mood swings are common due to chronic sleep disruption affecting emotional regulation.
Dry mouth upon awakening
Breathing through the mouth during sleep (common with blocked nasal passages) leads to a dry mouth in the morning.
Diagnosis
Self-Assessment Questions
If you answer yes to any of these questions, consider consulting a sleep specialist:
- 1Do you snore loudly enough to disturb your partner or others nearby?
- 2Has anyone observed you stop breathing, gasp, or choke during sleep?
- 3Do you wake up feeling unrefreshed despite getting enough hours of sleep?
- 4Do you experience excessive daytime sleepiness or fall asleep unintentionally during the day?
- 5Do you have high blood pressure or are you being treated for it?
Diagnosing OSA typically involves a comprehensive sleep evaluation. Your doctor will review your symptoms, medical history, and may have you complete a sleep questionnaire. The gold standard for diagnosis is a sleep study.
Polysomnography (Sleep Study)
An overnight sleep study conducted at a sleep center where you're hooked up to equipment that monitors your heart, lung, and brain activity, breathing patterns, arm and leg movements, and blood oxygen levels while you sleep.
Home Sleep Apnea Test (HSAT)
A simplified version of polysomnography that can be done at home. It typically measures airflow, breathing effort, blood oxygen levels, and sometimes heart rate or snoring.
Apnea-Hypopnea Index (AHI)
The key measurement from sleep studies that counts the number of apneas (complete breathing cessation) and hypopneas (partial breathing reduction) per hour of sleep.
Treatment
Treatment for OSA aims to normalize breathing during sleep and eliminate snoring and daytime sleepiness. The approach depends on severity and may involve lifestyle changes, devices, or surgery.
Continuous Positive Airway Pressure (CPAP)
The most common and reliable treatment. A machine delivers air pressure through a mask while you sleep, keeping your upper airway passages open to prevent apnea and snoring.
Bilevel Positive Airway Pressure (BiPAP)
Similar to CPAP but provides different pressure levels for inhalation and exhalation. Often used for patients who have difficulty with CPAP or have central sleep apnea.
Oral Appliances
Custom-fitted dental devices that reposition the lower jaw and tongue to keep the airway open. Best for mild to moderate OSA or those who cannot tolerate CPAP.
Upper Airway Surgery
Various surgical procedures can remove or shrink tissue, reposition the jaw, or implant devices to prevent airway collapse. Options include UPPP, maxillomandibular advancement, and hypoglossal nerve stimulation.
Hypoglossal Nerve Stimulation (Inspire)
An implanted device that stimulates the nerve controlling tongue movement, keeping the airway open during sleep. Approved for moderate to severe OSA in patients who cannot use CPAP.
Lifestyle Adjustments
- •Lose excess weight - even a 10% weight loss can significantly reduce OSA severity
- •Exercise regularly - aim for at least 30 minutes of moderate activity most days
- •Avoid alcohol and sedatives, especially before bedtime
- •Sleep on your side rather than your back to prevent tongue and soft tissues from blocking the airway
- •Quit smoking - smoking increases inflammation and fluid retention in the upper airway
- •Treat nasal allergies to improve airflow through the nose
- •Maintain a regular sleep schedule
Patient Support Resources
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