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Apnea – Causes, Symptoms and Treatment

Apnea refers to a temporary cessation of breathing that can occur during sleep or while awake. It is closely linked to sleep apnea and can lead to serious health consequences if left untreated.

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Things worth knowing about "Apnea"

Apnea refers to a temporary cessation of breathing that can occur during sleep or while awake. It is closely linked to sleep apnea and can lead to serious health consequences if left untreated.

What is Apnea?

Apnea (from the Greek apnoia, meaning breathlessness) is defined as a complete, temporary stop in breathing lasting more than ten seconds. It can occur during sleep or while a person is awake and must be distinguished from hypopnea, in which breathing becomes shallow but does not stop entirely. Apnea episodes may occur occasionally or repeatedly and are often part of a more serious medical condition known as sleep apnea syndrome.

Types of Apnea

Obstructive Apnea

Obstructive apnea is the most common form. It occurs when the muscles at the back of the throat relax during sleep, causing the upper airway to become blocked. The brain continues to send breathing signals, but air cannot flow freely. Loud snoring followed by silent pauses and sudden gasping or choking are characteristic signs.

Central Apnea

In central apnea, there is no physical airway blockage. Instead, the brain temporarily fails to send the appropriate signals to the breathing muscles. This form is more commonly associated with heart failure, stroke, or the use of certain medications such as opioids.

Mixed Apnea

Mixed apnea is a combination of both types, typically beginning as central apnea before transitioning into an obstructive pattern.

Causes

Excess body weight and obesity
Anatomical factors (e.g., narrow airway, enlarged tonsils, recessed jaw)
Alcohol consumption and use of sedatives or sleeping pills
Smoking
Neurological conditions (e.g., stroke, Parkinson disease)
Heart failure
Family history and genetic predisposition

Symptoms

Loud snoring with audible breathing pauses
Excessive daytime sleepiness and fatigue
Morning headaches
Difficulty concentrating and memory problems
Mood changes and irritability
Night sweats
Frequent nighttime awakenings or need to urinate

Diagnosis

The diagnosis of sleep apnea is typically confirmed through an overnight polysomnography study conducted in a sleep laboratory. This test records brain activity, heart rate, blood oxygen levels, airflow, and body movements throughout the night. A simplified home sleep test (polygraphy) may also be used as an initial screening tool. The Apnea-Hypopnea Index (AHI) quantifies the average number of breathing interruptions per hour of sleep and is the key measure for determining disease severity.

Treatment

CPAP Therapy

The most effective and widely used treatment for obstructive sleep apnea is CPAP therapy (Continuous Positive Airway Pressure). A mask worn over the nose and/or mouth delivers a continuous stream of pressurized air to keep the airway open during sleep.

Mandibular Advancement Devices

For mild to moderate sleep apnea, mandibular advancement devices (MADs) can be an effective alternative. These custom-fitted oral appliances gently push the lower jaw forward, helping to keep the airway open.

Surgical Options

In cases where anatomical abnormalities contribute to airway obstruction, surgical procedures such as uvulopalatopharyngoplasty (UPPP) or tonsillectomy may be considered.

Lifestyle Changes

Weight loss in overweight individuals
Avoiding alcohol and sedative medications
Quitting smoking
Sleeping on the side rather than on the back

Risks and Complications

Untreated sleep apnea significantly increases the risk of high blood pressure, cardiac arrhythmias, heart attack, and stroke. It is also associated with an increased risk of type 2 diabetes, depression, and traffic accidents due to daytime sleepiness. Early diagnosis and consistent treatment are therefore essential for long-term health.

References

American Academy of Sleep Medicine (AASM): Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea. Journal of Clinical Sleep Medicine (2017). Available at: www.aasm.org
World Health Organization (WHO): Sleep disorders and sleep deprivation. Geneva: WHO Press.
Punjabi NM: The Epidemiology of Adult Obstructive Sleep Apnea. Proceedings of the American Thoracic Society, 5(2):136-143 (2008). PubMed PMID: 18250205.

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