Central Sleep Apnea: Causes, Diagnosis, and Treatment

Central sleep apnea is a sleep-related breathing disorder in which breathing repeatedly stops and starts because the brain does not consistently send the proper signals to the breathing muscles. Although it can feel concerning, the condition is treatable, and careful evaluation can help identify both the breathing pattern and any underlying medical cause.

Overview

Central sleep apnea is a disorder in which breathing repeatedly slows or stops during sleep because the brain temporarily does not send steady signals to the muscles that control breathing. These pauses are usually brief, but they may happen many times during the night and can disturb normal sleep patterns.

It is different from obstructive sleep apnea, where breathing stops because the upper airway becomes physically narrowed or blocked. In central sleep apnea, the airway may remain open, but the effort to breathe decreases or pauses. Some people can have a mixed pattern with features of both central and obstructive events.

Central sleep apnea is less common than obstructive sleep apnea, but it is important because it can be linked to underlying medical conditions such as heart failure, stroke, neurological disorders, use of opioid medicines, or sleeping at high altitude. In some cases, it appears during treatment for obstructive sleep apnea, which is sometimes called treatment-emergent central sleep apnea.

Because symptoms can overlap with other sleep problems, a proper evaluation is important. Once the cause is identified, treatment can often improve sleep quality, daytime alertness, and overall health.

Symptoms

The symptoms of central sleep apnea can vary from person to person. Some people notice poor sleep and daytime fatigue, while others first learn about the condition because a bed partner sees pauses in breathing during sleep. The pattern may be subtle, and not everyone snores loudly.

Common symptoms can include waking up during the night, sudden shortness of breath, restless or unrefreshing sleep, morning headaches, difficulty concentrating, irritability, and excessive daytime sleepiness. Some people also report insomnia or frequent awakenings without knowing why.

Symptoms may depend partly on the underlying cause. For example, people with heart conditions may notice nighttime breathing changes along with swelling, exercise intolerance, or shortness of breath when lying flat. People with neurological disorders may have additional symptoms related to the brain or nervous system.

• Witnessed pauses in breathing during sleep
• Frequent awakenings or fragmented sleep
• Daytime tiredness or sleepiness
• Morning headaches
• Trouble focusing or memory difficulties
• Waking with a feeling of breathlessness

Causes and Risk Factors

Central sleep apnea develops when the normal control of breathing becomes unstable during sleep. Breathing is normally regulated automatically by the brain, based in part on carbon dioxide and oxygen levels in the blood. If this control system becomes overly sensitive or impaired, breathing can alternate between overbreathing and underbreathing, leading to repeated pauses.

Several medical conditions can contribute. Heart failure is a well-known cause, especially when breathing follows a waxing and waning pattern called Cheyne-Stokes respiration. Stroke, brainstem disorders, neuromuscular conditions, kidney failure, and some endocrine or metabolic problems may also play a role. Central sleep apnea can also occur after exposure to high altitude, where lower oxygen levels affect breathing control.

Medications are another important factor. Opioid pain medicines can suppress breathing drive and increase the risk of central apneas. Sedating medicines may also worsen nighttime breathing in some people. In addition, some patients develop central apneas after starting therapy for obstructive sleep apnea, often improving over time but sometimes requiring treatment adjustment.

Risk tends to be higher in older adults, in men, and in people with cardiovascular or neurological disease. However, central sleep apnea can affect a wide range of patients, and the presence of symptoms should prompt evaluation rather than assumptions. In some cases, doctors also assess for related conditions such as sleep apnea more broadly, because mixed breathing patterns are common.

How Diagnosis Is Made

Diagnosis begins with a careful medical history and physical examination. A doctor will ask about sleep quality, witnessed breathing pauses, daytime symptoms, medications, heart and neurological history, and whether symptoms began after altitude change or treatment for another sleep disorder. A bed partner’s observations can be very helpful.

The main test for confirming central sleep apnea is a sleep study, also called polysomnography. This test monitors breathing, oxygen levels, heart rhythm, brain activity, body movements, and sleep stages. It helps distinguish central apneas, in which breathing effort decreases or disappears, from obstructive events, in which breathing effort continues against a blocked airway.

Sometimes additional testing is needed to look for the reason central sleep apnea developed. Depending on the individual’s situation, this may include heart evaluation, blood tests, review of medications, or neurological assessment. Imaging or specialist referral may be appropriate if there are signs of a brain or nerve disorder.

Diagnosis is important not only to identify the breathing pattern but also to guide safe treatment. Approaches that help one type of sleep apnea may not be best for another, so individualized assessment is essential.

Treatment Options

Treatment for central sleep apnea depends on its cause, severity, symptoms, and the person’s overall health. A key first step is addressing the underlying condition whenever possible. This may mean optimizing treatment for heart failure, reviewing opioid or sedating medications, managing neurological disease, or allowing time for acclimatization and supportive care if high altitude is involved.

Positive airway pressure therapy is commonly used. Depending on the pattern seen on the sleep study, a doctor may recommend continuous positive airway pressure, bilevel therapy, or adaptive servo-ventilation in selected patients. These devices help stabilize breathing during sleep, but they are chosen carefully because not every device is appropriate for every patient, especially in certain forms of heart failure. Some patients who are being evaluated for sleep apnea treatment may need adjustments over time as the breathing pattern becomes clearer.

Supplemental oxygen may be considered in some cases, particularly when oxygen levels fall during sleep or when altitude is a factor. Medication changes can also be important, especially when opioids contribute to central events. In selected situations, other therapies may be discussed by a sleep specialist, cardiologist, pulmonologist, or neurologist working together.

If symptoms are complex or linked to another condition, treatment may include care for that underlying problem as well. For example, a patient with breathing changes after a neurological event may need broader evaluation and management related to stroke. In specialized centers, sleep testing and tailored respiratory support may be part of a wider plan that can include neurology evaluation or cardiology assessment when medically appropriate.

Self-care and Prevention

Not all cases of central sleep apnea can be prevented, especially when they are linked to medical conditions that affect breathing control. Even so, practical steps can support treatment and reduce strain on the body. Following the care plan for heart, neurological, kidney, or metabolic conditions is one of the most important ways to help stabilize sleep breathing.

People should take medicines exactly as prescribed and should not stop opioids, sedatives, or other drugs suddenly without medical advice. If there are concerns that a medicine is affecting breathing during sleep, this should be discussed with the prescribing doctor. Avoiding alcohol or sedating substances near bedtime may also help some individuals.

Good sleep habits are valuable. Keeping a regular sleep schedule, creating a comfortable sleep environment, and getting enough sleep can improve sleep quality overall. If positive airway pressure therapy is prescribed, consistent use and proper mask fit are important for comfort and effectiveness.

Patients who travel to high altitude and have a history of sleep-related breathing problems should speak with a doctor before travel. In some cases, gradual ascent or preventive planning may reduce symptoms. Family members or bed partners can also play a supportive role by noticing nighttime breathing patterns and encouraging follow-up care.

When to See a Doctor

A doctor should be consulted if there are repeated pauses in breathing during sleep, frequent nighttime awakenings with breathlessness, excessive daytime sleepiness, or sleep that remains unrefreshing despite enough time in bed. These symptoms do not always mean central sleep apnea, but they do deserve evaluation.

Medical attention is especially important for people who have heart failure, stroke, neurological disease, use opioid medications, or recently developed new sleep-related breathing symptoms. In these situations, sleep changes may be part of a broader health issue that needs coordinated care.

Urgent medical care is appropriate if breathing problems are accompanied by severe shortness of breath, chest pain, confusion, fainting, or signs of a medical emergency. For ongoing but non-urgent symptoms, a sleep specialist or another qualified doctor can guide testing and treatment.

Near the end of the diagnostic journey, some patients seek multidisciplinary care in specialized centers. Acibadem International’s JCI-accredited hospitals offer evaluation and treatment for sleep-related breathing disorders by multidisciplinary specialists caring for international patients.

Frequently asked questions

What is the difference between central sleep apnea and obstructive sleep apnea?

Central sleep apnea happens when the brain temporarily fails to send consistent signals to the breathing muscles during sleep. Obstructive sleep apnea happens when breathing effort continues but the upper airway becomes blocked or narrowed. Some people have a combination of both patterns.

Is central sleep apnea serious?

It can be important to evaluate because it may affect sleep quality, oxygen levels, and daytime function, and it can sometimes point to an underlying medical condition. The degree of concern depends on the cause, the severity, and the person's overall health. Many patients improve with appropriate diagnosis and treatment.

Can central sleep apnea go away on its own?

Sometimes it can improve, especially if it is related to high altitude exposure or appears temporarily after starting treatment for obstructive sleep apnea. In other cases, it persists because of an ongoing medical cause such as heart, neurological, or medication-related factors. A doctor can monitor whether treatment is needed or whether the pattern is likely to resolve.

How is central sleep apnea diagnosed?

The most important test is a sleep study, which records breathing, oxygen levels, sleep stages, and breathing effort overnight. Doctors also review medical history, medications, and other health conditions to understand why the breathing pattern is occurring. Additional heart or neurological testing may be needed in some patients.

What treatments are used for central sleep apnea?

Treatment may include managing the underlying condition, adjusting medicines, using positive airway pressure devices, or providing oxygen in selected cases. The best option depends on the specific type of central sleep apnea and the patient's overall health. Treatment is individualized rather than one-size-fits-all.

Does everyone with central sleep apnea snore?

No. Snoring is more strongly associated with obstructive sleep apnea, although some people with central sleep apnea may snore if they also have obstructive events. The absence of loud snoring does not rule out a sleep-related breathing disorder.

References

• American Academy of Sleep Medicine
• National Heart, Lung, and Blood Institute
• American Heart Association
• National Institute of Neurological Disorders and Stroke
• European Respiratory Society

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.