Central Sleep Apnea

Core concept

Repeated episodes of apnea and hypopnea during sleep caused by reduced respiratory effort from the brain's breathing control centers, distinguished from Obstructive Sleep Apnea Hypopnea by the absence of airway obstruction as the primary mechanism.

Plain-language explanation

Central Sleep Apnea involves pauses in breathing during sleep caused by the brain temporarily failing to send the signals needed to breathe, rather than by a physical airway obstruction. This is confirmed via polysomnography showing apnea events without the obstructive pattern seen in Obstructive Sleep Apnea Hypopnea, and can be associated with certain medical conditions (such as heart failure) or with opioid use.

Developmental considerations

Can occur at any adult age, often in association with an underlying medical condition (such as heart failure) or with opioid medication use, distinguishing its typical risk profile from Obstructive Sleep Apnea Hypopnea's association with obesity and airway anatomy.

Functional impact

Produces similar daytime consequences to other sleep-disordered breathing conditions -- excessive sleepiness, impaired concentration -- alongside management considerations tied to any underlying medical cause.

Associated features

Can be associated with heart failure, opioid use, or high-altitude exposure; unlike obstructive sleep apnea, loud snoring is less consistently reported.

Cultural considerations

Awareness of sleep-disordered breathing symptoms and access to polysomnography for diagnostic confirmation vary by setting, which can affect how readily this diagnosis is distinguished from the more commonly recognized obstructive form.

Common misconception

A common misconception is that all sleep apnea is obstructive and related to snoring or body weight; central sleep apnea has a different underlying mechanism (reduced central respiratory drive) and a different typical risk profile.

Reconsider this formulation

Reconsider this diagnosis if polysomnography instead shows an obstructive pattern, which would point toward Obstructive Sleep Apnea Hypopnea.

Example fictional case

A 58-year-old man with a history of heart failure reports excessive daytime sleepiness, and polysomnography reveals repeated apnea events without the obstructive pattern or loud snoring typical of obstructive sleep apnea.

References

APA (2022). DSM-5-TR, Sleep-Wake Disorders.

Recognition pattern

Repeated apnea/hypopnea events during sleep confirmed by polysomnography, attributable to reduced central respiratory drive rather than airway obstruction.

What to notice

• Repeated apnea/hypopnea events during sleep confirmed by polysomnography
• Reduced central respiratory drive as the mechanism, not airway obstruction
• Often associated with heart failure, opioid use, or high-altitude exposure
• Excessive daytime sleepiness as a downstream consequence

Distinguish

Distinguish from Obstructive Sleep Apnea Hypopnea by the underlying mechanism confirmed on polysomnography: reduced respiratory drive here versus airway obstruction there.

Differential considerations

Obstructive Sleep Apnea Hypopnea (the key distinguishing feature is the presence versus absence of airway obstruction as the mechanism, confirmed via polysomnography, since the two can appear similar based on history alone), Hypersomnolence Disorder (a primary sleepiness disorder without any apnea events on polysomnography), an underlying medical condition or opioid use contributing to the pattern, which should be identified and addressed as part of management.

Commonly confused conditions

• Obstructive Sleep Apnea Hypopnea
• Hypersomnolence Disorder

Related comparisons

Reasoning prompts

• Does polysomnography show an obstructive or a central pattern of apnea events?
• Is there an underlying medical condition (heart failure) or opioid use that could be contributing to reduced respiratory drive?

Clarifying questions to ask

• Does polysomnography show respiratory effort during apneic events or its absence?
• Is there an underlying condition like heart failure or opioid use that could drive a central pattern?
• Is loud snoring or witnessed airway obstruction part of the presentation?
• Does polysomnography with capnography show discrete pauses in respiratory effort (pointing to Central Sleep Apnea) or a sustained pattern of inadequate ventilation with CO2 elevation (pointing to Sleep-Related Hypoventilation)?
• Is there a known predisposing condition -- heart failure or opioid use versus obesity or neuromuscular disease -- that would favor one mechanism over the other?
• Has polysomnography confirmed a central apneic breathing pattern, supporting a Central Sleep Apnea diagnosis alongside or instead of Substance/Medication-Induced Sleep Disorder?
• Is chronic opioid use (or another substance) the likely cause, which would support considering both diagnoses together rather than either alone?

Case Lab

Practice questions

2 question(s) reference this disorder. Practice Central Sleep Apnea →