Neurological Conditions That Cause Central Sleep Apnea
Central sleep apnea (CSA) can be caused by neurological conditions that affect the brainstem respiratory control centers, including stroke, brainstem tumors, hemorrhage, encephalitis, poliomyelitis, neuromuscular diseases, and cerebral microangiopathy. 1, 2
Primary Neurological Etiologies
The 2025 American Academy of Sleep Medicine guidelines classify CSA into six categories, with "CSA due to a medical disorder without Cheyne-Stokes" specifically encompassing neurological causes 1. The key neurological conditions include:
Brainstem Pathology
- Stroke/infarction - Particularly affecting the medullary respiratory centers
- Brainstem tumors - Compressing or infiltrating respiratory control regions
- Brainstem hemorrhage - Disrupting central respiratory drive
- Traumatic brain injury - With damage to brainstem respiratory centers 2
Infectious/Inflammatory Conditions
- Encephalitis - Inflammation affecting respiratory control centers
- Poliomyelitis - Historical but important cause of central respiratory dysfunction 2
Degenerative/Structural Conditions
- Cerebral microangiopathy - White matter lesions affecting brainstem connectivity 3
- Neuromuscular diseases - Including conditions like amyotrophic lateral sclerosis, muscular dystrophy 1, 4
- Multiple sclerosis - When demyelinating lesions affect brainstem respiratory centers
Other Neurological Associations
- Chiari malformation - Structural brainstem compression
- Autonomic dysfunction syndromes - Affecting respiratory control
- Post-stroke CSA - Can persist chronically after cerebrovascular events 5
Pathophysiological Mechanism
The critical pathophysiology involves disruption of the ventilatory motor output from brainstem respiratory centers. 1 During non-REM sleep, the "wakefulness drive to breathe" is removed, making respiration critically dependent on CO2 chemosensitivity. When brainstem lesions impair this control system, central apneas result from transient cessation of ventilatory motor output 1.
Advanced diffusion tensor imaging (DTI) studies demonstrate that microstructural changes in the brainstem correlate directly with CSA severity, even when conventional MRI appears normal 3. This suggests that subtle brainstem dysfunction—not visible on routine imaging—can cause clinically significant CSA.
Clinical Recognition
Neurological CSA may present even when daytime breathing patterns appear completely normal 2. Key distinguishing features include:
- Absence of the typical Cheyne-Stokes crescendo-decrescendo pattern seen in heart failure
- No history of opioid use or high-altitude exposure
- Presence of other neurological signs/symptoms
- Often occurs with depressed central respiratory drive rather than the increased chemosensitivity seen in heart failure-related CSA 1
Diagnostic Approach
When neurological CSA is suspected:
- Polysomnography is mandatory - Shows >50% of respiratory events are central in nature 1
- Brain MRI with attention to brainstem - Standard sequences plus consider DTI if available 3
- Neurological examination - Assess for cranial nerve deficits, motor/sensory changes
- Exclude other CSA causes - Heart failure (echocardiogram, BNP), medications (opioid history), metabolic disorders
Clinical Significance
CSA from neurological causes carries significant morbidity and mortality risk. A 21-year Veterans Health Administration study found almost one-fifth of CSA patients died within 5 years of diagnosis 1. The condition causes sleep fragmentation, daytime sleepiness, poor quality of life, and potential cardiovascular complications 1.
Treatment Implications
The underlying neurological condition must be addressed as the primary therapeutic target 1. For residual CSA after treating the underlying disorder, positive airway pressure therapy (particularly bilevel PAP or adaptive servo-ventilation) is recommended, though response varies based on the specific neurological pathology 1. Phrenic nerve stimulation represents a newer option for refractory cases 1.
Important caveat: Hypoventilation disorders are NOT classified as CSA, even though they may have neurological causes 1. The distinction is critical—CSA involves posthyperventilation hypocapnia leading to apnea, whereas hypoventilation involves inadequate ventilation with hypercapnia.