How Common is Central Sleep Apnea?
Central sleep apnea (CSA) is relatively uncommon in the general population, with a prevalence of approximately 0.9-1.5%, but becomes substantially more common in specific high-risk populations, particularly patients with heart failure (up to 50-60%), chronic opioid users, and those with chronic kidney disease. 1, 2, 3
Prevalence by Population
General Population
- Overall prevalence: 0.9% (95% CI: 0.7-1.2%) in community-based cohorts 3
- Cheyne-Stokes respiration specifically: 0.4% (95% CI: 0.3-0.6%) 3
- In elderly populations (mean age 72 years): approximately 6% have predominantly central sleep apnea 4
High-Risk Populations
Heart Failure Patients:
- CSA affects up to 50-60% of patients with heart failure 5, 6
- Among those with self-reported heart failure, obstructive sleep apnea (OSA) is actually more common at 55.1% compared to CSA at 4.1% 3
- This represents the single largest group of CSA patients clinically
Other High-Risk Groups:
- Chronic kidney disease patients: CSA is prevalent but often under-recognized 7
- Chronic opioid users: substantial prevalence, though exact numbers vary
- Sleep surgery clinic referrals: nearly 1 in 10 (9.8%) have clinically significant CSA, though only 1% carry the diagnosis upon presentation 8
Clinical Context and Mortality Impact
CSA carries significant prognostic implications, particularly regarding mortality and morbidity. In a 21-year retrospective study of Veterans Health Administration records, almost one-fifth of patients with CSA died within 5 years of diagnosis 1. The condition is associated with:
- Increased mortality and hospitalization in heart failure patients
- Sleep fragmentation and poor quality of life
- Daytime sleepiness and insomnia
- Sympathetic activation and arrhythmias 6
Important Clinical Caveats
CSA is frequently missed or misdiagnosed in clinical practice. In the sleep surgery clinic study, 90% of CSA cases were only identified through careful review of sleep study data rather than being diagnosed upon presentation 8. Key factors associated with occult CSA include:
- Older age
- Male sex (CSA more common in men than women, even in elderly populations) 3, 4
- Significant cardiovascular comorbidities 8
- Lower BMI compared to OSA patients 3
The true prevalence may be underestimated because CSA represents less than 10% of adaptive servo-ventilation indications in sleep clinics 5, and many patients present with mixed disorders where both obstructive and central events occur 1.