Sleep apnea is a sleep disorder that causes breathing to stop repeatedly during sleep. However, not all sleep apnea is the same. There are two main types with different mechanisms, causes, and therapies: Obstructive Sleep Apnea (OSA) dan Central Sleep Apnea (CSA). Understanding the difference is crucial to getting the right treatment.
Obstructive Sleep Apnea (OSA): A Mechanical Problem
OSA is the most common type, accounting for 84% of sleep apnea cases. It occurs when the airway is physically blocked during sleep because overly relaxed throat muscles cause the soft tissue to collapse.
Causes of OSA
- Obesity — fat accumulation in the neck area compresses the airway
- Enlarged tonsils or adenoids
- Certain anatomical structures: a large tongue, small jaw, high palate
- Consumption of alcohol and sedatives that weaken pharyngeal muscle tone
- Sleeping on the back
Typical Symptoms of OSA
- Loud, interrupted snoring — the most characteristic symptom of OSA
- Waking with a choking or gasping feeling
- Nocturia (frequent nighttime urination)
- Excessive daytime sleepiness
- Morning headaches
OSA Treatment
- CPAP — delivers constant positive air pressure, the gold standard of therapy
- Weight loss — every 10% of weight loss reduces AHI by up to 26%
- Positional therapy — for positional OSA
- Oral appliance — pushes the jaw forward to open the airway
- Surgery — for cases with clear anatomical anomalies
Central Sleep Apnea (CSA): A Brain Signal Problem
CSA occurs when the brain fails to send the right breathing signals to the breathing muscles. The airway is open, but the “command to breathe” doesn't come — the complete opposite of OSA.
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- Congestive heart failure — the most common, causing a Cheyne-Stokes breathing pattern
- Stroke or brainstem lesions
- Opioid medications that suppress the respiratory center in the brain
- High altitude (Altitude-Induced CSA)
- Idiopathic (with no identified cause)
Typical Symptoms of CSA
- No snoring — this is the main distinction from OSA
- Breathing that stops without any effort to breathe
- Repeated waking with a feeling of breathlessness
- Extreme daytime sleepiness
- Often associated with serious heart disease
CSA Treatment
- ASV (Adaptive Servo-Ventilation) — more advanced than CPAP, adjusting pressure in real time according to the patient's breathing pattern. Note: ASV is contraindicated in heart failure patients with LVEF <45%
- BiPAP with a backup rate — ensures a minimum number of breaths per minute
- Acetazolamide — for altitude-induced CSA
- Reducing/stopping opioids — if that is the cause
- Treating the underlying disease — especially heart failure
OSA vs. CSA Comparison
| Aspect | OSA | CSA |
|---|---|---|
| Mechanism | Physical airway obstruction | Failure of brain signals to the breathing muscles |
| Mendengkur | Frequent, loud | Absent/rare |
| Prevalence | 84% of sleep apnea cases | ~0.9% of the general population |
| Disease association | Obesity, hypertension, diabetes | Heart failure, stroke, opioids |
| Main therapy | CPAP, lifestyle changes | ASV, treating the underlying disease |
Mixed Sleep Apnea
About 10–15% of cases are “mixed sleep apnea” — starting with a central episode, then continuing as obstructive within one breathing cycle. This is often seen in patients who have just started CPAP (Treatment-Emergent Central Sleep Apnea/TECSA).
Both OSA and CSA require a definitive diagnosis through polysomnography that can distinguish between them. Resindo Medika provides a comprehensive sleep study with analysis by experienced sleep specialists to ensure the right diagnosis and therapy.
