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Continuous Positive Airway Pressure Therapy (CPAP)

Continuous Positive Airway Pressure Therapy (CPAP) - What it is

Obstructive sleep apnoea (OSA) is a condition caused by repeated upper airway obstruction during sleep, due to narrowing of the upper airway. It occurs when the muscles controlling the upper airway relax during sleep, resulting in a collapse or narrowing of the airway. This causes oxygen levels in the blood to decrease.

Upper Airway Anatomy


The Apnoea Hypopnoea Index (AHI) represents the number of apnoea (pauses in breathing) and hypopnoea (reduction in breathing) events per hour of sleep during your sleep study, and indicates the severity of your sleep apnoea.


Continuous Positive Airway Pressure Therapy (CPAP) - Symptoms

Continuous Positive Airway Pressure Therapy (CPAP) - How to prevent?

Continuous Positive Airway Pressure Therapy (CPAP) - Causes and Risk Factors

Continuous Positive Airway Pressure Therapy (CPAP) - Diagnosis

Continuous Positive Airway Pressure Therapy (CPAP) - Preparing for surgery

Continuous Positive Airway Pressure Therapy (CPAP) - Post-surgery care

Continuous Positive Airway Pressure Therapy (CPAP) - Other Information

The information provided is not intended as medical advice. Terms of use. Information provided by SingHealth

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