CPAP* and APAP are both clinically effective therapies used in the treatment of sleep apnea.¹

Although the therapies may look similar as they both send air through a breathing tube to a face mask as you sleep, the pressure in the two settings is delivered differently.

Most APAP devices have CPAP functionality, so you have the option of switching between the two air pressure delivery settings.

In this article we take a closer look at both therapies to help you determine what setting may best suit you and your therapy needs. Remember to always seek advice from a healthcare professional before undertaking any new treatment.

 

CPAP - fixed pressure setting

CPAP (continuous positive airway pressure) delivers therapy users with a continuous flow of air at a fixed pressure setting throughout the night.²  The setting is prescribed by a healthcare professional following an overnight sleep study or home sleep test.

Advantages
CPAP therapy is the most widely prescribed for treatment for OSA, and it is often the first choice for people newly diagnosed with the condition. Generally, CPAP is cheaper and more widely available than APAP and the preferred device among healthcare insurance companies. CPAP is also considered by many to be simpler to use. Continued and consistent use of a CPAP machine can help alleviate the symptoms of OSA.²
 

Disadvantages

CPAP devices may not work for everyone. Some people may find it difficult adapting to the continuous airflow, struggle to fall asleep and then eventually stop using their therapy regularly enough for it to be successful. Therapy users can also feel uncomfortable when wearing an ill-fitting mask that is causing skin irritation and excessive mask leak.

 

APAP - changing pressure settings

APAP (auto-titrating positive airway pressure) uses software that automatically adjusts the pressure settings throughout the night to meet the fluctuating breathing needs of the therapy user.²

Advantages

The upside of APAP is that it will adjust to your breathing changes while you are sleeping, resulting in greater user comfort. Breathing changes can occur when you are congested or if you lose or gain weight. The APAP pressure settings will also change to suit changing sleep positions, which means it will ramp up when you sleep on your back to help combat the increased risk of your airway collapsing. 

Downsides 

APAP’s constant pressure adjustments make this a less than ideal choice for people who have health issues, such as cardiac and respiratory conditions. The added cost of an APAP machine can be a drawback for some therapy users.

 

So, which is better for me - CPAP or APAP?

CPAP and APAP are both great therapy choices for people with OSA.

Whatever you decide, check with your healthcare provider that the device you use is best for you, so you can achieve optimal results with your therapy.
 
See also, What is the difference between CPAP and BiPAP?