Enhanced AutoSet
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Enhanced AutoSet™

The Enhanced AutoSet algorithm* now differentiates between Obstructive and Central Sleep Apneas** and responds appropriately. You enjoy peace of mind because you know the right therapy is always delivered.

S9 Series - More. Comfort.

Here's what people said after clinical trials with S9 ...

"Best comment I can make is that it felt like there was no device attached. Remarkable!"

"Waking up, I felt refreshed … I actually felt a boost of energy."

ResMed’s Enhanced AutoSet Algorithm

Central Sleep Apnea
Obstructive Sleep Apnea

ResMed’s AutoSet algorithm, the gold standard in automatic positive airway therapy, has been enhanced on the S9 platform with the addition of Central Sleep Apnoea detection. The Enhanced AutoSet algorithm detects the difference between an open and closed airway and treats them appropriately.

CSA detection

Central Sleep Apnea (CSA) detection is now available in both the S9 AutoSet and S9 Elite. It uses the Forced Oscillation Technique (FOT) to determine whether the airway is open or closed during an apnea. Small oscillations in pressure are added to the current device pressure. The CSA algorithm uses the resulting flow and pressures to measure whether the airway is open or closed.

A Quick Tutorial

What is Obstructive Sleep Apnea (OSA)?

  • OSA occurs when the airway becomes severely limited or completely blocked during sleep.
  • Breathing ceases for anything from 10 seconds to as long as two minutes!
  • Your body is stressed through lack of oxygen.
  • The brain reacts by sending urgent signals to restart breathing.
  • Blood oxygen levels fall and blood pressure rises.
  • This episode can repeat literally hundreds of times a night.

What is Central Sleep Apnea?

  • CSA occurs when the brain temporarily stops sending signals to the muscles that control breathing.
  • During a CSA, the airway will remain open but there is no airflow.


* The Enhanced AutoSet Algorithm is only available in the S9 AutoSet.
** Central Sleep Apnea (CSA) detection is available in both S9 AutoSet and S9 Elite.

S9 Enhanced AutoSet White Paper

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