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how do cpap machines sense apneas?

tony72 wrote:how do cpap machines sense apneas?

The machines have sensors and sophisticated software programmed in them. They determine "events" by the flow of air going through the machine and responses in breathing by the user. By definition, an "apnea" is the lack of breathing for at least 10 seconds. Consequently, if the machine senses a "no breathing" condition for at least 10 seconds, it believes there is an apnea occurring.


Den

Wulfman wrote:

tony72 wrote:how do cpap machines sense apneas?

The machines have sensors and sophisticated software programmed in them. They determine "events" by the flow of air going through the machine and responses in breathing by the user. By definition, an "apnea" is the lack of breathing for at least 10 seconds. Consequently, if the machine senses a "no breathing" condition for at least 10 seconds, it believes there is an apnea occurring.


Den

They analyse the flow context as well to determine the disruption. Which is why you can rarely cheat a machine into thinking you have an apnea by stopping your breath - awake breathing is generally much too irregular.