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Central apnea: An apnea with no effort to breathe made during the entire period (this is a neurological issue, learn about central sleep apnea here).

Obstructive apnea: Meets the criteria of an apnea (above) and continued or increased effort to breathe is noted (the effort is due to an obstruction of the airway, learn more here).

Apnea: There is a drop in the signals shown above of at least 90% for at least 10 seconds.

This is the part of the process where a technician reviews the data that is recorded from your overnight sleep study. This criteria is used for scoring a sleep study. The figure below shows how the sensors used during a sleep study measure your breathing.

What is an apnea?Īn apnea is when your breathing stops for at least ten seconds while sleeping. It is most often used to determine the severity of a person’s sleep apnea. It’s the average number of combined apneas and hypopneas per hour.