•Polysomnograph sleep studies measure about ten items, of which three are Nasal airflow, Pulse, and Oxygen saturation.
•This chart shows differences in Nasal airflow, Pulse, and Oxygen saturation between Normal breathing, Obstructive Apnea, and Central Apnea.
•Notice that Nasal airflow, Pulse, and Oxygen saturation are all steady in Normal sleep, but not so in either OSA or CSA.
•The purple areas in Obstructive Apnea are obstructions; the deep pink areas in Central Apnea are Central events, and the light pink areas in both Obstructive Apnea and in Central Apnea are desaturations of oxygen.
