Posted by Krishna on April 07, 2003 at 20:55:51:

In Reply to: Sleep Hypoventilation and End Tidal CO2 posted by David Bresch on March 13, 2003 at 19:15:37:

To answer the second question, as per Berry (Sleep Med Pearls, Pg 156, answer to case 59):
"Many children with OSA exhibit relatively few discrete apneas or hypopneas; instead they show long periods of hypoventilation and desaturation. For this reason pediatric sleep laboratories often use end-tidal PCO2 monitoring to assess periods of hypoventilation. An increase in end-tidal Pco2 to > 55 mmHg for any duration and > 50 mmHg for longer than 10% of the total sleep time (or > 45 mmHg for longer than 60%) is considered abnormal."

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