Page "Obesity hypoventilation syndrome" Paragraph 2
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Two subtypes are recognized, depending on the nature of disordered breathing detected on further investigations.
The first is OHS in the context of obstructive sleep apnea ; this is confirmed by the occurrence of 5 or more episodes of apnea, hypopnea or respiratory-related arousals per hour ( high apnea-hypopnea index ) during sleep.
The second is OHS primarily due to " sleep hypoventilation syndrome "; this requires a rise of CO < sub > 2 </ sub > levels by 10 mmHg ( 1. 3 kPa ) after sleep compared to awake measurements and overnight drops in oxygen levels without simultaneous apnea or hypopnea.
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