Obesity hypoventilation syndrome (OHS) is defined as the combined presence of obesity (BMI > 30kg/m2) with awake arterial hypercapnia (pCO2 > 6.0 kPa / 45 mmHg) in the absence of other causes of hypoventilation. The exact prevalence of OHS in the general population remains unknown, and most prevalence data describe subjects with obstructive sleep apnoea, wherein its prevalence has been estimated to range from 10% to 38% in different groups. On the other hand, patients with OHS often suffer from sleep-related breathing disorders. Prevalence of obstructive sleep apnoea may reach up to 90-95% in OHS patients.
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