OHS is defined as chronic daytime hypercapnia (PaCO2 of over 45 mmHg) in obese patients (those with a BMI of > 30kg/m2) after ruling out any other causes of hypoventilation.1
As a result of poor breathing, those with OHS suffer from excess carbon dioxide (hypoventilation) and insufficient oxygen in their blood (hypoxemia).
OHS symptoms include:
- Excessive daytime sleepiness (EDS) 2
- Morning headache2
As many as 90% of patients with OHS also suffer from obstructive sleep apnoea (OSA).