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. 2019 Oct 18;14:2377–2384. doi: 10.2147/COPD.S222803

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© 2019 Dreher et al.

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Distribution of patients by arterial carbon dioxide pressure (PaCO₂). Light blue = normocapnia (PaCO₂ <45 mmHg); Dark blue = hypercapnic (PaCO₂ 45 to <50 mmHg); Red & black = hypercapnic with an indication for non-invasive ventilation in Germany (red= PaCO₂ ≥50 mmHg; black = PaCO₂ ≥ 50 mmHg).