- Restrictive or mixed syndrome with alveolar hypoventilation.
- Palliative cases after a decompensation or patient who can not weaned from ventilator.
Patients attained by chronic respiratory insufficiency with alveolar hypoventilation and hypercapnia:
- nocturnal PtcCO2 (transcutaneous pressure ofthe carbon dioxide) > 50 mmHg; and/or fordiurnal PACO2 (arterialpartial pressure of the carbon dioxide) >45 mmHg.
- In case of failure of the long-term oxygénothérapy in COPD patients with clinical signs of hypoventilation, PACO2> 55 mmHg and frequent hospitalisations for exacerbations.