Which COPD groups are not suitable for noninvasive ventilator treatment

Contraindications for noninvasive mechanical ventilation in patients with chronic obstructive pulmonary disease include: first, the patient is unconscious and cannot cooperate effectively; second, the patient's airway protection ability is poor; third, the patient's sputum is too much and cannot be discharged effectively; fourth, the patient has vomiting. Severe upper gastrointestinal bleeding; fifth, the patient has severe abdominal distension; Sixth, this patient, for example, has recent nasal and facial crush injuries, which are not suitable for non-invasive ventilation treatment.