Lung tip pneumonia with a ventilator or oxygen concentrator good

Hello, the role of the ventilator and oxygen concentrator is different, the ventilator is mainly for patients with respiratory failure, assisted respiration, to prevent the occurrence of carbon dioxide storage acidosis, the oxygen concentrator is mainly to solve the lung function under the systemic hypoxia caused by a mild promotion of respiratory function. If it is a serious disease, such as interstitial pneumonia, you can use both. If you don't understand, you can ask me again, specifically which one to use according to the doctor's diagnosis to make a decision.