Hypoxemic pneumonia is a major cause of hospitalization in Pulmonology. The patient's dependency on oxygen prevents early discharge from the hospital. An automated oxygen therapy is a system that allows administration of oxygen with a flow that is automatically adjusted to the patient's saturation, which is continuously monitored. This system has proven to be particularly effective with chronic obstructive pulmonary disease (COPD) patients, by decreasing the time spent in hypoxia and hyperoxia, and by accelerating the weaning of oxygen. Our hypothesis is that automated oxygen therapy leads to a diminution on the length of hospital stay.