If patients with respiratory failure undergo oxygen therapy, it is necessary to choose different therapy plans based on the type of respiratory failure. In the case of Type I respiratory failure, there is simply a lack of oxygen. For Type II respiratory failure, there is not only a lack of oxygen but also an accumulation of carbon dioxide. Therefore, for Type I respiratory failure, the oxygen flow can be higher, over five liters per minute, and the patient can continuously receive oxygen without causing significant side effects. However, for Type II respiratory failure, it is essential to control the oxygen flow at a low rate, under three liters per minute, otherwise, it may lead to other complications.