Many elderly people with chronic bronchitis, emphysema, and pulmonary heart disease who end up with chronic respiratory failure also refuse oxygen therapy by medical personnel. These elderly people always think that they feel “fine” and that they can remain “normal” without oxygen and refuse. And sometimes, they may refuse to take oxygen on purpose to show that their condition is not as serious as the doctors estimate. But it may not occur to them that doing so is quite dangerous. In chronic respiratory failure, the danger of oxygen deprivation to life is systemic, not only will it affect the respiratory system, but more terrible is that oxygen deprivation will seriously affect the function of heart and brain and other important organs, which can induce cardiac arrest and sudden death, and can cause mental changes, such as mania, coma, etc., which will further aggravate the condition. Even if this time can get away with it, but each attack of the disease will bring more serious, more extensive and more lasting damage to the heart. In time, not only were the lung problems harder to treat, but the heart problems became even harder to treat. The process of walking into death was accelerated. This is very unfortunate. Why give up so easily when there was still a chance? You could have lived a better quality of life, a happier and more enjoyable life, so why refuse? So please ask the patient to obey medical advice when facing oxygen or treatment with a ventilator, and never miss the time of treatment.