The survival time of patients with blood oxygen between 80-85% is related to the availability of effective methods of improving respiration, and the individual patient’s condition. Normal blood oxygen saturation is above 95%, and blood oxygen between 80%-85% indicates that the oxygen content in the patient’s blood has decreased and the patient is hypoxic. At this time, the patient may have difficulty breathing, shortness of breath, suffocation, purple lips and other symptoms of hypoxia. If the above symptoms are caused by acute hypoxic factors, such as acute pulmonary embolism, asphyxia, excessive CO inhalation, bronchial foreign body obstruction, etc., the patient may have life-threatening symptoms within a few hours, and ventilator assistance is needed immediately. In case of long-term chronic hypoxia due to interstitial lung disease, COPD, pulmonary heart disease, etc., patients may gradually tolerate a state of 80%-85% blood oxygen, which will not be life-threatening for a longer period of time, but will lead to a decline in the function of the organism and internal organs. Therefore, it is recommended that patients with respiratory distress and dyspnea should go to the emergency department of the hospital in time to seize the golden rescue time.