Carbon dioxide partial pressure is one of the indicators reflecting respiratory acid-base intoxication, the test value of 90 (the unit should be mmHg) is generally still save, it is recommended to standardize the treatment in a timely manner. Carbon dioxide partial pressure refers to the partial pressure of arterial blood carbon dioxide, for the physical dissolution of CO₂ in human blood pressure, is an indicator of respiratory acid-base poisoning, the normal range of the test value is generally 35 ~ 45mmHg. If the partial pressure of carbon dioxide is lower than 35mmHg, it means that the patient may have respiratory alkalosis, if it is greater than 45mmHg, it means that the patient has respiratory acidosis, and the test value is 90mmHg, which means that the patient’s respiratory acidosis is more serious. Carbon dioxide partial pressure of 90mmHg will generally increase the patient’s cerebrospinal fluid hydrogen ion concentration, reduce the excitability of brain cells, the metabolism will also be affected, which can lead to pulmonary encephalopathy, but also cause respiratory distress, coma and other more serious symptoms. It is recommended that the patient undergoes oxygen therapy in time to correct the primary disease, and if necessary, the patient can be assisted in breathing through a ventilator. When the partial pressure of carbon dioxide exceeds the normal range, attention should be paid to it and prompt medical treatment should be sought.