Carbon dioxide is always elevated because of serious damage to lung function, usually seen in poor ventilation, more common in patients with chronic obstructive pulmonary disease, which is clinically known as type II respiratory failure, for this case, if the patient is clear, it is recommended that non-invasive ventilator-assisted ventilation, and with intravenous drip respiratory stimulants, such as nikoksamy to stimulate the respiratory center, promote the discharge of carbon dioxide can gradually decline after 5-7 days. Carbon dioxide discharge, carbon dioxide can be gradually reduced after 5-7 days. If the patient’s consciousness is impaired or there is a coma, it is recommended to use invasive ventilator-assisted ventilation, after invasive ventilator ventilation treatment, carbon dioxide may also be reduced to normal.