Breathe deeply and quickly, and increase muscle tone. Carbon dioxide accumulation is due to insufficient effective alveolar ventilation, which prevents the body's metabolite carbon dioxide from being smoothly discharged and is retained in the body. Often accompanied by hypoxia. Clinical manifestations include increased pulse rate and blood pressure (lower blood pressure in severe cases), dilation of blood vessels causing flushing of the skin, increased muscle tone, and increased cerebral blood flow causing increased cerebral pressure.