Hypoventilation is too shallow or too slow breathing, which does not meet the needs of the body.
If a person hypoventilates, the body's carbon dioxide level rises. This causes a buildup of acid and too little oxygen in the blood.
Wagner PD, Powell FL, West JB. Ventilation, blood flow, and gas exchange. In: Mason RJ, Broaddus VC, Martin TR, et al, eds. Murrayand Nadel's Textbook of Respiratory Medicine. 5th ed. Philadelphia, Pa: Saunders Elsevier; 2010:chap 4.