hypocapnia
  低碳酸血; 缺碳酸血症
  hy·po·cap·nia /-ˈkæpnɪə/ 名詞
  低碳酸血症,低碳酸血,缺二氧化碳,碳酸過少
  hypocapnia
       n : a state in which the level of carbon dioxide in the blood is
           lower than normal; can result from deep or rapid
           breathing [syn: acapnia] [ant: hypercapnia]