Pulmonary shunting during anaesthesia in man.
Qs/Qt was determined during halothane and oxygen anaesthesia in 22 patients. All were believed to have no pulmonary dysfunction. A surgical operation was in progress and respiration was controlled. Qs/Qt was minimal in 15 of these patients (means 3.9 plus or minus 0.3%), indicating that anaesthesia and operation can be conducted in man without a significant increase of pulmonary shunting. The level of shunting was increased in the other seven patients. In neither group was Qs/Qt altered by the passage of time. Age varied between 23 and 61 years and was directly and significantly correlated to Qs/Qt (r=0.57,P less than0.01).
D000328:Adult; D000769:Anesthesia, Inhalation; D002245:Carbon Dioxide / Q000097:blood; D006221:Halothane; D006801:Humans; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D011652:Pulmonary Circulation; D012119:Respiration; D013514:Surgical Procedures, Operative
D002245:Carbon Dioxide; D010100:Oxygen; D006221:Halothane