• J X Zhou and J Liu.
• Department of Anesthesiology, Fuwai Hospital and Cardiovascular Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P. R. China. jianxinz@yeah.net
• J. Cardiothorac. Vasc. Anesth. 2001 Oct 1; 15 (5): 555-9.

ObjectiveTo determine an estimate of blood/gas partition coefficients of volatile anesthetics during cardiac surgery.DesignDescriptiveSettingUniversity hospitalParticipantsSix adult patients undergoing valvular replacement with hypothermic cardiopulmonary bypass.Measurements And Main ResultsBlood samples were obtained from patients at 6 time points: before induction, at skin incision, at aortic cannulation, at rewarming during bypass, at weaning off bypass, and at skin suture. Measured blood/gas partition coefficients were plotted against corresponding solubilities estimated according to the combined effects of hypothermia and hemodilution. Significant differences were found in blood/gas partition coefficients of the 3 anesthetics at different times during surgery (p < 0.05). Blood/gas partition coefficients at weaning off bypass were the lowest, about 75% of that before anesthetic induction. A direct linear relationship for estimated solubility against measured solubility was found (r2 = 0.94; p < 0.05).ConclusionDynamic changes in blood/gas partition coefficients of volatile anesthetics were found during cardiac surgery. They could be estimated by using multiple linear regression equations reflecting the combined effects of hypothermia and hemodilution.Copyright 2001 by W.B. Saunders Company

18 keywords...

hide…