Pharmacodynamic interaction between propofol and lidocaine during anesthesia induction
- VernacularTitle:麻醉诱导期间异丙酚与利多卡因的相互作用
- Author:
Xingan ZHANG
;
Ruosong WANG
;
Qunling WU
- Publication Type:Journal Article
- Keywords:
Propofol;
Lidocaine;
Drug interaction;
Target controlled infusion
- From:
Chinese Journal of Anesthesiology
1994;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the influence of lidocaine on the propofol concentration effect relationships for loss of eyelash reflex and loss of consciousness,hemodynamic function Methods Thirty eight patients were randomly allocated to receiving a computer controlled infusion of lidocaine at target concentration of 0?g?ml -1 (group A,n=9),1 25?g?ml -1 (group B,n=7), 2 5?g?ml -1 (group C,n=7), 5?g?ml -1 (group D,n=8),or 7?g?ml -1 (group E,n=7) respectively While the target concentration of lidocaine was kept stable, propofol was administrated with a computer controlled infusion at an initial target concentration of 0 5 1?g?ml -1 , which was increased every time by 0 5?g?ml -1 until loss of consciousness Plasma concentrations of lidocaine and propofol were measured with high performance liquid chromatography Results 50% of patients lost eyelash reflex and consciousness at plasma propofol concentrations(Cp50) of 1 78 and 3 17?g?ml -1 in the absence of lidocaine In the presence of plasma lidocaine concentration of 1 25 4 3 ?g?ml -1 ,the Cp50 for loss of eyelash reflex was reduced by 42 1% There was a linear regression relationship between plasma lidocaine concentrations from 0 to 7?g?ml -1 and the Cp50 for loss of consciousness (r=-0 69 ) Conclusions The Chinese Cp50 for loss of eyelash reflex and consciousness are lower than those reported abroad Plasma lidocaine concentration at 4?g?ml -1 can potentiate properly the potency of propofol on the sedation and hypnosis during anesthesia induction
