Comparative ventricular electrophysiologic effect of racemic bupivacaine, levobupivacaine, and ropivacaine on the isolated rabbit heart

被引:49
|
作者
Mazoit, JX [1 ]
Decaux, A [1 ]
Bouaziz, H [1 ]
Edouard, A [1 ]
机构
[1] Univ Paris Sud, Bicetre Coll Med, UPRES EA392, Anesthesia Lab, Paris, France
关键词
Langendorff; NONMEM; pharmacometrics; PK-PD;
D O I
10.1097/00000542-200009000-00028
中图分类号
R614 [麻醉学];
学科分类号
100217 ;
摘要
Background: Numerous local anesthetics have an asymmetric tetrahedron carbon, which confers stereoselective differences between the isomers, The authors attempted to quantify the depressant effect of racemic bupivacaine, levobupivacaine, and ropivacaine on myocardial ventricular conduction and on myocardial contractility. Methods: The authors studied the pharmacokinetics (outflow concentration) and pharmacodynamics (QRS widening) of the three drugs infused in an isolated rabbit heart preparation. All data were fitted simultaneously with use of mixed-effect modeling, thus allowing precise statistical comparison between the three drug parameters. The rate dependence of QRS widening was fitted separately. Results: Racemic bupivacaine, levobupivacaine, and ropivacaine induced a calculated maximum increase in QRS duration in the ratio 1:0.4:0.3, Css(50), the dose which caused half the maximum increase in QRS duration at steady state, was similar for all three drugs (22 mu M free concentration), A rate dependence of QRS widening was observed, which was in the ratio 1:0.5:0.25 for racemic bupivacaine, levobupivacaine, and ropivacaine, respectively. Conclusions: In the isolated rabbit heart, racemic bupivacaine, levobupivacaine, and ropivacaine induce an increase in QRS duration in the respective ratio of 1:0.4:0.3, which was rare dependent in approximately the same ratio.
引用
收藏
页码:784 / 792
页数:9
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