Farkas, A. and Coker, Susan J. (2002) Limited induction of torsade de pointes by terikalant and erythromycin in an in vivo model. European Journal of Pharmacology, 449 (1-2). pp. 143-153. ISSN 0014-2999Full text not available in this repository. (Request a copy from the Strathclyde author)
The proarrhythmic activities of the selective IKr blocker erythromycin and the less selective K+ channel blockers, terikalant and clofilium, have been compared in an α1-adrenoceptor-stimulated, anaesthetized rabbit model. Terikalant (2.5, 7.5 and 25 nmol kg−1 min−1; n=10), erythromycin (133, 400 and 1330 nmol kg−1 min−1; n=8), clofilium (20, 60 and 200 mg kg−1 min−1; n=10) or vehicle (n=8) was infused intravenously over 19 min and there was a 15-min interval between each infusion. QT and QTc intervals, and epicardial monophasic action potential duration were prolonged significantly (and to a similar extent) only by clofilium and terikalant. The total incidences of torsade de pointes were 60%*, 20%, 0% and 0% in clofilium-, terikalant-, erythromycin- and vehicle-treated animals, respectively (*P<0.05 compared to vehicle control). In conclusion, terikalant exerted mild proarrhythmic activity though it prolonged repolarisation markedly. Despite being given in high doses, erythromycin neither prolonged repolarisation nor induced proarrhythmia.
|Keywords:||K+ channel blocker, terikalant, proarrhythmia, erythromycin, torsade de pointes, clofilium , α1-Adrenoceptor stimulation , Pharmacy and materia medica, Pharmacology|
|Subjects:||Medicine > Pharmacy and materia medica|
|Department:||Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences|
|Depositing user:||Pure Administrator|
|Date Deposited:||28 Feb 2012 16:21|
|Last modified:||27 Apr 2016 12:31|