Electrocardiographic and hemodynamic effects of cisapride alone and combined with erythromycin in anesthetized dogs

The cardiovascular effects of cisapride administered intravenously at escalating doses with and without pretreatment with erythromycin were evaluated in morphine/chloralose anesthetized dogs. Dogs were instrumented to permit simultaneous recording of ECGs, left ventricular (LVP) and aortic (AoP) pre...

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Bibliographic Details
Published in:Cardiovascular toxicology 2002, Vol.2 (3), p.195-207
Main Authors: Al-Wabel, Naser A, Strauch, S Mark, Keene, Bruce W, Nakayama, Tomohiro, Hamlin, Robert L
Format: Article
Language:English
Subjects:
Anesthesia, Intravenous - methods
Animals
Cardiac arrhythmia
Cisapride - pharmacology
Dogs
Dose-Response Relationship, Drug
Drug Combinations
Drug Synergism
Electrocardiography
Electrocardiography - drug effects
Electrocardiography - methods
Erythromycin - pharmacology
Female
Hemodynamics - drug effects
Hemodynamics - physiology
Injections, Intravenous
Male
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Summary:The cardiovascular effects of cisapride administered intravenously at escalating doses with and without pretreatment with erythromycin were evaluated in morphine/chloralose anesthetized dogs. Dogs were instrumented to permit simultaneous recording of ECGs, left ventricular (LVP) and aortic (AoP) pressures, as well as programmed electrical stimulation (PES). Escalating intravenous doses of cisapride from 2 to 8 mg/kg (four times the recommended therapeutic dose) increased the heart rate (HR) and prolonged the corrected QT interval (QTc) (p < 0.05) compared to controls. Pretreatment with erythromycin failed to enhance the effect of cisapride on either HR or QTc. Cisapride with or without erythromycin pretreatment had no effect on AoP, but depressed indices of left ventricular contractility (dP/dt(max) decreased while PEP/ET increased) compared to controls. No dogs developed spontaneous arrhythmias, and arrhythmias were not inducible by PES. Cisapride with or without erythromycin pretreatment altered the orientation of the T-wave vector (p < 0.05) compared to controls, indicating a primary effect of cisapride on ventricular repolarization. The QTc and T wave changes observed were consistent with the known action of cisapride on canine I(Kr) channels.
ISSN:1530-7905
1559-0259
DOI:10.1007/s12012-002-0004-5