title: Experimental compound OR-K-242-HCl an anilide derivative slows conduction velocity of the heart in the conscious beagle dog.
abstract: OR-K-242-HCl is an antitussive compound. Because it resembles lidocaine structurally, one of its target organs may be the heart. In anaesthetized guinea pigs OR-K-242-HCl depressed function of the heart. The aim of the present study was to test effects of OR-K-242-HCl on the conduction velocity of the heart in the conscious beagle dog. OR-K-242-HCl was administered 6 mg/kg and 12 mg/kg i.v. and 6 mg/kg, 12 mg/kg, 24 mg/kg, and 36 mg/kg orally. The doses for lidocaine (reference substance) were 6 mg/kg, and 12 mg/kg i.v. and 6 mg/kg, 12 mg/kg, and 24 mg/kg orally. Five consecutive noisefree cycles of ECG were used before and every 15 min up to three hours after the drug administrations. For each cycle PQ-, QTC-, RR-interval, as well as, QRS-complex and heart rate were calculated. Both OR-K-242-HCl and lidocaine prolonged the conduction velocity in the atria and ventricles. After i.v. and oral administration OR-K-242-HCl induced stronger and more uniform responses than lidocaine. The oral drug administrations produced more sustained responses than the intravenous injections for both compounds.
authors.forename: H
authors.initials: H
authors.lastname: Hanhijärvi
authors.forename: H M
authors.initials: HM
authors.lastname: Voipio
authors.forename: H
authors.initials: H
authors.lastname: Huuskonen
authors.forename: P
authors.initials: P
authors.lastname: Männistö
authors.forename: T
authors.initials: T
authors.lastname: Nevalainen
mesh_terms: D000284:Administration, Oral; D000818:Animals; D004285:Dogs; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000187:drug effects* / Q000502:physiology; D006339:Heart Rate / Q000187:drug effects; D007275:Injections, Intravenous; D008012:Lidocaine / Q000633:toxicity; D008297:Male; D010880:Piperidines / Q000008:administration & dosage / Q000633:toxicity*
chemical_list: D010880:Piperidines; D008012:Lidocaine; C051410:vadocaine