title: Effects of pirmenol on electrical induction of sustained ventricular tachycardia in a seven-day-old canine myocardial infarction.
abstract: Effects of pirmenol on electrical induction of sustained ventricular tachycardia (VT) were examined in 14 dogs with 7-day-old myocardial infarctions. Before administration of the drug, sustained VT was induced in 8 of 14 dogs. After administration of 3 mg/kg pirmenol, induction of VT was suppressed in 2 dogs but remained inducible in 6 dogs. After cumulative administration of 5 mg/kg pirmenol, VT was no longer inducible in 3 dogs but in the other 3 dogs VTs were still inducible at increased cycle lengths. After 7 mg/kg pirmenol, VT was not inducible in the remaining three dogs. Arrhythmias could not be provoked in any postinfarction dogs after pirmenol administration. Plasma concentrations after sequential and cumulative administration of 3, 5, and 7 mg/kg pirmenol averaged 0.43, 0.65, and 1.15 micrograms/ml, respectively. Administration of pirmenol increased the effective refractory period (ERP) and paced QRS duration in both the normal and infarcted ventricular myocardium. In the infarcted myocardium, prolongation of the ERP for the second and third extrastimuli was greater than for the first one (p less than 0.05). Results indicate that pirmenol is effective for prevention of sustained VT owing to prolongation of both the ERP and conduction time in recent myocardial infarction.
authors.affiliation: 2nd Department of Internal Medicine, Tokyo Medical and Dental University, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Nitta
authors.forename: A
authors.initials: A
authors.lastname: Nogami
authors.forename: K
authors.initials: K
authors.lastname: Aonuma
authors.forename: H
authors.initials: H
authors.lastname: Akimoto
authors.forename: Y H
authors.initials: YH
authors.lastname: Chung
authors.forename: A
authors.initials: A
authors.lastname: Takahashi
authors.forename: Y
authors.initials: Y
authors.lastname: Iesaka
authors.forename: F
authors.initials: F
authors.lastname: Marumo
authors.forename: M
authors.initials: M
authors.lastname: Hiraoka
mesh_terms: D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000494:pharmacology*; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography / Q000187:drug effects; D004594:Electrophysiology; D006352:Heart Ventricles / Q000187:drug effects; D009203:Myocardial Infarction / Q000150:complications / Q000188:drug therapy / Q000503:physiopathology*; D010880:Piperidines / Q000494:pharmacology* / Q000627:therapeutic use; D013610:Tachycardia / Q000188:drug therapy* / Q000209:etiology / Q000517:prevention & control; D016276:Ventricular Function / Q000187:drug effects
chemical_list: D000889:Anti-Arrhythmia Agents; D010880:Piperidines; C024318:pirmenol