HOMEPRODUCTSCOMPANYCONTACTFAQResearchDictionaryPharmaSign Up FREE or Login

Effects of amiodarone on supraventricular tachycardia involving bypass tracts.

Abstract
This study evaluates whether the electrophysiologic effects of i.v. amiodarone in patients with reentrant supraventricular tachycardia (SVT) can predict the efficacy of long-term oral therapy with this drug. The effects of oral and i.v. amiodarone were studied in 27 patients with SVT. In 14 the SVT circuit involved a concealed atrioventricular bypass for retrograde conduction (Group I), and in 13 a concealed atrio-His bypass (Group II). Intravenous amiodarone induced significant prolongation of the AH interval, the refractory periods of the atrium, atrioventricular node, His-Purkinje system and ventricular myocardium. The ventriculoatrial interval was slightly prolonged in Group I patients and did not change in Group II patients after i.v. administration of the drug. In both groups, the effective refractory period (ERP) of the concealed bypass was prolonged by i.v. amiodarone. During control state, SVT could be induced in all patients; after i.v. administration of the drug, SVT was presented in 6 patients in Group I and in 8 patients in Group II. In all cases, in which i.v. amiodarone prolonged the ERP of the concealed bypass to more than 350 ms, the drug always prevented SVT even when given orally. All but 2 patients--1 from Group I and 1 from Group II--remained asymptomatic after oral amiodarone. In the patient from Group I, SVT had been prevented by i.v. amiodarone, whereas in the patient from Group II SVT could not be induced by ventricular stimulation during the control state, but appeared after i.v. administration of the drug.(ABSTRACT TRUNCATED AT 250 WORDS)
AuthorsP Alboni, N Shantha, R Pirani, F Baggioni, S Scarfo, A M Tomasi, A Masoni
JournalThe American journal of cardiology (Am J Cardiol) Vol. 53 Issue 1 Pg. 93-8 (Jan 01 1984) ISSN: 0002-9149 [Print] United States
PMID6691283 (Publication Type: Journal Article)
Chemical References
  • Benzofurans
  • Amiodarone
Topics
  • Adolescent
  • Adult
  • Aged
  • Amiodarone (therapeutic use)
  • Atrioventricular Node (physiopathology)
  • Benzofurans (therapeutic use)
  • Child
  • Electrocardiography
  • Electrophysiology
  • Female
  • Heart Conduction System (physiopathology)
  • Humans
  • Male
  • Middle Aged
  • Tachycardia (drug therapy, physiopathology)

Join CureHunter, for free Research Interface BASIC access!

Take advantage of free CureHunter research engine access to explore the best drug and treatment options for any disease. Find out why thousands of doctors, pharma researchers and patient activists around the world use CureHunter every day.
Realize the full power of the drug-disease research graph!


Choose Username:
Email:
Password:
Verify Password:
Enter Code Shown: