Electrophysiologic effects of detajmium on isolated dog cardiac ventricular and purkinje fibers

O. Hála, Miklós Németh, A. Varró, J. Papp

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We studied the electrophysiologic effects of the antiarrhythmic compound detajmium (Tachmalcor) on isolated dog and rabbit cardiac preparations, applying the conventional intracellular microelectrode techniques. In dog ventricular muscle fibers (37°C, stimulation frequency I Hz), I lM detajmium did not change resting potential (RP), action potential amplitude (APA) ' AP duration measured at 90% of repolarization (APD90), or effective refractory period (ERP) significantly, but reduced maximum rate of depolarization (Vmax) significantly from 236.7 ± 28.9 to 177.3 ± 22.5 V/s (n = 6, p <0.01). In dog Purkinje fibers (37°C, stimulation frequency I Hz), I lM detajmium significantly decreased APA from 111.1 ±12.3 to 100.0 ± 2.5 mV (n = 8, p <0.003), APD90 from 359.0 ± 17.5 to 262.1 ± Ì2.3 ms (n = 8, p max from 687.5 ± 57.2 to 523.7 ± 58.2 V/s (n = 8, p <0.001) without changing maximal diastolic potential or ERP APD ratio significantly. The effect of detajmium on Vmax in both dog ventricular muscle and Purkinje fibers was frequency dependent. Fractional Vmai block was 0.185 ± 0.008 1/AP. The recovery kinetics of Vmax (offset kinetics) was extremely slow (time constant = 348.16 ± 57.43 s) considerably slower than most of those of other antiarrhythmic drugs yet reported. Detajmium in concentration

Original languageEnglish
Pages (from-to)559-565
Number of pages7
JournalJournal of Cardiovascular Pharmacology
Volume24
Issue number4
Publication statusPublished - 1994

Fingerprint

Purkinje Fibers
Dogs
pamidronate
Action Potentials
Muscles
Anti-Arrhythmia Agents
Transcription Factor AP-1
Microelectrodes
Membrane Potentials
detajmium
Rabbits

Keywords

  • Action potential
  • Antiarrhythmics
  • Detajmium
  • Electrophysiology
  • Heart
  • Tachmalcor

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Pharmacology

Cite this

Electrophysiologic effects of detajmium on isolated dog cardiac ventricular and purkinje fibers. / Hála, O.; Németh, Miklós; Varró, A.; Papp, J.

In: Journal of Cardiovascular Pharmacology, Vol. 24, No. 4, 1994, p. 559-565.

Research output: Contribution to journalArticle

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