Lack of correlation between the antiarrhythmic effect of L-propionylcarnitine on reoxygenation-induced arrhythmias and its electrophysiological properties

Giovanni Gambassi, Mario Barbieri, Pierugo Carbonin, E Cerbai, P Lo Giudice, I Masini, A Mugelli, M Pahor

Risultato della ricerca: Contributo in rivistaArticolo in rivista

16 Citazioni (Scopus)

Abstract

1. The antiarrhythmic effect of L-propionylcarnitine (L-PC) was evaluated in the guinea-pig isolated heart; arrhythmias were induced with hypoxia followed by reoxygenation and by digitalis intoxication. 2. L-PC 1 microM, was found to be the minimal but effective antiarrhythmic concentration against reoxygenation-induced ventricular fibrillation. No antiarrhythmic effect was observed against digitalis-induced arrhythmias. D-Propionylcarnitine, L-carnitine and propionic acid did not exert antiarrhythmic effects. 3. During hypoxia and reoxygenation L-PC consistently prevented the rise of the diastolic left ventricular pressure, and significantly reduced the release of the cardiac enzymes creatine kinase (CK) and lactic dehydrogenase (LDH). 4. The electrophysiological effects of L-PC were then studied on either normal sheep cardiac Purkinje fibres or those manifesting oscillatory after potentials induced by barium or strophanthidin. 5. L-PC (1 and 10 microM) did not significantly modify action potential characteristics and contractility of normal Purkinje fibres, or the amplitude of OAP induced by strophanthidin or barium. 6. It is concluded that the antiarrhythmic action of L-PC on reoxygenation-induced arrhythmias is not correlated with its direct electrophysiological effects studied on normoxic preparations.
Lingua originaleEnglish
pagine (da-a)73-78
Numero di pagine6
RivistaBRITISH JOURNAL OF PHARMACOLOGY
Volume102
Stato di pubblicazionePubblicato - 1991

Keywords

  • Animals
  • Anti-Arrhythmia Agents
  • Arrhythmias, Cardiac
  • Barium
  • Carnitine
  • Coronary Circulation
  • Creatine Kinase
  • Digoxin
  • Electrocardiography
  • Electrophysiology
  • Guinea Pigs
  • L-Lactate Dehydrogenase
  • Membrane Potentials
  • Perfusion
  • Purkinje Fibers
  • Sheep
  • Strophanthidin

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