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001-es BibID:	BIBFORM016887
Első szerző:	Bárándi László (élettanász)
Cím:	Drug-induced changes in action potential duration are proportional to action potential duration in rat ventricular myocardium / Bárándi, L., Harmati, G., Horváth, B., Szentandrássy, N., Magyar, J., Varró, A., Nánási, P.P., Bányász, T.
Dátum:	2010
ISSN:	0231-5882
Megjegyzések:	Several cardioactive agents exhibit direct or reverse rate-dependent effects on action potential duration (APD) depending on the experimental conditions. Recently, a new theory has been proposed, suggesting that the reverse rate-dependent mode of drug-action may be a common property of canine, rabbit, guinea pig and human cardiac tissues, and this phenomenon is based on the dependence of drug-action on baseline APD. The aim of the present work was to examine the limitations of this hypothesis by studying the APD lengthening effect of K+ channel blockers and the APD shortening effect of Ca2+ channel blockers during the electrical restitution process of rat ventricular action potentials. Rat ventricular muscle was chosen because it has a set of ion currents markedly different from those of other species, its APD is shorter by one order of magnitude than that of the "plateau-forming" larger mammals, and most importantly, its APD increases at higher heart rates ? opposite to many other species. The restitution of APD was studied as a function of the diastolic interval, a parameter indicating the proximity of action potentials. It was found that drug-induced APD changes in rat myocardium are proportional with the pre-drug value of APD but not with the diastolic interval, indicating that not the proximity of consecutive action potentials, but the baseline APD itself may determine the magnitude of drug-induced APD changes.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban Action potential duration Electrical restitution Membrane current Reverse rate dependence Ventricular repolarization
Megjelenés:	General Physiology And Biophysics. - 29 : 3 (2010), p. 309-313. -
További szerzők:	Harmati Gábor (1983-) (élettanász) Horváth Balázs (1981-) (élettanász) Szentandrássy Norbert (1976-) (élettanász) Magyar János (1961-) (élettanász) Varró András (1954-) (farmakológus, klinikai farmakológus) Nánási Péter Pál (1956-) (élettanász) Bányász Tamás (1960-) (élettanász)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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