Reverse rate-dependent changes are determined by baseline action potential duration in mammalian and human ventricular preparations View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2010-02-03

AUTHORS

László Bárándi, László Virág, Norbert Jost, Zoltán Horváth, István Koncz, Rita Papp, Gábor Harmati, Balázs Horváth, Norbert Szentandrássy, Tamás Bányász, János Magyar, Antonio Zaza, András Varró, Péter P. Nánási

ABSTRACT

Class III antiarrhythmic agents exhibit reverse rate-dependent lengthening of the action potential duration (APD). In spite of the several theories developed so far to explain this reverse rate-dependency (RRD), its mechanism has not yet been clarified. The aim of the present work was to further elucidate the mechanisms responsible for RRD in mammalian ventricular myocardium. Action potentials were recorded using conventional sharp microelectrodes from human, canine, rabbit and guinea pig ventricular myocardium in a rate-dependent manner varying the cycle length (CL) between 0.3 and 5 s. Rate-dependent drug effects were studied using agents known to lengthen or shorten action potentials, and these drug-induced changes in APD were correlated with baseline APD values. Both drug-induced lengthening (by dofetilide, sotalol, E-4031, BaCl2, veratrine, BAY K 8644) and shortening (by mexiletine, tetrodotoxin, lemakalim) of action potentials displayed RRD, i.e., changes in APD were greater at longer than at shorter CLs. In rabbit, where APD is a biphasic function of CL, the drug-induced APD changes were proportional to baseline APD values but not to CL. Similar results were obtained when repolarization was modified by injection of inward or outward current pulses in isolated canine cardiomyocytes. In each case the change in APD was proportional to baseline APD (i.e., that measured before the superfusion of drug or injection of current). Also, the net membrane current (Inet), determined from the action potential waveform at the middle of the plateau, was inversely proportional to APD and consequently with to CL. The results indicate that RRD is a common characteristic of all the drugs tested regardless of the modified ion current species. Thus, drug-induced RRD can be considered as an intrinsic property of cardiac membranes based on the inverse relationship between Inet and APD. More... »

PAGES

315-323

References to SciGraph publications

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    http://scigraph.springernature.com/pub.10.1007/s00395-009-0082-7

    DOI

    http://dx.doi.org/10.1007/s00395-009-0082-7

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1030394942

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/20127488


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    353 grid-institutes:grid.9008.1 schema:alternateName Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged, Hungary
    354 schema:name Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged, Hungary
    355 rdf:type schema:Organization
     




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