THE ROLE OF NA+-K+-ATPASE IN THE BASIC AND RATE-DEPENDENT PROPERTIES OF ISOLATED PERFUSED RABBIT ATRIOVENTRICULAR NODE

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KHOURI V.; NAYEBPOUR M.; NASERI MOHSEN; HOSSEIN KHALEH JIR S.GH.R.; SALEHI AREF

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Journal: Physiology and Pharmacology Year:2008 | Volume:11 | Issue:4 Page(s): 261-269

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Title

THE ROLE OF NA+-K+-ATPASE IN THE BASIC AND RATE-DEPENDENT PROPERTIES OF ISOLATED PERFUSED RABBIT ATRIOVENTRICULAR NODE

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Keywords

ISOLATED HEARTQ3

RABBIT AV NODQ3

OUABAINEQ3

NA+-K+ ATPASEQ3

Abstract

Introduction: OUABAINE is a well-known atrioventricular (AV) node depressant agent, but its effects on functional properties of the AV node have not been cleared. The aim of the present study was to determine how OUABAINE administration modifies the rate-dependent properties of the AV node.Methods: Selective stimulation protocols were used to quantify independently electrophysiological properties of the Node. OUABAINE was added directly to superfusion tyrods in a cumulative model (0.05, 0.1, 0.2, 0.25 mM). The same stimulation protocols were repeated before and after OUABAINE addition. Comparisons among multiple groups were made by two-way analysis of variance. P<0.05 was considered significant.Results: OUABAINE decreased fatigue in low concentration (0.05mM), whereas at high concentrations increased the magnitude of fatigue. OUABAINE (0.2, 0.25 mM) caused significant increase in basic properties of the AV-Node (AVCT, WBCL, ERP, FRP). WBCL was prolonged by OUABAINE (0.25mM) from 147.5±8.9 to 194±13 msec. Also amount of facilitating decreased by 0.2mM OUABAINE from 43.3±5 to 38.8±5 msec.Conclusion: The paradoxical effects of OUABAINE on the fatigue indicate potential role of Na+-K+-ATPase in the protective mechanism of the AV-node.

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APA: Copy

KHOURI, V., NAYEBPOUR, M., NASERI, MOHSEN, HOSSEIN KHALEH JIR, S.GH.R., & SALEHI, AREF. (2008). THE ROLE OF NA⁺-K⁺-ATPASE IN THE BASIC AND RATE-DEPENDENT PROPERTIES OF ISOLATED PERFUSED RABBIT ATRIOVENTRICULAR NODE. PHYSIOLOGY AND PHARMACOLOGY, 11(4), 261-269. SID. https://sid.ir/paper/75147/en

Vancouver: Copy

KHOURI V., NAYEBPOUR M., NASERI MOHSEN, HOSSEIN KHALEH JIR S.GH.R., SALEHI AREF. THE ROLE OF NA⁺-K⁺-ATPASE IN THE BASIC AND RATE-DEPENDENT PROPERTIES OF ISOLATED PERFUSED RABBIT ATRIOVENTRICULAR NODE. PHYSIOLOGY AND PHARMACOLOGY[Internet]. 2008;11(4):261-269. Available from: https://sid.ir/paper/75147/en

IEEE: Copy

V. KHOURI, M. NAYEBPOUR, MOHSEN NASERI, S.GH.R. HOSSEIN KHALEH JIR, and AREF SALEHI, “THE ROLE OF NA⁺-K⁺-ATPASE IN THE BASIC AND RATE-DEPENDENT PROPERTIES OF ISOLATED PERFUSED RABBIT ATRIOVENTRICULAR NODE,” PHYSIOLOGY AND PHARMACOLOGY, vol. 11, no. 4, pp. 261–269, 2008, [Online]. Available: https://sid.ir/paper/75147/en

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