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001-es BibID:	BIBFORM030209
035-os BibID:	(Scopus)84055176212 (WoS)000298445500004
Első szerző:	Pueyo, Esther
Cím:	A multiscale investigation of repolarization variability and its role in cardiac arrhythmogenesis / Esther Pueyo, Alberto Corrias, László Virág, Norbert Jost, Tamás Szél, András Varró, Norbert Szentandrássy, Péter P. Nánási, Kevin Burrage, Blanca Rodríguez
Dátum:	2011
ISSN:	0006-3495
Megjegyzések:	Enhanced temporal and spatial variability in cardiac repolarization has been related to increased arrhythmic risk both clinically and experimentally. Causes and modulators of variability in repolarization and their implications in arrhythmogenesis are however not well understood. At the ionic level, the slow component of the delayed rectifier potassium current (I(Ks)) is an important determinant of ventricular repolarization. In this study, a combination of experimental and computational multiscale studies is used to investigate the role of intrinsic and extrinsic noise in I(Ks) in modulating temporal and spatial variability in ventricular repolarization in human and guinea pig. Results show that under physiological conditions: i), stochastic fluctuations in I(Ks) gating properties (i.e., intrinsic noise) cause significant beat-to-beat variability in action potential duration (APD) in isolated cells, whereas cell-to-cell differences in channel numbers (i.e., extrinsic noise) also contribute to cell-to-cell APD differences; ii), in tissue, electrotonic interactions mask the effect of I(Ks) noise, resulting in a significant decrease in APD temporal and spatial variability compared to isolated cells. Pathological conditions resulting in gap junctional uncoupling or a decrease in repolarization reserve uncover the manifestation of I(Ks) noise at cellular and tissue level, resulting in enhanced ventricular variability and abnormalities in repolarization such as afterdepolarizations and alternans.
Tárgyszavak:	Orvostudományok Elméleti orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban action-potential duration short-term variability guinea-pig ventricle i-ks early afterdepolarizations current fluctuations rectifier currents myocytes channel model egyetemen (Magyarországon) készült közlemény
Megjelenés:	Biophysical Journal. - 101 : 12 (2011), p. 2892-2902. -
További szerzők:	Corrias, Alberto Virág László (élettanász Szeged) Jost Norbert Szél Tamás Varró András (1954-) (farmakológus, klinikai farmakológus) Szentandrássy Norbert (1976-) (élettanász) Nánási Péter Pál (1956-) (élettanász) Burrage, Kevin Rodríguez, Blanca
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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