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- W2058744110 abstract "In this study, the inhibitory action of angiotensin II (Ang II) receptor blocker (ARB) on Ang II-induced conduction blocking in the left atrium was studied. Transmembrane action potentials and effective refractory period (ERP) were recorded from the left atrial trabeculae of spontaneously hypertensive rats (SHR(Izm)s) that had been treated with or without olmesartan medoxomil (AT1 receptor blocker, 3.0 mg kg(-1)) for 8 weeks before the recording. During rapid electrical stimulation (RES), changes in activation time (AT) and frequencies of the conduction block were studied under perfusion of Ang II (10(-8) M) or Ang II plus ARB (10(-7) M). Interstitial fibrosis in the left atrium was quantitatively assessed using histological sections. Although action potential parameters and ERP did not differ between the two groups when preparations were driven with a basic cycle length, an Ang II-induced conduction delay was observed during RES, and this was significantly suppressed in SHR(Izm)s treated with ARB (P<0.05). The Ang II-induced conduction block was also significantly reduced with perfusion of ARB (P<0.05). The interstitial fibrous area was significantly larger in untreated SHR(Izm)s than in treated animals (P<0.01). This antagonizing action of AT1 blockade might contribute to its non-antiarrhythmic therapeutic effect on atrial fibrillation because of its indirect and direct actions on the structural and functional remodeling of the left atrium." @default.
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- W2058744110 date "2009-07-10" @default.
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- W2058744110 title "Direct action of an angiotensin II receptor blocker on angiotensin II-induced left atrial conduction delay in spontaneously hypertensive rats" @default.
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- W2058744110 doi "https://doi.org/10.1038/hr.2009.89" @default.
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