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- W2028402045 abstract "Background: Atrial fibrillation (AF) is the most common sustained arrhythmia in clinical practice. The ReninAngiotensin-Aldosterone-System plays a major role for the atrial structural and electrical remodelling. Recently elevated aldosterone levels have been suggested to increase the risk for the development of AF. Methods: Rats were treated with aldosterone by means of an osmotic minipump (0.5µg/h) over a period of 4 weeks. AF was induced by transesophageal burst pacing. Action potentials (AP) were recorded from left atrial preparations with microelectrodes. Atrial collagen was quantified by histological studies. Results: Aldosterone treatment resulted in hypertrophy as indicated by an increased ratio of heart weight/tibia length and doubled the time until the AF converted spontaneously into sinus rhythm (85.8±13.4 s vs.38.3±6.9 s, p<0.01). This was associated with a significant shortening of the AP (APD90 26.2±1.1 vs. 31.2±1.9, p<0.05) and an increased protein expression of Kir2.1 and Kv1.5. Atrial collagen deposition was significantly greater in aldosterone-treated rats. The alterations could be prevented by additional application spironolactone. Conclusions: The results of the present study suggest that in addition to the structural remodelling aldosterone also promotes AF by altering repolarising potassium currents leading to action potential shortening." @default.
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- W2028402045 date "2012-01-01" @default.
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- W2028402045 title "Spironolactone Prevents Aldosterone Induced Increased Duration of Atrial Fibrillation in Rat" @default.
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- W2028402045 doi "https://doi.org/10.1159/000178483" @default.
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