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pubmed-article:11747025pubmed:abstractTextThis study was designed to assess the effects of afterload reduction in asymptomatic patients with severe aortic regurgitation (AR) and maintained LV function by cine-MRI. We studied 13 patients at baseline and after 0.2 mg/kg Hydralazine (I.V.). Patients were stratified according to the volumetric LV response to acute afterload reduction: Group I comprised patients with improved LV response; Group II comprised patients with unchanged or deteriorated LV response. Baseline LV function and severity of AR were not significantly different between groups. However, regurgitant fraction decreased (50 +/- 12 vs. 36 +/- 9%; P < 0.03) and cardiac output increased (4.9 +/- 1.4 vs. 7.1 +/- 1.6l/minute; P < 0,001) in Group I and remained unchanged in Group II (54 +/- 10 vs. 55 +/- 10%, P = n.s. and 5.5 +/- 1.4 vs. 6.6 +/- 0.9l/minute; P = n.s.) during maximal vasodilation. Beat-to-beat analysis revealed a decrease of left ventricular endsystolic volume index in group I (48 +/- 13 vs. 37 +/- 9 ml/beat; P < 0.05) and no change in group II (61 +/- 20 vs. 62 +/- 20 ml/beat; P = n.s.). In the natural history of chronic AR, the absence of improved LV performance during acute vasodilation using beat-to-beat analysis by MRI may identify patients with more advanced cardiac adaptation to chronic volume overload.lld:pubmed
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pubmed-article:11747025pubmed:authorpubmed-author:FrankHHlld:pubmed
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pubmed-article:11747025pubmed:copyrightInfoCopyright 2001 Wiley-Liss, Inc.lld:pubmed
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pubmed-article:11747025pubmed:pagination693-7lld:pubmed
pubmed-article:11747025pubmed:dateRevised2007-11-15lld:pubmed
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pubmed-article:11747025pubmed:articleTitleAfterload reduction in severe aortic regurgitation.lld:pubmed
pubmed-article:11747025pubmed:affiliationDepartment of Radiology, University Hospital Vienna, Vienna, Austria. Hoffmann@helix.mgh.harvard.edulld:pubmed
pubmed-article:11747025pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11747025pubmed:publicationTypeComparative Studylld:pubmed