• Florent Le Ven, Mélanie Freeman, John Webb, Marie-Annick Clavel, Miriam Wheeler, Éric Dumont, Chris Thompson, Robert De Larochellière, Robert Moss, Daniel Doyle, Henrique B Ribeiro, Marina Urena, Luis Nombela-Franco, Josep Rodés-Cabau, and Philippe Pibarot.
• Institut Universitaire de Cardiologie et de Pneumologie de Québec/Québec Heart and Lung Institute, Laval University, Québec City, Québec, Canada.
• J. Am. Coll. Cardiol. 2013 Aug 27;62(9):782-8.

ObjectivesThis study sought to assess the impact of baseline left ventricular (LV) outflow, LV ejection fraction (LVEF), and transvalvular gradient on outcomes following transcatheter aortic valve replacement (TAVR) in patients with severe aortic stenosis (AS).BackgroundLow flow (i.e., reduced stroke volume index [SVi]) can occur with both reduced and preserved LVEF. Low flow is often associated with low gradient despite severe stenosis and with worse outcomes following surgical aortic valve replacement. However, there are few data about the impact of low flow on outcomes following TAVR.MethodsWe retrospectively analyzed the clinical, Doppler-echocardiographic, and outcome data prospectively collected in 639 patients who underwent TAVR for symptomatic severe AS in 2 Canadian centers.ResultsIn this cohort, 334 (52.3%) patients had a low flow (SVi <35 ml/m(2)) and these patients had increased 30-day mortality (11.4 vs. 5.9%, p = 0.01), 2-year all-cause mortality (35.3 vs. 30.9%, p = 0.005), and 2-year cardiovascular mortality (25.7 vs. 16.8%, p = 0.01) compared with patients with normal flow. Reduced flow was an independent predictor of 30-day mortality (odds ratio: 1.94, p = 0.026), cumulative all-cause mortality (hazard ratio: 1.27 per 10 ml/m(2) SVi decrease, p = 0.016), and cumulative cardiovascular mortality (hazard ratio: 1.29 per 10 ml/m(2) decrease, p = 0.04). Despite significant association in univariable analyses, low LVEF and low mean gradient were not found to be independent predictors of outcomes in multivariable analyses.ConclusionsLow flow but not low LVEF or low gradient is an independent predictor of early and late mortality following TAVR in high-risk patients with severe AS. SVi should be integrated in the risk stratification process of these patients.Copyright © 2013 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

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