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Low transvalvular flow rate predicts mortality in patients with low-gradient aortic stenosis following aortic valve intervention

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Title: Low transvalvular flow rate predicts mortality in patients with low-gradient aortic stenosis following aortic valve intervention
Authors: Vamvakidou, A
Jin, W
Danylenko, O
Chahal, N
Khattar, R
Senior, R
Item Type: Journal Article
Abstract: OBJECTIVES: This study aimed to assess the value of low transvalvular flow rate (FR) for the prediction of mortality compared with low stroke volume index (SVi) in patients with low-gradient (mean gradient: <40 mm Hg), low aortic valve area (<1 cm2) aortic stenosis (AS) following aortic valve intervention. BACKGROUND: Transaortic FR defined as stroke volume/left ventricular ejection time is also a marker of flow; however, no data exist comparing the relative prognostic value of these 2 transvalvular flow markers in patients with low-gradient AS who had undergone valve intervention. METHODS: We retrospectively followed prospectively assessed consecutive patients with low-gradient, low aortic valve area AS who underwent aortic valve intervention between 2010 and 2014 for all-cause mortality. RESULTS: Of the 218 patients with mean age 75 ± 12 years, 102 (46.8%) had low stroke volume index (SVi) (<35 ml/m2), 95 (43.6%) had low FR (<200 ml/s), and 58 (26.6%) had low left ventricular ejection fraction <50%. The concordance between FR and SVi was 78.8% (p < 0.005). Over a median follow-up of 46.8 ± 21 months, 52 (23.9%) deaths occurred. Patients with low FR had significantly worse outcome compared with those with normal FR (p < 0.005). In patients with low SVi, a low FR conferred a worse outcome than a normal FR (p = 0.005), but FR status did not discriminate outcome in patients with normal SVi. By contrast, SVi did not discriminate survival either in patients with normal or low FR. Low FR was an independent predictor of mortality (p = 0.013) after adjusting for age, clinical prognostic factors, European System for Cardiac Operative Risk Evaluation II, dimensionless velocity index, left ventricular mass index, left ventricular ejection fraction, heart rate, time, type of aortic valve intervention, and SVi (p = 0.59). CONCLUSIONS: In patients with low-gradient, low valve area aortic stenosis undergoing aortic valve intervention, low FR, not low SVi, was an independent predictor of medium-term mortality.
Issue Date: Sep-2019
Date of Acceptance: 17-Jan-2018
URI: http://hdl.handle.net/10044/1/59900
DOI: https://doi.org/10.1016/j.jcmg.2018.01.011
ISSN: 1936-878X
Publisher: Elsevier
Start Page: 1715
End Page: 1724
Journal / Book Title: JACC: Cardiovascular Imaging
Volume: 12
Issue: 9
Copyright Statement: © 2018 by the American College of Cardiology Foundation. Published by Elsevier. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Life Sciences & Biomedicine
Cardiac & Cardiovascular Systems
Radiology, Nuclear Medicine & Medical Imaging
Cardiovascular System & Cardiology
low-gradient aortic stenosis
stroke volume index
transvalvular flow rate
PARADOXICAL LOW-FLOW
PRESERVED EJECTION FRACTION
IMPACT
AREA
REPLACEMENT
AFTERLOAD
SEVERITY
low-gradient aortic stenosis
stroke volume index
transvalvular flow rate
low-gradient aortic stenosis
stroke volume index
transvalvular flow rate
1102 Cardiorespiratory Medicine and Haematology
1103 Clinical Sciences
Cardiovascular System & Hematology
Publication Status: Published
Conference Place: United States
Online Publication Date: 2018-03-14
Appears in Collections:National Heart and Lung Institute