Document Detail


Diffuse myocardial fibrosis in severe aortic stenosis: an equilibrium contrast cardiovascular magnetic resonance study.
MedLine Citation:
PMID:  22634740     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIMS: Haemodynamics alone do not fully explain symptoms and prognosis in clinically severe aortic stenosis (AS). Myocardial disease, specifically diffuse myocardial fibrosis (DMF), may contribute. We used equilibrium contrast cardiovascular magnetic resonance (EQ-CMR) and sought to non-invasively measure DMF in severe AS and determine its clinical significance before and after valve replacement.
METHODS AND RESULTS: Patients with severe AS underwent echocardiography, brain natriuretic peptide (BNP), 6 min walk test (6MWT), and EQ-CMR pre- (n = 63) at baseline and at 6 months post- (n = 42) aortic valve replacement (AVR). EQ-CMR was also performed in 30 normal controls. Baseline: patients with AS had more DMF than controls (18 vs. 13%, P = 0.007) with a wide range (5-38%) that overlapped controls. The extent of diffuse fibrosis correlated inversely with the 6MWT performance (r(2) = 0.22, P = 0.001). Those with severe diastolic dysfunction had more DMF (P = 0.01). On multivariable analysis, the predictors of performance at 6MWT were diffuse fibrosis and BNP (P = 0.003 and 0.02, respectively). Post-op: following valve replacement, morphological and functional parameters improved [6 MWT, LA area, BNP, left ventricular (LV) hypertrophy, and volumes]. LV hypertrophy regression was shown to be cell volume reduction (P < 0.001) and not fibrosis regression (P = 0.54). Of the five deaths over six-month follow-up, four occurred in patients in the highest tertile of DMF.
CONCLUSION: DMF as measured by EQ-CMR is elevated in severe AS vs. normal controls but with a considerable overlap. It correlates with functional capacity at baseline. LV hypertrophy regression 6 months after AVR is cellular rather than fibrosis resolution.
Authors:
Andrew S Flett; Daniel M Sado; Giovanni Quarta; Mariana Mirabel; Denis Pellerin; Anna S Herrey; Derek J Hausenloy; Cono Ariti; John Yap; Shyam Kolvekar; Andrew M Taylor; James C Moon
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-05-25
Journal Detail:
Title:  European heart journal cardiovascular Imaging     Volume:  13     ISSN:  2047-2412     ISO Abbreviation:  Eur Heart J Cardiovasc Imaging     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-18     Completed Date:  2013-02-18     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  101573788     Medline TA:  Eur Heart J Cardiovasc Imaging     Country:  England    
Other Details:
Languages:  eng     Pagination:  819-26     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Aged
Aortic Valve Stenosis / diagnosis*,  pathology,  surgery
Contrast Media*
Disease Progression
Endomyocardial Fibrosis / diagnosis*,  pathology,  surgery
Exercise Test
Exercise Tolerance
Female
Hemodynamics
Humans
Hypertrophy, Left Ventricular
Magnetic Resonance Imaging, Cine*
Male
Middle Aged
Prognosis
Prospective Studies
Severity of Illness Index
Statistics as Topic
Grant Support
ID/Acronym/Agency:
FS/08/028/24767//British Heart Foundation; FS/10/72/28568//British Heart Foundation; //Department of Health
Chemical
Reg. No./Substance:
0/Contrast Media

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