Document Detail


Elevated B-type natriuretic peptide despite normal left ventricular function on rest and exercise stress echocardiography in mitral regurgitation.
MedLine Citation:
PMID:  18202251     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIMS: To determine whether elevated B-type natriuretic peptide (BNP) predicts left ventricular (LV) contractile dysfunction on exercise stress echocardiography in patients with severe mitral regurgitation (MR). METHODS AND RESULTS: Thirty three patients with moderate-to-severe or severe MR, a LV ejection fraction > or =60% and New York Heart Association Class I or II symptoms, and 12 controls underwent resting and exercise stress echocardiography. In 20 MR patients, BNP was within the normal range (mean +/- SD, 7.7 +/- 2.7 pmol/L), and in 13 MR patients, BNP was >12 pmol/L (19.6 +/- 7.6 pmol/L). LV end-systolic volume index after exercise was lower in controls than patients with MR (P < 0.0001), but similar in MR patients with normal and elevated BNP, respectively (controls 8.5 +/- 3.9, MR 20 +/- 7 vs. 20 +/- 9 cm(2)/m(2), P > 0.05). However, pulmonary artery systolic pressure (PAP) after exercise was higher in MR with high BNP (70 +/- 20 vs. 48 +/- 11 mmHg, <0.0001) and controls (38+/-11 mmHg). A two-fold increase in plasma BNP was associated with an average increase in resting PAP of 7.6 (95% CI 2.9, 12.2) mmHg, an increase in post-exercise PAP of 14.4 (95% CI 9.0, 19.9) mmHg and increase in left atrial area index of 2.1 (95% CI 0.5, 3.8) cm(2)/m(2). However, there was no significant association between the plasma level of BNP and any rest or post-exercise measure of LV systolic function (r < 0.25, P > 0.05 for all). CONCLUSION: The plasma level of BNP may be within the normal range in patients with moderate-to-severe or severe MR despite significant increases in LV end-systolic volume. Increase in BNP is associated with pulmonary artery hypertension on exercise and left atrial enlargement even when LV systolic function on exercise stress echocardiography is normal.
Authors:
Andrew J Kerr; O Christopher Raffel; Gillian A Whalley; Irene Zeng; Ralph A Stewart
Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-01-17
Journal Detail:
Title:  European heart journal     Volume:  29     ISSN:  0195-668X     ISO Abbreviation:  Eur. Heart J.     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-02-04     Completed Date:  2008-06-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006263     Medline TA:  Eur Heart J     Country:  England    
Other Details:
Languages:  eng     Pagination:  363-70     Citation Subset:  IM    
Affiliation:
Department of Cardiology, Middlemore Hospital, Hospital Road, Private Bag 93311, Otahuhu, Auckland, New Zealand. andrewkerr@middlemore.co.nz
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MeSH Terms
Descriptor/Qualifier:
Case-Control Studies
Echocardiography, Stress
Female
Humans
Hypertension, Pulmonary / etiology
Male
Middle Aged
Mitral Valve Insufficiency / blood*,  ultrasonography
Natriuretic Peptide, Brain / blood*
Predictive Value of Tests
Stroke Volume
Ventricular Dysfunction, Left / blood,  diagnosis*
Ventricular Function, Left / physiology
Chemical
Reg. No./Substance:
114471-18-0/Natriuretic Peptide, Brain
Comments/Corrections
Comment In:
Eur Heart J. 2008 Feb;29(3):290-2   [PMID:  18202250 ]

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