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Exercise capacity and peak oxygen consumption in asymptomatic patients with chronic aortic regurgitation.

Abstract：

BACKGROUND:In patients with chronic, hemodynamically significant aortic regurgitation (AR), a long period of left ventricular remodeling usually occurs prior to the development of symptoms or left ventricular dysfunction. The value of cardiopulmonary exercise testing in patients with asymptomatic AR is not established. MATERIAL AND METHODS:Sixty-six asymptomatic patients aged 44±14 years with hemodynamically significant, chronic AR and no indication for aortic valve replacement were evaluated by echocardiography, cardiac magnetic resonance imaging and exercise testing with measurement of peak oxygen consumption. RESULTS:The average left ventricular end diastolic volume was 244±62ml and the aortic regurgitant fraction 34±13%. At an average of 35.8±8.9ml/kg/min, peak oxygen consumption was well preserved. As in healthy individuals, a high peak oxygen consumption was associated with a relatively large LV end diastolic volume (r=0.51; p<0.001) and a low resting heart rate (r=-0.37; p=0.002). The aortic regurgitant fraction was not predictive of maximum oxygen consumption. Higher levels of N-terminal pro-B-type natriuretic peptide (NT-proBNP) were independently associated with poorer exercise capacity and oxygen uptake (adjusted β -0.35; p=0.003). CONCLUSION:Our results suggest that in asymptomatic patients with moderate to severe AR and moderately dilated left ventricles, remodeling is primarily adaptive. An increased level of NT-proBNP is associated with a reduced capacity for work and reduced oxygen consumption, possibly heralding the onset of adverse remodeling.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Broch K,Urheim S,Massey R,Stueflotten W,Fosså K,Hopp E,Aakhus S,Gullestad L

doi

10.1016/j.ijcard.2016.08.237

subject

Has Abstract

pub_date

2016-11-15 00:00:00

pages

688-692

eissn

0167-5273

issn

1874-1754

pii

S0167-5273(16)31944-1

journal_volume

223

pub_type

杂志文章

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