Key result
Higher plasma fibulin-1 levels in patients with severe aortic stenosis undergoing AVR were associated with an increased restrictive LV filling pattern (2% vs 29% vs 24% across tertiles, P=0.004).
Why the study?
Are plasma fibulin-1 levels associated with restrictive LV filling, reduced systolic function, and mortality in patients with severe aortic stenosis undergoing AVR?
Cohort (n=125)
Are plasma fibulin-1 levels associated with restrictive LV filling, reduced systolic function, and mortality in patients with severe aortic stenosis undergoing AVR?
Absolute Event Rate: 24% vs 2%
p-value: p=0.004
Higher preoperative plasma fibulin-1 levels are associated with restrictive LV filling, reduced longitudinal systolic function, and increased filling pressures in patients with severe aortic stenosis undergoing AVR.
May flag worse pre-AVR diastolic function; leaves open fibulin-1's prognostic value or role in management.
BACKGROUND: Plasma fibulin-1 levels have been associated with N-terminal pro-B-type natriuretic peptide levels and left atrial size and shown to be predictive of mortality in patients with diabetes. The mechanisms behind these connections are not fully understood but are probably related to its roles as an extracellular matrix protein in cardiovascular tissues. METHODS AND RESULTS: One hundred twenty-five patients with severe aortic stenosis who were scheduled for aortic valve replacement (AVR) were evaluated with preoperative echocardiography and their plasma fibulin-1 levels were determined with ELISA. The cohort was followed for a median of 4 years after AVR. Increased restrictive left ventricular (LV) filling pattern was observed with increased plasma fibulin-1 levels (2% versus 29% versus 24% in low, middle, and high plasma fibulin-1 tertile groups, P=0.004). Likewise, reduced longitudinal systolic LV function (6.6 ± 1.1 versus 6.1 ± 1.3 versus 5.7 ± 1.5 cm/s, P=0.05) and increased LV filling pressures was systolic velocity of the mitral annulus observed with increasing plasma fibulin-1 concentrations (ratio of early transmitral flow velocity to early diastolic flow velocity of the mitral annulus 13 ± 4 versus 15 ± 5 versus 16 ± 6 in the fibulin-1 tertile groups, P=0.04). CONCLUSIONS: In patients with symptomatic severe aortic stenosis undergoing AVR, plasma fibulin-1 is associated with restrictive filling of the LV, decreased longitudinal systolic function of the LV, and increased LV filling pressures. CLINICAL TRIAL REGISTRATION: URL: http://www.clinicaltrial.gov with Identifier: NCT00294775.
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Dahl et al. (2012) conducted a cohort in Severe aortic stenosis (n=125). Plasma fibulin-1 (exposure) vs. Low plasma fibulin-1 tertile was evaluated on Restrictive left ventricular filling pattern (p=0.004). Higher plasma fibulin-1 levels in patients with severe aortic stenosis undergoing AVR were associated with an increased restrictive LV filling pattern (2% vs 29% vs 24% across tertiles, P=0.004).
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