Abstract
The limitation of aortic size-based criteria is gradually recognized in the prediction of aortic events especially in bicuspid aortic valve (BAV) cohorts, while most aortic events happen in patients with proximal aortic diameters <50 mm. Circulating microRNAs (miRs) have been addressed as a novel tool to improve risk stratification in patients with different aortopathies. We aimed to elucidate the correlation between peripheral whole blood and aortic tissue miRs in order to prove the potential availability as a biomarker in the clinical routine. All patients who received elective aortic valve repair/replacement ± proximal aortic replacement to BAV disease (n = 65, 2013-2018) were prospectively included. The expression of 10 miRs (miR-1, miR-17, miR-18a, miR-19a, miR-20a, miR-21, miR-106a, miR-133a, miR-143 and miR-145) was analyzed in the intraoperatively acquired aortic tissue as well as in the peripheral blood before the surgery. We found a significant correlation between circulating miRs in the peripheral blood and aortic tissue levels of miR-21 (r = 0.293, p = 0.02), miR-133a (r = 0.43, p = 0.02), miR-143 (r = 0.68, p < 0.001), and miR-145 (r = 0.68, p < 0.001). Further, the multivariate logistic regression analysis revealed an association between blood and aortic tissue miR-143 levels each other (Odds Ratio [OR] 1.29, 95% Confidence Interval [CI] 1.11-1.67, p = 0.02; OR 1.36, 95% CI 1.19-2.01, p = 0.03, respectively) and a blood/aortic miR-143 level to dilated aorta (OR 3.61, 95% CI 1.62-9.02, p = 0.01; OR 2.92, 95% CI 1.81-7.05, p = 0.02, respectively). Our study demonstrates a significant correlation between peripheral whole blood and aortic tissue miRs, confirming the hypothesis that circulating miRs may reflect remodeling processes in the proximal aorta in bicuspid aortopathy patients.
Highlights
Bicuspid aortic valve (BAV) associated aortic aneurysm, so-called “bicuspid aortic valve (BAV)-aortopathy” is accompanied with an increased risk of aortic events
Proximal aortic dimensions were assessed by means of transthoracic/transesophageal echocardiography, computed tomography (CT) or magnetic resonance imaging (MRI)
Our study cohorts included a total of 47 consecutive BAV and 2 unicuspid aortic valve (UAV) patients referred to our institution for elective aortic valve surgery with or without concomitant proximal aortic surgery
Summary
Bicuspid aortic valve (BAV) associated aortic aneurysm, so-called “BAV-aortopathy” is accompanied with an increased risk of aortic events. Blood microRNAs (miRs) are potential biomarkers to improve risk stratification in BAV-aortopathy [3]. The limitation of aortic size-based criteria is gradually recognized in the prediction of aortic events especially in bicuspid aortic valve (BAV) cohorts, while most aortic events happen in patients with proximal aortic diameters
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