Corpus.ulaval.ca
Effect of Age and Aortic Valve Anatomy on Calcification and Haemodynamic Severity of Aortic StenosisMylène Shen1, BSc, Lionel Tastet1, MSc, Romain Capoulade1, PhD, ?ric Larose1 DVM, MD, ?lisabeth Bédard1, MD, Marie Arsenault1, MD, Philippe Chetaille2, MD, Jean G. Dumesnil1, MD, Patrick Mathieu1, MD, Marie-Annick Clavel1, DVM, PhD, Philippe Pibarot1, DVM, PhD1 Institut Universitaire de Cardiologie et de Pneumologie de Québec / Quebec Heart & Lung Institute, Laval University, Quebec City, Quebec, Canada.2 Department of Pediatrics, Centre Mère Enfants Soleil, Centre Hospitalier Universitaire de Québec, Laval University, Quebec City, Quebec, CanadaCorrespondence to : Dr. Philippe PibarotInstitut Universitaire de Cardiologie et de Pneumologie de Québec, 2725 Chemin Sainte-Foy, Quebec City, Quebec, Canada, G1V 4G5.Telephone number: 418-656-8711 (ext. 5938)Fax number: 418-656-4918E-mail address: philippe.pibarot@med.ulaval.ca Key words: Aortic stenosis, Bicuspid aortic valve, Tricuspid aortic valve, Aortic valve calcificationWord count (excluding title page, abstract, references, figures & tables): 3341The Corresponding Author has the right to grant on behalf of all authors and does grant on behalf of all authors, an exclusive licence on a worldwide basis to the BMJ Publishing Group Ltd and its Licensees to permit this article to be published in HEART editions and any other BMJPGL products to exploit all subsidiary rights. ABSTRACTObjective: To evaluate the effect of age and aortic valve anatomy (tricuspid [TAV] versus bicuspid [BAV] aortic valve) on the relationship between the aortic valve calcification (AVC) and the hemodynamic parameters of aortic stenosis (AS) severity.Methods: Two hundred patients with AS and preserved left ventricular ejection fraction were prospectively recruited in the PROGRESSA (Metabolic Determinants of the Progression of Aortic Stenosis) study and underwent a comprehensive Doppler echocardiography and multidetector computed tomography (MDCT). Mean transvalvular gradient (MG) measured by Doppler echocardiography was used to assess AS hemodynamic severity and AVC was evaluated by MDCT using the Agatston method and indexed to the left ventricular outflow tract area to obtain AVC density (AVCd). All analyses were adjusted for sex. Results: Thirty-nine patients had a BAV and 161 a TAV. Median age was 51 and 72 years for BAV and TAV patients respectively. There was a modest correlation between MG and AVCd (ρ=0.51, p<0.0001) in the whole cohort. After dichotomization for valve anatomy, there was a good correlation between AVCd and MG in the TAV group (ρ=0.61, p<0.0001) but weak correlation in the BAV group (ρ=0.32, p=0.046). In the TAV group, the strength of the AVCd-MG correlation was similar in younger (<72 years old; ρ=0.59, p<0.0001) versus older (≥72 years old; ρ=0.61, p<0.0001) patients. In the BAV group, there was no correlation between AVCd and MG in younger patients (<51 years old; ρ=0.12, p=0.65), whereas there was a good correlation in older patients (≥51 years old; ρ=0.55, p=0.009). AVCd (p=0.005) and age (p=0.02) were both independent determinants of MG in BAV patients while AVCd (p<0.0001) was the only independent determinant of MG in TAV patients.Conclusion: In patients with TAV as well as in older patients with BAV, AVCd appears to be the main factor significantly associated with the hemodynamic severity of AS and so it may be used to corroborate AS severity in case of uncertain or discordant findings at echocardiography. However, among younger patients with BAV, some may have a hemodynamically significant stenosis with minimal AVCd. The results of MDCT AVCd should thus be interpreted cautiously in this subset of patients. KEY MESSAGESWhat is already known on the subject?Aortic valve calcification (AVC) measured by computed tomography is well correlated to the hemodynamic parameters of aortic stenosis (AS) assessed by Doppler echocardiography. In patients with a discordant grading severity of AS at Doppler echocardiography, AVC can be useful to determine the actual severity of the stenosis i.e. truly severe or moderate AS. However, the effect of age and aortic valve anatomy of the patients remain unknown on this correlation between AVC and hemodynamic severity.What might this study add?This study shows that independently of age, AVC is an independent predictor and is well correlated to mean transvalvular gradient (MG) in patients with a tricuspid aortic valve (TAV). In bicuspid aortic valve (BAV) patients, AVC is an independent determinant of MG but only in older patients. How might this impact on clinical practice?AVC may be useful to corroborate AS severity in patients with discordant findings at echocardiography in TAV as well as in older BAV patients. In younger BAV patients, some may have a hemodynamically significant stenosis with no or minimal AVC. The results of AVC measured by computed tomography should thus be interpreted with caution in this subset of patients.INTRODUCTIONBicuspid aortic valve (BAV), characterized by a two-leaflet aortic valve instead of a tri-leaflet aortic valve, is the most common congenital heart disease and affects 1-2% of the population. ADDIN EN.CITE <EndNote><Cite><Author>Roberts</Author><Year>1970</Year><RecNum>6762</RecNum><DisplayText>(1)</DisplayText><record><rec-number>6762</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963351">6762</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Roberts, C.</author></authors></contributors><titles><title>The congenitally bicuspid aortic valve: a study of 85 autopsy cases.</title><secondary-title>Am J Cardiol</secondary-title></titles><periodical><full-title>Am J Cardiol</full-title></periodical><pages>72-83</pages><volume>26</volume><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic valve</keyword><keyword>Valve</keyword></keywords><dates><year>1970</year><pub-dates><date>1970</date></pub-dates></dates><label>6913</label><urls></urls></record></Cite></EndNote>(1) This condition is known to be associated with multiple vascular and/or valvular dysfunctions such as calcific aortic stenosis (AS), aortic regurgitation or dilatation of the aorta. ADDIN EN.CITE <EndNote><Cite><Author>Braverman</Author><Year>2005</Year><RecNum>7598</RecNum><DisplayText>(2)</DisplayText><record><rec-number>7598</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963353">7598</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Braverman, A.C.</author><author>Guven, H.</author><author>Beardslee, M.A.</author><author>Makan, M.</author><author>Kates, A.M.</author><author>Moon, M.R.</author></authors></contributors><titles><title>The bicuspid aortic valve</title><secondary-title>Curr. Probl. Cardiol</secondary-title></titles><periodical><full-title>Curr. Probl. Cardiol</full-title></periodical><pages>470-522</pages><volume>30</volume><number>9</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic valve</keyword><keyword>Valve</keyword></keywords><dates><year>2005</year><pub-dates><date>9/2005</date></pub-dates></dates><label>7764</label><urls></urls></record></Cite></EndNote>(2) AS is the third most common cardiovascular disease in the developed countries, ADDIN EN.CITE <EndNote><Cite><Author>Sawaya</Author><Year>2012</Year><RecNum>0</RecNum><IDText>Aortic stenosis: a contemporary review</IDText><DisplayText>(3)</DisplayText><record><dates><pub-dates><date>Jun</date></pub-dates><year>2012</year></dates><keywords><keyword>Animals</keyword><keyword>Aortic Valve Stenosis/*diagnosis/epidemiology/*surgery</keyword><keyword>*Cardiac Catheterization/methods</keyword><keyword>Clinical Trials as Topic/methods</keyword><keyword>Disease Progression</keyword><keyword>Heart Valve Prosthesis/trends</keyword><keyword>*Heart Valve Prosthesis Implantation/methods</keyword><keyword>Humans</keyword></keywords><isbn>0002-9629</isbn><titles><title>Aortic stenosis: a contemporary review</title><secondary-title>Am J Med Sci</secondary-title><alt-title>The American journal of the medical sciences</alt-title></titles><pages>490-6</pages><number>6</number><contributors><authors><author>Sawaya, F.</author><author>Liff, D.</author><author>Stewart, J.</author><author>Lerakis, S.</author><author>Babaliaros, V.</author></authors></contributors><edition>2012/06/12</edition><language>eng</language><added-date format="utc">1384179554</added-date><ref-type name="Journal Article">17</ref-type><auth-address>Department of Internal Medicine, Division of Cardiology, Emory University Hospital, Atlanta, GA 30322, USA.</auth-address><remote-database-provider>NLM</remote-database-provider><rec-number>49</rec-number><last-updated-date format="utc">1384179554</last-updated-date><accession-num>22683616</accession-num><electronic-resource-num>10.1097/MAJ.0b013e3182539d70</electronic-resource-num><volume>343</volume></record></Cite></EndNote>(3) affecting 2 to 4% of the population over 65 years old and nearly 10% of the population over 80 years old.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5FdmVib3JuPC9BdXRob3I+PFllYXI+MjAxMzwvWWVhcj48
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ADDIN EN.CITE.DATA (1, 8-11) Until now, there is no pharmacological treatment available to slow down or to stop the progression of AS and the only available treatment is the implantation of a prosthetic heart valve. ADDIN EN.CITE <EndNote><Cite><Author>Nishimura</Author><Year>2014</Year><RecNum>14149</RecNum><DisplayText>(12)</DisplayText><record><rec-number>14149</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963366">14149</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Nishimura, R.A.</author><author>Otto, C.M.</author><author>Bonow, R.O.</author><author>Carabello, B.A.</author><author>Erwin, J.P., III</author><author>Guyton, R.A.</author><author>O'Gara, P.T.</author><author>Ruiz, C.E.</author><author>Skubas, N.J.</author><author>Sorajja, P.</author><author>Sundt, T.M., III</author><author>Thomas, J.D.</author></authors></contributors><titles><title>2014 AHA/ACC guideline for the management of patients with valvular heart disease: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines</title><secondary-title>J Am Coll Cardiol</secondary-title></titles><periodical><full-title>J Am Coll Cardiol</full-title></periodical><pages>e57-185</pages><volume>63</volume><number>22</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>ASSOCIATION</keyword><keyword>DISEASE</keyword><keyword>Heart</keyword><keyword>Heart disease</keyword></keywords><dates><year>2014</year><pub-dates><date>6/10/2014</date></pub-dates></dates><label>14468</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(12) According to the 2014 AHA/ACC practice guidelines, patients with symptoms and a severe AS have a class I indication for aortic valve replacement. ADDIN EN.CITE <EndNote><Cite><Author>Nishimura</Author><Year>2014</Year><RecNum>14149</RecNum><DisplayText>(12)</DisplayText><record><rec-number>14149</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963366">14149</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Nishimura, R.A.</author><author>Otto, C.M.</author><author>Bonow, R.O.</author><author>Carabello, B.A.</author><author>Erwin, J.P., III</author><author>Guyton, R.A.</author><author>O'Gara, P.T.</author><author>Ruiz, C.E.</author><author>Skubas, N.J.</author><author>Sorajja, P.</author><author>Sundt, T.M., III</author><author>Thomas, J.D.</author></authors></contributors><titles><title>2014 AHA/ACC guideline for the management of patients with valvular heart disease: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines</title><secondary-title>J Am Coll Cardiol</secondary-title></titles><periodical><full-title>J Am Coll Cardiol</full-title></periodical><pages>e57-185</pages><volume>63</volume><number>22</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>ASSOCIATION</keyword><keyword>DISEASE</keyword><keyword>Heart</keyword><keyword>Heart disease</keyword></keywords><dates><year>2014</year><pub-dates><date>6/10/2014</date></pub-dates></dates><label>14468</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(12) Doppler echocardiography is routinely used in clinical practice and is the reference method to assess the hemodynamic severity of AS. Parameters such as peak aortic jet velocity, mean transvalvular gradient (MG) and aortic valve area are the criteria commonly used; however, about 30% of the patients with AS present a discordance between these parameters of AS severity.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5NaW5uZXJzPC9BdXRob3I+PFllYXI+MjAwODwvWWVhcj48
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ZT4A
ADDIN EN.CITE.DATA (13, 14) The most frequent discordance is the combination of a low MG (<40 mmHg) suggesting a moderate AS with a small aortic valve area (<1.0 cm?) rather consistent with a severe AS.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5DbGF2ZWw8L0F1dGhvcj48WWVhcj4yMDEzPC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (14, 17-20) Aggarwal & Clavel et al. recently reported that this relationship is different in men versus women i.e. women reach hemodynamically severe AS with less amount of AVC. ADDIN EN.CITE <EndNote><Cite><Author>Aggarwal</Author><Year>2013</Year><RecNum>13209</RecNum><DisplayText>(21)</DisplayText><record><rec-number>13209</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963364">13209</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Aggarwal, S.R.</author><author>Clavel, M.A.</author><author>Messika-Zeitoun, D.</author><author>Cueff, C.</author><author>Malouf, J.</author><author>Araoz, P.A.</author><author>Mankad, R.</author><author>Michelena, H.</author><author>Vahanian, A.</author><author>Enriquez-Sarano, M.</author></authors></contributors><titles><title>Sex differences in aortic valve calcification measured by multidetector computed tomography in aortic stenosis</title><secondary-title>Circ Cardiovasc Imaging</secondary-title></titles><periodical><full-title>Circ Cardiovasc Imaging</full-title></periodical><pages>40-47</pages><volume>6</volume><number>1</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic valve</keyword><keyword>aortic valve calcification</keyword><keyword>Valve</keyword><keyword>VALVE CALCIFICATION</keyword><keyword>Calcification</keyword><keyword>Tomography</keyword><keyword>Aortic stenosis</keyword><keyword>Stenosis</keyword><keyword>Computed tomography</keyword></keywords><dates><year>2013</year><pub-dates><date>2013</date></pub-dates></dates><label>13465</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(21) This difference persisted even after indexing the AVC for body surface area or the cross-sectional area of the aortic annulus (AVC density). ADDIN EN.CITE <EndNote><Cite><Author>Clavel</Author><Year>2013</Year><RecNum>13583</RecNum><DisplayText>(14)</DisplayText><record><rec-number>13583</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963365">13583</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Clavel, M.A.</author><author>Messika-Zeitoun, D.</author><author>Pibarot, P.</author><author>Aggarwal, S.</author><author>Malouf, J.</author><author>Araoz, P.</author><author>Michelena, H.</author><author>Cueff, C.</author><author>Larose, ?.</author><author>Capoulade, R.</author><author>Vahanian, A.</author><author>Enriquez-Sarano, M.</author></authors></contributors><titles><title>The complex nature of discordant severe calcified aortic valve disease grading: New insights from combined Doppler-echocardiographic and computed tomographic study</title><secondary-title>J Am Coll Cardiol</secondary-title></titles><periodical><full-title>J Am Coll Cardiol</full-title></periodical><pages>2329-2338</pages><volume>62</volume><number>24</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic valve</keyword><keyword>Valve</keyword><keyword>DISEASE</keyword><keyword>Combined</keyword></keywords><dates><year>2013</year><pub-dates><date>12/17/2013</date></pub-dates></dates><label>13890</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(14) However, the effect of age and of the aortic valve anatomy (i.e. BAV versus TAV) on the relationship between AVC and hemodynamic parameters of AS severity has yet to be evaluated.METHODSPatient populationTwo hundred patients with AS and preserved left ventricular ejection fraction (LVEF) were prospectively recruited in the PROGRESSA (Metabolic Determinants of the Progression of Aortic Stenosis) study (Clinical Trial register: NCT01679431) between 2005 and 2015. The PROGRESSA study is an observational cohort study focusing on the identification of metabolic determinants as well as imaging biomarkers of the progression of AS.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5DYXBvdWxhZGU8L0F1dGhvcj48WWVhcj4yMDE0PC9ZZWFy
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ADDIN EN.CITE.DATA (22-24) Patients underwent a comprehensive Doppler echocardiography and MDCT within a period of 3 months. The inclusion criteria were age >21 and peak aortic jet velocity >2.0 m/s. Patients were excluded if they had symptomatic AS, moderate to severe aortic regurgitation, significant mitral valve disease (mitral stenosis or moderate to severe mitral regurgitation), LVEF <50%, rheumatic valvular disease or endocarditis, previous aortic/mitral valve repair or replacement, previous ascending aorta repair or replacement and if they were pregnant or lactating. The study was approved by the Ethics Committee of the Quebec Heart and Lung Institute and patients signed a written informed consent at the time of inclusion. Clinical dataClinical data included age, sex, height, weight, body surface area, body mass index, systolic and diastolic blood pressures, previous diagnosis of hypertension (patients receiving antihypertensive medications or having known but untreated hypertension [blood pressure ≥ 140/90 mmHg]), dyslipidemia (patients receiving cholesterol-lowering medication), diabetes (patients receiving anti-diabetic medication), coronary artery disease (history of myocardial infarction or coronary artery stenosis on coronary angiography defined as at least one lesion ≥ 50%) and history of smoking. Doppler echocardiography dataAll Doppler echocardiographic exams were performed and analyzed in the same laboratory according to the current recommendations of the American Society of Echocardiography. ADDIN EN.CITE <EndNote><Cite><Author>Baumgartner</Author><Year>2009</Year><RecNum>11213</RecNum><DisplayText>(25)</DisplayText><record><rec-number>11213</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963361">11213</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Baumgartner, H.</author><author>Hung, J.</author><author>Bermejo, J.</author><author>Chambers, J.B.</author><author>Evangelista, A.</author><author>Griffin, B.P.</author><author>Iung, B.</author><author>Otto, C.M.</author><author>Pellikka, P.A.</author><author>Quinones, M.</author></authors></contributors><titles><title>Echocardiographic assessment of valve stenosis: EAE/ASE recommendations for clinical practice</title><secondary-title>J Am Soc Echocardiogr</secondary-title></titles><periodical><full-title>J Am Soc Echocardiogr</full-title></periodical><pages>1-23</pages><volume>22</volume><number>1</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Assessment</keyword><keyword>clinical</keyword><keyword>Stenosis</keyword><keyword>Valve</keyword></keywords><dates><year>2009</year><pub-dates><date>1/2009</date></pub-dates></dates><label>11445</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(25) Stroke volume was calculated by multiplying the left ventricular outflow tract (LVOT) area by the velocity time integral obtained by pulsed wave Doppler in the LVOT and was indexed to body surface area (stroke volume index). The LVOT diameter was measured at the base of the valve leaflets and was used to calculate the LVOT area i.e. cross-sectional area of the aortic annulus. The Doppler echocardiographic parameters of AS severity included peak aortic jet velocity measured by continuous wave Doppler, MG obtained with the modified Bernoulli equation and aortic valve area calculated by the standard continuity equation. As a measurement of global left ventricular hemodynamic load, we calculated the valvulo-arterial impedance according to the formula: (systolic blood pressure + MG) / stroke volume index. Finally, the systemic arterial compliance was calculated according to the formula: stroke volume index / (systolic blood pressure – diastolic blood pressure).Multidetector Computed Tomography (MDCT) data Non-contrast MDCT scans were performed with a dual source MDCT scanner (Somatom Definition, Siemens Medical systems, Fordheim, Germany). The acquisitions were performed and analyzed by trained technicians blinded to the clinical, laboratory and Doppler echocardiography data. The protocol for the acquisition and interpretation of MDCT scans were previously described. ADDIN EN.CITE <EndNote><Cite><Author>Clavel</Author><Year>2013</Year><RecNum>13583</RecNum><DisplayText>(14)</DisplayText><record><rec-number>13583</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963365">13583</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Clavel, M.A.</author><author>Messika-Zeitoun, D.</author><author>Pibarot, P.</author><author>Aggarwal, S.</author><author>Malouf, J.</author><author>Araoz, P.</author><author>Michelena, H.</author><author>Cueff, C.</author><author>Larose, ?.</author><author>Capoulade, R.</author><author>Vahanian, A.</author><author>Enriquez-Sarano, M.</author></authors></contributors><titles><title>The complex nature of discordant severe calcified aortic valve disease grading: New insights from combined Doppler-echocardiographic and computed tomographic study</title><secondary-title>J Am Coll Cardiol</secondary-title></titles><periodical><full-title>J Am Coll Cardiol</full-title></periodical><pages>2329-2338</pages><volume>62</volume><number>24</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic valve</keyword><keyword>Valve</keyword><keyword>DISEASE</keyword><keyword>Combined</keyword></keywords><dates><year>2013</year><pub-dates><date>12/17/2013</date></pub-dates></dates><label>13890</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(14) Briefly, a scan run consisted of a prospective acquisition of contiguous transverse slices, with a thickness of 3 mm and triggered at 60-80% of the electrocardiographic R-to-R wave interval. 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ADDIN EN.CITE.DATA (26) For measurement of AVC, we paid particular attention to exclude any calcification from the aorta wall, the mitral valve annulus or the coronary arteries, so that AVC only included calcification of the aortic valve leaflets. Calcification was defined as 4 adjacent pixels with density >130 Hounsfield units. AVC load was summated from all contiguous MDCT planes and was expressed as an absolute value or as AVC density (AVCd). ADDIN EN.CITE <EndNote><Cite><Author>Clavel</Author><Year>2013</Year><RecNum>13583</RecNum><DisplayText>(14)</DisplayText><record><rec-number>13583</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963365">13583</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Clavel, M.A.</author><author>Messika-Zeitoun, D.</author><author>Pibarot, P.</author><author>Aggarwal, S.</author><author>Malouf, J.</author><author>Araoz, P.</author><author>Michelena, H.</author><author>Cueff, C.</author><author>Larose, ?.</author><author>Capoulade, R.</author><author>Vahanian, A.</author><author>Enriquez-Sarano, M.</author></authors></contributors><titles><title>The complex nature of discordant severe calcified aortic valve disease grading: New insights from combined Doppler-echocardiographic and computed tomographic study</title><secondary-title>J Am Coll Cardiol</secondary-title></titles><periodical><full-title>J Am Coll Cardiol</full-title></periodical><pages>2329-2338</pages><volume>62</volume><number>24</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic valve</keyword><keyword>Valve</keyword><keyword>DISEASE</keyword><keyword>Combined</keyword></keywords><dates><year>2013</year><pub-dates><date>12/17/2013</date></pub-dates></dates><label>13890</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(14) Total radiation exposure related to this study was <4 mSV.Statistical analysisThe continuous variables were tested for normality of distribution and homogeneity of variances with the Shapiro-Wilk and Levene tests, respectively. Continuous data were expressed as mean ± standard deviation. AVC and AVCd were expressed as median [interquartile range] and transformed with the use of square root for normalization. Comparisons between aortic valve anatomy groups (TAV vs. BAV) were done with Student’s t-test or Wilcoxon-Mann-Whitney test as appropriate. Categorical data were expressed as percentage and compared with the Chi-square test or Fisher’s exact test as appropriate. The TAV and BAV groups were subdivided into 2 subgroups according to the respective median of age (72 years for TAV and 51 years for BAV). To assess the relationship between anatomic and hemodynamic severity of AS, we analyzed the correlations between AVCd and MG using Spearman’s rank correlation coefficients (ρ, rho coefficient). Multivariable linear regression analyses were used to identify the independent determinants of MG among age, AVCd, aortic valve anatomy (BAV vs. TAV), anthropometric parameters (height, weight, body surface area, and body mass index), and risk factors including hypertension, diabetes, dyslipidemia, history of smoking, and coronary artery disease. Age, sex, AVCd, and valve anatomy were forced into the multivariable models, whereas other factors were entered in the models if their p value on univariable analysis was <0.10. Statistical analyses were performed with SPSS (version 23, SPSS, Chicago, Illinois) and SigmaPlot (version 11.0, Systat Software, San Jose, California) and a p value <0.05 was considered statistically significant.RESULTSCharacteristics of the study populationThe clinical, Doppler echocardiography and MDCT data of the study population are presented in Table 1. Among the 200 patients included in this study, 161 (80%) patients had a TAV and 39 (20%) patients had a BAV. The mean age was 67±13 years, with the TAV patients being older than the BAV patients (71±9 vs 49±11 years, p<0.0001). Men represented 73% of the total cohort, accounting for 76% of the TAV patients and 56% of the BAV patients (p=0.01). The BAV group had significantly lower body mass index (p=0.01) and systolic blood pressure (p=0.0004) and lower prevalence of hypertension (p<0.0001), dyslipidemia (p<0.0001), diabetes (p=0.003), coronary artery disease (p<0.0001) and history of smoking (p=0.04) than the TAV group. However, BAV patients presented higher diastolic blood pressure (p=0.002) and heart rate (p=0.03). With regards to Doppler echocardiography data, BAV patients had a significantly larger LVOT diameter (p=0.002), higher systemic arterial compliance (p<0.0001), lower valvulo-arterial impedance (p=0.002), higher stroke volume index (p=0.02), peak aortic jet velocity (p=0.01) and MG (p=0.002). However, aortic valve area, indexed aortic valve area and left ventricular ejection fraction were similar in both groups (all p>0.05). AVCd was significantly higher (p=0.01) in the TAV group than in the BAV group, whereas there was a trend (p=0.08) toward a higher AVC in the TAV group. Thus, BAV patients had less valvular calcification despite similar hemodynamic severity of AS.Relationship between valve calcification and hemodynamic severity There was a modest association between MG and AVCd in the whole cohort (ρ=0.51, p<0.0001; Online Figure 1). However there were significant interactions between AVCd and age (p=0.0006) and between AVCd and aortic valve anatomy (p=0.002) with regards to the relationship with MG. After stratification for sex, these interactions remained statistically significant for both age (p=0.0006) and aortic valve anatomy (p=0.002).After dichotomization according to the valve anatomy, the TAV group showed a good AVCd-MG correlation (ρ=0.61, p<0.0001; Figure 1), whereas there was a weak correlation in the BAV group (ρ=0.32, p=0.046; Figure 2). The strength of the correlation was similar in the younger (n=77) (<72 years old [median of age in the TAV group]; ρ=0.59, p<0.0001; Figure 3 and Online Figure 2) and in the older (n=84) (≥72 years old; ρ=0.61, p<0.0001; Figure 4 and Online Figure 2) TAV patients. However, in the BAV patients, no correlation was found between MG and AVCd in the younger patients (n=18) (<51 years old [median of age in the BAV group]; ρ=0.12, p=0.65; Figure 5 and Online Figure 3) while there was a good correlation in the older patients (n=21) (≥51 years old; ρ=0.55, p=0.009; Figure 6 and Online Figure 4). Of note, the majority of false negative cases with MDCT (i.e. cases with low AVCd score despite a significant MG) were young women with a BAV. Out of seven people with a MG ≥ 18 mmHg and an AVC score equal to zero, five were young women with BAV. Similar correlations and results were obtained when using the non-indexed AVC scores.Determinants of AS hemodynamic severity Linear univariable and multivariable analyses are presented in Table 2. In the whole cohort, the independent determinants of higher MG were age (p=0.02), BAV anatomy (p=0.04) and higher AVCd (p<0.0001). In the TAV group as well as in the subgroup of older patients (≥72 years old), AVCd was the only independent determinant of higher MG (all p<0.0001). In the subgroup of younger patients (<72 years old), AVCd (p<0.0001) remained an independent determinant of higher MG while diabetes (p=0.02) was an independent determinant of lower MG. In the BAV group, higher AVCd (p=0.005) and older age (p=0.02) were independent determinants of higher MG. In the BAV age subgroups (<51 and ≥51 years old), AVCd remained independently associated with a higher MG only in the older BAV patients (p=0.002). These results remained similar after stratification for sex.DISCUSSIONThe main findings of this study are that AVCd is an independent predictor of MG in TAV patients independently of age whereas in the BAV patients there was a major interaction between AVCd and age on determining MG. Indeed, association between AVCd and MG was strong in TAV patients and older BAV patients whereas there was no association between AVCd and MG in the young BAV patients. Effect of valve anatomy and age on the relationship between hemodynamic and anatomic severity Subjects with BAV are more susceptible of developing AS than subjects with TAV and they develop the disease generally one decade earlier compared to TAV subjects.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5GZW5vZ2xpbzwvQXV0aG9yPjxZZWFyPjE5Nzc8L1llYXI+
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ADDIN EN.CITE.DATA (8-11) This explains the major differences found in the present study between the BAV and TAV groups with respect to age and prevalence of comorbidities examined in the present study.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5CcmlhbmQ8L0F1dGhvcj48WWVhcj4yMDA1PC9ZZWFyPjxS
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ADDIN EN.CITE.DATA (14, 21) The results of the present study further confirm these previous findings. Furthermore, the subanalyses presented in this study with respect to aortic valve anatomy and age reveals new insights into the complex relationship between anatomic and hemodynamic severity of AS. A previous study by Roberts et al. reported in aortic valves retrieved at necropsy that BAV patients had more severely calcified and remodelled valves than TAV patients as assessed by the pathologist. ADDIN EN.CITE <EndNote><Cite><Author>Roberts</Author><Year>2013</Year><RecNum>15173</RecNum><DisplayText>(29)</DisplayText><record><rec-number>15173</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1462386633">15173</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Roberts, W. C.</author><author>Vowels, T. J.</author><author>Filardo, G.</author><author>Ko, J. M.</author><author>Mathur, R. P.</author><author>Shirani, J.</author></authors></contributors><auth-address>Baylor Heart and Vascular Institute, Baylor University Medical Center, Dallas, TX, USA. wc.roberts@baylorhealth.edu</auth-address><titles><title>Natural history of unoperated aortic stenosis during a 50-year period of cardiac valve replacement</title><secondary-title>Am J Cardiol</secondary-title><alt-title>The American journal of cardiology</alt-title></titles><periodical><full-title>Am J Cardiol</full-title></periodical><pages>541-53</pages><volume>112</volume><number>4</number><edition>2013/06/04</edition><keywords><keyword>Adolescent</keyword><keyword>Adult</keyword><keyword>Aged</keyword><keyword>Aged, 80 and over</keyword><keyword>Aortic Valve/*abnormalities</keyword><keyword>Aortic Valve Stenosis/*pathology</keyword><keyword>Autopsy</keyword><keyword>Female</keyword><keyword>Heart Diseases/pathology</keyword><keyword>Humans</keyword><keyword>Logistic Models</keyword><keyword>Male</keyword><keyword>Middle Aged</keyword><keyword>Organ Size</keyword><keyword>Risk Factors</keyword></keywords><dates><year>2013</year><pub-dates><date>Aug 15</date></pub-dates></dates><isbn>0002-9149</isbn><accession-num>23726174</accession-num><urls></urls><electronic-resource-num>10.1016/j.amjcard.2013.04.020</electronic-resource-num><remote-database-provider>NLM</remote-database-provider><language>eng</language></record></Cite></EndNote>(29) However, in this previous study, the BAV and TAV patients were not necessarily at the same stage of AS anatomic / hemodynamic severity. Furthermore, AVC was assessed visually in the study of Roberts et al. versus by a quantitative MDCT in the present study. On the other hand, a study showed in surgically explanted stenotic aortic valves that the fibrocalcific remodelling score was independently determined by the sex (male) and BAV. ADDIN EN.CITE <EndNote><Cite><Author>Cote</Author><Year>2011</Year><RecNum>14485</RecNum><DisplayText>(30)</DisplayText><record><rec-number>14485</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963366">14485</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Cote, N.</author><author>Couture, C.</author><author>Pibarot, P.</author><author>Despres, J.P.</author><author>Mathieu, P.</author></authors></contributors><titles><title>Angiotensin receptor blockers are associated with a lower remodelling score of stenotic aortic valves</title><secondary-title>Eur J Clin. Invest</secondary-title></titles><periodical><full-title>Eur J Clin. Invest</full-title></periodical><pages>1172-1179</pages><volume>41</volume><number>11</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Angiotensin</keyword><keyword>Receptor</keyword></keywords><dates><year>2011</year><pub-dates><date>11/2011</date></pub-dates></dates><label>14808</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(30) In the present study, we found that despite having higher MG, BAV patients had lower AVCd (p=0.01). Also, following adjustment we identified that BAV was independently related with MG. In the BAV group AVCd was associated with MG but only in the older group (≥51 years). Taken together, these data suggest that: i) AVCd is good correlate of hemodynamic severity of AS in TAV and older BAV patients (≥51 years), ii) BAV is independently related to AS severity despite lower AVCd level and iii) fibrosis of aortic valve leaflets, which is not evaluated with MDCT, may play a significant role to determine AS severity particularly in younger BAV patients. This latter point is supported by the fact that despite having lower amount of calcium as evaluated by MDCT, BAVs have higher remodelling score. ADDIN EN.CITE <EndNote><Cite><Author>Cote</Author><Year>2011</Year><RecNum>14485</RecNum><DisplayText>(30)</DisplayText><record><rec-number>14485</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963366">14485</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Cote, N.</author><author>Couture, C.</author><author>Pibarot, P.</author><author>Despres, J.P.</author><author>Mathieu, P.</author></authors></contributors><titles><title>Angiotensin receptor blockers are associated with a lower remodelling score of stenotic aortic valves</title><secondary-title>Eur J Clin. Invest</secondary-title></titles><periodical><full-title>Eur J Clin. Invest</full-title></periodical><pages>1172-1179</pages><volume>41</volume><number>11</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Angiotensin</keyword><keyword>Receptor</keyword></keywords><dates><year>2011</year><pub-dates><date>11/2011</date></pub-dates></dates><label>14808</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(30) Hence, it is likely that compared to TAV, fibrosis is accentuated in BAV and alter valve hemodynamics significantly. In this regard, in 477 surgically explanted stenotic aortic valves, C?té et al. identified that BAV anatomy was independently associated with higher fibrosis score. ADDIN EN.CITE <EndNote><Cite><Author>C?té</Author><Year>2014</Year><RecNum>13576</RecNum><DisplayText>(31)</DisplayText><record><rec-number>13576</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963365">13576</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>C?té, N.</author><author>Mahmut, A.</author><author>Fournier, D.</author><author>Pépin, A.</author><author>Couture, C.</author><author>Després, J.P.</author><author>Trahan, S.</author><author>Pagé, S.</author><author>Bossé, Y.</author><author>Pibarot, P.</author><author>Mathieu, P.</author></authors></contributors><titles><title>Angiotensin receptor blockers are associated with reduced fibrosis and interleukin-6 expression in calcific aortic valve disease</title><secondary-title>Pathobiology</secondary-title></titles><periodical><full-title>Pathobiology</full-title></periodical><pages>15-24</pages><volume>81</volume><number>1</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Angiotensin</keyword><keyword>Receptor</keyword><keyword>Fibrosis</keyword><keyword>Interleukin-6</keyword><keyword>Aortic valve</keyword><keyword>Valve</keyword><keyword>DISEASE</keyword></keywords><dates><year>2014</year><pub-dates><date>2014</date></pub-dates></dates><label>13883</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(31) In a small size study, Ferda et al. found a significant correlation between AVC and hemodynamic severity of AS but they did not find significant differences in AVC between BAV and TAV patients. 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ADDIN EN.CITE.DATA (20) In the latter study however, the investigators did not index AVC for the size of the aortic valve, as calculated by AVCd. Given that BAV patients generally have a larger LVOT and aortic annulus cross-sectional areas compared to TAV patients, this may explain, at least in part, the apparent discrepancy between the present findings and the study by Ferda et al.In patients with BAV, other factors besides calcification and fibrosis of leaflets may contribute to reduce the valve orifice and alter valvular hemodynamics. The morphology of the valve leaflets and the shape of the valve orifice are abnormal and may lead to a reduction in the effective valve orifice area and an increase in pressure gradient, independently of the presence of calcification and fibrosis. Moreover, in BAV patients, the transvalvular flow jet is often very eccentric and is directed toward the wall of the aortic root thus causing important flow turbulences and a significant pressure drop, even if the valve orifice area is only mildly or moderately reduced. ADDIN EN.CITE <EndNote><Cite><Author>Abbas</Author><Year>2015</Year><RecNum>14411</RecNum><DisplayText>(32)</DisplayText><record><rec-number>14411</rec-number><foreign-keys><key app="EN" db-id="a00r2xsprrpt07e2dt35s2ztfadevpxdd5s5" timestamp="1457963366">14411</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author>Abbas, A.E.</author><author>Franey, L.M.</author><author>Lester, S.</author><author>Raff, G.</author><author>Gallagher, M.J.</author><author>Hanzel, G.</author><author>Safian, R.D.</author><author>Pibarot, P.</author></authors></contributors><titles><title>The role of jet eccentricity in generating disproportionately elevated transaortic pressure gradients in patients with aortic stenosis</title><secondary-title>Echocardiography</secondary-title></titles><periodical><full-title>Echocardiography</full-title></periodical><pages>372-382</pages><volume>32</volume><number>2</number><reprint-edition>Not in File</reprint-edition><keywords><keyword>Aortic stenosis</keyword><keyword>Pressure</keyword><keyword>Pressure gradient</keyword><keyword>Stenosis</keyword></keywords><dates><year>2015</year><pub-dates><date>2/2015</date></pub-dates></dates><label>14734</label><urls><related-urls><url><style face="underline" font="default" size="100%">;(32) Hence, in younger BAV patients, AVCd does not appear to be the main causal factor of AS and other factors including abnormal valve orifice shape, fibrotic remodeling of valve leaflets and/or disturbed flow pattern may contribute to the hemodynamic severity of AS. Further work is needed to examine this hypothesis.We observed that most of the false negative patients at MDCT i.e patients with low or no calcification despite a significant MG at echocardiography were young women with BAV (five out of seven people with MG ≥18 mmHg and AVC = 0). Previous studies have shown that women reach hemodynamically severe AS with lower AVC and AVCd.PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BZ2dhcndhbDwvQXV0aG9yPjxZZWFyPjIwMTM8L1llYXI+
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ADDIN EN.CITE.DATA (14, 21) To explain these findings, some investigators have suggested that women may have relatively less valve calcification compared to men but more fibrosis on the valve leaflets. It is thus possible that in young women with BAV, the predominant cause of AS is pronounced valvular fibrosis with little or no calcification. Clinical implicationsMDCT is a non-invasive, simple, reproducible and accurate modality to assess AVC. This method may be useful to corroborate AS severity in patients who have uncertain or discordant findings at echocardiography. Our study shows that AVCd is the main determinant of hemodynamic severity in TAV patients, regardless of age, and in the older BAV patients. Older patients with AS have more comorbidities that may predispose to the development of LV diastolic and systolic dysfunction and thus contribute to reduce the stroke volume and transvalvular flow rate. Low flow state is the most frequent cause of discordant grading (i.e. small aortic valve area with low MG) at echocardiography. Furthermore, older patients with AS often have markedly reduced aortic compliance that may also contribute to an aortic valve area-MG discordance even in presence of normal flow. Hence, it is not surprising that up to 30% of AS patients have discordant grading of AS severity at echocardiography. This situation raises uncertainty about the actual severity of the disease and thus about the therapeutic management, particularly if the patient is symptomatic. The results of the present study confirm the clinical utility of AVCd measured by MDCT to corroborate stenosis severity in TAV patients as well as in older BAV patients presenting discordant findings at echocardiography. Our study also reveals that in the younger patients with BAV may have a significant hemodynamic severity despite no or little AVC at MDCT. Hence, the results of MDCT should be interpreted with caution in this subset of patients. LimitationsThe main limitation of the present study is the small sample size of BAV patients. This limits the statistical power of the sub-analyses with respect to valve anatomy and age. Also, we had few patients with a hemodynamically severe AS. Further studies with larger number of patients with severe AS will be necessary to determine whether the previously reported sex-related differences in the AVC-MG relationship PEVuZE5vdGU+PENpdGU+PEF1dGhvcj5BZ2dhcndhbDwvQXV0aG9yPjxZZWFyPjIwMTM8L1llYXI+
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ADDIN EN.CITE.DATA (14, 21) persist after exclusion of younger women with BAV.We carefully examined the valve morphology (TAV vs. BAV) in multiple views by echocardiography. Nevertheless, we cannot exclude that a few patients have been misclassified, especially in the subset of older patients with more extensive valve calcification. However, given that the correlation between gradient and AVCd was similar in older TAV patients vs. older BAV, patients, such mis-classification, if any, would have no impact on the results and conclusions of this study.CONCLUSION In patients with TAV and in older patients with BAV, AVCd appears to be the main factor significantly associated with the hemodynamic severity of AS. Hence in these patients, AVCd measured by MDCT may be used to corroborate AS severity in patients who have uncertain or discordant findings at echocardiography. However, among younger patients with BAV, some may have a hemodynamically significant stenosis with no/minimal AVC. The results of MDCT AVC should thus be interpreted with caution in this subset of patients.Acknowledgements We would like to thank Isabelle Fortin, Jocelyn Beauchemin, Céline Boutin, Louise Marois, Martine Poulin, Madeleine Dumont, Caroline Dionne, Martine Fleury, Martine Parent and Karine Bibeau, for their help in data collection and management.ContributorsMS: study management, acquisition, analysis and interpretation of the data, preparation of the manuscript. LT: participation in the study management and acquisition of the data and critical revisions of the manuscript. RC: participation in the study management and acquisition of the data and critical revisions on the manuscript. EL: analysis of the computed tomography exams. EB: analysis of the echocardiograms. MA: analysis of the echocardiograms. PC: critical revisions of the manuscript. JGD: critical revisions of the manuscript. PM: critical revisions of the manuscript. MAC: assistance in the data analyses and critical revisions of the manuscript. PP: principal investigator of the PROGRESSA Study, supervision of the data acquisition, analyses and interpretation, critical revisions of the manuscript and validation of its final version. Funding This work was supported by grants MOP-114997, MOP-2455048, and FDN-143225 from Canadian Institutes of Health Research (CIHR), Ottawa, Ontario, Canada and a grant from the Foundation of the Quebec Heart and Lung Institute. R.C. is supported by a post-doctoral fellowship grant from CIHR. E.L., M.A. and P.M. are research scholars from the Fonds de Recherche Québec – Santé (FRQS), Montreal, Québec, Canada. P.P. holds the Canada Research Chair in Valvular Heart Diseases from CIHR, Ottawa, Ontario, peting interestsThe authors have reported no relationships relevant to the content of this paper to disclose.Patient consent: obtained.Ethics approval: Ethics Committee of the Quebec Heart and Lung Institute.REFERENCES ADDIN EN.REFLIST 1.Roberts C. The congenitally bicuspid aortic valve: a study of 85 autopsy cases. Am J Cardiol. 1970;26:72-83.2.Braverman AC, Guven H, Beardslee MA, et al. The bicuspid aortic valve. Curr Probl Cardiol. 2005;30(9):470-522.3.Sawaya F, Liff D, Stewart J, et al. Aortic stenosis: a contemporary review. Am J Med Sci. 2012;343(6):490-6.4.Eveborn GW, Schirmer H, Heggelund G,et al. The evolving epidemiology of valvular aortic stenosis. The Tromso Study. Heart. 2013;99(6):396-400.5.Nkomo VT, Gardin JM, Skelton TN, et al. Burden of valvular heart diseases: a population-based study. Lancet. 2006;368(9540):1005-11.6.Mathieu P, Bouchareb R, Boulanger MC. 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Evaluation and clinical implications of aortic valve calcification measured by electron-beam computed tomography. Circulation. 2004;110(3):356-62.17.Koos R, Mahnken AH, Kuhl HP, et al. Quantification of aortic valve calcification using multislice spiral computed tomography: comparison with atomic absorption spectroscopy. Invest Radiol. 2006;41(5):485-9.18.Cueff C, Serfaty JM, Cimadevilla C, et al. Measurement of aortic valve calcification using multislice computed tomography: correlation with haemodynamic severity of aortic stenosis and clinical implication for patients with low ejection fraction. Heart. 2011;97(9):721-6.19.Nguyen V, Cimadevilla C, Estellat C, et al. Haemodynamic and anatomic progression of aortic stenosis. Heart. 2015;101(12):943-7.20.Ferda J, Linhartova K, Kreuzberg B. Comparison of the aortic valve calcium content in the bicuspid and tricuspid stenotic aortic valve using non-enhanced 64-detector-row-computed tomography with prospective ECG-triggering. Eur J Radiol. 2008;68(3):471-5.21.Aggarwal SR, Clavel MA, Messika-Zeitoun D, et al. Sex differences in aortic valve calcification measured by multidetector computed tomography in aortic stenosis. Circ Cardiovasc Imaging. 2013;6(1):40-7.22.Capoulade R, Larose ?, Mathieu P, et al. Visceral adiposity and left ventricular mass and function in patients with aortic stenosis: The PROGRESSA study. Can J Cardiol. 2014;30(9):1080-7.23.Capoulade R, Mahmut A, Tastet L, et al. Impact of plasma Lp-PLA2 activity on the progression of aortic stenosis: the PROGRESSA study. J Am Coll Cardiol Img. 2015;8(1):26-33.24.Tastet L, Capoulade R, Clavel MA, et al. Systolic hypertension and progression of aortic valve calcification in patients with aortic stenosis: results from the PROGRESSA study. Eur Heart J Cardiovasc Imaging. 2016.25.Baumgartner H, Hung J, Bermejo J, et al. Echocardiographic assessment of valve stenosis: EAE/ASE recommendations for clinical practice. J Am Soc Echocardiogr. 2009;22(1):1-23.26.Agatston AS, Janowitz WR, Hildner FJ, et al. Quantification of coronary artery calcium using ultrafast computed tomography. J Am Coll Cardiol. 1990;15(4):827-32.27.Briand M, Dumesnil JG, Kadem L, et al. Reduced systemic arterial compliance impacts significantly on left ventricular afterload and function in aortic stenosis: Implications for diagnosis and treatment. J Am Coll Cardiol. 2005;46(2):291-8.28.Pibarot P, Dumesnil JG. Improving assessment of aortic stenosis. J Am Coll Cardiol. 2012;60(3):169-80.29.Roberts WC, Vowels TJ, Filardo G, et al. Natural history of unoperated aortic stenosis during a 50-year period of cardiac valve replacement. Am J Cardiol. 2013;112(4):541-53.30.Cote N, Couture C, Pibarot P, et al. Angiotensin receptor blockers are associated with a lower remodelling score of stenotic aortic valves. Eur J Clin Invest. 2011;41(11):1172-9.31.C?té N, Mahmut A, Fournier D, et al. Angiotensin receptor blockers are associated with reduced fibrosis and interleukin-6 expression in calcific aortic valve disease. Pathobiology. 2014;81(1):15-24.32.Abbas AE, Franey LM, Lester S, et al. The role of jet eccentricity in generating disproportionately elevated transaortic pressure gradients in patients with aortic stenosis. Echocardiography. 2015;32(2):372-82.FIGURE LEGENDSFIGURE 1Correlation between the mean transvalvular gradient (MG) and the aortic valve calcification density (AVCd) in the tricuspid aortic valve subgroup (n=161). Men are represented by blue dots and women are represented by red triangles.FIGURE 2Correlation between the mean transvalvular gradient (MG) and the aortic valve calcification density (AVCd) in the bicuspid aortic valve subgroup (n=39). Men are represented by blue dots and women are represented by red triangles.FIGURE 3Correlation between the mean transvalvular gradient (MG) and the aortic valve calcification density (AVCd) in the tricuspid aortic valve subgroup <72 years old (n=77). Men are represented by blue dots and women are represented by red triangles.FIGURE 4Correlation between the mean transvalvular gradient (MG) and the aortic valve calcification density (AVCd) in the tricuspid aortic valve subgroup ≥72 years old (n=84). Men are represented by blue dots and women are represented by red triangles.FIGURE 5Correlation between the mean transvalvular gradient (MG) and the aortic valve calcification density (AVCd) in the bicuspid aortic valve subgroup <51 years old (n=18). Men are represented by blue dots and women are represented by red triangles.FIGURE 6Correlation between the mean transvalvular gradient (MG) and the aortic valve calcification density (AVCd) in the bicuspid aortic valve subgroup ≥51 years old (n=21). Men are represented by blue dots and women are represented by red triangles.TABLE 1: Characteristics of the study population according to the aortic valve anatomyVariablesTotal (n=200)TAV (n=161)BAV (n=39)P-valueClinical data Age, years67±1371±949±11<0.0001 Men, %7376560.01 Height, cm167±8166±8168±90.28 Weight, kg 79±1680±1676±160.12 Body surface area, m?1.88±0.211.88±0.201.85±0.230.38 Body mass index, kg/m?29±529±527±40.01 Systolic blood pressure, mmHg136±18138±18127±150.0004 Diastolic blood pressure, mmHg75±974±980±80.002 Heart rate, bpm62±962±965±80.03 Hypertension, %808844<0.0001 Dyslipidemia, %718033<0.0001 Diabetes, %232750.003 Coronary artery disease, %38473<0.0001 History of smoking, %67.570.853.80.04Doppler echocardiography data Bicuspid aortic valve, %20-- Left ventricular outflow tract diameter, mm22.0±2.121.7±1.7523.3±2.80.002 Systemic arterial compliance, ml/mmHg/m?0.73±0.230.67±0.170.98±0.29<0.0001 Valvulo-arterial impedance, mmHg/ml/m?3.86±0.723.94±0.713.53±0.700.002 Stroke volume, ml78.3±14.577.4±13.181.7±18.90.10 Stroke volume index, ml/m?41.8±6.941.2±6.244.2±9.00.02 Peak aortic jet velocity, cm/s300±55295±52319±590.01 Mean transvalvular gradient, mmHg21.1±8.720.2±7.924.9±10.60.002 Aortic valve area, cm?1.12±0.281.13±0.271.11±0.300.79 Indexed aortic valve area, cm?/m?0.60±0.130.60±0.130.60±0.140.94 Left ventricular ejection fraction, %65±565±565±40.94MDCT data Aortic valve calcification, AU949 [452-1593]975 [580-1591]672 [22-1604]0.08 Aortic valve calcification density, AU/cm? 256 [132-416]269 [158-435]170 [5-345]0.01TABLE 2: Univariable and multivariable regression analyses of the predictors of mean transvalvular gradientUnivariable analysisMultivariable analysisStandardized βp-valueStandardized βp-value Whole cohort(n=200)Age-0.100.15-0.210.02Men0.100.16-0.060.36Height0.070.36--Weight-0.050.48--Body mass index-0.090.23--Body surface area-0.0090.90--√AVCd0.44<0.00010.59<0.0001BAV0.220.0020.180.04Hypertension-0.010.88--Dyslipidemia-0.010.84--Diabetes-0.140.046-0.080.18History of smoking-0.110.11--Coronary artery disease-0.070.33-- TAV(n=161)Age0.150.054-0.060.36Men0.190.020.010.82Height0.100.23--Weight-0.030.70--Body mass index-0.070.40--Body surface area0.020.84--√AVCd0.63<0.00010.65<0.0001Hypertension0.140.080.020.78Dyslipidemia0.110.15--Diabetes-0.110.17--History of smoking-0.040.61--Coronary artery disease0.020.79-- BAV(n=39)Age-0.130.43-0.490.02Men0.020.90-0.320.10Height-0.070.66--Weight-0.020.92--Body mass index0.010.94--Body surface area-0.030.87--√AVCd0.240.140.670.005Hypertension0.0050.98--Dyslipidemia0.0030.99--Diabetes-0.090.58--History of smoking-0.210.20--Coronary artery disease-0.110.52--(Table 2 continued) TAV < 72 years old (n=77)Men0.130.25-0.040.67Height0.060.60--Weight0.020.85--Body mass index0.030.81--Body surface area0.050.67--√AVCd0.66<0.00010.63<0.0001Hypertension0.250.030.130.16Dyslipidemia0.180.12--Diabetes-0.220.06-0.210.02History of smoking-0.080.52--Coronary artery disease0.080.48-- TAV ≥ 72 years old (n=84)Men0.250.020.080.37Height0.150.17--Weight-0.070.51--Body mass index-0.170.13--Body surface area0.0040.97--√AVCd0.60<0.00010.58<0.0001Hypertension0.030.76--Dyslipidemia0.040.70--Diabetes-0.0050.96--History of smoking-0.0090.94--Coronary artery disease-0.050.65-- BAV < 51 years old (n=18)Men-0.180.48-0.320.36Height-0.280.27--Weight0.050.84--Body mass index0.240.33--Body surface area-0.030.90--√AVCd-0.0050.990.210.55Hypertension-0.050.83--Dyslipidemia-0.090.73--Diabetes----History of smoking-0.350.15--Coronary artery disease-0.140.59-- BAV ≥ 51 years old (n=21)Men0.270.24-0.180.41Height0.170.46--Weight-0.110.64--Body mass index-0.280.22--Body surface area-0.020.93--√AVCd0.670.0010.770.002Hypertension0.080.74--Dyslipidemia0.090.68--Diabetes-0.150.51--History of smoking-0.090.69--Coronary artery disease----Figure 4Figure 5Figure 1Figure 2Figure 3 ................
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