title: Association between plasma asymmetrical dimethylarginine activity and severity of aortic valve stenosis.
abstract: OBJECTIVE
  Aortic valve stenosis is the most common valvular heart disease in the Western world. The most common cause of aortic valve stenosis in adults is calcification of a normal trileaflet or congenital bicuspid valve. Calcific aortic valve stenosis is an active disease process characterized by mechanical stress, endothelial damage, lipid accumulation, inflammation, synthesis of extracellular matrix proteins, and calcification, reminiscent of atherosclerosis in many aspects. Asymmetrical dimethylarginine (ADMA) is an endogenous inhibitor of nitric oxide synthase which reduces the bioavailability of nitric oxide and begets endothelial dysfunction. The goal of this study was to examine the association between ADMA activity and severity of aortic valve stenosis.
  
  
  METHODS
  One hundred and nine patients were included in this study. Patients were grouped as those with mild aortic stenosis (42 patients, group 1), moderate aortic stenosis (36 patients, group 2), and severe aortic stenosis (31 patients, group 3). ADMA activity was measured by ELISA kit.
  
  
  RESULTS
  Mean ADMA activity in group 3 was significantly higher than that in groups 1 and 2 (1.94 ± 0.45 vs. 0.87 ± 0.37 micromol/l, P < 0.001 and 1.94 ± 0.45 vs. 1.34 ± 0.52 micromol/l, P < 0.001, respectively). Serum ADMA activity was positively correlated with mean aortic gradient and maximum aortic gradient and negatively correlated with aortic valve area.
  
  
  CONCLUSIONS
  Our results showed that serum ADMA activity is higher in patients with severe aortic valve stenosis. ADMA activity is positively correlated with aortic valve stenosis severity. Serum ADMA level may be used as a precious marker to evaluate and follow up the severity of aortic valve stenosis.
authors.affiliation: Cardiology Clinic, Dışkapı Yıldırım Beyazıt Research and Educational Hospital, Ministry of Health, Turkey. goksel1977@yahoo.com
authors.forename: Goksel
authors.initials: G
authors.lastname: Cagirci
authors.forename: Serkan
authors.initials: S
authors.lastname: Cay
authors.forename: Aytun
authors.initials: A
authors.lastname: Canga
authors.forename: Ozlem
authors.initials: O
authors.lastname: Karakurt
authors.forename: Nuray
authors.initials: N
authors.lastname: Yazihan
authors.forename: Harun
authors.initials: H
authors.lastname: Kilic
authors.forename: Serkan
authors.initials: S
authors.lastname: Topaloğlu
authors.forename: Dursun
authors.initials: D
authors.lastname: Aras
authors.forename: Ahmet D
authors.initials: AD
authors.lastname: Demir
authors.forename: Ramazan
authors.initials: R
authors.lastname: Akdemir
mesh_terms: D000368:Aged; D001024:Aortic Valve Stenosis / Q000097:blood*; D001120:Arginine / Q000031:analogs & derivatives* / Q000097:blood; D015415:Biomarkers / Q000097:blood; D016009:Chi-Square Distribution; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012720:Severity of Illness Index; D014421:Turkey; D015854:Up-Regulation
chemical_list: D015415:Biomarkers; C018524:N,N-dimethylarginine; D001120:Arginine