title: Reduced apelin levels in stable angina.
abstract: OBJECTIVE
  To investigate the change in the plasma apelin level in patients with stable angina.
  
  
  METHODS
  The study enrolled 96 patients with stable angina as the Stable Angina Group and another 78 outpatients with no angina as the Control Group.
  
  
  METHODS
  were excluded if they had a history of acute coronary syndrome, rheumatic heart disease, cardiomyopathy, cardiac arrhythmia, diabetes mellitus, hyperthyroidism, or antecedent hypertension. Plasma apelin levels of all subjects were determined using a commercially available immunoassay. In addition, blood was sampled for measurements of 8-iso-prostaglandin-F2alpha by enzyme-linked immunosorbent assay. The severity of coronary artery stenosis of stable angina patients was evaluated using the Gensini score.
  
  
  RESULTS
  The mean levels of apelin in plasma were significantly lower in subjects with stable angina compared with controls (1.24 vs.1.98 ng/mL, p <0.05). The plasma level of apelin in the stable angina group was negatively correlated with the Gensini score (r =-0.399, p <0.05).
  
  
  CONCLUSIONS
  Reduced apelin levels were observed in this homogenous population of stable angina subjects and the plasma apelin level was negatively correlated with the degree of coronary stenosis.
authors.affiliation: Department of Cardiology, The First Affiliated Hospital of China Medical University, Shenyang, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Li
authors.forename: Yinglong
authors.initials: Y
authors.lastname: Bai
authors.forename: Jian
authors.initials: J
authors.lastname: Hu
mesh_terms: D000787:Angina Pectoris / Q000097:blood* / Q000175:diagnosis*; D000073861:Apelin; D015415:Biomarkers / Q000097:blood; D023921:Coronary Stenosis / Q000097:blood / Q000503:physiopathology; D003430:Cross-Sectional Studies; D015536:Down-Regulation / Q000502:physiology; D005260:Female; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000097:blood* / Q000502:physiology; D008297:Male; D008875:Middle Aged
chemical_list: C115436:APLN protein, human; D000073861:Apelin; D015415:Biomarkers; D036341:Intercellular Signaling Peptides and Proteins