title: Plasma leukocyte elastase concentration in angiographically diagnosed coronary artery disease.
abstract: OBJECTIVE
  To evaluate the clinical usefulness of leukocyte elastase determination in the diagnosis of coronary artery disease (CAD).
  
  
  BACKGROUND
  Recent research has shown the important role of elastase, a proteolytic enzyme released by neutrophils, in the pathogenesis of CAD.
  
  
  METHODS
  141 patients underwent coronary angiography during investigation of chest pain and/or heart valve disease. Ninety-six had coronary lesions and 45 non-stenotic coronaries. The patients were characterized as regards presence or absence of angina (stable or unstable), family history of CAD, smoking, diabetes mellitus, hypertension, leukocyte counts, and plasma lipid and elastase concentrations. Among CAD-group patients, those with simple atheromatous plaques were distinguished from those with complex plaques.
  
  
  RESULTS
  Elastase concentrations were greater in the CAD group than in the non-CAD group (49.7 +/- 2.8 micrograms.l-1; as against 29.5 +/- 2.2 micrograms.l-1; P < 0.001), and greater among complex-plaque CAD patients than among simple-plaque CAD patients (65.2 +/- 5.3 micrograms.l-1 as against 38.6 +/- 1.9 micrograms.l-1; P < 0.001). Logistic regression analysis showed (a) that the risk of CAD varied with elastase concentration, angina status, age and sex, increasing by 11% for every 1 microgram.l-1 increase in elastase concentration; and (b) that among CAD patients the risk of complex plaques was greatest for those with unstable angina and high elastase concentration, increasing by 6% for every 1 microgram.l-1 increase in elastase concentration.
  
  
  CONCLUSIONS
  Peripheral blood leukocyte elastase concentration is a sensitive diagnostic marker of CAD. High values suggest the presence of complex atheromatous plaques.
authors.affiliation: Cardiology Department, Hospital General y Clínico de Galicia, School of Medicine, Santiago de Compostela, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Amaro
authors.forename: F
authors.initials: F
authors.lastname: Gude
authors.forename: R
authors.initials: R
authors.lastname: González-Juanatey
authors.forename: C
authors.initials: C
authors.lastname: Iglesias
authors.forename: F
authors.initials: F
authors.lastname: Fernández-Vázquez
authors.forename: J
authors.initials: J
authors.lastname: García-Acuña
authors.forename: M
authors.initials: M
authors.lastname: Gil
mesh_terms: D004796:Clinical Enzyme Tests; D017023:Coronary Angiography; D003327:Coronary Disease / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007958:Leukocyte Count; D019272:Leukocyte Elastase; D008055:Lipids / Q000097:blood; D008297:Male; D008875:Middle Aged; D010196:Pancreatic Elastase / Q000097:blood*
chemical_list: D008055:Lipids; D010196:Pancreatic Elastase; D019272:Leukocyte Elastase