title: The role of fQRS in coronary artery disease. A meta-analysis of observational studies.
abstract: BACKGROUND
  Experimental and clinical studies have suggested that the presence of fragmented QRS complex (fQRS) is associated with various cardiovascular diseases. fQRS may predict major adverse cardiovascular events (MACE). The current meta-analysis was performed using clinical outcome studies to evaluate the role of fQRS in coronary artery disease (CAD).
  
  
  METHODS
  A systematic search of electronic databases (Cochrane, Medline, Embase and Pubmed) from their inception to April 2014 was performed. Data were extracted from applicable articles to evaluate the prognostic value of fQRS in CAD.
  
  
  RESULTS
  A total of 16 observational studies about fQRS and CAD (n = 3,997 patients) were identified. Compared with the non-fQRS group, MACE and mortality were significantly higher in the fQRS group -odds ratios (OR) 3.19, 95 % confidence interval (95 % CI) [2.3, 4.42], p < 0.00001; OR 2.24, 95 % CI [1.71, 2.94], p < 0.0001. Patients developed Q waves, anterior-wall myocardial infarction (MI), and low left ventricular ejection fraction (LVEF) more frequently in the fQRS group than in the non-fQRS group-OR 2.59, 95 % CI [1.76, 3.81], p < 0.00001; OR 2.43, 95 % CI [1.07, 5.52], p = 0.03; OR - 6.43, 95 % CI [- 9.11, - 3.74], p < 0.00001.
  
  
  CONCLUSIONS
  Based on current evidence, fQRS was associated with increased MACE, mortality, Q waves, anterior-wall MI, and decreased LVEF in CAD. These findings show that fQRS is a reliable marker in CAD.
authors.affiliation: Department of Cardiology, Institute of Cardiovascular disease, Second Affiliated Hospital of Nanchang University, 1 Minde Road, 330006, Nan Chang, Jiang Xi, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.forename: Z
authors.initials: Z
authors.lastname: Qiu
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.forename: H
authors.initials: H
authors.lastname: Bao
authors.forename: S
authors.initials: S
authors.lastname: Gao
authors.forename: X
authors.initials: X
authors.lastname: Cheng
mesh_terms: D000368:Aged; D002561:Cerebrovascular Disorders / Q000175:diagnosis / Q000401:mortality*; D003324:Coronary Artery Disease / Q000175:diagnosis* / Q000401:mortality*; D003936:Diagnosis, Computer-Assisted / Q000379:methods / Q000706:statistics & numerical data; D004562:Electrocardiography / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D006333:Heart Failure / Q000175:diagnosis / Q000401:mortality*; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis / Q000401:mortality*; D064887:Observational Studies as Topic / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D018570:Risk Assessment / Q000379:methods; D012680:Sensitivity and Specificity; D015996:Survival Rate