title: [Changes in Macruz index of patients with coronary artery diseases and their clinical implications].
abstract: OBJECTIVE
  To study the association of Macruz index with left ventricular diastolic function of patients with coronary artery disease (CAD).
  
  
  METHODS
  The ratio of P/P-R segment (Macruz index) was measured using regular 12-lead electrocardiography in 90 CAD patients, whose mitral E/A wave ratios were determined by means of Doppler echocardiography. The measurements were also performed in 85 patients with non-coronary artery diseases for comparison.
  
  
  RESULTS
  The mitral E/A ratio of the CAD patients with 1 or 3 branches involved was lower than 1, while in patients with two branches involved, the E/A ratio exceeded 1. The P/P-R segment ratio of the 3 CAD groups was all over 1.6.
  
  
  CONCLUSIONS
  The Macruz index is more helpful than E/A ratio to some extent in estimating the left ventricular diastolic function of CAD patients.
authors.affiliation: Department of Cardiology, People's Hospital of Deqing Country, Deqing 313200, China.
authors.forename: Xing-feng
authors.initials: XF
authors.lastname: Xia
authors.forename: Feng-ru
authors.initials: FR
authors.lastname: Zhang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003324:Coronary Artery Disease / Q000503:physiopathology*; D003971:Diastole; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016277:Ventricular Function, Left