[Changes in Macruz index of patients with coronary artery diseases and their clinical implications].

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.

Conclusion: The Macruz index is more helpful than E/A ratio to some extent in estimating the left ventricular diastolic function of CAD patients.