Left ventricular contractile functie of 60 casesfor each group is evaluated with Heather index(HI) of cardiac impedance plethysmogr-aphy in coronary heart disease, suspected coronary heart disease and normal.

• 应用心阻抗微分图的Heather指数(H1),评定冠心病、可疑冠心病及健康人(每组各60例)的左心室收缩功能。