Objective:To observe the effect of He-Ne laser intravascular irradiation on blood(ILIB)on QT dispersion(QTd)in patients with coronary heart disease(CHD).

• 目的：了解低能量氦氖激光血管内照射（ILIB）对冠心病患者心电图QT离散度（QTd）的影响，并评价其临床价值。