胸部肿瘤放射治疗时对心脏的损伤曾有报道，但对受损的程度了解甚少。为了更全面地了解胸部肿瘤放射对患者心脏的影响，我们对56例无心脏病史的胸部肿瘤患者进行24h动态心电图（DCG）观察，现报道如下。1材料和方法1．1观察对象患者均为经病理确诊的胸部恶性肿瘤需放疗者。疗前 Injuries to the heart during chest radiotherapy have been reported, but little is known about the extent of the damage. In order to have a more complete understanding of the impact of chest tumor radiation on the heart of patients, we performed 24-hour Holter monitoring (DCG) on 56 patients with no history of heart disease and are reported as follows. 1 Materials and Methods 1.1 The object of observation were pathologically confirmed chest cancer need radiotherapy. Before treatment