伴有ＱＲＳ形态改变的电阶梯现象傅路红，祝伦语，贾连旺例１：男性５７岁。反复胸闷气短六年加重二十余天入院。约二十年前发现有风湿性瓣膜病，准备换瓣手术三个月前做冠脉造影示右冠近端重度狭窄和左前降支中度狭窄。彩色超声心动图示二尖瓣，主动脉瓣回声强增粗，中度... Ladder phenomenon with QRS morphological changes Fu Luhong, Zhu Lun, Jia Lianwang Example 1: Male 57 years old. Repeated chest tightness and shortness of breath more than 20 days admitted to hospital for six years. Rheumatic valvular disease was found about 20 years ago, and coronary angiography was performed three months prior to valve replacement surgery to show a proximal stenosis of the right crown and a moderate stenosis of the left anterior descending artery. Color echocardiography shows the mitral valve, aortic valve echo thick, moderate ...