U波是心电图诸波中最小的波,常不被人重视,但U波倒置可能是心电图诸波形中最重要的波形之一,其形态及向量方向的改变,常是某些严重心脏病或低血钾症等有力佐证。现将我院1例急性广泛前壁心肌梗塞极早期出现U波倒置报告如下: 男,60岁。因心慌、胸闷、胸痛半月来我院就诊,心电图U波倒置,深而宽,双肢对称,似冠状T样,尤以V_3导联明显,QRS、ST段均正常,以冠心病心绞痛住院治疗,但胸闷、胸痛仍频繁发作。住院第八天突然出现胸骨后压榨性闷痛,含化硝酸甘油不能缓解,心电图示急性广泛前壁 U wave is the smallest wave in ECG, which is often not taken seriously. However, U wave inversion may be one of the most important waveforms in ECG and its change of shape and vector direction is often caused by some serious heart disease or Hypokalemia and other evidence. Now in our hospital a case of acute extensive anterior myocardial infarction early U wave inversion report as follows: male, 60 years old. Due to palpitation, chest tightness, chest pain for half a month to our hospital, ECG U wave inversion, deep and wide, symmetrical limbs, like coronary T-like, especially V_3 lead was significantly, QRS, ST segment were normal to hospitalized with angina pectoris , But chest tightness, chest pain is still frequent attacks. On the eighth day after hospitalization, there appeared sudden tenderness of the chest after pressing, nitroglycerin-containing nitroglycerin could not be alleviated, and ECG showed acute extensive anterior wall