论文部分内容阅读
左前半阻滞左前半阻滞常与左室疾患有关,故心电图基本波形常被同时并存因素如左室肥厚、心肌梗死、心肌纤维化或心脏位置改变所影响。典型左前半阻滞的心电图特征为:QRS平均心电轴介于-45°～-60°间,Ⅰ、avL导联有Q波,呈Q_1S_3型,QRS时间不超过0.10秒,R_1 S_2及S_3电压较大。左前半阻滞伴肺气肿为一诊断难题,肺气肿本身可产生电轴左偏,由于心尖旋后在肢导联呈S_1S_2S_3型及低电压,而左前半阻滞倾向于在ⅡⅢ导联有深S波,因此,若在ⅡⅢ有深S波而无S_1时,则加强对左前半阻滞的诊断。直背综合征或胸廓畸形也可呈
The left half of the block before the left half block and often associated with left ventricular disease, the basic ECG waveform is often coexisting factors such as left ventricular hypertrophy, myocardial infarction, myocardial fibrosis or changes in cardiac position. Typical left anterior chamber block ECG characteristics: QRS average ECG axis between -45 ° ~ -60 °, Ⅰ, avL lead with Q wave Q_1S_3 type, QRS time does not exceed 0.10 seconds, R_1S_2 and S_3 The voltage is bigger. Left anterior block with emphysema is a diagnostic problem, pulmonary emphysema itself can produce left-axis deviation, because apical convulsion in the limb leads was S_1S_2S_3-type and low voltage, while the left anterior half block tend to lead in the Ⅱ Ⅲ There is a deep S wave, so if there is a deep S wave in IIIII without S_1, then the diagnosis of the left anterior half block is strengthened. Straight-back syndrome or thoracic deformity can also be presented