【摘要】 <正> 目前急性心肌梗塞(AMI)的早期心电图诊断,主要根据T波和ST-T波改变。据临床与实验室研究表明,室性异位心搏对早期心肌梗塞的诊断亦有一定帮助,有时甚至在窦性激动尚未出现心肌梗塞波形之前,更多还原

【Abstract】 When ectopic ventricular bats (EVB) are complicated with myocardial infarction, the diagnosis of the infarction may be evident from the morphology of the ectopic beats. Sometimes ectopic ventricular beats had revealed the pattern of AMI, even before the appearance of AMI sinus ventricular beats. EVB can reflect the site of infarction more accurately. EVB with infarction manifest as: 1. When an EVB with a dominantly positive QRS complex is preceded by an initial q wave, no matter how small, the diagnosis of myocardial infarction is suggested. The EVB may thus manifest with a QR (case 1 and 4-8), QrS (case 10) or qR (case 2,7,9) pattern. 2. The diagnosis of myocardial infarction is suggested when S-T segment and/or T wave of EVB manifest with primary changes, including (1) Elevation of the S-T segment, (2) Coving of the S-T segment or slope elevation of the S-T segment (case 1, 4,7-9), and (3) Symmetry and sharpening of the T wave (case 2,3). When the diagnosis of AMI is made, (a) The ectopic ventricular beat must have a dominantly positive QRS deflection. (b) The analysis must be made from the leads which are orientaded to the external-epicardialsurface of the heart. Finally, the diagnosis must be made in combination with clinical data.更多还原