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60年代以后,对心房的传导组织有了进一步的认识。认为心房有三组传导组织,即前结间束、中结间束及后结间束。前结间束又分出左房的分枝,称为Bachmann氏束。进而对P波的形成、P波异常时的临床意义有了进一步的研究。 P向量除了初始右房和终末左房部分外,尚有第三部分,见于1/3案例,仅在一个投影面上出现,该部分往往大于单一的右房或左房部分,投影在心电图上,相当于平均向量,即晚期右房、房间隔和早期左房激动的向量在同一方向上叠加的结果。心率正常时,在某些心电图上,P波顶端前后出现一个小切迹,心率加快时,左、右房激动时间差值缩
After the 1960s, the atrial conduction organization has been further recognized. That the atria have three groups of conductive tissue, that is, before the end of the bundle, the bundle between the junction and the bundle after the end. Before the end of the bundle and then split the left atrium branch, called the Bachmann’s bundle. Further research on the clinical significance of P wave formation and P wave abnormalities has been carried out. P vector addition to the initial right atrium and terminal left atrial part, there is a third part, seen in 1/3 of cases, only one projection surface appears, the part is often larger than a single right atrium or left atrial part of the projection in the electrocardiogram , Equivalent to the average vector, that is, the late right atrial, atrial septal and early left atrial excite vector superposition in the same direction results. Normal heart rate, in some ECG, P wave front and back of a small notch, heart rate, left and right atrial activation time difference shrinkage