彩色多普勒组织成像对室性心律紊乱异位起搏点定位的研究

本文应用彩色多普勒组织成像（ＤＴＩ）新技术，与心电图同步，对２６例室性心律紊乱患者的心肌显像作了初步研究，并与患者正常窦性心律的心肌显像作图像回放比较。发现当心电图上出现室性早搏或短阵室性心动过速时，ＤＴＩ可同步显示早搏起源部收缩期高于其他部位心室肌运动的某一黄色亮点区，平均速度可达０．１０～０．２１ｍ／ｓ。而正常窦性心律时此亮点区则消失，运动速度低于０．０５ｍ／ｓ，表现了异位起搏使该处心肌发生提前灌注的特征。此亮点区所在部位与心电图判断的室性异位起源部位相吻合，且更为具体。提示ＤＴＩ直观反映了室性异位心律的确切起源部位及异位搏动前后心肌运动状况，为临床无创诊断异位起搏点及病灶、治疗与监测预后提供了一项新的手段。

Doppler Tissue Image Study on Localization of the Abnormal Exciting Premature Ventricular Arrhythmias

The myocardial images of 26 cases with ventricular arrhythmias carried out by Doppler tissue image(DTI)technic,meanwhile ECG was used for comparing study.The myocardial image obtained from patients with normal sinus rhythm was compared with cine loop.The velocity of the abnormal exciting point in systolic phase detected by DTI was higher than that of other myocardial movement site.The mean velocity reached 0 1-0 21 m/s.The detecting velocity of the brightness point produced by sinus node was lowered to 0 05m/s.It showed that myocardium of the abnormal exciting point had characteristics of myocardial infusion in advance.The brightness point of myocardium in abnormal exciting point at the ventricular wall was detected by DTI as the same as ECG.DTI indicates directly the exciting point of abnormal ventricular arrhythmia and the condition of myocardial movement in pre and post premature ventricular contraction.It is useful for diagnosing and treating abnormal exciting point.