多普勒组织成像技术对右心起搏器电除极状态的研究

目的 应用ＤＴＩ技术分析评价安置右心起搏器患者的异常电除极状态。方法：研究人群５８例，分为三组，Ａ组为２０例近期安装ＶＶＩ型或ＤＤＤ型右心起搏器的患者；Ｂ组为１８例心电图证实为完全性左束支传导阻滞的患者，Ｃ组则为正常心电图的健康人群２０例。结果：１．ＤＴＡ图显示：①除极起源：Ａ组的心室除极源于右室心尖部，与Ｃ组有显著差异；②除极顺序：胸骨旁心腔心切面Ａ组加速度变化顺序为右室前壁心尖－右室前壁中部、

Doppler Tissue Imaging in Evaluation of Ventricular Depolarization in Patients with Right Ventricular Pacing

Objective: To demonstrate the ventricaular depolarization in patients with right ventricular pacing using Dopper tis- sue imaging. Methods: The studied population consisted of three groups: 20 patients in group A were right ventricular pace - maker; 18 patientsion group B were patients with complete left bundle branch block; in group C were 20 healthy volunteers. Results: The origin of abnormal depolarization in group A was located in the apex of right ventricular, The origin of ventricular depolarization in group C was located in IVS area, there was significant difference between group C and A (B); In parasternal left ventricular long axis view, the contraction of left ventricular posterior wall in group A and B were significantly slower than that in group C. Furthermore, the contraction of left ventricular posterior wall in group A was earlier than that in group B. The the intervals from the onset of Q wave on ECG to the beginning. the end of systolic band of left ventricular posterior wall in group A were shorter than that in group . Conclu- sion: DTI can be used to assess the abnormal ventricular depolarization in parients with pace - maker. It seems that the depolarization of left ventricular in right ventricular pace - maker is earlier than that in the patients with complete left bundle branch bloch.