Evaluation of ventricular arrhythmia by velocity vector imaging

Release date: 2007-12-11

Velocity vector imaging to evaluate ventricular arrhythmia VVI technology can directly reflect the abnormal pacemaker site and local myocardial motion characteristics of ventricular arrhythmia, providing a new non-invasive diagnosis of ventricular arrhythmia, monitoring treatment and evaluation of prognosis method. Arrhythmia refers to any abnormality in the origin of the heart rhythm, heart rate and rhythm, and impulse conduction.
The Chinese Journal of Ultrasound Imaging published a study in the fourth issue of April. The researchers performed VVI on high-frame grayscale two-dimensional images of 17 patients with ventricular arrhythmia collected by ultrasound, and showed the velocity of local myocardial tissue in a vector manner. Size and direction. The vector motion of myocardial tissue in each segment was observed to determine the origin of the ectopic pacemaker. The myocardial velocity (VN) at the ectopic pacing and the myocardial velocity (VN) at the sinus rhythm were measured. The time delay (Tv-MXE) between the earliest and the latest myocardial in the ventricle at the time of pacing and the time delay (Tv-MXN) between the earliest and the latest myocardium in the sinus rhythm. To explore the application value of velocity vector imaging (VVI) technique in evaluating the ectopic pacemaker of ventricular arrhythmia and the coordination of local myocardial motion. Fang Lingyun and other researchers from the Department of Ultrasound Diagnosis, Union Hospital of Tongji Medical College, Huazhong University of Science and Technology, showed that the myocardial tissue velocity vector motion coordination was consistent in patients with normal sinus rhythm, and the length was basically the same. The local myocardial tissue velocity vector contracted prematurely during ectopic pacing. Local myocardial motion was significantly uncoordinated earlier than other chamber walls. The myocardial velocity of VE in the abnormal origin was significantly higher than that in normal sinus rhythm. The difference between Tv-MXE and Tv-MXN was statistically significant (P<0.05). Therefore, it can be seen that VVI technology can directly reflect the abnormal pacemaker site and its local myocardial motion characteristics during ventricular arrhythmia, and provide a new method for clinical non-invasive diagnosis of ventricular arrhythmia, monitoring treatment and evaluation of prognosis. ——Midi Medical Network

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