Tissue Velocity Imaging Assessment Of The Intraventricular Dyssynchrony And Correlation To The QRS Width In Chronic Heart Failure Patients

Chronic heart failure (CHF) was a kind of common syndrome. Its clinical symptoms are caused by left ventricule enlargement, heart function deterioration and cardiac output decrease. Clinical symptoms of Some patients were aggravated because of the following delay of atrioventricular conduction and intraventricular conduction,The prognosis of the patients with heart function of NYHAШ~IV class is very poor. At present, cardiac resynchronization therapy (CRT) in CHF patients is a kind of new therapy, which can improve haemodynamics, clinical symptoms, quality of life, and exercise tolerance in patients with severe congestive heart failure (CHF). However, some clinical studies observed that approximately 20%~30% patients don't benefit from CRT and some patients even deteriorated in clinical symptom. So it has dispute that it was decided the indication of CRT by the QRS duration of CHF. Some studies showed that there was a weak relation between the duration of QRS and the mechanical dissynchrony of LV, QRS duration may not adequately reflect left ventricular dyssynchrony. Tissue velocity imaging (TVI) is a new echocardiographic technique aiming to noninvasively assess the...