All of them received three chamber biventricular pacing and the left ventricular pacing lead was inserted into a cardiac vein through coronary sinus.

Observational studies suggest that conventional right ventricular apical pacing may have a deleterious effect on left ventricular function.

Conclusion Measuring the motion velocities of mitral annulars by QTVI can be used to assess global left ventricular systolic and diastolic function in Dual-chamber Pacing .