Evaluation Of Left Ventricular Movement In Patients With Type B Wolff-Parkinson-White Syndrome

OBJECTIVE:To investigate the left ventricular(LV)torsion parameters and left ventricular myocardial longitudinal strain parameters of type B Wolff-Parkinson-White syndrome(B-WPW)and to explore alternation of the left ventricular motion pattern in patients with B-WPW.METHODS:Thirty-eight patients with B-WPW were studied.And 40 volunteers were selected as control.Two-dimensional speckle tracking imaging(2D-STI)was used to acquire left ventricular torsion parameters and left ventricular myocardial longitudinal strain parameters.Biplane Simpson method was used to measure LV end-diastolic volume(LVEDV),end-systolic volume(LVESV)and ejection fraction(LVEF).All above parameters were measured in patients with B-WPW before(B-WPW-B group)and after(B-WPW-A group)radiofrequency catheter ablation and in control group.The QRS width of lead II was recorded.RESULTS:In patients with B-WPW,the peak value of LV apex rotation(RotA),LV base rotation(RotB)and LV twist(TwistLv)were lower,LV base was more obvious than LV apex.The time to RotB(TTPb)was shorter,RDA-B was longer.The peak value of left ventricular myocardial global longitudinal strain was lower.The peak value of longitudinal strain in serevel Left ventricular wall were decreased,including middle segment of posterior wall,apex segment,middle segment and basal segment of inferior wall,middle segment and basal segment of interventricular septum.The left ventricular enlarged and the QRS prolonged.After radiofrequency catheter ablation,the left ventricular torsion parameters in patients with B-WPW recovered significantly,and the peak value of left ventricular myocardial longitudinal strain parameters were still poor,both of which were lower than those in the control group.CONCLUSIONS:The left ventricular motion pattern of patients with B-WPW alters,including the changes of peak value and time to peak value in LV apex rotation,LV base rotation and LV twist,as well as LV myocardium dyssynchrony.The changes of peak value in Left ventricular global longitudinal strain and serevel Left ventricular wall longitudinal strain.The motion pattern of LV in patients with B-WPW was improved in acute stage after radiofrequency catheter ablation but not yet recover totally.