Objective      To study the relationship between the QRS wave duration of idiopathic dilated cardiomyopathy (DCM) patients and the synchronicity of left ventricular mechanical contraction using real-time three-dimensional echocardiography (RT-3DE).       Methods      Fro

m September

2012 to June

2013

63 patients with DCM in our hospital were divided into 3 groups according to QRS wave duration: A1 group [QRS 120 ms (n=36)

22 males and 14 females

average age 52.17±13.30

]

A2 group [120 ms≤QRS150 ms (n= 17)

12 males and 5 females

average age 58.71±9.43

]

and A3 group [QRS≥150 ms (n= 10)

9 males and 1 female

average age 54.10±10.57

]

. As left ventricular arriving at segments 6

12

and 16

the standard deviation and the maximum difference of minimum systolic volume time were acquired with the application of RT-3DE

and standardized value was also obtained. Assuming Tmsv16-SD% as systolic dyssynchrony index (SDI)

5.12% was used as a cutoff point value to judge whether left ventricular systolic was synchronized. SDI5.12% was deemed ventricular mechanical systolic synchrony

while SDI5.12% was deemed ventricular mechanical systolic dyssynchrony.       Results      The SDI values of A1

A2

A3 group were 6.26±4.08

8.53±4.12

and 10.82±6.24

respectively. There was significant difference between group A1 and group A3 (

P

0.05). Among groups A1 and A2 as well as groups A2 and A3

with the broadening of QRS wave duration

SDI tended to increase gradually (

P

0.05). In groups A1

A2 and A3

there was no correlation (

P

0.05) of SDI with QRS wave duration

LVEDV

LVEF

as well as LVESV.       Conclusion      The ventricular systolic dyssynchrony detection rate among DCM patients with wide QRS wave is higher than those with narrow QRS wave. There is no correlation between QRS wave duration and left ventricular systolic synchronicity.