Predictor and Risk Factor Evaluation of Left Ventricular Free Wall Reverse Remodeling in Patients With Obstructive Hypertrophic Cardiomyopathy After Modified Morrow Procedure by Three-layer Speckle Tracking of Echocardiography
10.3969/j.issn.1000-3614.2016.01.013
- VernacularTitle:超声心动图分层应变技术评价肥厚型梗阻性心肌病改良扩大Morrow术后左心室游离壁逆重构及预测影响因素
- Author:
Jingjin WANG
;
Minghu XIAO
;
Xin SUN
;
Minghui ZHANG
;
Jinping ZHANG
;
Haibo CHEN
;
Changsheng ZHU
;
Shuiyun WANG
;
Hao WANG
- Publication Type:Journal Article
- Keywords:
Cardiomyopathy,hypertrophic;
Cardiac surgical procedure;
Ventricular dysfunction,left;
Ultrasonography
- From:
Chinese Circulation Journal
2016;31(1):60-64
- CountryChina
- Language:Chinese
-
Abstract:
Objectives: To evaluate the predictor and risk factor of left ventricular (LV) free wall reverse remodeling in patients with obstructive hypertrophic cardiomyopathy (HCM) after modiifed Morrow procedure by three-layer speckle tracking of echocardiography.
Methods: Our investigation included 2 groups: HCM group, n=60 patients who had successful modified Morrow procedure in our hospital from 2014-06 to 2014-12, there were 41 (68.3%) male with the average age of (39.1 ± 15.2) years. Control group, n=40 healthy subjects. Three-layer speckle tracking echocardiography was conducted to analyze pre-and post-operative LV free wall three-layer myocardium (endocardial, mid, and epicardial layers) changes at longitudinal strain (LS) and circumferential strain (CS). Clinical and echocardiography information were collected at pre-and (6-24) months post-operation. The impact factors for LV free wall reverse remodeling was identiifed by liner regression analysis and the segment’s thickness≥15mm was deifned as the hypertrophic LV free segment.
Results: In HCM group, compared with pre-operative condition, the post-operative thickness of LV free wall including anterior, anterolateral and inferolateral were reduced;while both post-operative LS and CS elevated (-13.8 ± 4.8)%vs (-17.0 ± 5.2)%and (-23.7 ± 3.8)%vs (-25.4 ± 3.7)%, P<0.05. LV mass index by echocardiography was larger than LV mass index by surgical resection (13.5 ± 30.9) g/m2 vs (3.4 ± 2.0) g/m2, P<0.05. Liner regression analysis indicated that the number of pre-operative hypertrophic segments (r=-0.680, P<0.001) and age (r=0.638, P<0.001) were the independent impact factors for post-operative LS;△left ventricular outlfow tract (LVOT) gradient (r=0.386, P=0.005) was the independent impact factor for post-operative CS.
Conclusion:①After modiifed Morrow procedure, LVOT obstruction disappeared which leaded LV free wall reverse remodeling in HCM patients, ②three-layer myocardium of LV free wall all had reverse remodeling, ③better improved LVOT gradient were with less number of hypertrophic segments;the elder patients usually had the better post-operative reverse remodeling.
