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中华医学超声杂志(电子版) ›› 2024, Vol. 21 ›› Issue (10) : 978 -985. doi: 10.3877/cma.j.issn.1672-6448.2024.10.008

基础研究

左束支传导阻滞性心肌病心脏电-机械重构的实验研究
陈芬1, 葛贝贝1, 王小贤1, 李明霞1, 徐芳1, 史坚2, 郭冠军1, 方爱娟1, 史中青1, 戚占如1, 陈慧1, 姚静1,()   
  1. 1.210008 南京,南京大学医学院附属鼓楼医院超声医学科
    2.210008 南京,南京大学医学院附属鼓楼医院心胸外科
  • 收稿日期:2024-07-19 出版日期:2024-10-01
  • 通信作者: 姚静
  • 基金资助:
    国家自然科学基金面上项目(81771844,82371981)2022年度南京市卫生科技发展专项资金资助项目(SA2053202202)

Electrical-mechanical remodeling in left bundle branch block-induced cardiomyopathy:An experimental study

Fen Chen1, Beibei Ge1, Xiaoxian Wang1, Mingxia Li1, Fang Xu1, Jian Shi2, Guanjun Guo1, Aijuan Fang1, Zhongqing Shi1, Zhanru Qi1, Hui Chen1, Jing Yao1,()   

  1. 1.Department of Ultrasound Medicine,Nanjing Drum Tower Hospital,Affiliated Hospital of Medical School,Nanjing University,Nanjing 210008,China
    2.Department of Thoracic and Cardiovascular Surgery,Nanjing Drum Tower Hospital,Affiliated Hospital of Medical School,Nanjing University,Nanjing 210008,China
  • Received:2024-07-19 Published:2024-10-01
  • Corresponding author: Jing Yao
引用本文:

陈芬, 葛贝贝, 王小贤, 李明霞, 徐芳, 史坚, 郭冠军, 方爱娟, 史中青, 戚占如, 陈慧, 姚静. 左束支传导阻滞性心肌病心脏电-机械重构的实验研究[J]. 中华医学超声杂志(电子版), 2024, 21(10): 978-985.

Fen Chen, Beibei Ge, Xiaoxian Wang, Mingxia Li, Fang Xu, Jian Shi, Guanjun Guo, Aijuan Fang, Zhongqing Shi, Zhanru Qi, Hui Chen, Jing Yao. Electrical-mechanical remodeling in left bundle branch block-induced cardiomyopathy:An experimental study[J]. Chinese Journal of Medical Ultrasound (Electronic Edition), 2024, 21(10): 978-985.

目的

应用心电参数及心脏做功参数评估左束支传导阻滞性心肌病(LBBB-CM)的心脏电-机械重构及其对心脏功能的影响。

方法

选取14只健康比格犬,于麻醉状态下通过射频消融左束支主干构建左束支传导阻滞(LBBB)模型。采集造模前及造模后12个月的心电图、超声心动图并对心电参数及心肌结构和功能参数进行分析。随机选取7只LBBB犬及7只同龄正常对照犬进行心脏解剖及病理学分析,采用Masson染色法分析心内膜胶原含量。依据造模后12个月时LBBB犬的左心室射血分数(LVEF),将14只LBBB犬分为LVEF保留组(LVEF≥50%)9只与LVEF下降组(LVEF<50%)5只,分析两组间电-机械重构差异及心电参数、心肌做功参数与心功能参数的相关性。

结果

相较于基础状态,LBBB犬在造模后12个月左心室舒张末期及收缩末期容积显著增大(P均<0.01),LVEF显著降低[基础状态(62.05±3.26)% vs 造模后12个月(49.72±5.93)%,P<0.001]。左心室心肌应变及做功参数分析显示,LBBB犬造模后12个月左心室整体纵向应变值(GLS)及整体心肌做功效率(GWE)较基础状态显著降低(P均<0.05);整体有用功(GCW)和整体无用功(GWW)显著升高(P均<0.001)。心内膜胶原含量定量分析显示,与对照犬相比,LBBB犬左心室各个节段心内膜胶原纤维体积分数(CVF)显著升高(P均<0.05)。分组分析结果中,LVEF下降组的心电图QRS波总面积显著大于LVEF保留组[LVEF保留组(665.02±147.44) mV·ms vs LVEF下降组(979.05±331.17)mV·ms,P<0.05]。与LVEF保留组相比,LVEF下降组左心室收缩末期容积(LVESV)更大(P<0.05);前间隔及室间隔的节段做功指数(SMW)及室间隔的节段心肌做功效率(SWE)更低[前间隔SMW:LVEF保留组(1363.22±495.37)mmHg% vs LVEF下降组(557.20±572.07)mmHg%,P=0.02;室间隔SMW:LVEF保留组(920.78±473.25)mmHg% vs LVEF下降组(334.60±324.47)mmHg%,P=0.03;室间隔SWE:LVEF保留组(83.11±10.33)% vs LVEF下降组(61.20±22.68)%,P=0.03],室间隔的节段无用功(SWW)更高[LVEF保留组(325.22±200.96)% vs LVEF下降组(763.60±411.08) mmHg%,P=0.02]。相关性分析提示,QRS波总面积与LVEF呈负相关(r=-0.67,P<0.01);室间隔中段SWW与LVEF呈负相关(r=-0.78,P<0.01),室间隔中段SWE与LVEF呈正相关(r=0.64,P=0.01)。

结论

LBBB非良性心律失常,所引起心脏电-机械重构与心功能下降有关,且该过程伴随着严重的心内膜纤维化,导致心肌病的发生、发展。室间隔功能障碍可能是LBBB致心功能障碍的始动因素。

Objective

To comprehensively evaluate electrical-mechanical remodeling in left bundle branch block-induced cardiomyopathy (LBBB-CM) and deeply investigate its impact on cardiac function using electrocardiographic parameters and left ventricular myocardial work parameters.

Methods

In 14 Beagle dogs,LBBB was induced by radiofrequency ablation under anesthesia. Electrocardiograms and echocardiograms were collected and analyzed before and 12 months after model creation. Seven LBBB dogs and seven healthy adult dogs were randomly selected for cardiac dissection and pathological analysis, and Masson staining was used to analyze the endocardial collagen content. According to their left ventricular injection fraction (LVEF) of LBBB dogs at 12 months after model creation, the experimental dogs were divided into an LVEF-preserved group (LVEF≥50%)and an LVEF-decreased group (LVEF<50%) to investigate the difference in electrical-mechanical remodeling between the two groups as well as the correlations between electrocardiographic parameters, myocardial work parameters, and cardiac function parameters.

Results

Compared with the baseline values, the left ventricular end-diastolic and end-systolic volumes of the experimental dogs significantly increased (P<0.01 for all), while the left ventricular ejection fraction (LVEF) significantly decreased [baseline (62.05±3.26)% vs 12 months after model creation (49.72±5.93)%, P<0.001] at 12 months. The left ventricular global longitudinal strain (GLS)and global myocardial work efficiency (GWE) significantly decreased (P<0.05), and the global constructive work (GCW) and global wasted work (GWW) significantly increased (P<0.001) in LBBB dogs at 12 months compared with the baseline values. Quantitative analysis of endocardial collagen content revealed that the collagen volume fraction (CVF) of the endocardium in each segment of the left ventricle in LBBB dogs was significantly increased compared with that of control dogs (P<0.05). Further analysis revealed that the total QRS area in the LVEF-decreased group was significantly larger than that of the LVEF-preserved group [LVEF-preserved group (665.02±147.44) mV·ms vs LVEF-decreased group (979.05±331.17) mV·ms, P<0.05]. Compared with the LVEF-preserved group, the left ventricular end-systolic volume (LVESV) significantly increased(P<0.05), while the segmental myocardial work index (SMW) of the anteroseptal and ventricular septum and the segmental myocardial work efficiency (SWE) of the ventricular septum significantly decreased in the LVEF-decreased group [SMW-anteroseptal: LVEF-preserved group (1363.22±495.37) mmHg% vs LVEF-decreased group (557.20±572.07) mmHg%, P=0.02; SMW-septal: LVEF-preserved group (920.78±473.25) mmHg% vs LVEF-decreased group (334.60±324.47) mmHg%, P=0.03; SWE-septal, LVEF-preserved group (83.11±10.33)%vs LVEF-decreased group (61.20±22.68)%, P=0.03]. Significant differences were observed in the segmental wasted work (SWW) of the ventricular septum between the two groups (LVEF-preserved group (325.22±200.96)mmHg% vs LVEF-decreased group (763.60±411.08) mmHg%, P=0.02). Correlation analysis indicated that the total QRS area was negatively correlated with LVEF (r=-0.67, P<0.01). For the segmental myocardial work parameters of septum in the middle segment, SWW was strongly negatively correlated with LVEF (r=-0.78,P<0.01), while SWE was moderately positively correlated with LVEF (r=0.64, P=0.01).

Conclusion

LBBB is not a benign arrhythmia, leading to the occurrence and development of cardiomyopathy. The electrical-mechanical remodeling of the heart induced by LBBB is related to the cardiac dysfunction, accompanied by severe endocardial fibrosis. Septal injury may trigger cardiac dysfunction in LBBB.

图1 常规12导联心电图采用时间-振幅积分法测量QRS波面积示意图(QRS波总面积=QRS波面积+QRS波面积+…+QRS波面积V6
表1 LBBB犬造模前后QRS波参数比较(,n=14)
表2 LBBB犬基础状态及造模后12个月左心室心肌结构及功能参数比较(,n=14)
表3 正常对照犬与LBBB犬左心室各壁中间段及心尖部胶原体积分数比较(%,
图2 正常对照犬与左束支传导阻滞(LBBB)犬左心室心内膜纤维化病理图。图a为正常对照犬病理图,图b为LBBB犬病理图(Masson染色×200)
表4 不同LBBB组心电参数比较(
表5 不同LBBB组常规超声参数比较(ml,
表6 不同LBBB组心肌应变及做功参数比较(
LBBB组别 数量(只) 左心室纵向应变值(%)
整体参数 前壁 前间隔 室间隔 后壁 下壁 侧壁
LVEF保留组 9 -13.39±3.55 -15.70±6.22 -16.09±6.40 -14.95±7.99 -13.74±7.50 -14.32±4.10 -12.20±4.20
LVEF下降组 5 -11.76±4.96 -11.58±11.88 -12.90±5.04 -8.46±5.53 -11.73±7.19 -7.19±5.98 -15.12±6.55
t 0.76 0.86 0.95 0.14 0.49 2.66 1.03
P 0.46 0.40 0.36 1.60 0.64 0.02 0.33
LBBB组别 数量(只) 心肌做功指数(mmHg%)
整体参数 前壁 前间隔 室间隔 后壁 下壁 侧壁
LVEF保留组 9 1023.56±299.26 1353.44±558.03 1363.22±495.37 920.78±473.25 959.89±572.20 1105.78±645.04 969.00±361.42
LVEF下降组 5 896.00±324.07 1327.20±492.27 557.20±572.07 334.60±324.47 969.00±549.59 998.40±196.20 1102.20±824.83
t 0.88 0.09 2.77 2.45 0.03 0.36 0.43
P 0.40 0.93 0.02 0.03 0.98 0.73 0.68
LBBB组别 数量(只) 做功效率(%)
整体参数 前壁 前间隔 室间隔 后壁 下壁 侧壁
LVEF保留组 9 81.33±3.00 87.78±13.73 83.44±8.88 83.11±10.33 89.11±8.30 87.22±10.60 79.11±7.37
LVEF下降组 5 79.60±26.32 85.60±11.52 79.60±10.74 61.20±22.68 85.00±12.08 82.60±10.16 87.80±7.46
t 0.85 0.30 0.72 2.52 0.76 0.79 2.10
P 0.41 0.77 0.48 0.03 0.46 0.44 0.06
LBBB组别 数量(只) 有用功(mmHg%)
整体参数 前壁 前间隔 室间隔 后壁 下壁 侧壁
LVEF保留组 9 1953.11±281.42 2160.11±828.57 2639.00±719.94 1912.00±817.10 1629.33±555.57 1845.67±592.36 1555.89±614.46
LVEF下降组 5 1884.80±576.55 2132.00±567.16 2013.00±854.24 1282.00±530.80 1755.80±682.66 1764.00±303.67 1554.80±737.42
t 0.48 0.07 1.46 1.54 0.38 0.28 0.00
P 0.64 0.94 0.17 0.15 0.71 0.78 1.00
LBBB组别 数量(只) 无用功(mmHg%)
整体参数 前壁 前间隔 室间隔 后壁 下壁 侧壁
LVEF保留组 9 414.56±95.96 233.89±216.46 469.00±233.82 325.22±200.96 176.11±115.17 238.33±185.42 362.78±92.09
LVEF下降组 5 456.20±145.04 308.00±225.90 553.00±449.38 763.60±411.08 281.00±236.03 354.20±195.21 160.40±70.60
t 0.72 0.60 0.47 2.72 1.14 1.10 4.24
P 0.49 0.56 0.65 0.02 0.28 0.29 0.001
图3 左束支传导阻滞性心肌病犬心电及心肌做功参数与心功能参数的相关性分析散点图。图a为QRS波总面积与左心室射血分数的相关性分析散点图;图b为室间隔节段无用功与左心室射血分数的相关性分析散点图;图c为室间隔节段做功效率与左心室射血分数的相关性分析散点图
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