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实验性慢性心肌梗死中心肌应变的决定因素

Determinants of Myocardial Strain in Experimental Chronic Myocardial Infarction.

作者信息

Ballo Haitham, Tarkia Miikka, Haavisto Matti, Stark Christoffer, Strandberg Marjatta, Vähäsilta Tommi, Saunavaara Virva, Tolvanen Tuula, Teräs Mika, Hynninen Ville-Veikko, Savunen Timo, Roivainen Anne, Knuuti Juhani, Saraste Antti

机构信息

Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland; Heart Center, Turku University Hospital and University of Turku, Turku, Finland.

Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.

出版信息

Ultrasound Med Biol. 2019 Feb;45(2):568-578. doi: 10.1016/j.ultrasmedbio.2018.10.005. Epub 2018 Nov 19.

Abstract

We evaluated the relationships between regional myocardial strain measured by speckle tracking echocardiography and viability, fibrosis, hypertrophy and oxygen consumption in the infarcted or remote myocardium in a pig model of chronic myocardial infarction (MI). Thirteen farm pigs with surgical occlusion of the left anterior descending coronary artery and five sham-operated pigs were studied 3 mo post-MI. Computed tomography revealed significant left ventricle remodeling. Reduced radial or circumferential strain identified areas of transmural infarction (area under the curve: 0.82 and 0.79, respectively). In the remote non-infarcted area, radial strain correlated inversely with the amount of fibrosis (r = -0.66, p = 0.04) and myocyte hypertrophy (r = -0.68, p = 0.03). Radial strain rate inversely correlated with myocardial resting oxygen consumption assessed with C-labeled acetate positron emission tomography (r = -0.71, p = 0.006). In conclusion, myocardial strain and strain rate reflect fibrosis, hypertrophy and oxygen consumption of the remote areas after MI.

摘要

我们评估了在慢性心肌梗死(MI)猪模型中,通过斑点追踪超声心动图测量的局部心肌应变与梗死或远隔心肌的存活能力、纤维化、肥大及氧消耗之间的关系。对13只接受左前降支冠状动脉手术闭塞的农场猪和5只假手术猪在心肌梗死后3个月进行了研究。计算机断层扫描显示左心室有明显重塑。径向或圆周应变降低可识别透壁梗死区域(曲线下面积分别为0.82和0.79)。在远隔非梗死区域,径向应变与纤维化程度呈负相关(r = -0.66,p = 0.04),与心肌细胞肥大呈负相关(r = -0.68,p = 0.03)。径向应变率与用碳标记乙酸正电子发射断层扫描评估的心肌静息氧消耗呈负相关(r = -0.71,p = 0.006)。总之,心肌应变和应变率反映了心肌梗死后远隔区域的纤维化、肥大及氧消耗情况。

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