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A novel method for quantitative myocardial contrast echocardiography in mice

机译:小鼠中数定量心肌造影超声心动图的一种新方法

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The small size of the mouse heart frequently imparts technical challenges when applying conventional in vivo imaging methods for assessing heart function. Here, we describe the use of high-frequency ultrasound imaging in conjunction with a size-tuned blood pool contrast agent for quantitatively assessing myocardial perfusion in living mice. A perflurocarbon micro-bubble formulation exhibiting a narrow size distribution was developed, and echogenicity was assessed at 18 MHz in vitro. Adult mice were subjected to permanent ligation of the left anterior descending artery. Ultrasound imaging was performed on day 7, and a cohort of intact mice was used as a control. Parasternal long-axis cine clips were acquired at 18 MHz before and after contrast administration. Reduced ejection fraction and increased end-systolic volume were observed in infarcted compared with control mice. In control animals, washin of the contrast agent was visible in all myocardial segments. Reduced contrast enhancement was observed in apical-posterolateral regions of all infarcted mice. A novel method for reslicing of the imaging data through the time domain provided a two-dimensional presentation of regional contrast agent washin, enabling convenient identification of locations exhibiting altered perfusion. Myocardial segments exhibiting diminished contractility were observed to have correspondingly low relative myocardial perfusion. The contrast agent formulation and methods demonstrated here provide the basis for simplifying routine in vivo estimation of infarct size in mice and may be particularly useful in longitudinal evaluation of revascularization interventions and assessment of peri-infarct ischemia.
机译:小鼠心脏的小尺寸经常在应用常规成像方法时促进技术挑战,以评估心脏功能。在这里,我们描述了使用高频超声成像结合尺寸调谐的血吸性造影剂,用于定量评估生物小鼠中的心肌灌注。开发出窄尺寸分布的穿孔微泡配方,在体外评估18MHz的回声。对成年小鼠进行左前期下降动脉的永久性连接。超声成像在第7天进行,使用完整小鼠的群组作为对照。在对比度管理之前和之后,在18 MHz获得胸长轴的长轴剪辑。与对照小鼠相比,在梗死的梗死中观察到降低的喷射部分和增加的末端收缩量。在对照动物中,在所有心肌段中可见造影剂的洗涤蛋白。在所有梗死小鼠的顶端 - 后侧区域观察到降低对比度增强。一种新的方法,用于通过时域重新分配成像数据的新方法提供了区域造影剂洗涤蛋白的二维呈递,使得能够方便地识别表现出改变灌注的位置。观察到具有减少的收缩性的心肌段相对相对的心肌灌注。这里证明的造影剂制剂和方法提供了简化小鼠梗死尺寸的常规的常规的基础,并且在血运重建干预的纵向评估中可能特别有用,并且对梗塞缺血的评估。

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