摘要
目的应用速度向量成像(VVI)结合心肌声学造影(MCE)评价犬冠状动脉狭窄静息和负荷状态下心肌组织灌注和舒张功能的关系。方法制作不同程度冠状动脉(前降支)狭窄模型8只,在冠状动脉狭窄前后于静息和多巴酚丁胺注射达峰值剂量时,取左心室短轴图像行VVI分析,并行MCE测量心肌血流量(A.β值)和短轴圆周方向上的舒张期峰值应变率(SRdia),评价二者之间的相关性。结果静息状态下,冠状动脉轻、中度狭窄时,供血区SRdia和A.β值与正常区差异无统计学意义;重度狭窄时,供血区SRdia和A.β值均低于正常区(P<0.05)。多巴酚丁胺负荷下,轻、中度冠状动脉狭窄时,供血区SRdia和A.β值即低于正常区(P<0.05);重度狭窄时,缺血区SRdia和A.β值较正常区降低得更加明显(P<0.05)。无论静息还是负荷状态下,SRdia和A.β间均呈正相关(r静息=0.57,r负荷=0.72,P<0.01)。结论VVI技术能够用于评价短轴心肌节段舒张功能,且能在一定程度上反映心肌血流灌注的变化情况。
Objective To evaluate the relationship between myocardial perfusion and diastolic function with velocity vector imaging （VVI） combined with myocardial contrast echocardiography （MCE） in dog models of coronary artery stenosis at rest and stress. Methods Different stenoses in anterior descending branch were made in 8 dogs. Before and after coronary artery stenosis, VVI evaluation was made on short axis image, then MCE were performed in the left ventricular mastoid muscle section at rest and in the peak dose of dobutamine. The myocardial blood flow A ·β value and peak diastolic strain rate （SRdia） on the direction of the circumference of the short view were measured, and the relationship between them was analyzed. Results At rest, no significant difference of A · β value nor SRdia, was found between the stenotic bed and normal bed when coronary stenosis was mild or moderate. However, A · β value and SRdia of the stenotic bed were smaller than those in the normal bed when coronary stenosis was severe （P〈0.05）. At dobutamine stress, A· β value and SRdia of the stenotic bed were already less than those in the normal bed when coronary stenosis was mild or moderate. A· β values and SRdia of the stenotic bed decreased further compared to the normal bed （P〈0. 05） when coronary artery was severe. At both rest and stress, the standard A· β value was strongly correlated with SRdia （rrest=0.57, rstress= 0.72, P〈0.01）. Conclusion VVI can not only evaluate the diastolic function of myocardial segments on the short axis view, but also reflect changes of myocardial perfusion to a certain extent.
出处
《中国医学影像技术》
CSCD
北大核心
2009年第10期1733-1737,共5页
Chinese Journal of Medical Imaging Technology
基金
国家"863"科技计划项目(2006AA02Z478)
关键词
速度向量成像
心肌声学造影
应变率
组织多普勒成像
应变率成像
Velocity vector imaging
Myocardial contrast echocardiography
Strain rate
Tissue Doppler imaging
Strain rate imaging
