摘要
目的 探讨应用冠脉血流多普勒显像技术(CDCFI) 在检测犬心肌内血流方面的价值,观察声学造影剂和冠脉扩张对心肌内血流的多普勒增强效应。方法 应用CDCFI检测5 条开胸杂种犬心脏各节段心肌内血流信号;经主动脉根部注入Albunex 及短暂结扎并放开前降支后观察心肌内血流信号的改变;处死犬后沿超声所见较明显冠脉血流切面解剖以证实超声所见。结果 5 条犬各段心肌内均可显示散在彩色血流信号,多普勒频谱显示这些血流以舒张期灌注为主,并为前向血流,收缩期可见少量逆流。在这些节段中前壁、前间壁以及前侧壁血流最易显示,这些信号由前降支垂直发出,与前降支血流呈“T”字形分布;另外,4 条犬的前壁内可以显示1 ~2 条长条形而另1 条犬的前壁内可见许多条形血流信号,这些血流信号由心外膜冠脉垂直发出后,经心肌直接进入乳头肌。4 条犬的室间隔动脉血流信号由左冠脉主干发出,而另1 条犬由左前降支起始段发出,然后沿前室间隔和中室间隔朝向右室面行程,并终止于室间隔右室面。这一点超声所见与解剖检查结果一致。进行声学造影后心肌内即刻充满丰富彩色信号,较基础状态时明显增多且较明亮。短暂闭塞前降支冠脉并松开后,心肌内血流信号亦见明显增多。结论 CDC?
Objective The study was performed to probe into the value of color Doppler coronary flow imaging system (CDCFI) in the examination of canine intramyocardial flow the in the assessment of flow Doppler enhancement after infusion of contrast agents and during coronary dilation. Methods Baseline intramyocardial flow in different segments of myocardium in 5 open chest mongrel dogs was examined by CDCFI and by pulse wave Doppler.Then Albunex was injected through the aortic root and intramyocardial flow was observed sequently.Left descending artery was occluded for 20 seconds and then relaxed to determined the change of intramyocardial flow in anterioseptal and anterior wall of left ventricle.At the end of the experiment,Dogs were killed and the hearts were incised to prove the findings by CDCFI. Results In every segment of myocardium color flow signals could be found.The flow pattern was predominantly diastolic with systolic reversal.Flow signals could be displayed most easily in anterior and anterioseptal wall.The intramyocardial coronary flow originated from the related epicardial coronary and went into the myocardium vertically.So the epicardial and intramyocardial flow distributed “T” like.1 to 2 long line flow signals in 4 dogs and many in 1 dog were found entering the myocardium and reach directly papillary muscle.In septum a long line signal went from the origin to the right ventricular endocardium.This finding corresponded to the anatomic examination.The signals increased after the infusion of Albunex and in the condition of hyperemia. Conclusion CDCFI could detect intramyocardial flow accurately and could provide direct hemodynamic information. [
出处
《中国医学影像技术》
CSCD
北大核心
2000年第1期1-4,共4页
Chinese Journal of Medical Imaging Technology
关键词
声学造影剂
冠脉扩张
CDCFI
实验
Color Doppler conronary flow imaging
Contrast agent
Coronary dilation