心肌超声造影心动图对高强度聚焦超声左心室心肌消融心肌坏死范围的评价
Biomedical Engineering and Clinical Medicine(2013)
Abstract
目的探讨心肌超声造影心动图评价高强度聚焦超声(HIFU)左心室心肌消融心肌坏死范围的可行性。方法新西兰兔9只,兔龄8~12个月,体质量(3.0±0.2)kg(2.8~3.5 kg)。HIFU治疗频率1.5 MHz,强度9.64 kW/cm2,脉冲照射方式,Ton=0.2 s、0.3 s,Toff=1.0 s、1.5 s,重复次数20次,靶区范围3 mm×2 mm。照射后行左心室心肌超声造影心动图,然后取下心脏,做2mm心肌切片,用2,3,5-三苯基氯化四氮唑(TTC)染色。测量造影剂充盈缺损面积及与之相对应心肌切片TTC染色心肌坏死面积,并计算其占整个心肌的面积百分比。结果造影剂充盈缺损面积百分比(13.7%±6.7%)与TTC染色心肌坏死面积百分比(15.5%±4.9%)间差异无统计学意义(P>0.05);两者间呈显著相关(r=0.94,P<0.05)。结论心肌超声造影心动图可用于评价HIFU左心室心肌消融心肌坏死范围。
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Key words
ablation,myocardial contrast echocardiography,high intensity focused ultrasound
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