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32P液体球囊血管内照射预防血管介入治疗后再狭窄的实验研究 |
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霍勇 王日胜 陈明 刘兆平 朱国英
【摘要】 目的 观察血管内液体球囊放射治疗对血管介入治疗后再狭窄的影响, 为其临床应用提供实验依据;同时通过放射治疗效应来探讨放射治疗防止再狭窄发生的可能机制。方法 兔髂动脉经球囊过度扩张损伤后,一侧经32P液体球囊血管内照射作治疗,另一侧未经治疗作对照。用计算机图像分析方法观察血管组织形态学的变化;免疫组化方法测定增殖细胞核抗原(PCNA)阳性细胞以了解血管内膜增殖过程。结果 兔髂动脉经球囊过度扩张损伤后,血管内膜可明显增生,PCNA染色为强阳性;经32P液体球囊照射后的对侧损伤髂动脉,内膜增生明显受抑,PCNA染色为弱阳性,外弹力板围绕面积均增加,管腔面积无明显变化。 结论 32P液体球囊确可防止再狭窄的形成,其机制可能是通过抑制平滑肌细胞增殖和改善血管重塑形成。 【关键词】 近距离放射疗法 再狭窄
Experimental study of endovascular brachytherapy using liquid 32P-filled balloon catheter
Huo Yong, Wang Risheng, Chen Ming, et al. The First Hospital of Beijing Medical University, Beijing 100034
【Abstract】 Objective To evaluate the effect of endovascular brachytherapy on restenosis after interveneional therapy and investigate the possible mechanism of restenosis prevention after endovascular brachytherapy. Methods In balloon-injuried rabbit model, pathological sections of iliac artery were observed to estimate the changes of vascular histomorphology by computer analysis of photomicrogram and the proliferation of vascular smooth muscle cells was evaluated by means of immunohistochemistry to quantify the proliferation of cellular nuclear antigen(PCNA).Results After rabbit iliac arteries were injuried by balloon overstretch angioplasty, PCNA staining showed less proliferative in the irradiation side than in the control side. In the irradiation side, the fromation of neointima was suppressed, with EEL area increased but without lumen area change.Conclusion Endovascular brachytherapy using liquid 32 P-filled balloon catheter system could prevent restenosis, its mechanism might be the inhibition on the proliferation of neointima and improvement on vascular remodeling. 【Key words】 brachytherapy restenosis
介入治疗后血管再狭窄严重影响介入治疗的远期疗效,大量动物实验及临床试验均证实血管内放射治疗可防止再狭窄[1~4]。本研究应用简便易行的放射性液体球囊血管内照射,观察其有效性和可能的机制。
材料与方法
1.球囊过度扩张模型的建立:选用日本大耳白兔6只,体重平均3kg,雌、雄各3只,经右侧颈动脉行髂动脉造影,然后以长20毫米,直径3毫米的灌注球囊维持压[1] [2] 下一页 上一个医学论文: 冠状动脉内置入自制钽丝支架的实验研究 下一个医学论文: 小剂量多巴酚丁胺及其合用硝酸酯超声心动图试验识别冬眠心肌的对比研究
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