机构地区:[1]中国医学科学院北京协和医学院 心血管病研究所 阜外心血管病医院核医学科,100037 [2]北京师范大学化学学院
出 处:《中华心血管病杂志》2007年第10期949-955,共7页Chinese Journal of Cardiology
摘 要:目的 [二(二甲氧丙基膦基乙基)-乙氧乙胺]-[二(氧-乙氧乙基)二硫代氨基]锝氮配合物[^(99m)Tc(N)(PNP5)(DBODC)]^+是新近开发出的一种心肌灌注显像剂,前期研究显示,其具有显著的肝清除速度。本研究观察其在犬急性心肌缺血模型中的显像特点,并与^(99m)Tc-MIBI 进行比较。方法 12只实验用纯种比格犬随机分为两组。组1,手术阻断左冠状动脉前降支血流,制成冠状动脉狭窄>90%后,静脉滴注腺苷,0.14 mg·kg^(-1)·min^(-1),共6 min,3 min 末时注射[^(99m)Tc(N)(PNP5)(DBODC)]^+185 MBq。腺苷滴注完毕后,解除血管阻断,恢复心肌供血。分别于注射显像剂后0.5、1、1.5、2 h 进行心肌灌注单光子发射计算机断层(SPECT)显像,24 h 后行静息心肌 SPECT 显像。组2,除注射的显像剂为^(99m)Tc-MIBI 外,其余实验方案同组1。结果 [^(99m)Tc(N)(PNP5)(DBODC)]^+的心肌摄取高,滞留时间长,其心肌摄取与^(99m)Tc-MIBI 相当。两者的肺摄取均很低,0.5 h 时[^(99m)Tc(N)(PNP5)(DBODC)]^+和^(99m)Tc-MIBI 的心/肺比值分别为3.55±0.68和2.92±0.32,且2 h 内无显著变化。但[^(99m)Tc(N)(PNP5)(DBODC)]^+的肝清除速度显著快于^(99m)Tc-MIBI,注射后1 h,[^(99m)Tc(N)(PNP5)(DBODC)]^+的心/肝比值已显著高于^(99m)Tc-MIBI(1.36±0.43比0.58±0.21,P=0.005)。[^(99m)Tc(N)(PNP5)(DBODC)]^+能清晰显示心肌缺血,其检测心肌缺血的效能不差于^(99m)Tc-MIBI,[^(99m)Tc(N)(PNP5)(DBODC)]^+显示缺损节段(3.60±1.52)个,^(99m)Tc-MIBI 显示缺损节段(4.25±0.96)个,P=0.48。[^(99m)Tc(N)(PNP5)(DBODC)]^+具有和^(99m)Tc-MIBI 相似的轻度"再分布"特性。由于肝清除迅速,早期显像(注射后30 min)时,[^(99m)Tc(N)(PNP5)(DBODC)]^+的图像质量优于^(99m)Tc-MIBI。结论 [^(99m)Tc(N)(PNP5)(DBODC)]^+作为一种新型心肌灌注显像剂,其心肌摄取、肺摄取、检测心肌缺血的效能以及"再分布"特性等均与^(99m)Tc-MIBI 相似,同时其肝清除速度显著快于^(99m)Tc-MIBI,这不仅有利于实现早期显像,�Objective ^99mTc-[ bin (dimethoxypropylphosphinoethyl) -ethoxyethylamine ( PNP5 ) ] - [ bin(N-ethoxyethyl) -dithiocarbamato ( DBODC ) ] nitride ( [ ^99m Tc ( N ) ( PNP5 ) ( DBODC ) ]^+ ) is a new myocardial perfusion tracer with high heart uptake and rapid liver clearance. The objectives of this study were to compare the myocardial imaging of [ 99mTc (N) ( PNP5 ) (DBODC) ]^+ with 99mTc-MIBI in a canine model of acute myocardial ischemia. Methods The left anterior descending artery (LAD) was occluded in 12 adult beagle dogs, adenosine was then infused intravenously at a rate of 0. 14 mg·kg^-1· min^ -1 for 6 min. At the end of 3 rain of adenosine infusion, 185 MBq of [ 99, Tc (N) ( PNP5 ) (DBODC) ]^+ or ^99mTc- MIBI was injected intravenously. The occluder was released after 6 min adenosine infusion. Serial myocardial SPECT imaging acquisitions were obtained at 0. 5, 1, 1.5 and 2 h after tracer injection, respectively. Rest myocardial SPECT imaging was acquired in the next day. Results Similar as ^99mTc- MIBI, [^99m^Tc( N ) ( PNP5 ) ( DBODC ) ]^+ exhibited high heart uptake, minimal lung uptake and minimal redistribution. No significant myocardial washout was observed with both tracers over a period of 2 hours. [ ^99mTc (N) (PNP5) (DBODC) ]^+ clearance from the liver was more rapid than that with ^99mTc-MIBI (heartliver radio at 60 min, 1.36 ±0.43 vs. 0. 58 ±0.21, P =0. 005 ). [^99mTc(N) ( PNP5 ) (DBODC) ]^+ the ability to detect myocardial ischemia was also comparable between the two tracers ( [ ^99mTc ( N ) ( PNP5 ) (DBODC) ]^+ detected 3. 60 ± 1.52 defect segments, ^99Tc-MIBI detected 4. 25 ± 0. 96 defect segments, P =0. 48). The image quality of [^99mTc(N)(PNPS) (DBODC)]^+ was better than ^99mTc-MIBI. Conclusion [ ^99mTc(N) (PNP5)(DBODC) ]^+ is comparable to ^99mTc-MIBI on detecting myocardial ischemia in this model and liver clearance is more rapi
分 类 号:R541[医药卫生—心血管疾病]
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