正交试验优选冬凌草甲素脂质体制备工艺

目的优选冬凌草甲素脂质体的较优制备工艺。方法以胆固醇、大豆磷脂为载体,采用乙醇注入法制备冬凌草甲素脂质体。采用包封率作为为评价指标,以正交实验设计选出制备脂质体的最佳处方。结果通过正交设计优选出冬凌草甲素脂质体的制备工艺条件为:冬凌草甲素∶卵磷脂为1∶20,胆固醇与卵磷脂质量比为5∶1,超声时间为20 min,温度为50℃。结论该制备工艺得到的脂质体包封率较高,形态较好,方法可行。     

促黄体激素释放激素a(LHRHa)靶向鸦胆子油脂质体的制备及质量评价

目的 制备促黄体激素释放激素a(LHRHa)靶向鸦胆子油脂质体并评价其质量.方法 采用薄膜分散法结合生物素-链霉亲和素桥接法制备LHRHa靶向鸦胆子油脂质体,正交设计优选处方,透射电镜下观察脂质体形态,采用Zetasizer Nano ZS分析仪测定脂质体粒径、Zeta电位,葡聚糖凝胶柱层析结合分光光度法测定包封率,通过离心加速实验及渗漏率考察脂质体稳定性,体外细胞实验鉴定脂质体靶向性.结果 所得优化处方为磷脂与胆固醇比4∶1,药物与脂质比3∶10,DSPE-PEG-Biotin与卵磷脂质量比为3％,超声乳化时间为8min.按此处方制备的脂质体形态圆整,粒径为155.1±14.5nm,Zeta电位为-24.1±0.54mV,平均包封率达92.2％,对卵巢癌A2780/DDP细胞的亲和力约为普通脂质体的2.7倍.结论 LHRHa靶向鸦胆子油脂质体制备工艺可行,同时具有包封率高、稳定性及靶向性良好等优点.     

马尼地平脂质体的制备及其质量研究

目的优选马尼地平脂质体的处方和制备工艺,并对其进行质量研究。方法采用乙醇注入法制备马尼地平脂质体,并对其形态学、粒径、包封率、初步稳定性等性质进行了研究。结果在透射电子显微镜下观察,制备的马尼地平脂质体为均匀的球状或近球状,平均粒径为233．9nm,包封率为89．6％,脂质体4℃放置稳定。结论选择乙醇注入法优化工艺制备马尼地平脂质体稳定可行,为进一步开发马尼地平新制剂提供了实验依据。     

交错融合脂质体的制备

目的研究交错融合脂质体（IFVs）的制备。方法采用改良方法制备交错融合脂质体（IFVs）,应用激光散射粒度分析仪（PCS）对其粒径大小及分布情况进行测定,利用高压液相色谱仪测定其包封率。结果 IFVs脂质体粒径为100 nm左右。包封率为（69.0±5.4）%,远高于其他类型脂质体,并且性质稳定。结论 IFVs是一种大单层脂质体,其特点是粒径均匀（100 nm）,包封容积大,可达20~25μl/μmol脂质,可以携带足够量药物。     

紫杉醇长循环肝靶向脂质体的制备

目的:制备紫杉醇长循环肝靶向脂质体(pac-GLs),并对制备的脂质体的性质进行评价.方法:用薄膜水化-高压均质法制备紫杉醇长循环肝靶向脂质体,纳米粒度测定仪测定其粒径,高效液相法测定其包封率.结果:制备的紫杉醇长循环肝靶向脂质体中的药物浓度为(1.00±0.10)mg/ml,包封率为(94±3)%.结论:本研究制备的紫杉醇长循环肝靶向脂质体包封率较高,质量可控,重复性好.     

葡萄糖修饰的载胰岛素脂质体以包封率为指标的制备工艺研究

目的基于乙醇对脂质双分子层膜的去稳定作用制备得较高包封率的载胰岛素脂质体。方法本研究以空白大单室脂质体在乙醇存在的条件下对胰岛素进行主动载药。考察了脂质处方、乙醇浓度、孵育温度、孵育时间、PEG2000-succ-Chol用量、药脂比等对包封率的影响。结果乙醇存在条件下空白大单室脂质体对胰岛素进行主动载药而得粒径（180±70）nm的小多室脂质体,包封率为28%～32%。结论该方法制备所得的胰岛素脂质体比文献报道的包封率提高了近2倍,而且避免了使用有机溶剂,最大程度保护了胰岛素的生物活性。     

脂质体纳泡超声造影剂的制备及体外超声显像效果观察

目的制备一种包裹C3F8的新型纳米级脂质体超声造影剂,考察其基本特性并评价充气后体外超声显影效果。方法采用乙醇注入法制备脂质体粒子,在显微镜及透射电镜下观察其形态,分布,并检测其粒径及Zeta电位。冷冻干燥制成冻干粉,充入C3F8,制得脂质体纳泡,在凝胶模型中检测增强超声效果。结果脂质体溶液呈乳白色悬液,在显微镜及透射电镜下,形态规则,分散均匀,平均粒径为(679.70±146.70)nm,Zeta电位(-0.05±11.10)m V;冻干粉重悬分散性好,无聚集;体外超声显示,脂质体溶液均不能增强超声基波及谐波模式图像;脂质体纳泡在低机械指数下,超声图像增强轻度增强,在较高机械指数下,基波及谐波模式图像均明显增强,且持续稳定显像。结论采用乙醇注入-冷冻干燥法成功制备出粒径小、可持续显像的新型脂质体纳泡超声造影剂,为超声造影剂小型化的制备及应用发展提供新的研究方向。     

鬼臼毒素固体脂质纳米粒的制备及对人表皮细胞体外增殖的影响

目的研究鬼臼毒素固体脂质纳米粒(POD-SLN)对人表皮细胞增殖的影响。方法采用超声乳化法制备POD-SLN混悬液,采用扫描电镜观察其粒径大小和形态,粒径分析仪测定其粒径和电位,高效液相法测定其包封率,并观察其稳定性。用POD-SLN作用于体外培养的人表皮细胞,并于6、12、24、48h检测细胞的生长情况。实验设POD-SLN组、鬼臼毒素普通脂质体组、鬼臼毒素(POD)组、空白固体脂质纳米粒(SLN)组、空白对照组,MTT法测定各组对人表皮细胞增殖的抑制作用。结果制备的POD-SLN呈圆球形或椭圆形,稳定性好,粒径为87.2±10.3nm,电位25.3±0.8mV,包封率为83.2%±2.5%。POD-SLN对人表皮细胞增殖的抑制作用呈浓度和时间依赖性。POD-SLN、POD普通脂质体及POD作用48h对人表皮细胞的抑制率最高分别为91.05%、77.02h.46%,IC50分别为2.11、16.65、101.42μg/L。空白SLN对人表皮细胞增殖无影响。结论该制备工艺可行,所制备的POD-SLN在体外能有效抑制人表皮细胞增殖,且作用强于POD及普通POD脂质体。     

甲状旁腺病灶重量对99Tcm-MIBI显像诊断灵敏度的影响

目的 探讨甲状旁腺病灶重量对99Tcm-甲氧基异丁基异腈（MIBI）双时相平面显像及其 SPECT/CT早期断层融合显像诊断灵敏度的影响。 方法 收集2017年2月至2018年10月在昆山市第一人民医院经手术病理学确诊的甲状旁腺功能亢进患者22例,其中男性9例、女性13例,年龄28~73（50.77±8.79）岁。所有患者均于术前行99Tcm -MIBI双时相平面显像、99Tcm-MIBI SPECT/CT早期断层融合显像,以术后病理学结果为“金标准”。按切除的病灶重量将全部病灶分为两组,A组:病灶重量≤1.00 g,B组:病灶重量>1.00 g。采用χ2检验分析两种显像方法对不同重量组的诊断效能。 结果 22例患者中,共切除病灶58个。99Tcm-MIBI双时相平面显像对A、B两组的诊断灵敏度分别为47.83%（11/23）和84.00%（21/25）,差异有统计学意义（χ2=7.05,P=0.008）;99Tcm-MIBI SPECT/CT早期断层融合显像对A、B两组的诊断灵敏度分别为78.26%（18/23）和85.19%（23/27）,差异无统计学意义（χ2=0.40,P=0.525）。99Tcm-MIBI SPECT/CT早期断层融合显像对A组的诊断灵敏度高于99Tcm-MIBI双时相平面显像,差异有统计学意义（χ2=4.57,P=0.033）。99Tcm-MIBI SPECT/CT早期断层融合显像对B组的诊断灵敏度高于99Tcm-MIBI双时相平面显像,但差异无统计学意义（χ2=0.01,P=0.906）。 结论 甲状旁腺病灶重量对99Tcm-MIBI双时相平面显像诊断灵敏度有影响,当病灶重量较小时,99Tcm-MIBI双时相平面显像对其的诊断灵敏度较低;而病灶重量对99Tcm-MIBI SPECT/CT早期断层融合显像的诊断灵敏度无明显影响。     

蕨麻素冻干脂质体的制备及理化性质的研究

目的 制备蕨麻素冻干脂质体注射剂并研究其理化性质。方法 采用薄膜超声分散法并冷冻干燥来制备蕨麻素脂质体,用葡聚糖凝胶（Sephadex G-50）微型柱离心法测定包封率。结果 制得的蕨麻素脂质体包封率为56．62％,粒径范围为71．70—166．47nm,透射显微镜下观察脂质体为粒径均匀的球类或近球状小囊泡。结论 蕨麻素脂质体处方和制备工艺稳定可行,重现性好。     

盐酸表阿霉素-紫杉醇复方脂质体的制备

目的进行盐酸表阿霉素-紫杉醇复方脂质体的制备工艺研究并建立同时测定两药含量的高效液相色谱方法。方法采用薄膜分散-pH梯度法制备复方脂质体。Venusil MP C18色谱柱（250cm×4.6mm,5μm）;流动相：乙腈-甲醇-10mmol/L磷酸盐缓冲液（pH2.5）（36∶32∶32）;检测波长：227nm;流速：1.0ml/min。结果盐酸表阿霉素与紫杉醇出峰时间分别为4.2、14.8min;线性方程分别为Y=216300X-34525（r=0.9998,0.1~25μg/ml）,Y=161480X-84107（r=0.9998,0.3~75μg/ml）。盐酸表阿霉素和紫杉醇的回收率均在99%~101%范围内,日内和日间RSD均〈2%。制备的复方脂质体平均粒径162nm,盐酸表阿霉素与紫杉醇的含量分别为0.27、0.83mg/ml;包封率分别为98.6%、95.5%。结论本研究制备的复方脂质体粒径较小,包封率较高,建立的高效液相色谱法可以同时测定盐酸表阿霉素和紫杉醇的含量。     

99Tcm-MIBI SPECT/CT融合断层显像在甲状旁腺功能亢进症中的应用价值

目的评价99Tcm-MIBI SPECT/CT双时相融合断层显像在原发性甲状旁腺功能亢进症（PHPT）与继发性甲状旁腺功能亢进症（SHPT）中的应用价值。方法回顾性分析97例（PHPT 28例,SHPT 69例）HPT患者的99Tcm-MIBI SPECT/CT显像图像特征、症状、血清甲状旁腺激素（PTH）、血钙、磷及碱性磷酸酶（AKP）等结果。分析比较PHPT和SHPT两组患者的显像特点、手术病理、实验室检查以及诊断的灵敏度、特异度与临床指标之间的相关性。结果（1）99Tcm-MIBI SPECT/CT显像对PHPT的术前诊断灵敏度为96.55%,特异度为98.78%;对SHPT的术前诊断灵敏度为68.77%,特异度为79.17%。（2）PHPT多表现为单发病灶,而SHPT多表现为多个亢进的甲状旁腺病灶,病灶平均直径较小（Z=-2.591,P=0.010）,且容易合并钙化（χ2=9.588,P < 0.01）,差异均有统计学意义。（3）PHPT中无特殊不适主诉的患者比例明显高于SHPT中的比例（χ2=11.713,P < 0.001）,PHPT出现结石的比例高于SHPT（χ2=6.075,P < 0.001）,SHPT出现骨痛的比例高于PHPT（χ2=24.382,P < 0.01）,差异均有统计学意义;SHPT患者血清PTH和AKP水平均明显高于PHPT,差异有统计学意义（Z=-6.663、-4.326,均P < 0.001）,PHPT具有高钙低磷的特点,SHPT患者血钙正常或轻度升高,血磷明显升高。结论99Tcm-MIBI SPECT/CT双时相显像在PHPT患者的术前定位中有重要价值,特别是在PHPT中有极高的准确率。与PHPT相比,SHPT血清PTH、AKP水平升高更明显,多表现为多个病灶,病灶小,易合并钙化。     

99 Tcm-MIBI与99Tcm-MDP骨显像诊断 骨良恶性病变的比较

目的　对比分析99Tcm 甲氧基异丁基异腈 (MIBI)和99Tcm 亚甲基二膦酸盐 (MDP)对骨良恶性病变的诊断价值和疗效评估。方法　 6 1例临床拟诊骨良恶性病变患者分别进行 2项骨显像 ,其中 6例恶性肿瘤患者分别进行化疗前后显像。显像后均经手术、病理检查对比分析。结果　99Tcm MIBI显像 :73 %恶性肿瘤病灶肉眼见中、高度MIBI浓聚 ,6 0 %良性病灶肉眼未见MIBI聚集。恶性病灶部位与对侧正常组织放射性计数比值 (L C)即99Tcm MIBI摄取比值 (3 0 8± 1 6 7)明显高于良性病灶(1 36± 0 6 4) ,P <0 0 1。99Tcm MDP显像 :大多数恶性或良性病灶肉眼见中、高度MDP浓聚 ,但恶性病灶99Tcm MDPL C(3 76± 1 37)与良性病灶L C(3 10± 1 0 5 )比较差异无显著性 (P >0 0 5 )。化疗可以抑制99Tcm MIBI摄取 ,99Tcm MIBI摄取程度与99Tcm MDP比较能较好反应治疗效果。结论　99Tcm MIBI对鉴别诊断良恶性骨病和评估疗效有较好的应用价值 ,与99Tcm MDP显像联合应用可更全面地提供信息     

99锝m N-2-巯基吡啶-N-氧化物与99锝m-甲氧基异丁基异腈对犬急性心肌梗死模型的对照研究

目的 在正常和心肌梗死犬模型上,研究99TcmN-2-巯基吡啶-N-氧化物(99TcmN-MPO)的药物代谢动力学特征、生物学分布特征和对急性心肌梗死的诊断能力,并与传统示踪剂99锝m-甲氧基异丁基异腈(99Tcm-MIBI)进行对比研究.方法 正常杂种犬12只.静脉注射99TcmN-MPO,于不同时间点(30 s及1、2、3、4、5、10、20、30、40、60和90 min)静脉分别采血1 ml,经γ探测器测量其放射活性;注药后10、20、30、60、90及120 min行全身SPECT显像,并于不同器官上各取同样大小的ROI,测量其放射性计数进行定量研究.每只犬均注射相同剂量的99TcmMIBI,进行相同的实验作为对照.介入学方法构建犬急性心肌梗死模型,24 h后,静脉注入99TcmN-MPO(5只)和99Tcm-MIBI(5只),并于注药后30、60min进行心肌SPECT显像.结果 在静脉注射90 min内,99TcmN-MPO和99Tcm-MIBI均表现为快速的血液清除.两种示踪剂的初始注射剂量均为370 MBq.注射后1 min,每毫克血浆的放射活性小于初始注射剂量的50%[99TcmN-MPO为(35.77±6.31)%ID/mg;99Tcm-MIBI为(34.46±6.83)%ID/mg],30 min时＜5%[99TcmN-MPO:(3.11±1.44)%ID/mg;99Tcm-MIBI:(2.93±0.39)%ID/mg].99TcmN-MPO在心脏的浓聚明显,且存留时间很长,由于其在肝脏清除的速度较快,因此可获得良好的心/肝摄取比值,注射后10 min为0.54±0.06,30 min为1.02±0.06,60 min上升到1.38±0.06.相比之下,99Tcm-MIBI的心/肝摄取比值上升较为缓慢(注射后10 min为0.46±0.03,30 min为0.63±0.03,60 min为0.62±0.12).犬心肌梗死后SPECT心肌断层扫描显示,在注射99TcmN-MPO 30 min后,心脏与肝脏分界清楚,可清楚显示心肌缺血、梗死灌注缺损区域、范围和程度;而99Tcm-MIBI注射后60 min,心脏和肝脏的分界依然不清,尤其是肝脏的高放射性对心脏下壁和左心室壁的影响很大,对心脏左心室壁的心肌梗死灌注缺损区域的显示不佳.结论 99TcmN-MPO具有心肌摄取量较高,肝脏代谢快的特点,是一种具有广阔临床应用前景的SPECT心肌灌注成像显像剂.

Abstract：

Objective The purpose of the present study is to compare the pharmacokinetic and biodistribution properties of 99Tcm N-mercaptopyridine-N-oxide (99 Tcm N-MPO) with 99 Tcm-sestamibi (99 Tcm-MIBI) in normal dogs, and to investigate the potential of 99TcmN-MPO as a myocardial perfusion agent in canines with acute myocardial infarction. Methods Twelve healthy mongrel dogs were injected intravenously with 99TcmN-MPO (n = 6) or 99Tcm-MIBI (n = 6). Tracer kinetics in body fluids were determined by collecting blood of 1 ml via a femoral vein catheter at 30 s, 1,2,3,4,5, 10, 20, 30, 40, 60and 90 min post-injection (p. i.). The collected blood samples were weighed and counted for radioactivity in a γ-counter. Anterior and posterior planar γ-camera images were collected at 10, 20, 30, 60, 90, and 120 min after injection, with organ uptake quantified by region-of-interest (ROIs) analysis. For comparison, 99Tcm-MIBI was also evaluated in the same twelve dogs. Canine infarct models were set up by micro-invasive interventional embolization. SPECT images in the canine infarct model were collected 24 hours after myocardial infarction at 30 min and 60 min after the administration of 99Tcm N-MPO (n = 5) or 99Tcm-MIBI (n = 5). Results Both of 99Tcm N-MPO and 99Tcm-M1BI had a rapid blood clearance with less than 50% of initial radioactivity remaining at 1 min [99TcmN-MPO: (35. 77 ± 6. 31)% ID/mg ,99Tcm-MIBI (34. 46 ± 6. 83) % ID/mg] and less than 5% at 30 min p. i. [99Tcm N-MPO(3. 11 ± 1.44) % ID/mg,99Tcm-MIBI (2.93 ±0. 39)% ID/mg] . After injection, 99TcmN-MPO showed significant accumulation in the myocardium and prolonged retention. This rapid liver clearance of 99TcmN-MPO led to favorable heart-to-liver ratios, reaching values of 0. 54 ±0. 06 at 10 min, 1.02 ±0. 06 at 30 min, and 1.38 ±0. 06 at 60 min p. i.In contrast, the heart/liver ratio of 99Tcm-MIBI remained low at all time points (0. 46 ± 0. 03 at 10 min,0. 63 ±0. 03 at 30 min, and 0. 62 ± 0. 12 at 60 min p. i.). SPECT imaging studies in canines with acute myocardial infarction indicated that good visualization of the left ventricular wall and perfusion defects could be achieved at 30 min after administration of 99TcmN-MPO, but not 99Tcm-MIBI. Conclusion The combination of high heart uptake and rapid liver clearance makes 99TcmN-MPO a promising new radiotracer for myocardial perfusion imaging.     

缺血心肌99Tcm-MIBI清除率变化的临床研究

目的 探讨缺血性心脏病（IHD）患者心肌99Tcm-甲氧基异丁基异腈（MIBI）早期、晚期清除率的变化及其评估缺血心肌细胞功能障碍的价值.方法 对临床诊断为IHD并满足冠状动脉三支主要分支狭窄均≥50%、除外心肌梗死的16例患者行99Tcm-MIBI静态平面及门控心肌灌注断层显像.用t检验比较99Tcm-MIBI早期（注药后90 min）、晚期（注药后4 h）清除率及左心室射血分数（LVEF）与健康对照组（10名）的差异,并对早期、晚期清除率与LVEF行直线相关分析.结果 IHD组早期、晚期心肌清除率及LVEF分别为（13.44±2.87）%、（19.24±4.71）%和（55.71±7.97）%,健康对照组分别为（17.32±4.92）%、（15.23±3.81）%和（67.75±5.43）%,2组相比差异均有统计学意义（t值分别为2.384,-2.246及-4.418,P均＜0.05）.早期及晚期清除率与LVEF不具有相关性,r值分别为-0.212（P＞0.05）及0.352（P＞0.05）.结论 IHD患者心肌99Tcm-MIBI清除率异常可反映缺血引起的细胞功能损伤.     

Uptake of liposome-encapsulated 99Tcm-MIBI by sensitive and multidrug-resistant tumour cell lines.

It is well established that accumulation of 99Tcm-sestamibi (99Tcm-MIBI) is much higher in sensitive than multidrug-resistant tumour cells expressing the permeability glycoprotein 170 (Pgp 170) as well as a multidrug-resistance related protein (MRP). Thus 99Tcm-MIBI is a good candidate for diagnosing the multidrug-resistance phenotype by in vivo imaging. However, the blood clearance of 99Tcm-MIBI is too rapid to achieve optimal accumulation in tumours and uptake in the liver, spleen, heart and muscle is too high for it to be an excellent in vivo tumour tracer. One way of prolonging the bioavailability of 99Tcm-MIBI is to use liposomes which do not affect its accumulation in tumour cells. We explored this possibility in vitro using two sensitive and five resistant cell lines, two of them expressing Pgp 170 and three others over-expressing MRP. 99Tcm-MIBI was incorporated into liposomes prepared by thin film hydration with phosphate-buffered saline using distearoyl phosphatidyl choline, distearoyl phosphatidyl ethanolamine and cholesterol in a ratio of 1.85:0.15:1.00. Liposome diameter was 97.9 +/- 4.5 nm as determined by dynamic light scattering. 99Tcm-MIBI uptake was quantified by measuring radioactivity retained in the cells incubated at 37 degrees C with liposome-encapsulated 99Tcm-MIBI or with free radiotracer in the presence of empty liposomes. In both experimental cases, 99Tcm-MIBI accumulation was similar to that obtained in the presence of free 99Tcm-MIBI only: it was much higher in sensitive than in resistant Pgp 170-positive and MRP-positive cells. Encapsulation in liposomes does not alter the potency of 99Tcm-MIBI to distinguish the sensitive and resistant tumour cells. Our results suggest that future studies should assess the usefulness of the encapsulated form of 99Tcm-MIBI for in vivo imaging of tumours.     

99mTc-HMPAO-labeled liposomes: an investigation into the effects of some formulation factors on labeling efficiency and in vitro stability

Technetium-99m complex of hexamethyl-propylene-amineoxime (HMPAO) is used as an efficient agent to label liposomes. For this, ^99mTc-HMPAO is incubated with preformed liposomes that contain glutathione (GSH). Effect of GSH and lipid concentration on labeling efficiency, as well as the effect of lipid composition on in vitro stability of labeled liposomes, was investigated in the present study. d,l-HMPAO was synthesized and kits including d,l-HMPAO and SnCl₂·2H₂O were optimized at 0.5 mg HMPAO, 5.0 μg SnCl₂·2H₂O and pH 7, and lyophilized. DSPC/CHOL (molar ratio 2:1) liposomes encapsulating GSH were labeled with ^99mTc-HMPAO prepared kits. Increase of GSH concentration in hydration buffer from 5 to 200 mM during liposome preparation resulted in a broad labeling efficiency of liposomes ranging from 4.16% to 69.81%. An initial approximate concentration of 100 mM GSH in the hydration buffer seems to be appropriate for a good labeling efficiency. At the optimum concentration of GSH, change of the total initial lipid concentration from 10 to 70 mM did not produce a remarkable difference in labeling efficiency. Study of the effect of lipid composition on the stability of liposomes showed that all three kinds of labeled liposomes composed of DSPC/CHOL, DPPC/CHOL and DMPC/CHOL (molar ratio 2:1) had good in vitro stability in human plasma at 37°C for 48 h; however, employing DSPC resulted in the most stable ones.     

99Tcm—MIBI显像对腮腺区肿块的诊断价值

目的探讨99Tc^m_MIBI显像在腮腺肿块术前定性诊断中的价值。方法对32例单侧腮腺肿块患者术前行腮腺区99Te^m-MIBI显像,所有病例均行早期和延期显像以判断肿块性质。判断结果与病理诊断相比较。定性分析行Fisher确切概率法检验,组间病变侧与对侧放射性摄取比值（T／N）比较行t检验。结果99TcA^m．MIBI显像对腮腺区恶性肿瘤诊断的灵敏度、特异性和准确性分别为90．00％（9／10）、86．36％（19／22）和87．50％（28／32）。22例腮腺区良性肿块中显像阴性19例（86．36％）,假阳性3例（13．64％）;10例腮腺恶性肿块中显像阳性9例（90．00％）,假阴性1例（10．00％）;定性分析经Fisher确切概率法检验差异有统计学意义（P=0．00018）。腮腺区良恶性肿块T／N：早期相分别为1．45±0．38和1．65-t-O．63,两者差异有统计学意义（t=20．4,P〈0．01）;延期相分别为1．43±0．56和1．77-4-0．59,两者差异也有统计学意义（t=2．4,P〈0．05）。结论99Tc^m一MIBI显像可作为腮腺区肿块术前定性诊断的有效辅助手段。     

肥厚型心肌病患者心肌MIBI清除率的临床研究

目的 探讨肥厚型心肌病(HCM)患者心肌99Tcm-甲氧基异丁基异腈(MIBI)早、晚期清除率的变化以及早、晚期清除率与左室壁心肌肥厚程度的关系.方法 对临床确诊为HCM的15例患者行99Tcm-MIBI静态平面及门控SPECT显像.比较HCM患者99Tcm-MIBI早期(注药后90 min)及晚期(注药后4 h)清除率与健康对照组(健康志愿者12名)间的差异(采用SPSS 13.0软件,行t检验),并对早、晚期清除率与左室壁心肌肥厚程度行Pearson直线相关性分析.结果 HCM患者组早期及晚期心肌99Tcm-MIBI清除率分别为(27.77±2.60)%及(42.66±3.30)%,健康对照组分别为(18.90±3.70)%及(31.27±4.04)%,2组比较差异均有统计学意义(t值分别为-7.320,-8.069,P均<0.01).HCM患者组左室壁肥厚心肌最大厚度为(26.53±6.57)mm,健康对照组为(15.92±1.29)mm,2组比较差异亦有统计学意义(t值为-6.110,P<0.01).HCM早期及晚期清除率与左室壁肥厚心肌最大厚度间有较好的相关性(r值分别为0.611及0.873,P<0.05和<0.01).结论 HCM患者心肌99Tcm-MIBI早期及晚期清除率明显高于健康对照组,且早、晚期清除率与左室壁心肌肥厚程度均有一定的相关性.