后置环磷酰胺预处理方案对异基因造血干细胞移植后移植物抗宿主病的预防效果

目的 观察后置环磷酰胺预处理方案对异基因造血干细胞移植后移植物抗宿主病(GVHD)的预防效果。方法 29例拟行异基因造血干细胞移植的急性白血病患者，其中15例患者采用后置环磷酰胺预处理方案(观察组)、14例患者采用经典白消安/环磷酰胺方案预处理(对照组)。观察组患者移植前第3～7天氟达拉滨30 mg/(m²·d)静脉滴注，移植前第3～6天白消安注射液0.8 mg/kg静脉滴注(6 h一次)，移植第3、4天环磷酰胺50 mg/(m²·d)静脉滴注；对照组移植前第3～6天白消安注射液0.8 mg/kg静脉滴注(6 h一次)，移植前第3、4天环磷酰胺60 mg/(kg·d)静脉滴注。主要观察指标为移植后急慢性GVHD及移植相关并发症发生情况，次要观察指标为细胞移植所需时间、患者总生存期与无进展生存期。结果 观察组患者移植后急性GVHD3例、慢性GVHD1例，对照组患者移植后急性GVHD5例，两组急、慢性GVHD发生情况间差异无统计学意义。两组中性粒细胞、血小板植入时间及移植相关并发症发生情况间差异无统计学意义。观察组1、2年的总生存率分别为93.3...     

氟达拉滨联合静脉马利兰的预处理方案治疗髓系恶性血液病的临床研究

目的:评价氟达拉滨(Flu)联合静脉马利兰(Bu)的预处理方案在髓系恶性血液病患者异基因造血干细胞移植(allo-HSCT)中的疗效及静脉Bu的最佳剂量。方法:45例接受allo-HSCT的髓系恶性血液病患者,预处理方案主要采用Bu3.2mg·kg-1.d-1×2～4d,Cy40～50mg/kg×2d,Flu30mg.m-2.d-1×3d,Ara-C2g.m-2.d-1×3d,无关供者移植同时加用兔抗人血清免疫球蛋白(ATG)2.5mg/kg×4d。按静脉Bu用量进一步分为2d组17例,3d组18例,4d组10例。结果:预处理过程无严重不良事件发生,无肝静脉闭塞病(VOD)发生,Ⅱ～Ⅳ度急性移植物抗宿主病(aGVHD)9例(20%),100d移植相关死亡(TRM)1例(2.2%),3年TRM15例(33.3%),3年累计复发3例(6.7%),3年无病生存率(DFS)和3年总体生存率(OS)分别为(60.5±7.5)%和(62.2±7.2)%。与Bu2d组和3d组比较,4d组患者的慢性GVHD的发生率显著增高,TRM有增高趋势;OS显著降低,DFS有降低趋势。结论:Flu联合静脉Bu的预处理方案治疗髓系恶性血液...     

减低剂量预处理对异基因造血干细胞移植治疗恶性血液病疗效观察

目的:探讨应用减低剂量的氟达拉宾、白消安和环磷酰胺(FBC)方案预处理对异基因造血干细胞移植(alloHSCT)治疗恶性血液病疗效的影响。方法:19例恶性血液病患者移植前进行减低剂量的FBC预处理。采用磷酸氟达拉宾(Flud)30mg/m2·d-1静脉滴注5d。白消安(Bu)0.6mg/kg、4次/d,共3d。环磷酰胺(CTX)30mg/kg·d-1静脉滴注,共2d,随后施行HLA配型的同胞或父亲供者的造血干细胞移植。术后采用环孢素及霉酚酸酯预防移植物抗宿主病(GVHD)。结果:全部患者的造血功能均获得快速重建。白细胞升至1.0×109/L以上,中位时间为(11.4±4.6)d。中性粒细胞升至0.5×109/L以上,中位时间为(11.9±6.7)d;血小板升至20×109/L以上,中位时间为(12.2±3.5)d。供者细胞完全植入15例,混合嵌合性植入4例,1例出现宿主排斥移植物(HVG)反应,进行供者淋巴细胞输注(DLI)2次后,达到完全供者嵌合。11例出现急性GVHD(57.89%),7例出现慢性GVHD(36.83%),2例HLA配型不完全相合者死于急性GVHD。结论:减毒的FBC预处理方案allo-HSCT治疗恶性血液病疗效肯定,并发症少,是治疗恶性血液病的有效方法。     

以静脉注射和口服白消安为预处理行HLA半相合造血干细胞移植治疗恶性血液病的比较

目的:比较以静脉注射和口服白消安(Bu)为预处理方案行亲属间HLA半相合外周血造血干细胞移植在造血重建、移植物抗宿主病(GVHD)、预处理相关毒性及并发症和疗效的差异,观察白消安注射液(ivBu)的疗效和安全性.方法:20例恶性血液病患者中,10例采用静脉注射Bu为预处理方案(ivBu组),10例采用口服Bu为预处理方案(口服Bu组),回顾性分析2组移植后造血重建、GVHD、预处理相关毒性及并发症和疗效情况.结果:ivBu组和口服Bu组移植后均获造血功能重建,2组中性粒细胞绝对值≥0.5×109/L的中位时间均为14 d(P>0.05),血小板计数≥20×109/L的中位时间分别为12和13 d(P>0.05),ivBu组急性GVHD发生率为10.0%,低于口服Bu组(50.0%)(P>0.05),慢性GVHD的发生率在2组中分别为20.0%和60.0%(P>0.05),2组在预处理相关毒性及并发症方面差异无统计学意义(P>0.05),ivBu组1例因间质性肺炎死亡,2组分别有1例和2例复发,余16例无病生存.结论:ivBu组和口服Bu组在造血重建、GVHD、预处理相关毒性及并发症等的差异均无统计学意义,以ivBu为主的预处理方案治疗血液病是安全有效的.     

HLA半相合非清髓异基因造血干细胞移植治疗难治性急性白血病1例

目的探讨HLA半相合非清髓异基因造血干细胞移植(NAST)在治疗难治性急性白血病中的作用。方法2002-06采用非清髓预处理的NAST治疗军事医学科学院附属307医院难治性急性髓性白血病患者1例。预处理方案主要由抗淋巴细胞球蛋白(ATG)、阿糖胞苷(Ara-C)、氟达拉滨(Flu)和环磷酰胺(CTX)等组成。移植物抗宿主病(GVHD)的预防采用环孢素A(CSA)、霉酚双酯(MMF)、甲氨蝶呤(MTX)和CD25单抗。结果患者移植过程顺利,于移植后第100d转为完全供者型植入。患者于移植后出现皮肤Ⅰ度GVHD,经治疗后好转。结论应用HLA半相合NAST治疗难治性急性白血病患者,简便安全,疗效好,为无HLA相合供者的白血病患者治疗开辟了新的治疗手段。     

马利兰和氟达拉滨与马利兰和环磷酰胺预处理方案在急性髓性白血病异基因造血干细胞移植中的比较

 目的 比较马利兰（Bu）和氟达拉滨（Flu）组成的预处理方案（Bu/Flu）与Bu和环磷酰胺（Cy）组成的预处理方案（Bu/Cy）在急性髓性白血病第一次完全缓解（AML-CR1）患者异基因造血干细胞移植（allo-HSCT）中的移植相关毒性和疗效的差异。方法 32例接受allo-HSCT的AML-CR1患者按移植顺序交替分至Bu/Cy组（Bu 3.2 mg·kg^-1·d^-1,移植前第7~4天;Cy 60 mg·kg^-1·d^-1,移植前第3~2天）或Bu/Flu组（Bu 3.2 mg·kg^-1·d^-1,移植前第5～2天;Flu 30 mg·m^-2·d^-1,移植前第6～2天）。评价两组预处理相关毒性（RRT）、移植物抗宿主病（GVHD）发生率与严重程度、3年累积复发率、非复发死亡率（NRM）、3年无病生存（EFS）率和总生存（OS）率等方面的差异。结果 中位随访时间为617.5（6~1261）d。两组中性粒细胞和血小板中位重建时间无明显差异（P=0.121和P=0.171）,移植后30 d嵌合状态分析提示两组患者均达到完全植入。Bu/Cy组预处理后中性粒细胞持续<0.1×10⁹/L和血小板持续﹤20×10⁹/L中位时间明显长于Bu/Flu组［6（3~14）d比2.5（1~9）d,P=0.000;3（1~36）d比1（0~4）d,P=0.047］。Bu/Cy组与Bu/Flu组Ⅱ～Ⅳ度RRT发生率分别为68.8%和25.0%（P=0.032）;急性GVHD发生率分别为46.7%和75.0%（P=0.149）,慢性GVHD发生率分别为46.7%和80.0%（P=0.149）;NRM分别为25.0%和6.3%（P=0.333）;3年累积复发率分别为（17.9±11.7）%和（14.1±9.3）%（P=0.834）;3年EFS率分别为（65.5±12.7）%和（80.2±10.3）%（P=0.362）;3年OS率分别为（68.8±11.6）%和（87.5±8.3）%（P=0.111）。结论 Bu/Flu是一种清髓性预处理方案,与Bu/Cy方案比较具有低骨髓抑制毒性及RRT。Bu/Flu作为AML-CR1患者allo-HSCT预处理方案其疗效不低于Bu/Cy。     

含全身照射预处理方案行HLA不相合非去T造血干细胞移植治疗白血病8例临床分析

目的探讨采用全身照射(TBI)预处理方案行人类白细胞抗原(HLA)配型不相合亲缘供者非去T异基因造血干细胞移植(allo-HSCT)治疗白血病的疗效。方法2002年4月至2007年1月北京大学血液病研究所8例采用TBI预处理方案行HLA不合非去T亲缘供者allo-HSCT的白血病患者,其中急性髓性白血病(AML)3例,急性淋巴细胞性白血病(ALL)4例,慢性粒细胞白血病1例;预处理方案采用TBI加环磷酰胺(CY)方案4例,TBI加氟达拉滨(FLU)方案4例;干细胞来源包括骨髓和外周血造血干细胞移植6例,外周血造血干细胞移植(PBSCT)2例;移植物抗宿主病(GVHD)预防采用经典的环孢素A(CsA) 霉酚酸酯(MMF) 短程甲氨蝶呤(MTX)方案。结果8例供者采集单个核细胞(MNC)中位数为7.39(6.27~12.46)×108/kg,粒细胞植入中位时间11(11~13)d,血小板植入中位时间13(11~21)d。5例发生Ⅰ~Ⅱ度急性GVHD,2例出现慢性广泛性GVHD,无严重急性GVHD或因GVHD死亡病例。中位随访时间9(3~53)个月,除1例复发存活外,其余病例无病存活。结论对于HLA不相合异基因造血干细胞移植,TBI方案是一种比较安全、有效的非去T预处理方案,对于高危和二次移植患者同样有效。     

减低预处理剂量的异基因造血干细胞移植治疗骨髓增生异常综合征

目的:评估10例骨髓增生异常综合征(MDS)患者进行非清髓异基因造血干细胞移植的效果。方法:10例MDS患者中位年龄44岁,MDS-难治性贫血(RA)1例[国际预后积分系统(IPSS)中危-Ⅰ],MDS-难治性血细胞减少伴有多系增生异常(RCMD)5例(IPSS中危-Ⅰ4例,中危-Ⅱ1例),MDS转变为急性髓系白血病4例(均为IPSS高危)。人类白细胞抗原(HLA)完全相合同胞移植7例,HLA匹配无关供者移植3例。预处理方案以白消安8～10mg/kg、氟达拉滨90～150mg/m2及全身照射2～3Gy为主,移植物抗宿主病(GVHD)预防方案为环孢素、短程甲氨蝶呤和麦考酚酸酯。移植后供受者嵌合体检测采用PCR扩增短串联重复序列方法,对流式细胞仪分选出的T淋巴细胞、自然杀伤(NK)细胞和粒细胞进行动态定量检测。结果:移植后异基因造血干细胞都成功植入,中性粒细胞>0.5×109/L的中位时间为12(10～14)d,血小板>50×109/L的中位时间为13(0～29)d。10例患者中8例发生急性GVHD,其中仅1例患者发生Ⅳ度急性GVHD,其余患者为Ⅰ度。中位随访22(3.6～70)个月,5例发生慢性GVHD。2例患者死亡,均在移植前转变为急性髓系白血病,其余8例患者均无病生存至今,血细胞数恢复正常,中位生存时间为27(15～70)个月,预期5年总生存率为79%。结论:减低预处理剂量的异基因造血干细胞移植是治疗MDS或MDS继发急性髓系白血病的有效方法。移植后需要进行嵌合体的密切监测,根据供受者嵌合比例,尤其是T淋巴细胞嵌合比例给予个体化免疫抑制剂治疗,避免复发。     

异基因造血干细胞移植治疗43例慢性粒细胞白血病疗效分析

目的:评价采用一种新预处理方案行异基因造血干细胞移植(allo-HSCT)治疗慢性粒细胞白血病(CML)患者的疗效。方法:2005年1月-2008年12月对43例CML患者进行allo-HSCT,采用白消安加环磷酰胺联合氟达拉滨、阿糖胞苷(Bu/Cy/Flu/Ara-C)为预处理方案,具体剂量为Bu3.2mg·kg-1·d-1静点(iv)或4mg·kg-1·d-1口服(po)2～4d、Cy50mg·kg-1·d-1×2、Flu30mg·m-2·d-1×3、Ara-C2g·m-2·d-1×3。移植方式为HLA相合或半相合亲缘供者造血干细胞移植,其中外周血干细胞移植(PBSCT)16例,骨髓移植(BMT)26例,骨髓加外周血干细胞移植1例。结果:所有患者均获造血重建,发生Ⅱ～Ⅳ度急性移植物抗宿主病(aGVHD)12例(27.9%),慢性GVHD(cGVHD)19例(45.2%),移植相关死亡(TRM)9例(20.9%),细胞遗传学或血液学复发6例(14.0%),其中4例复发后采用格列卫与DLI联合的挽救治疗获得稳定的分子生物学缓解;总体无病生存率(DFS)为(72.0±7.0)%,其中CP1和非CP1期移植患者D...     

HLA半相合血缘性骨髓移植治疗慢性粒细胞白血病4例

目的:探索半相合未去除T细胞骨髓移植治疗慢性粒细胞白血病的可行性。方法:4例慢性粒细胞白血病患者接受HLA1或2个位点不相合亲缘骨髓移植。用阿糖胞苷、环磷酰胺和全身照射进行预处理,供者应用GCSF250μg/d,连用7d后采髓。移植物抗宿主病(GVHD)预防除用环孢菌素A(CsA)和甲氨蝶呤(MTX)外,在移植前第4天～第1天用抗胸腺细胞球蛋白ATG(兔抗)2.5mg/(kg·d),移植后第7天开始加用霉酚酸酯1.0g/d。结果:患者移植后均获得造血重建,中性粒细胞>0.5×109/L和血小板>20×109/L的中位时间分别是12.5(10～14d)和22d(18～25d)。4例患者发生急性Ⅰ度GVHD,其中1例2个位点不相合者进展为急性肠道和肝脏Ⅳ度GVHD,于+81d合并感染死亡。1例发生迟发性出血性膀胱炎。中位随访时间20个月(5～25个月)。无病存活3例,其中2例存活在1年以上。结论:供者应用GCSF后采髓,多种免疫抑制剂联合应用的HLA不全相合未去除T细胞骨髓移植,在治疗慢性粒细胞白血病过程中,有效地降低了急性重症GVHD发生,提高了无病生存。     

胰岛素瘤的解剖分布特点分析

目的胰岛素瘤是最常见的胰腺神经内分泌肿瘤，因其临床表现多样，导致诊断困难。影像学诊断尤其是超声内镜(EUS)在胰岛素瘤的诊断中起着重要作用，拥有较高的敏感性和特异性。本研究拟通过明确胰岛素瘤的解剖分布特点，以期有助于提高影像学的诊断准确率和降低漏诊率，尤其是在教育和培训实践中对于EUS的学习者更具有指导价值。 方法回顾性分析解放军总医院第一医学中心病案资料数据库1993年1月至2019年11月经外科手术、病理确诊为胰岛素瘤的患者的临床资料，检索方法采取搜索术后病理诊断为"胰岛素瘤"的病例，通过查阅病例的方法，提取出胰岛素瘤的大小和解剖分布等数据，进一步分析其特点。 结果共检索到确诊为胰岛素瘤的患者116例，其中，男45例、女71例，年龄13～76岁，平均年龄(44.4±14.85)岁。胰岛素瘤单发110例(94.8%)、多发6例(5.2%)。位置分布：头颈部46例(39.7%)，单发45例、多发1例；体尾部68例(58.6%)，单发65例、多发3例；全胰腺多发2例(1.7%)。病变大小特点：最大径0.4～3.4 cm，平均大小(1.53±0.58)cm。≤1 cm 29例、>1 cm而≤1.5 cm41例、>1.5 cm而≤2.0 cm28例，≤3 cm 15例，>3 cm 3例。年龄与肿瘤的大小相关，≤44岁患者肿瘤平均大小为(1.36±0.51)cm、>44岁患者肿瘤平均大小为(1.70±0.60)cm，P<0.05。头颈部的肿瘤大于体尾部的肿瘤，头颈部肿瘤平均大小(1.66±0.63)cm，体尾部(1.42±0.52)cm，P<0.05。 结论胰岛素瘤在胰腺体尾部较头颈部更好发；绝大多数单发，但可以全胰腺多发；多数小于1.5 cm，肿瘤的大小与患者年龄和肿瘤的解剖分布相关。     

Pathogenesis of carcinoma of the papilla of Vater

Most adenomas and carcinomas of the small intestine and extrahepatic bile ducts arise in the region of the papilla of Vater. In familial adenomatous polyposis (FAP) it is the main location for carcinomas after proctocolectomy. In many cases symptoms due to stenosis lead to diagnosis at an early tumor stage. In about 80%, curative intended resection is possible. Operability is the most relevant prognostic factor. Most ampullary carcinomas resp. carcinomas of the papilla of Vater develop from adenomatous or flat dysplastic precursor lesions. They can be sited in the ampulloduodenal part of the papilla of Vater, which is lined by intestinal mucosa. They also can develop in deeper parts of the ampulla, which are lined by pancreaticobiliary duct mucosa. Intestinal-type adenocarcinoma and pancreaticobiliary-type adenocarcinoma represent the main histological types of ampullary carcinoma. Furthermore, there exist unusual types and undifferentiated carcinomas. Many carcinomas of intestinal type express the immunohistochemical marker profile of intestinal mucosa (keratin 7?, keratin 20+, MUC2+). Carcinomas of pancreaticobiliary type usually show the immunohistochemical profile of pancreaticobiliary duct mucosa (keratin 7+, keratin 20?, MUC2?). Even poorly differentiated carcinomas, as well as unusual histological types, may conserve the marker profile of the mucosa they developed from. These findings underline the concept of histogenetically different carcinomas of the papilla of Vater which develop either from intestinal- or from pancreaticobiliary-type mucosa of the papilla of Vater. Molecular alterations in ampullary carcinomas are similar to those of colorectal as well as pancreatic carcinomas, although they appear at different frequencies. In future studies, molecular alterations in ampullary carcinomas should be correlated closely with the different histologic tumor types. Consequently, the histologic classification should reflect the histogenesis of ampullary tumors from the two different types of papillary mucosa.     

Demonstration of the mechanism of action of biguanides

Summary Palmitic acid oxidation in rat diaphragm homogenate is depressed by biguanide concentrations that are still incapable of inhibiting oxidative phosphorylation. Glucose oxidation is not directly effected by the same biguanide concentrations: however, the inhibitory effect of palmitic acid on glucose oxidation is partly removed by biguanides. Inhibition of fatty acid oxidation, which accounts for most of the metabolic effects caused by these drugs, can be regarded as the fundamental mechanism of action of biguanides. There is some evidence suggesting that these drugs might interact with carnitine, thus preventing long-chain fatty acids from being transported across the mitochondrial membrane to the site of oxidation. Traduzione a cura degli AA.     

Lack of correlation of degree of villous atrophy with severity of clinical presentation of coeliac disease

BACKGROUND AND AIM: Both the clinical presentation and the degree of mucosal damage in coeliac disease vary greatly. In view of conflicting information as to whether the mode of presentation correlates with the degree of villous atrophy, we reviewed a large cohort of patients with coeliac disease. PATIENTS AND METHODS: We correlated mode of presentation (classical, diarrhoea predominant or atypical/silent) with histology of duodenal biopsies and examined their trends over time. RESULTS: The cohort consisted of 499 adults, mean age 44.1 years, 68% females. The majority had silent coeliac disease (56%) and total villous atrophy (65%). There was no correlation of mode of presentation with the degree of villous atrophy (p=0.25). Sixty-eight percent of females and 58% of males had a severe villous atrophy (p=0.052). There was a significant trend over time for a greater proportion of patients presenting as atypical/silent coeliac disease and having partial villous atrophy, though the majority still had total villous atrophy. CONCLUSIONS: Among our patients the degree of villous atrophy in duodenal biopsies did not correlate with the mode of presentation, indicating that factors other than the degree of villous atrophy must account for diarrhoea in coeliac disease.     

血吸虫童虫生长发育及其机制的研究进展

血吸虫童虫是宿主免疫系统攻击的重要靶标,包括皮肤型、肺型和肝门型童虫。宿主分子对童虫生长发育具有重要作用。童虫生长发育机制包括免疫调节、信号转导、性别发育及凋亡等。肌动蛋白、组织蛋白酶、烯醇化酶和葡萄糖基转移酶等分子为血吸虫童虫生长发育的重要分子。本文对血吸虫童虫生长发育及其机制的研究进展做一综述。     

氯硝柳胺悬浮剂的毒性评价

目的评价氯硝柳胺悬浮剂的毒性，为现场大规模应用灭螺提供依据。方法按照中华人民共和国国家标准GB 15670-1995《农药登记毒理学试验方法》和鱼类毒性试验方法进行。结果经口、经皮肤的LDso雌、雄性大鼠均>5 000 mg/kg，经呼吸道的LCso雌、雄性大鼠均>5 000mg/m3，该药经口、经皮肤、经呼吸道毒性均属微毒类药物；兔眼用药后，观察期内无不良反应，对眼无刺激性；皮肤用药后对皮肤无刺激性。与氯硝柳胺原药、氯硝柳胺乙醇胺盐原药和氯硝柳胺乙醇胺盐可湿性粉剂相比，氯硝柳胺悬浮剂对鱼急性毒性最低。结论氯硝柳胺悬浮剂属微毒类药物，对鱼的毒性低于其乙醇胺盐可湿性粉剂，适合于现场应用。     

124例耐多药结核分枝杆菌基因突变特征分析

目的对临床分离的耐多药结核分枝杆菌相关基因的突变特征进行分析。方法对124例耐多药结核分枝杆菌以及50株敏感株的耐药相关基因(包括异烟肼inh A、kat G、oxyR-ahp C间隔区以及利福平rpo B)进行序列测定,分析其基因突变情况。结果异烟肼耐药inh A基因突变率为14.5%;kat G基因突变率为70.2%(87/124),主要位于315位;oxyR-ahp C间隔区突变率为15.3%;inh A、kat G两种基因同时突变率75.0%,三种基因同时突变率为89.5%。利福平rpo B基因突变的检出率高达95.2%,突变主要发生在531、526、516位点。结论我省耐多药菌异烟肼耐药相关基因最常见突变为kat G 315、inh A C-T(-15)、axyR-ahp C间隔区(-10)C-T,利福平为rpo B531、526、516。结合MDR-TB耐药相关基因的特征分析,可以建立一种快速、准确、特异的适合于我省的检测结核菌耐多药性的新方法。     

Assessment of quality of life of parents of children with juvenile chronic arthritis

The aim of the study was to assess the quality of life (QOL) and the psychological status of parents of children with juvenile chronic arthritis (JCA). The QOL, anxiety and depression of the parents of 28 children with JCA were evaluated and compared to those of the parents of 28 healthy children. Mothers of JCA children and mothers of healthy children reported similar QOL. The reported anxiety and depression levels were similar for mothers and fathers in both groups. The parents of children with pauciarticular-type JCA reported lower QOL and higher levels of anxiety and depression than the parents of children with other types, namely polyarticular and systemic JCA. These findings may be explained by the fact that the pauciarticular patients had shorter disease duration and were less frequently seen in the outpatient clinic. The QOL of mothers of children with JCA was found to be slightly impaired in the group of children with pauciarticular JCA. Future larger studies are needed to confirm these results, as the number of subjects in the three groups was rather low. Received: 26 September 2001 / Accepted: 8 February 2002     

Numerical Simulation of the Effect of Rate of Change of Glucose on Measurement Error of Continuous Glucose Monitors

Background

A 5-day in-patient study designed to assess the accuracy of the FreeStyle Navigator® Continuous Glucose Monitoring System revealed that the level of accuracy of the continuous sensor measurements was dependent on the rate of glucose change. When the absolute rate of change was less than 1 mg•dl⁻¹•min⁻¹ (75% of the time), the median absolute relative difference (ARD) was 8.5%, with 85% of all points falling within the A zone of the Clarke error grid. When the absolute rate of change was greater than 2 mg•dl⁻¹•min⁻¹ (8% of the time), the median ARD was 17.5%, with 59% of all points falling within the Clarke A zone.

Method

Numerical simulations were performed to investigate effects of the rate of change of glucose on sensor measurement error. This approach enabled physiologically relevant distributions of glucose values to be reordered to explore the effect of different glucose rate-of-change distributions on apparent sensor accuracy.

Results

The physiological lag between blood and interstitial fluid glucose levels is sufficient to account for the observed difference in sensor accuracy between periods of stable glucose and periods of rapidly changing glucose.

Conclusions

The role of physiological lag on the apparent decrease in sensor accuracy at high glucose rates of change has implications for clinical study design, regulatory review of continuous glucose sensors, and development of performance standards for this new technology. This work demonstrates the difficulty in comparing accuracy measures between different clinical studies and highlights the need for studies to include both relevant glucose distributions and relevant glucose rate-of-change distributions.     

Angiographic diagnosis of the degree of serosal invasion of carcinoma of the colon

Angiography using Prostaglandin El^® was performed on 38 patients with carcinoma of the colon in order to diagnose the degree of serosal cancer invasion. The findings at angiography were classified into four groups:1) AG-S3, abnormal change (irregularity and/or encasement) up to marginal vessels; 2) AG-S2, abnormality up to vasa recta; 3) AG-S1, abnormality of penetrating branches of vasa recta within the wall of the colon; and 4) AG-S0, no distinct findings of abovementioned vessels. These angiographic findings were compared with both macroscopic and microscopic serosal cancer invasion. Angiographic diagnosis is in accord with the macroscopic findings in 84.2 percent of cases. Angiographic diagnosis is in accord with the microscopic findings in 32.4 percent of cases. Macroscopic findings confirm the angiographic diagnosis precisely but the conflict with microscopic findings should not be overlooked. This may be the result of inflammatory change, adhesion, and fibrosis around carcinoma of the colon.