Use of a new mixture for embolization of intracranial vascular malformations

Summary The internal carotid artery system in swine has a special anatomic configuration similar to a brain arterial-arterial malformation. The internal carotid artery breaks up into a multitude of fine channels (rete mirabile) situated at the base of the skull on the side of the hypophysis. This anatomic arterial model was used to analyze acute and chronic angiographic and histological changes after occlusion of the rete mirabile with I) avitene, II) avitene, and 50% ethanol, III) avitene, 30% ethanol and Polyvinyl alcohol, IV) avitene 50% ethanol and Polyvinyl alcohol, V) IBCA and VI) silk. Histopathological changes observed in the rete mirabile six weeks following occlusion demonstrated that a mixture of avitene, 30% ethanol and Polyvinyl alcohol and IBCA produced the best anatomic results. Embolization with avitene, PVA and ethanol induced a more bland histological reaction than the one observed with IBCA. Preliminary clinical experience with this mixture is reassuring in those cases in which the AVM was surgically resected. The partially thrombosed AVM was easily depressed and compressed by the neurosurgeon allowing for satisfactory hemostasis in and around the nidus of the AVM.This paper was presented in part at the International Symposium on Cerebral Stroke, Sendai, Japan, 1987     

牙龈成纤维细胞与牙周韧带细胞在二种玻璃离子水门汀上附着及增？…

目的 比较人类牙龈成纤维细胞（ＨＧＦ）与牙周韧带细胞（ＰＤＬＣ）在两种玻璃离子水门汀（ＧＩＣ）上的附着及增殖情况。方法 利用体外细胞培养技术及＾３Ｈ－ＴｄＲ掺入法检测ＨＧＦ及ＰＤＬＣ在两种ＧＩＣ上的附着及ＤＮＡ合成。结果 ＨＧＦ与ＰＤＬＣ在培养板上的附着及ＤＮＡ合成差异无显著性（Ｐ〉０．０５）,但ＨＧＦ在ＧＩＣ上的附着及ＤＮＡ合成明显强于ＰＤＬＣ（Ｐ〈０．０５）。结论 Ｋｅｔａｃ Ｆｉｌ和Ｆｕｊｉ     

弹性材料修复前牙缺失的临床探讨

目的 为探讨弹性材料在修复前牙缺失中的临床效果,进一步推广应用弹性材料在口腔修复美容中的价值。方法 利用美国Valpast公司研制的弹性材料,湖南长沙AULEN公司生产的隐形义齿机。选择前牙缺失患者216例,按临床要求制备基牙工作模型,制作蜡型装合,加热去腊后灌注弹性材料,冷却后取出铸件修整抛光。结果 216例患者修复298颗牙,两年后随访168例,优良者156例,占92．86％;一般者8例,占4．76％;较差者4例,占2．38％。结论 本方法修复前牙缺失与传统方法相比,无需金属卡环支架固位,具有美观、舒适、超薄、耐磨、制作快捷、简单等优点,是修复前牙缺失的理想材料及方法,值得临床推广应用。     

三维CT在颅底缺损重建中的作用

目的 用三维CT技术进行颅底重建手术的分析、设计、提高一期重建的成功率。方法 手术前联合采用三维CT、MRI或CT了解病变与颅底的关系,颅底缺损的大小、范围及所涉及的重要结构。根据不同情况设计相应手术方案,以自体骨、颞肌瓣和硅橡胶为修复材料。结果 10例中1例颅骨纤维结构不良者发生脑膜炎。3周后痊愈。余9例无类似或组织下垂、脑脊液鼻漏等并发症。结论 三维CT为分析颅底重建手术方案提供了立体分析资料,同时也为手术后评价颅底重建效果提供了直接的实体影像。     

Experimental study and clinical use of poly(vinyl acetate) emulsion as liquid embolisation material

A new material, an emulsion of poly(vinyl acetate) was experimentally developed and clinically used to overcome several disadvantages in currently used liquid embolisation materials. The emulsion microparticles, 0.3–0.7 m in size, possessed cationic charge on the surface and hence aggregated immediately on contact with fluids containing anions. This inert polymer has the advantage that it does not induce a deleterious reaction in living tissue. Moreover, its medium is water and it is not adhesive, like the cyanoacrylates. Several concentrations of emulsion were injected into the renal arteries of dogs. For the investigation of tissue reactions and the possibility of recanalisation, the emulsion was injected into rats both subcutaneously and into the renal arteries. The renal artery injections in dogs showed adequate radiopacity and consistent complete occlusion. The lower the concentration of the emulsion, the smaller the arteries which could be occluded. Even at very low concentrations, however, venous occlusion did not occur. Histological study of the embolised rat kidney revealed no detectable damage in the vessel wall and no recanalisation for up to 6 months. The subcutaneously injected PVAc emulsion elicited mononuclear cell infiltration and gradual centripetal fibrosis, without any deleterious effect on the surrounding tissue. A cerebral arteriovenous malformation (AVM) was embolised using the material. Histology of the resected nidus showed findings similar to those in the animal experiments.     

延迟焦化装置综合优化控制策略的开发和应用

综合采用延迟焦化优化系统静态寻优值作为炉出口温度的设定基准值,在线实行急冷油程序控制和炉出口温度程序控制,开发了延迟焦化装置物料平衡的综合优化控制策略。并成功地应用在工业装置上。     

生大黄用于急性出血坏死型胰腺炎治疗的临床探讨

目的　探讨生大黄用于急性出血坏死型胰腺炎治疗的可行性。方法　对 4 1例急性出血坏死型胰腺炎随机分为两组 :治疗组 2 2例 ,在常规治疗 (包括善得定的应用 )的基础上 ,给予生大黄 2 0克胃管内给药 ,每日 3～ 4次 ;对照组 1 9例给予常规治疗。结果　治疗组 2 2例 ,出现并发症 5例 ,占 2 2 .7%,死亡 2例 ,病死率 9.1 %;治疗期间出现肠麻痹 2例 ,占 9.1 %,肠蠕动恢复时间平均 3天。对照组 1 9例 ,出现并发症 1 3例 ,占 68.4 %,死亡 2例 ,病死率 1 0 .5 %,治疗期间出现肠麻痹者 7例 ,占 3 6.8%,肠蠕动恢复时间平均 5天。两组患者发生并发症概率有显著差异性 ( P <0 .0 0 5 )。出现肠麻痹的概率差异有显著性 ( P <0 .0 5 )。结论　生大黄对于促进肠蠕动、解除肠麻痹、减低肠管内压力、抑制胰酶的释放、抗感染、加快体内毒素的排泄、改善胰腺微循环和改善全身血液循环起着重要的作用。在减少急性出血坏死型胰腺炎的并发症方面有良好的功效     

材料力学性能对人颞下颌关节力三维非线性模拟的影响

比较分析骨性结构和关节盘的材料力学性能对在活性基础上建立的人颞下颌关节（Ｔｅｍｐｏｒｏ－ｍａｎｄｉｂｕｌａｒｊｏｉｎｔ,ＴＭＪ）三维非线性有限元模型模拟ＴＭＪ力的影响。方法利用Ａｕｔｏ－ＣＡＤ软件及螺旋ＣＴ扫描技术与有限元应力分析方法的相结合在活性基础上建立ＴＭＪ三维非线性有元模拟型并比较下颌骨,关节窝和关节盘选用不同材料力学性能时关节内应力的变化。结果骨组织的各种向同性和各向异性特征使组成ＴＭＪ     

疝环充填无张力疝修补术（附50例报道）

目的 观察疝环充填无张力疝修补术的临床应用效果。方法 疝囊做高位剥离而不做高位结扎,用美国Bard公司生产的锥形疝环充填 物充填内环,再用该公司生产的成型补片于精溃后方贴补腹肥肉沟管后壁,其它步骤同传统的手术方法。结果 本组50例,手术时间为30-770分钟,平均40分钟。随访1年效果良好,未见并发症。结论 疝环充填无张力疝修补术具有疼痛轻微、复发率低以及术后恢复快等优点。     

Crystalluria in marathon runners

Summary In order to investigate further the possible relationship between urinary stone formation and marathon running, the crystalluria in seven male, stone forming runners was characterized. Particle size distribution curves (Coulter counter) and crystal number, size and morphology (scanning electron microscopy) were measured. These studies suggest that urinary stone formation may be accelerated in those subjects with previous histories of renal stone formation but that the nature of the crystalluria is favourably affected by an increase in fluid intake. The presence of large quantities of mucoid material in the urine of natural stone formers and its absence in the urine of stone-forming runners is cited as evidence for the existence of different aetiological mechanisms in these groups. It is concluded that while natural stone formers may be at chronic risk of stone formation due to pathological factors, marathon runners may be at acute risk due to factors associated with long distance running itself.