Objective To observe the configuration and viability of full thickness human fetal retina after short-, mid- and long-term preservation. Methods Twenty-two full thickness human fetal retinae of gestational age of 12-24 weeks were coated by glutin and cut into 88 pieces, and then preserved in Ames' solution, DX solution, -80℃ refrigerator or under cryopreservation condition. The cell viability of retinal neuroepithelial layer was determined by trypan blue staining, retinal configuration was determined by light microscope and electromicroscope. Results The viability of neuroepithelial layer was (94.79plusmn;2.85) % in fresh fetal retina, gt;80% in Ames' solution within 4 hours, and gt;77% in DX solution within 2 days. There was no significant difference between those solution-preservations and the fresh fetal. In -80℃ refrigerator, the viability was (65.83plusmn;5.06)% after 7 days, and then dropped to (57.54plusmn;16.18)% at the end of the first month. Under the cryopreservation condition, the viability was (69.46plusmn;9.31)% at the end of first month. Light and transmission electron microscopy had not deteced any abnormals in the full thickness human fetal retina preserved in Ames' solution within 2 hours, but showed clear retinal layers with bigger intercellular space after preserved in DX solution for 2 days, in -80℃ refrigerator for 7 days and under cryopreservation condition for 1 month. Conclusion Ames' solution and DX solution can preserve good viability and configuration of full thickness human fetal retina in a certain time period.
ObjectiveTo study the development of methods assessing donor liver viability in liver transplantation.MethodsThe literature in the recent years on the methods of assessing donor liver viability was reviewed.ResultsFrom donor liver morphology to function,there have being developed many methods which assess donor liver viability,including:①donor liver appearance; ②intraoperative biopsies; ③donor liver microcirculation; ④portal pressure; ⑤enzymes levels in liver; ⑥lidocainemetabolizing activity; ⑦energy metabolism of donor liver; ⑧fat content in donor liver.ConclusionThere are many methods to assess the viability of donor liver. Each has its supericrity and defect respectively. Intraoperative biopsies, 31Pmagnetic resonance spectroscopy and portal pressure have more importance in clinical application.
Objective To evaluate the indications, effectiveness and complications of vitreoretinal surgery using the 25G transconjunctival sutureless vitrectomy system (TSV25G) under the topical anesthesia. Methods The clinical and follow-up data of 22 eyes of 22 patients undergone vitreo-retinal surgery using TSV25G under the topical anesthesia were retrospectively analyzed. All of the patients were monocular sickened, including idiopathic macular hole in 10 eyes, idiopathic macular pucker in 6, vitreoretinal traction syndrome in 4, and vitreous hemorrhage associated with branch retinal vein occlusion in 2. Peeling of epiretinal membrane and/or internal limiting membrane, intra ocular laser coagulation, air-fluid exchange and tamponiding of C3F8 were performed according to the condition of diseases. The postoperative follow-up was 1-11 months, with the mean duration of 6.4 months. The effect of analgesia, cooperation with the patients, operative effect and complications in and after the surgery were observed. Results The operations finished successfully in all of the eyes under the topical anesthesia. The operation duration ranged from 20 to 25 minutes with average of 22 minutes. The patients cooperated with the doctor well without any discomfort. Two days after the surgery, edema of the wounded conjunctiva was found, and recovered 7 days later. A light pigment dot on the surface of the sclera could be seen at the first month. The complic ations included transient increasing of intraocular pressure in 2 eyes, feather-like opacity of lens in 5 eyes, vitreous hemorrhage in 1 eye, and air-bleb under conjunctiva in 2 eyes. No other complications related with the cut were fo und. The macular hole closed in 9 eyes with idiopathic macular hole, and the other 1 had the smaller but not closed hole. Idiopathic macular pucker, vitreoretinal traction syndrome, and vitreous hemorrhage associated with branch retinal vein occlusion were cured successfully. Conclusions Vitreoretinal surgery using the TSV25G under the topical anesthesia has many advantages such as simple procedure, short operation time, micro-invasion, less complications and rapid revovery, and mainly serves simple manipulation in some simple diseases such as idiopathic macular hole, vitreo-retinal traction syndrome, and simple hemorrhage. (Chin J Ocul Fundus Dis，2004，20：133-136)
Objective To study the cl inical features of infantile hemangioma and vascular malformation, to find out a proper strategy of deal ing with them. Methods From March 2000 to August 2007, 2 957 cases of infantile hemangioma and vascular malformation were treated, including 860 operative cases and 2 097 non-operative cases. There were 441 male and419 female patients in operation group, aging 6 months to 18 years (median 5 years). In 1 950 hemangioma patients of nonoperation group, there were 575 male and 1 375 female patients, aging 1 month to 14 years (median 6 months); in 147 vascular malformation patients of non-operation group, there 67 male and 80 female patients, aging 2 years to 17 years (median 7 years). In non-operative group, 147 vascular malformation patients and 1 525 infantile hemangioma patients were followed up without any medical intervention, while other 425 hemangioma patients recceived triamcinolone plus dexamethasone intralesional injection treatment. All the treatments and outcomes were recorded. Results Vascular malformation cases and infantile hemangioma cases presented totally different cl inical features. To the deadl ine of this study, 522 (34%) of 1 525 un-intervented hemangioma cases turned into involuted phase and 383 (90%) of 425 cases receiving triamcinolone plus dexamethasone intralesional injection treatment turned into involuted phase after injection treatment; no regression was noted in 147 cases of vascular malformation. The constituent ratio of infantile hemangioma in 860 operative cases was decreased gradually and the constituent ratio of vascular malformation was increased gradually as the age increasing. Conclusion Infantile hemangioma has a distinct l ife pattern. Except several specific cases need medical intervention for their special location or large ambit and unacceptable growth, most infantile hemangioma need no medical intervention. Most vascular malformations can not regress spontaneously, proper intervention is in need.
背景与目的 对卫生保健干预措施进行决策权衡需要有不良和有益的可靠证据,然而绝大多数系统评价针对的是研究方法非常成熟的随机对照试验及其有效性评价,系统地评价不良反应的方法尚未完善,对研究者而言,能作为相关指南的资源很少.为此,作者在文中报告了对不良反应进行系统评价的新近体会,同时提出进一步实践和研究的建议.方法 描述并比较3个包含不良反应评价的药物干预的系统评价的方法学,重点评价其研究问题、研究设计和质量评价.结果 1个研究关注于如何根据提供的特殊不良反应数据建立卫生经济学模式,而其它两个研究涉及更广泛的问题.尽管每个评价对纳入标准的定义不同,但它们均纳入了随机和观察性数据.对研究质量的评价采用了标准方法.由于研究设计不良、报告不充分和现有研究工具有限,在运用纳入标准和评估研究质量时,研究者遇到了各种问题.最终发现,3个评价都做了大量的工作,但对卫生保健决策者有用的资料不多.研究者确认,改善的关键在于如何提出系统评价的问题和发展不良反应研究的质量评价方法学.结论 若不良反应的系统评价只专注于一个中心问题,那么它会提供与临床决策更相关的资料,也有利于明确纳入系统评价研究的类型.系统评价中不良反应的质量评估的方法学需要进一步完善.
目的 总结Lilly氏法切除先天性胆总管囊肿的经验。方法 对1980年以来我院收治的20例采用Lilly氏法保留胆总管囊肿后壁外层切除先天性胆总管囊肿的技术要点及手术疗效进行了回顾性分析。结果 该术式操作方便，术后随访表明，它可有效地解除胆管囊肿的主要症状，无严重手术并发症及不良后果。结论 该术式安全简便，疗效满意，在Ⅰ型先天性胆总管囊肿炎性粘连较重时可适当选用。
Objective To evaluate the quality of Chinese literatures on the methodology of D-dimer diagnostic test. Method We searched CNKI (1994 to 2006) and CBM (1978 to 2006) for articles involving the diagnostic tests of D-dimer for coagulation disorders. Result A total of 63 relevant articles were retrieved and 7 were included in our review. Only one of these provided useful data on two two table for the evaluation of diagnostic accuracy. Conclusions Few studies on the diagnostic tests of D-dimer have been performed and publ ished in China, all of poor quality. Further studies should focus on clinical diagnostic sensitivity and specificity, so as to provide more valuable information for readers.
ObjectiveTo observe the effects of human umbilical cord mesenchymal stem cells (hUCMSCs) on blood glucose levels and diabetic retinopathy in diabetes mellitus (DM) rats. MethodA total of 45 healthy male Sprague-Dawley rats were randomly divided into normal control group (group A, 10 rats) and DM group (33 rats). Diabetic model was established in DM group by tail vein injection of streptozotocin.The DM group was further randomly divided into 3 groups (11 rats in each group), including group B (no transplantation), group C (hUCMSC was injected through tail vein) and group D (hUCMSC was injected into the vitreous). Blood glucose, retina wholemont staining and expression of brain derived neurotrophic factor (BDNF) in the retina were measured at 2, 4, 6, 8 weeks after hUCMSC injection. The blood glucose was significantly different between A-D groups before injection (t=-64.400, -60.601, -44.065, -43.872; P=0.000) BDNF expression was studied by real time fluorescence quantitative polymerase chain reaction (RT-PCR) and immunohistochemistry staining. ResultsThe blood glucose was significantly different between A-D groups after hUCMSC injection (F=400.017, 404.410, 422.043, 344.109; P=0.000), and between group C and group B/D (t=4.447, 4.990; P < 0.01). Immuno-staining shown that BDNF was positive in ganglion cell layer (RGC) of group A, weak in group B while BDNF expression increased in group C/D. BDNF mRNA expression was significantly different between group B, C and D at 4, 6 and 8 weeks after hUCMSC injection (F=29.372, 188.492, 421.537; P=0.000), and between group B and C/D (t=66.781, 72.401, 63.880, 88.423, 75.120, 83.002; P < 0.01) by RT-PCR analysis. The BDNF mRNA expression was significantly different between C and D groups only at 8 weeks after hUCMSC injection (t=127.321, P=0.005). ConclusionsTail vein injection of hUCMSCs can significantly reduce the blood glucose levels of rats. Intravenous and intravitreal injection of hUCMSCs can increase the expression of BDNF.
Mitral stenosis includes mitral stenosis due to rheumatic fever and non-rheumatic valve stenosis characterized by degenerative changes. Rheumatic mitral stenosis is common in developing countries and occurs in young adults, while degenerative mitral stenosis is common in developed countries and increases in incidence with aging. Mitral stenosis of different etiologies can lead to changes in heart structure and function, which affects the quality of life and prognosis of patients, so lifelong management of mitral stenosis is crucial. This article provides a comprehensive reference for clinicians in the management of mitral stenosis, with a detailed overview of the emerging prevalence features, imaging diagnosis, and treatment methods.