Time-dependent RNA synthesis in different skin layers after wounding. Experimental investigations in vital and postmortem biopsies

Summary Incision wounds were made on the outer ear of rats and two biopsies were taken for examination after different survival times. In each case a biopsy was made of vital tissue and a second of postmortem tissue after refrigeration for 24 h. The biopsies were exposed to a solution containing the RNA precursor³H-cytidine for 1 h, washed and fixed in formalin. Sections 5 m thick were then autoradiographically prepared and automatically evaluated using Quantimet 920. The intravital specimens showed a significant increase in³H-cytidine incorporation in the basal cell layer after survival times of 10–24 h. No increase was seen in the stratum corneum, corium or cartilage tissue. The investigated distance from the wound margin did not have any significant bearing on the results. The³H-cytidine incorporation rate in postmortem tissue was practically identical with that of vital tissue, but no increase was observed in the rate of RNA synthesis in the basal cells as a function of the age of the wound. It may therefore be assumed that this method provides no additional information as to the age of wounds in postmortem examination.Dedicated to Professor O. Pribilla on the occasion of his 70th birthday     

38例晚期产后出血的临床分析

目的:探讨引起晚期产后出血的临床原因。方法:对1998年-2002年间收治产后出血发生晚期出血的38例资料进行回顾性分析。结果:38例中在基层乡镇医院分娩者占68.4％,在市级医院分娩者占31.6％。结论:晚期产后出血的主要原因是胎盘胎膜残留和子宫切口愈合不良。     

Comparison of Radiographic and pQCT Analyses of Healing Rat Tibial Fractures

Fracture healing and callus formation have traditionally been evaluated by using X-ray radiography. Here we compared X-ray radiography and peripheral quantitative computed tomography (pQCT) in evaluating the healing callus of standardized tibial fractures in 141 female rats after a 4- or 8-week follow-up. The results were compared with the tensile (4-week) and compressive (8-week) failure load of the callus. The projectional size of callus, as defined from lateral ex vivo radiographs, correlated significantly with the pQCT-defined cross-sectional area (CSA) of mid-callus. This relationship was dependent on the pQCT attenuation threshold, being higher for the CSA of compact bone (r = 0.85, P < 0.0001) than for the total bone CSA (r = 0.68, P < 0.0001). Radiographically defined callus projectional area also correlated strongly with bone mineral content (BMC) (r = 0.84–0.86, P < 0.0001). The mean optical density of the callus analyzed from the radiographs had only a weak correlation with the pQCT-defined bone mineral density (BMD) of callus. A weak negative relationship was found between CSA and BMD. The optical density analyzed from lateral radiographs did not correlate with the tensile or compressive failure load of callus. Callus size, BMC, and BMD were associated with the compressive failure load, whereas both radiographs and pQCT were poor in explaining the failure load in tension. Received: 28 June 1999 / Accepted: 28 October 1999     

Effect of electrolyzed water on wound healing

Electrolyzed water accelerated the healing of full-thickness cutaneous wounds in rats, but only anode chamber water (acid pH or neutralized) was effective. Hypochlorous acid (HOCl), also produced by electrolysis, was ineffective, suggesting that these types of electrolyzed water enhance wound healing by a mechanism unrelated to the well-known antibacterial action of HOCl. One possibility is that reactive oxygen species, shown to be electron spin resonance spectra present in anode chamber water, might trigger early wound healing through fibroblast migration and proliferation.     

颊脂垫瓣在口腔黏膜癌术后缺损修复中的应用

目的研究颊脂垫瓣在口腔恶性肿瘤切除后组织缺损修复中的应用效果。方法总结15例应用颊脂垫瓣修复口腔恶性肿瘤切除后组织缺损临床资料，观察颊脂垫瓣的愈合过程及修复效果。结果所有患者颊脂垫瓣成活愈合良好，术后1周颊脂垫瓣明显水肿，组织瓣表面有薄层伪膜覆盖，1周后伪膜逐渐消失，2周后伪膜完全消失，2～3周后水肿明显消退，颊脂垫表面逐渐上皮化，2～3个月再生的粘膜变得光滑，呈粉红色，与正常口腔粘膜类似。结论颊脂垫瓣为修复口腔恶性肿瘤缺损提供了一种良好的手段，值得临床推广。     

人纤维蛋白胶对供皮区创面的疗效观察

目的:探讨局部应用人纤维蛋白胶(FS)对中厚供皮区创面的止血和修复作用。方法:选择30例90个中厚供皮区创面为研究对象,分FS止血组、自然止血组以及凝血酶止血组,均选择自体相应部位及相似深度创面进行对照。分别观察各组间创面的止血时间和术后创面完全愈合时间。结果:FS止血组的平均止血时间比自然止血组与凝血酶止血组分别缩短36秒和13秒(P<0.01);创面完全愈合时间,FS止血组为(12.10±2.32)天,自然止血组和凝血酶止血组分别为(19.80±3.86)天和(19.20±3.65)天,FS止血组明显提前(P<0.01)。结论:FS对中厚供皮区创面有明显的止血作用,并能促进创面提前愈合和预防创面感染。     

针刺取穴与骨折愈合疗效关系初探

目的:初步探讨针刺取穴与骨折愈合疗效的关系,为临床研究和应用提供参考,方法选用48只体重2.0～2.5 kg的雄性纯种大耳白家兔,手术造成新鲜桡骨骨折模型,用区组随机法分为局部和邻近取穴组(A组)、远道和辨证取穴组(B组)、局部和邻近取穴加远道和辨证取穴组(C组)、空白对照组(D组)共四组,术后第一天开始对治疗组分别做电针治疗,于术后7 d、14 d、28 d取材做血液生化学、生物力学、放射学、组织学的观测.比较各组间上述指标的差别.结果:血清碱性磷酸酶含量14 d时A组和C组明显高于B组和D组(P＜0.01),骨折标本抗弯强度在28 d时A组和C组明显高于B组和D组(P＜0.01),X线量化评分14 d和28d时A组和C组明显高于B组和D组(P＜0.05),在各个时段各个指标A组与C组、B组与D组比较均无显著差异(P>0.05).结论:局部和邻近取穴能明显促进骨折愈合,而且具有操作简便,易于推广等优点,远道和辨证取穴则效果不明显,与前者合用也没有明显增强前者的疗效.     

肝细胞生长因子对视网膜色素上皮细胞增生及损伤愈合的影响

目的 研究肝细胞生长因子(hepatocyte growth factor，HGF)对培养的人视网膜色素上皮(retinal pigmental epithelial，RPE)细胞增生和损伤愈合的影响。方法 MTT比色法检测细胞增生情况，相差显微和细胞计数法观察RPE细胞损伤后的愈合情况。结果 中等浓度HGF(10ng／ml)刺激RPE细胞的增生较低浓度组(0．01～1ng／m1)明显增多(P＜0．05)，而与高浓度(100ng／ml)组比较无统计学差异(P＞0．05)。随着HGF刺激时间的延长，迁移的细胞数量增多，同一时间点，HGF处理组明显比对照组细胞数量多(P＜0．05)。结论 中等浓度的HGF可促进细胞增生，对损伤后的RPE细胞有迁移作用。     

剖宫产术后子宫切口愈合不良56例临床分析

目的探讨剖宫产术后子宫切口愈合不良的发病原因,治疗及预防。方法对56例剖宫产术后子宫切口愈后不良的病例进行回顾性分析。结果围手术期感染,术前存在基础疾病,产程异常,手术的操作是影响切口愈合的主要因素。结论剖宫产术后可以利用B超声像早期诊断和有效治疗子宫切口愈合不良。     

瘢痕治疗现状

伤口愈合后瘢痕的形成与增生,一直困扰着人们,是整形美容外科急需解决的难题.增生性瘢痕或瘢痕疙瘩在临床上较常见,发病率越来越高,其产生的内因,形成的机理尚不完全清楚,目前比较一致的看法是瘢痕组织内成纤维细胞增多和胶原纤维沉积,但缺乏有效、可靠的治疗方法,未从根本上解决防治瘢痕的问题.现对瘢痕的治疗现状作一综述.