血管内皮生长因子基因支架预防球囊扩张术后再狭窄的实验研究

近年研究表明,内膜增厚致再狭窄的始动因素是内皮细胞的损伤。我们利用血管内皮生长因子(VEGF)可以促进损伤内膜内皮化这一特性,将携带VEGF基因的多聚赖氨酸涂层支架置人球囊扩张术后的动脉粥样硬化兔腹主动脉,旨在评估在质粒介导下,由该涂层支架向血管内局部转基因的可行性及VEGF修复内膜、抑制再狭窄的效果。     

拇手指部分缺损的修饰性修复与重建

目的评估对拇、手指末节部分缺损,选用相应部分足趾组织移植修饰性修复与重建的临床效果,提出修饰性修复与重建的新理念。方法对77例80指拇、手指末节半侧、背侧、指腹及手指部分复合组织缺损选用足趾末节半侧甲瓣,背侧甲瓣,趾腹皮瓣及足趾相应部分复合组织移植,采用吻合趾．指动静脉重建血液循环,施行修饰性修复与重建。结果成活75例78指,成活率为97．5％,术后经半年至12年随访,保持了手指原来长度与外形,重建了指甲,使指腹饱满,具有罗纹,出汗,两点分瓣觉为4～6mm,获得较完美的外形与功能。结论对拇、手指末节部分复合组织缺损,选用相应部分足趾半侧甲瓣、背侧甲瓣、趾腹皮瓣及复合组织移植的修饰性修复与重建,可达到精细修复效果和修饰性修复与重建的目的。     

胃黏膜保护与胃动力

胃黏膜的完整和胃肠动力的正常是维持胃生理功能的两个基本条件。其中,胃黏膜的完整对于维持胃肠道功能包括胃动力是必不可少的,而胃动力的正常则有利于清除有害物质,维持局部微环境的平衡,从而对胃黏膜产生保护作用。已有许多研究表明黏膜损伤和动力失调在多种胃肠疾病发病中都发挥着重要作用,并且两者相互关联、相互影响共同作用。     

人血小板功能抗体及其片段的识别

目的研究特发性血小板减少性紫癜（ITP）患者血小板膜糖蛋白（GP）特异性IgG抗体及其片段的免疫活性及对血小板聚集功能的影响.方法用改良单克隆抗体特异性俘获血小板抗原技术（MAIPA）检测84例慢性ITP患者血浆中抗GPⅡb/Ⅲa、GPⅠb/Ⅸ及GPⅥ自身抗体,比浊法血小板聚集试验筛选出自身抗体阳性并能抑制血小板聚集的患者,用蛋白A柱纯化其血浆IgG抗体并用胃蛋白酶制备F（ab＇）2片段.检测纯化的IgG抗体及其酶切片段与血小板GP的结合活性及对正常人血小板聚集功能的影响.结果 （1）84例ITP患者血浆中,48例（57.1%）抗GPⅡb/Ⅲa和/或GPⅠb/Ⅸ和/或GPⅥ自身抗体阳性,其中7例（14.6%）明显抑制了二磷酸腺苷、瑞斯托霉素或胶原诱导的血小板聚集;（2）纯化的IgG及F（ab＇）2片段具有与相应血小板GP的结合活性;（3）4例患者纯化IgG及F（ab＇）2片段具有抑制血小板聚集的功能.结论 F（ab＇）2片段是IgG自身抗体的功能片段,它不但保留了良好的抗原结合活性且可部分抑制血小板聚集功能,为人源化血小板糖蛋白特异性抗体的制备奠定了基础.     

Tamoxifen use in patients with ductal carcinoma in situ and T1a/b N0 invasive carcinoma

BACKGROUND: The purpose of this study was to determine how often patients with ductal carcinoma in situ and T1a/b N0 cancer are offered and accept tamoxifen for secondary chemoprevention. STUDY DESIGN: A retrospective review of 284 patients with T1a/b N0 invasive cancer treated between February 1995 and December 2001 and 129 patients with DCIS treated after September 1998 was carried out. Patient and tumor characteristics associated with being offered and accepting tamoxifen were compared. RESULTS: Tamoxifen was offered to 67% of the invasive cancer patients and accepted by 76% (51% of the entire group). Hormone receptor status was the only significant predictor of being offered tamoxifen (p = 0.004). Older age (p = 0.04), Caucasian race (p = 0.01), and parity (p = 0.04) in premenopausal women were significant predictors of tamoxifen acceptance on univariate analysis. After the publication of the National Surgical Adjuvant Breast and Bowel Project P-1 trial, significantly more patients were offered tamoxifen (p = 0.02), but acceptance rates did not change. Tamoxifen was offered to 91% of the ductal carcinoma in situ patients and accepted by 73% (67% overall). Lumpectomy was associated with significantly higher rates of being offered (p = 0.02) and accepting tamoxifen (p = 0.002) on univariate analysis. CONCLUSIONS: Factors associated with tamoxifen risks and benefits correlate poorly with the use of the drug.     

Stanford A型主动脉夹层的外科治疗

目的总结A型主动脉夹层的外科治疗经验。方法回顾分析手术治疗68例StanfordA型主动脉夹层患者的临床资料。其中急性主动脉夹层45例,慢性主动脉夹层23例。采用中低温体外循环53例,深低温停循环(DHCA)和上腔静脉逆行灌注脑保护11例,DHCA加选择性脑灌注4例。急诊手术39例(其中紧急手术19例),择期手术29例。术式为升主动脉置换术7例,升主动脉加右半弓置换术6例,升主动脉加全弓置换术3例,升主动脉加全弓置换加术中支架置入术4例,Bentall手术34例,改良的Wheat术12例,同时行主动脉瓣成形术2例、二尖瓣成形1例。结果全组死亡5例(7%),其中急诊手术3例,急诊手术病死率8%(3/39);择期手术2例,择期手术病死率7%(2/29)。共随访58例,随访率92%(58/63),随访时间(37±22)个月(5~77个月),死亡4例,累积1,3和5年的生存率分别是100%,95%和86%。结论StanfordA型夹层的手术方式应根据内膜破口位置决定,正确的手术指征、技巧和脑保护是手术成功的关键。     

带血管蒂髂骨瓣移植修复下肢骨及其周围软组织缺损

目的探讨带血管蒂髂骨瓣移植在修复下肢骨及其周围软组织缺损中的作用。方法针对小腿、足解剖结构和伤后骨与软组织易缺损的特点,利用游离髂骨移植必须携带周围肌肉,设计带血管蒂的髂骨肌肉瓣,移植修复下肢骨及软组织缺损;髂骨肌肉瓣血管与受区血管吻合后于骨瓣周围肌肉表面皮片覆盖。结果手术后1周,移植皮片全部植在髂骨周围的肌肉表面,皮片成活间接证明移植骨瓣成活;皮片全部成活4例,大部分成活3例;术后1个月均可见髂骨瓣与受区断端间有少量的骨痂形成,修复足跖骨4个月后拔除克氏针,胫骨6～8个月拆除外固定架,扶拐行走2～4个月：术后随访经6～15个月(平均10个月),双下肢等长,无溃疡,行走负重良好,外形及功能满意。结论单纯髂骨游离移植修复骨及软组织缺损一次完成手术操作,解剖塑形及外观比传统术式更满意,是修复小腿及足外伤软组织和骨缺损的较好术式。     

Effects of arginine-containing total parenteral nutrition on N balance and phagocytic activity in rats undergoing a partial gastrectomy

The present study investigated the effect of arginine (Arg)-containing parenteral nutrition on phagocytic activity to elucidate the possible roles of Arg in the secretion of anabolic hormones and N balance in rats undergoing gastrectomy. Rats were divided into two experimental groups and received total parenteral nutrition (TPN). The TPN solutions were isonitrogenous and identical in nutrient compositions except for differences in amino acid content. One group received conventional TPN, the other group replaced 2 % of the total energy as Arg. After receiving TPN for 3 d, one-third of the rats in each experimental group were killed as the baseline group. The remaining rats underwent a partial gastrectomy and were killed 1 or 3 d after surgery. The results showed that there were no differences in N balance, plasma growth hormone and insulin-like growth factor-1 levels between the two groups before or after surgery. The phagocytic activity of peritoneal macrophages was higher in the Arg group than in the control group 1 d after surgery. There were no differences in the phagocytic activities of blood polymorphonuclear neutrophils between the two groups at various time points. TNF-alpha levels in peritoneal lavage fluid were lower in the Arg group than in the control group on post-operative day 3. These results suggest that parenterally infused Arg enhances phagocytic activity and reduces the production of inflammatory mediators at the site of injury. However, Arg supplementation did not influence the secretion of anabolic hormones nor N balance in rats with a partial gastrectomy.     

Hospital-based allogenic bone bank--10-year experience

Bone banking in a hospital provides resources of allogenic bone grafts. However, they may transmit infection from donor to recipient. We found few reports discussing the infection rate and monitoring processes associated with bone banks. The discard rate using the screening test was 18.5% (309/1674) in this series. The leading cause was hepatitis B antigen (HBsAg) positive donor serum (67%), followed by Venereal Disease Research Laboratory (VDRL) positive donor serum (15%), and anti-hepatitis C virus (HCV) positive donor serum (12%). The overall infection rate in the recipients was 1.3% (17/1365). Among 1353 implanted allografts, 22 cases (1.6%) had a positive swab culture result after thawing. Only four out of these 22 cases (18.2%) developed infection. However, the wound cultures of the infected recipients were different from the swab culture of thawing allografts except in one case. Among the 1331 recipients with sterile allograft bones, 13 (1%) were found to have infection. In conclusion, our bone bank operates under a strict monitoring system which results in a low infection rate. The recipient's status, the aseptic technique and environment during operation is likely to be more critical in prevention of allograft-related infection.     

Sutural distraction osteogenesis (SDO) versus osteotomy distraction osteogenesis (ODO) for midfacial advancement: a new technique and primary clinical report

A new technique of osteotomy distraction osteogenesis (ODO) and sutural distraction osteogenesis (SDO) by the use of bone-borne traction hooks is presented. The technique of osteotomy plus distraction osteogenesis is suitable for adult patients. The technique of sutural distraction osteogenesis is suitable for young patients, ages 6 through 12 years. The distraction system consists of a face-bow, orthodontic elastics, and bone-borne traction hooks. The bone-borne traction hooks are made of titanium, with two traction hooks running laterally or downwardly. When a Le Fort III osteotomy is needed, bone-borne traction hooks are inserted through the nostrils into a bone hole drilled at the lateral-inferior pyriform aperture. When no osteotomy is needed, only the bone-borne traction hooks are placed. Heavy elastics were used in the technique of osteotomy distraction osteogenesis for Le Fort III osteotomy adult patients, whereas light forces and thus light elastics were used for younger patients. Three adult patients and four children were treated by osteotomy distraction and sutural distraction, respectively. All seven patients with midfacial hypoplasia established a harmonious facial profile and normal occlusal relationships. Radiographic examination showed balanced advancement of the midfacial skeleton. It is suggested that the treatment of midfacial hypoplasia in children by the technique of sutural distraction osteogenesis is to be preferred because of its simplicity and relative noninvasiveness. Thus, the authors suggest that midfacial hypoplasia should be treated at a younger age by this technique, potentially eliminating the need for a Le Fort III osteotomy at an older age.