辽宁猪巨吻棘头虫泄殖器官及吻腺的扫描电镜观察

本文作者继1986年用扫描电镜研究猪巨吻棘头虫 Macracanthorhynchus hirudinaceu(Pallas,1781;Travassos,1916)的成虫、童虫、棘头体和虫卵之后,又对其成虫体内的吻腺、原肾球、子宫钟、睾丸、粘液腺和交合伞等形态结构进行了研究,初步结果介绍于下: 材料和方法 猪巨吻棘头虫成功收集于沈阳市肉食品加工厂屠宰车间,从猪小肠肉取出新鲜活虫体,经生理盐水充分洗涤干净,用锋利解剖刀剖开虫体,取得标本按常规方法制备扫描样品。

福建海鱼寄生的棘吻类的棘头虫记述

棘头虫是为害经济动物较严重的一门动物,种类不多,全球已知仅有一千多种,其中多数寄生鱼类,约有600多种,占虫种总数一半以上。我国棘头虫门动物已知有135种,其中寄生于鱼类的84种,约占我国种类的三分之二。福建省已知棘头虫有88种,寄生于鱼类的只有32种,尚未达三分之一。福建是沿海地区,水域广大,水产养殖业发达,鱼类资源丰富,推知尚有很多的棘头虫尚未发现,需要继续进行调查研究。棘吻类 Echinorhynchoidca(Cobbold,1876)是棘头虫门中较大的一类寄生虫。

Pancreatic fistula after pancreatectomy:Evolving definitions,preventive strategies and modern management

Pancreatic resection is the treatment of choice for pancreatic malignancy and certain benign pancreatic disorders. However, pancreatic resection is technically a demanding procedure and whereas mortality after a pancreaticoduodenectomy is currently < 3%-5% in experienced high-volume centers, post-operative morbidity is considerable, about 30%-50%. At present, the single most significant cause of morbidity and mortality after pancreatectomy is the development of pancreatic leakage and fistula (PF). The occurrence of a PF increases the length of hospital stay and the cost of treatment, requires additional investigations and procedures, and can result in life-threatening complications. There is no universally accepted definition of PF that would allow standardized reporting and proper comparison of outcomes between different centers. However, early recognition of a PF and prompt institution of appropriate treatment is critical to the prevention of potentially devastating consequences. The present article, reviews the evolution of post resection pancreatic fistula as a concept, and discusses evolving definitions, the current preventive strategies and the management of this problem.

Pancreatic fistula after pancreaticoduodenectomy:A comparison between the two pancreaticojejunostomy methods for approximating the pancreatic parenchyma to the jejunal seromuscular layer:Interrupted vs continuous stitches

AIM： The purpose of this study is to find a better operative technique by comparing interrupted stitches with continuous stitches for the outer layer of the pancreaticojejunostomy, i.e. the stitches between the stump parenchyma of the pancreas and the jejunal seromuscular layer, and other risk factors for the incidence of pancreatic leakage.METHODS： During the period January 1997 to October 2004, 133 patients have undergone the end-to-side and duct-to-mucosa pancreaticojejunostomy reconstruction after pancreaticoduodenectomy with interrupted suture for outer layer of the pancreaticojejunostomy and 170 patients with a continuous suture at our institution by one surgeon.RESULTS： There were no significant differences between the two groups in the diagnosis, texture of the pancreas, use of octreotide and pathologic stage. Pancreatic fistula occurred in 14 patients （11%） among the interrupted suture cases and in 10 （6%） among the continuous suture cases （P = 0.102）. Major pancreatic leakage developed in three interrupted suture patients （2%） and zero continuous suture patients （P = 0.026）. In multivariate analysis, soft pancreatic consistency （odds ratio, 5.5; 95% confidence interval 2.3-13.1） and common bile duct cancer （odds ratio, 3.7; 95%CI 1.6-8.5） were＇predictive of pancreatic leakage.CONCLUSION： Pancreatic texture and pathology are the most important factors in determining the fate of pancreaticojejunal anastomosis and our continuous suture method was performed with significantly decreased occurrence of major pancreatic fistula. In conclusion, the continuous suture method is more feasible and safer in performing duct-to-mucosa pancreaticojejunostomy.

Experimental study on operative methods of pancreaticojejunostomy with reference to anastomotic patency and postoperative pancreatic exocrine function

AIM:To assess the patency of pancreaticoenterostomy and pancreatic exocrine function after three surgical methods. METHODS: A pig model of pancreatic ductal dilation was made by ligating the main pancreatic duct. After 4 wk ligation, a total of 36 piglets were divided randomly into four groups. The piglets in the control group underwent laparotomy only; the others were treated by three anastomoses: (1) end-to-end pancreaticojejunostomy invagination (EEPJ); (2) end-to-side duct-to- mucosa sutured anastomosis (ESPJ); or (3) binding pancreaticojejunostomy (BPJ). Anastomotic patency was assessed after 8 wk by body weight gain, intrapancreatic ductal pressure, pancreatic exocrine function secretin test, pancreatography, and macroscopic and histologic features of the anastomotic site. RESULTS: The EEPJ group had significantly slower weight gain than the ESPJ and BPJ groups on postoperative weeks 6 and 8 (P < 0.05). The animals in both the ESPJ and BPJ groups had a similar body weight gain.Intrapancreatic ductal pressure was similar in ESPJ and BPJ. However, pressure in EEPJ was significantly higher than that in ESPJ and BPJ (P < 0.05). All three functional parameters, the secretory volume, the flow rate of pancreatic juice, and bicarbonate concentration, were significantly higher in ESPJ and BPJ as compared to EEPJ (P < 0.05). However, the three parameters were similar in ESPJ and BPJ. Pancreatography performed after EEPJ revealed dilation and meandering of the main pancreatic duct, and the anastomotic site exhibited a variable degree of occlusion, and even blockage. Pancreatography of ESPJ and BPJ, however, showed normal ductal patency. Histopathology showed that the intestinal mucosa had fused with that of the pancreatic duct, with a gradual and continuous change from one to the other. For EEPJ, the portion of the pancreatic stump protruding into the jejunal lumen was largely replaced by cicatricial fibrous tissue. CONCLUSION: A mucosa-to-mucosa pancreatico- jejunostomy is the best choice for anastomotic patency when compared with EEPJ. BPJ can effectively maintain anastomotic patency and preserve pancreatic exocrine function as well as ESPJ.

Polypropylene mesh-reinforced pancreaticojejunostomy for periampullar neoplasm

AIM： To evaluate the effect of polypropylene mesh- reinforced pancreatojejunostomy on pancreatic leakage. METHODS： Seventeen consecutive patients with paraampullar malignancy received polyprolene meshreinforced pancreatodudeonectomy and the Child＇s method was used to rebuild the alimentary tract. RESULTS： The mean time of polyprolene mesh-reinforced pancreatojejunostomy was 22 rain. Anastomosis could endure 30-500 cm H20 pressure during operation. All patients recovered without pancreatic leakage. CONCLUSION： Polyprolene mesh-reinforced pancreatojejunostomy is a feasible and reliable procedure to prevent pancreatic leakage.

Endoscopic ultrasound-guided choledochoduodenostomies with fully covered self-expandable metallic stents

AIM:To investigate the long-term outcomes of endoscopic ultrasound-guided choledochoduodenostomy(EUS-CDS) with a fully covered self-expandable metallic stent(FCSEMS).METHODS:From April 2009 to August 2010,15 patients with distal malignant biliary obstructions who were candidates for alternative techniques for biliary decompression due to a failed endoscopic retrograde cholangiopancreatography(ERCP) were included.These 15 patients consisted of 8 men and 7 women and had a median age of 61 years(range:30-91 years).The underlying causes of the distal malignant biliary obstruction were pancreatic cancer(n = 9),ampulla of Vater cancer(n = 2),renal cell carcinoma(n = 1),advanced gastric cancer(n = 1),lymphoma(n = 1),and duodenal cancer(n = 1).RESULTS:The technical success rate of EUS-CDS with an FCSEMS was 86.7%(13/15),and functional success was achieved in 100%(13/13) of those cases.In two patients,the EUS-CDS failed because an FCSEMS with a delivery device could not be passed into the common bile duct.The mean duration of stent patency was 264 d.Early adverse events developed in three patients(3/13,23.1%),including self-limited pneumoperitoneum in two patients and cholangitis requiring stent reposition in one patient.During the follow-up period(median:186 d,range:52-388 d),distal stent migration occurred in four patients(4/13,30.8%).In 3 patients,the FCSEMS could be reinserted through the existing choledochoduodenal fistula tract.CONCLUSION:EUS-CDS with an FCSEMS is technically feasible and can lead to effective palliation of distal malignant biliary obstructions after failed ERCP.

Conservative resection for benign tumors of the proximal pancreas

AIM:To evaluate the safety and long-term prognosis of conservative resection (CR) for benign or borderline tumor of the proximal pancreas.METHODS: We retrospectively analyzed 20 patients who underwent CR at the Second Affi liated Hospital of Zhejiang University School of Medicine between April 2000 and October 2008. For pancreaticojejunostomy, a modified invagination method, continuous circular invaginated pancreaticojejunostomy (CCI-PJ) was used. Modified continuous closed lavage (MCCL) was performed for patients with pancreatic fistula.RESULTS: The indications were: serous cystadenomas in eight patients, insulinomas in six, non-functional islet cell tumors in three and solid pseudopapillary tumors in three. Perioperative mortality was zero and morbidity was 25%. Overall, pancreatic fistula was present in 25% of patients. At a mean follow up of 42.7 mo, all patients were alive with no recurrence and no new-onset diabetes mellitus or exocrine dysfunction.CONCLUSION: CR is a safe and effective procedure for patients with benign tumors in the proximal pancreas, with careful CCI-PJ and postoperative MCCL.

Therapeutic effects of two anastomoses of lacrimal passage on canalicular laceration

Objective： To evaluate the therapeutic effects of two anastomoses （canaliculus-to-lacrimal sac anastomosis and end-to-end anastomosis） on nasolacrimal laceration for over 7 mm from the broken end to the dacryon. Methods： A total of 71 patients （44 males and 27 females, aged 16-55 years, mean=34.32 years） with fresh canalicular laceration were treated in our hospital from March 2003 to April 2008. Under a microscope, 37 patients were treated with lacrimal sac anastomosis （the treatment group） and 34 with end-to-end anastomosis （the control group）, detaining silicone tubes till 3 months later. Results： The cure rate of the treatment group （89.19%） was significantly higher than that of the control group （55.56%）. Class I cure rates were 70.27% in the treatment group and 47.06 % in the control group, and the difference between the two groups was significant （P〈0.05）. Postoperative inflammatory reactions had significant influences on the two kinds of anastomosing methods, but no significant difference was found between the two groups （P〉0.05）. Conclusions： When the distance from the broken end to the dacryon is over 7 mm, especially when it is necessary to find the paranasal broken end of the lacrimal canaliculus with dacryocystotomy, canaliculus-to-lacrimal sac anastomosis is a better treatment method than end-to-end anastomosis for laceration of lacrimal canaliculus.