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1.
目的观察镍钛合金组合式人工食管替代食管术后,新生食管的形成及重构。方法22只猪通过手术切除一段长约7 cm的胸段食管,应用镍钛合金组合式人工食管替代切除的胸段食管建立实验动物模型。对置入人工食管术后1、2、3、6个月各时段出现植入人工食管脱落移位的12只实验动物,进行X线食管造影,然后剖杀,对比观察各时段形成的新生食管的大体形态,镜下管体组织细胞结构的变化。结果12只实验动物中6只早期脱管(术后1个月内),3只并发吻合口瘘和脓胸,另3只则出现严重吻合口狭窄;余6只脱管时间超过1个月,未发生吻合口瘘和胸腔感染,仅出现不同程度的新生食管狭窄和进食困难。镍钛合金组合式人工食管替代食管术后1个月,人工食管外壁形成一条以结缔组织膜包绕,连接正常食管两端的管道。2~3个月的新生食管管体结构,除中间狭窄部分为结缔组织外,已形成与正常食管4层组织结构相似的纤维肌性管道。3~6个月新生食管管体组织结构呈现肉芽组织增生、瘢痕组织形成的重构过程。全程未发现腺体组织。结论镍钛合金组合式人工食管作为修复材料重建食管通道置入人体后,诱导出由结缔组织包绕人工食管外壁的管道,新生食管在随后的重构过程中发生肉芽组织增生,瘢痕组织形成的转化过程,最终形成一条没有收缩功能、黏膜面覆盖复层鳞状上皮的瘢痕性管道。  相似文献   

2.
结肠或胃重建食管治疗食管烧伤后瘢痕狭窄100例   总被引:2,自引:0,他引:2  
目的 总结结肠或胃重建食管治疗食管烧伤后瘢痕狭窄的临床经验及疗效。方法回顾分析100例应用结肠或胃重建食管烧伤后食管瘢痕狭窄的临床资料。74例未切除瘢痕段食管,结肠经胸骨后隧道上提至颈部或咽部吻合;26例经胸切除瘢痕段食管,行食管胃胸内吻合23例,颈部吻合3例。结果结肠重建食管死亡5例(6.8%),术后发生颈部吻合口瘘14例(18.9%),吻合口狭窄5例(6.8%)。26例胃重建食管者无死亡,术后发生吻合口狭窄2例,脓胸1例。结论食管烧伤后高位的广泛狭窄可旷置瘢痕段食管采用结肠重建,中下段病变能在主动脉弓下吻合者可切除瘢痕段食管用胃重建,提高外科技术可明显降低结肠重建食管的并发症。  相似文献   

3.
目的评价全覆膜食管金属支架在高位食管狭窄和瘘以及术后吻合口狭窄和瘘治疗中的有效性和安全性。方法复旦大学附属中山医院内镜中心2005年5月至2013年7月间,应用16mm全覆膜食管金属支架对84例高位食管狭窄和瘘以及术后吻合口狭窄和瘘进行治疗。其中食管癌性狭窄31例,食管外压性狭窄2例,食管癌放疗后狭窄10例,食管癌术后复发致狭窄4例,吻合口狭窄27例,内镜黏膜下剥离术后食管狭窄1例,食管.气管瘘7例,食管一纵隔瘘1例,食管癌术后残胃瘘1例。狭窄或瘘口上缘距中切牙距离15~20cm者48例,大于20cm者36例。结果84例患者共置入100枚支架,术中无出血和穿孔等并发症发生。支架置入术后患者吞咽困难、呛咳症状均迅速缓解。术后并发症发生率为6.0%(5/84),其中严重胸痛2例,经止痛药物缓解;气管塌陷1例,予气管切开术;支架移位2例,内镜下应用异物钳对支架位置进行调整。76例(90.5%)患者获得完整随访,5-3%(4/76)的患者出现再狭窄,2.6%(2/76)新发食管.气管瘘;其中5例接受再次内镜下置入全覆膜金属支架术并获成功,另1例经沙氏探条扩张及氩离子凝固术治疗效果满意。结论全覆膜食管金属支架治疗高位食管狭窄和瘘以及术后吻合口狭窄和瘘安全、有效,可考虑作为临床首选。  相似文献   

4.
食管癌切除术后食管-胃粘膜悬入胃腔式吻合5 630例报告   总被引:2,自引:0,他引:2  
目的探讨防止食管癌术后吻合口瘘及狭窄的吻合术式。方法自1990年1月-2003年12月对5630例食管癌患者行肿瘤切除,均采用食管-胃粘膜悬入胃腔式吻合方法,遵循“窄边距、密针距、锯齿缝、轻打结”的吻合技巧,观察分析术后吻合口瘘及狭窄等并发症的发生情况。结果本组5630例术后发生吻合口瘘49例(0.87%),其中颈部吻合口瘘29例,胸内吻合瘘20例,吻合口狭窄30例(0.53%),其中颈部吻合口狭窄6例,胸内吻合口狭窄24例。结论食管-胃粘膜悬人胃腔式吻合是防止食管癌术后吻合口瘘和狭窄的有效术式。  相似文献   

5.
目的 探讨机械吻合在食管癌和贲门癌消化道重建中的应用效果。方法 对我院2000年8月~2007年8月收治的236例食管癌、贲门癌经机械吻合行消化道重建患者的临床资料,进行回顾性分析总结。结果 食管中段癌28例,食管下段癌62例,贲门癌146例。主动脉弓上吻合26例,弓下吻合114例,经腹膈顶部吻合96例。全组吻合口瘘4例(1.69%),吻合口狭窄7例(2.97%),近切端癌残留8例(3.39%)。结论 食管癌、贲门癌术中消化道重建机械吻合省时、省力,可显著降低吻合口瘘、吻合12I狭窄及切端癌残留,提高手术质量。  相似文献   

6.
目的:探讨食管切除颈部消化道重建术后吻合口良性狭窄形成的影响因素。方法回顾性分析2003-2012年间在南京医科大学附属淮安医院接受食管癌切除术并行颈部消化道重建的946例食管癌患者的临床资料。吻合口良性狭窄定义:出现吞咽困难症状、经内镜证实需内镜扩张治疗,同时排除经病理证实的恶性病变。分别应用χ^2检验和Logistic回归分析来明确与吻合口良性狭窄形成相关的危险因素。结果156例(16.5%)患者术后出现颈部吻合口良性狭窄。单因素分析显示,心血管病史(P=0.001)、糖尿病病史(P=0.041)、管状胃重建(P=0.050)、端端吻合(P=0.013)及术后出现吻合口瘘(P=0.008)与术后吻合口良性狭窄发生有关。多因素分析显示,心血管病史(P=0.004)、管状胃重建(P=0.026)、端端吻合(P=0.043)及术后吻合口瘘(P=0.001)为吻合口良性狭窄形成的独立影响因素。结论食管切除管状胃颈部重建具有较高的吻合口良性狭窄发生率。对于具有心血管病史者,应维持术后血压的稳定;尽量避免行端端吻合;对于术后吻合口瘘者,在瘘口愈合后可考虑尽早行内镜扩张以预防吻合口狭窄的形成。  相似文献   

7.
目的探讨食管严重烧伤后瘢痕狭窄的预防及治疗效果。方法分析我科1976年4月至2007年6月外科治疗171例食管严重烧伤患者临床资料。其中37例Ⅱb度烧伤患者1个月内采用食管腔内置管预防瘢痕狭窄;108例已形成瘢痕狭窄者采用胃或结肠重建食管80例,胃重建28例;颈部食管局限性烧伤狭窄和术后吻合口狭窄者29例,采用颈阔肌皮瓣修复。结果37例食管腔内置管者中32例痊愈;结肠重建80例,术后死亡6例,颈部吻合口瘘14例,吻合口狭窄4例;胃重建28例,发生吻合口狭窄2例;颈阔肌皮瓣修复29例,无术后死亡,肌皮瓣全部存活,能正常进食。结论食管腔内置管是食管烧伤早期预防狭窄的有效方法;广泛食管瘢痕狭窄可旷置食管行结肠重建,狭窄食管位于主动脉弓以下者可切除狭窄食管用胃重建;局限性颈部食管狭窄或吻合口狭窄颈阔肌皮瓣修复是较理想的方法。  相似文献   

8.
目的探讨食管腐蚀性烧伤后狭窄的外科治疗经验及胃或横结肠代食管重建手术的应用价值。方法对98例食管腐蚀性烧伤后狭窄的患者中72例广泛食管狭窄、病变超过食管中段以上者采用横结肠代食管、保留结肠左动脉升支、胸骨后顺蠕动吻合,其中横结肠咽腔吻合18例,横结肠食管颈部吻合54例,胸段食管旷置不切除;26例狭窄位于中下段,经胸切除瘢痕段食管用胃重建食管,胃食管胸内吻合。结果结肠食管重建72例中,术后死亡4例(5.56%),发生颈部吻合口瘘14例(19.44%),后期出现颈部吻合口狭窄7例,经治疗后均痊愈。胃重建食管26例无手术死亡,术后发生胸内吻合口狭窄3例,经扩张治愈。结论食管腐蚀性烧伤后狭窄在伤后20~24周可积极采取食管重建术,根据食管狭窄段严重程度及位置决定是否行狭窄段食管切除、选择食管重建替代物及吻合的位置。可采用横结肠食管颈部吻合或结肠咽腔吻合术,胸内胃食管吻合术。  相似文献   

9.
目的 探讨应用脱细胞猪主动脉基质制备人工食管进行食管替代的可行性。方法应用胰酶、Triton X-100制备脱细胞猪主动脉基质。切除5cm实验犬食管,用两片脱细胞猪主动脉基质缝制成人工食管进行重建,观察存活情况和愈合过程。结果6只实验犬无围手术期死亡,发生吻合口瘘1只,1只在行内镜下扩张治疗时导致新生食管破裂死亡。组织学结果显示术后2周时有疏松结缔组织及大量新生血管形成,4周时大部分人工食管被上皮细胞覆盖。12周时上皮细胞分化至8.10层,有黏膜下腺体结构及肌肉组织。原人工食管已完全吸收,无法用肉眼分辨人工和正常食管。结论猪胸主动脉脱细胞血管基质可作为理想的代食管材料,能较好诱导组织的再生,有较好的应用前景。实验为人工食管的临床应用研究提供了依据。  相似文献   

10.
目的探讨食管肿瘤、贲门癌行肿瘤切除后,以胃重建食管时食管-胃吻合技术的改进,预防吻合口瘘及狭窄的发生。方法采用Gambee单层吻合法及全层间断单层吻合法交替应用。结果采用此方法吻合的286例患者,吻合口瘘发生率2.7%(4/146)。吻合口瘢痕狭窄0.7%。束出现胸腔内吻合口瘘及近期吻合口狭窄。结论此法适用于食管-胃吻合术,特别适用于贲门癌胃切除较多的弓下食管-胃吻合术及食管癌切除食管-胃颈部吻合术。迄今,在广泛应用吻合器的情况下。手法缝合食管、胃吻合仍是外科医生必须熟练掌握的基本功,本文介绍的改良Gambee吻合法有推广应用价值。  相似文献   

11.
Background : We investigated the vasopressor hormone response following mesenteric traction (MT) with hypotension due to prostacyclin (PGI2) release in patients undergoing abdominal surgery with a combined general and epidural anesthesia. Methods : In a prospective, randomized, placebo-controlled study we administered 400 mg ibuprofen (i.v.) in 42 patients scheduled for abdominal surgery. General anesthesia was combined with epidural anesthesia (T4-L1). Before as well as 5, 15, 30, 45, and 90 min after MT we recorded plasma osmolality, hemodynamics and measured 6-keto-PGFlα (stabile metabolite of PGI2), TXB2 (stabile metabolite of thromboxane A2) active renin, and arginine vasopressin (AVP) plasma concentrations by radioimmunoassay. Catecholamine levels were assessed by high-pressure liquid chromatography (HPLC) with electrochemical detection. Results : Following MT, arterial hypotension occurred along with a substantial PGI2 release. This was completely abolished by ibuprofen administration. Although plasma levels of 6-keto-PGF (1133 (708) vs. 60 (3) ng/L, median (median absolute deviation), P=0.0001, placebo vs. ibuprofen) remained significantly elevated, blood pressure was restored within 30 min after MT in the placebo group. At the same point in time plasma concentrations of TXB2 (164 (87) vs. 58 (1) ng/L, P=0.0001), epinephrine (46 (33) vs. 14 (6) ng/L, P=0.001), AVP (41 ± (18) vs. 12 (7) ng/L, P=0.0004), and active renin (27 (12) vs. 12 (4) ng/L, P = 0.001) were significantly higher in placebo-treated patients. Conclusion : Under combined general and epidural anesthesia arterial hypotension following MT due to endogenous PGI2 release is associated with enhanced release of AVP, active renin, epinephrine and thromboxane A2, presumably contributing to hemodynamic stability within 30 min after MT.  相似文献   

12.
Don Dame 《Artificial organs》1996,20(5):613-617
Abstract: Virtually all blood pumps contain some kind of rubbing, sliding, closely moving machinery surfaces that are exposed to the blood being pumped. These valves, internal bearings, magnetic bearing position sensors, and shaft seals cause most of the problems with blood pumps. The original teaspoon pump design prevented the rubbing, sliding machinery surfaces from contacting the blood. However, the hydraulic efficiency was low because the blood was able to "slip around" the rotating impeller so that the blood itself never rotated fast enough to develop adequate pressure. An improved teaspoon blood pump has been designed and tested and has shown acceptable hydraulic performance and low hemolysis potential. The new pump uses a nonrotating "swinging" hose as the pump impeller. The fluid enters the pump through the center of the swinging hose; therefore, there can be no fluid slip between the revolving blood and the revolving impeller. The new pump uses an impeller that is comparable to a flexible garden hose. If the free end of the hose were swung around in a circle like half of a jump rope, the fluid inside the hose would rotate and develop pressure even though the hose impeller itself did not "rotate"; therefore, no rotating shaft seal or internal bearings are required.  相似文献   

13.
Background: Halothane inhibits in vitro and in vivo activity of cytochrome P-450 (CYP) 2E1. There are several fluorinated volatile anaesthetics besides halothane, and most of them are defluorinated by CYP2E1. It is unclear whether other fluorinated anaesthetics inhibit the in vivo activity of CYP2E1.
Methods: We compared the inhibitory effects of therapeutic concentrations of four inhalational anaesthetics, halothane, enflurane, isoflurane, and sevoflurane, on chlorzoxazone metabolism in rabbits receiving artificial ventilation.
Results: All four inhalational anaesthetics decreased arterial blood pressure and increased plasma chlorzoxazone concentration. However, no significant differences in the plasma chlorzoxazone concentration were found between the four anaesthetics. The estimated chlorzoxazone clearance increased after beginning inhalation with all four agents, but no significant difference in clearance was noted between agents.
Conclusions: At therapeutic concentrations, the in vivo inhibitory effect on chlorzoxazone metabolism was similar for all four inhalational anaesthetics examined, even though their chemical characteristics and extent of hepatic metabolism differ considerably.  相似文献   

14.
Abstract: A variety of protein-bound or hydrophobic substances, accumulating as a result of pathologic conditions such as exogenous or endogenous intoxications, are removed poorly by conventional detoxification methods because of low accessibility (hemodialysis), insufficient adsorption capabilities (hemosorption), low efficiency (peritoneal dialysis), or economic limitations (high-volume plasmapheresis). Combining advantages of existing methods with microspheric technology, a module-based system was designed. Major operating parameters of the latter can be modified to allow for adjustment to individual clinical situations. An extracorporeal blood circuit including a plasmafilter is combined with a secondary high-velocity plasma circuit driven by a centrifugal pump. Different microspheric adsorbers can be combined in one circuit or applied in sequence. Thus, a prolonged treatment can be tailored using specially designed selective adsorber materials. Comparing this system with existing methods (high-flux hemodialysis, molecular adsorbent recycling system), results from our in vitro studies and animal experiments demonstrate the superior efficiency of substance removal.  相似文献   

15.
Background : Our objective was to determine whether administration of propranolol or verapamil modifies the hemodynamic adaptation to continuous positive-pressure ventilation (CPPV), in particular the regional distribution of cardiac output (CO).
Methods : General hemodynamics and regional blood flows assessed by microsphere technique (15 (μm) were recorded in 16 anesthetized pigs during spontaneous breathing (SB) and CPPV with 8 cm H2O end-expiratory pressure (CPPV8) before and after intravenous administration of propranolol (0.3 mg · kg−1 followed by 0.15 mg · kg−1 · h−1, n=8) or verapamil (0.1 mg · kg−1 followed by 0.3 mg · kg−1 · h−1, n=8).
Results : CPPV8 depressed CO by 25% without shifts in its relative distribution with the exception of a noteworthy increase in adrenal perfusion. Propranolol increased arterial blood pressure, and due to a fall in heart rate, CO dropped by 25%. The kidneys and, to a lesser extent, the splanchic region and central nervous system received increased fractions of the remaining CO at the expense of skeletal muscle flow. Similar patterns were seen during SB and CPPV8 such that the combination of propranolol and CPPV8 depressed CO by 50%. The circulatory effects of verapamil were less evident but myocardial perfusion tended to increase.
Conclusions : The combination of propranolol or verapamil with CPPV does not result in any specific hemodynamic interaction in anesthetized pigs, except that the combined effect of propranolol and CPPV may severely reduce CO.  相似文献   

16.
Background: Obesity is increasing globallly, including in the formerly "Eastern Bloc" countries. Methods: A survey was made of obesity and bariatric surgery. Results: In the 8 East and Central European countries studied, with total population 300 million, roughly 43% of the population was overweight (BMI 25-30), 23% obese (BMI > 30), with about 15 million people morbidly obese (BMI > 40). From 0-10 morbidly obese individuals/100,000/year undergo bariatric surgery. Conclusion: Most countries were found to provide inadequate treatment for obesity.The majority of the morbidly obese are not treated effectively. However, health-care awareness of obesity and bariatric surgeons are slowly increasing.  相似文献   

17.
Background : Inhibitory effects of volatile anaesthetics on platelet aggregation have been demonstrated in several studies. However, the influence of volatile anaesthetics on intracoronary platelet adhesion has not been elucidated so far.
Methods : Isolated hearts of guinea pigs were perfused with buffer in the absence or presence of volatile anaesthetics (0.5 and 1 MAC) at constant coronary flow rates of 5 ml/min for 25 min, then 1 ml/min for 30 min and again 5 ml/min for 10 min. Before, during and after low-flow perfusion, a bolus of human platelets was applied into the coronary system. To simulate thrombogenic conditions, 0.3 U/ml human thrombin was infused during low-flow perfusion and reperfusion. The number of platelets sequestered to the endothelium was calculated from the difference between coronary in- and output of platelets. The myocardial production of lactate and consumption of pyruvate and coronary perfusion pressure were also determined.
Results : At a flow rate of 5 ml/min only about 3% of the applied platelets did not emerge from the coronary system, in any group. In contrast, 13.1±1.2% (mean±SEM) of infused platelets became adherent in low-flow perfusion in the control group without anaesthetic. The adherence was reduced with each 1 MAC isoflurane (to 6.2±1.2%), sevoflurane (to 4.4±0.9%) or halothane (to 3.2±1.5%) (each P <0.05 vs. control). Volatile anaesthetic, 0.5 MAC, did not inhibit platelet adhesion to a statistically significant extent in any case. Perfusion pressure and metabolic parameters were not statistically different between the control and the hearts exposed to anaesthetics.
Conclusion : Volatile anaesthetics in a concentration of 1 MAC can reduce the adhesion of platelets in the coronary system under reduced flow conditions. This action does not arise from vasodilation or inhibition of ischaemic stress.  相似文献   

18.
Background: It has been shown that the depressive effects of both propofol and midazolam on consciousness are synergistic with opioids, but the nature of their interactions on other physiological systems, e. g. respiration, has not been fully investigated. The present study examined the effect of propofol and midazolam alone and in combination with fentanyl on phrenic nerve activity (PNA) and whether such interactions are additive or synergistic. Methods: PNA was recorded in 27 anaesthetised and artificially ventilated rabbits. In three groups, propofol, fentanyl and midazolam were administered intravenously in incremental doses to construct dose-response curves for the depressant effects of each one on PNA. In another two groups, the effect of pretreatment with either fentanyl 1 μg · kg?1 i. v. or midazolam 0.05 mg · kg?1 i. v. on the effects of propofol and fentanyl respectively on PNA were studied. Results: Propofol and fentanyl caused a dose-dependent depression of PNA with complete abolition at the highest total doses of 16 mg · kg?1 i. v. and 32 μg · kg?1 i. v., respectively. In contrast, midazolam in incremental doses to a total of 0.8 mg · kg?1 reduced mean PNA by 63%, but approximately 12% of PNA remained at a total dose as high as 6.4 mg · kg?1. The mean ED50s, calculated from dose-response curves, were 5.4 mg · kg?1, 3.9 μg · kg?1 and 0.4 mg · kg?1 for propofol, fentanyl and midazolam, respectively. Initial doses of either fentanyl 1 μg · kg?1 i. v. or midazolam 0.05 mg · kg?1 i. v. acted synergistically with subsequent doses of either propofol or fentanyl to abolish PNA at total doses of 8 mg · kg?1 and 8 μg · kg?1, respectively. Conclusion: Fentanyl has a synergistic interaction with both propofol and midazolam on PNA and hence potentially on respiration.  相似文献   

19.
Background: Catecholaminergic support is often used to improve haemodynamics in patients undergoing major abdominal surgery. Dopexamine is a synthetic vasoactive catecholamine with beneficial microcirculatory properties. Methods: The influence of perioperative administration of dopexamine on cardiorespiratory data and important regulators of macro- and microcirculation were studied in 30 patients undergoing Whipple pancreaticduodenectomy. The patients received randomized and blinded either 2 μg · kg?1 · min?1 of dopexamine (n=15) or placebo (n=15, control group). The infusion was started after induction of anaesthesia and continued until the morning of the first postoperative day. Endothelin-1 (ET-1), vasopressin, atrial natriuretic peptide (ANP), and catecholamine plasma levels were measured from arterial blood samples. Measurements were carried out after induction of anaesthesia, 2 h after onset of surgery, at the end of surgery, 2 h after surgery, and on the morning of the first postoperative day. Results: Cardiac index (CI) increased significantly in the dopexamine group (from 2.61±0.41 to 4.57±0.78 1 · min?1 · m?2) and remained elevated until the morning of the first postoperative day. Oxygen delivery index (DO2I) and oxygen consumption index (VO2I) were also significantly increased in the dopexamine group (DO2I: from 416±91 to 717±110 ml/m2 · m2; VO2I: from 98±25 to 157±22 ml/m2 · m2), being significantly higher than in the control group. pHi remained stable only in the dopexamine patients, indicating adequate splanchnic perfusion. Vasopressive regulators of circulation increased significantly only in the untreated control patients (vasopressin: from 4.37±1.1 to 35.9±12.1 pg/ml; ET-1: from 2.88±0.91 to 6.91±1.20 pg/ml). Conclusion: Patients undergoing major abdominal surgery may profit from prophylactic perioperative administration of dopexamine hydrochloride in the form of improved haemodynamics and oxygenation as well as beneficial influence on important regulators of organ blood flow.  相似文献   

20.
A concept of balanced analgesia using nonsteroidal anti-inflammatory drugs (NSAIDs), paracetamol (acetaminophen), opioids, and corticosteroids can also be used in patients with pre-existing illnesses. NSAIDs are the most effective treatment for acute pain of moderate intensity in children; however, these drugs should be avoided in patients at increased risk for serious side effects, e.g. patients with renal impairment, bleeding tendency, or extreme prematurity. NSAIDs can be given with minimal risks to the younger child with mild to moderate asthma, and, in these patients, the use of steroids can be encouraged; in addition to their antiemetic and analgesic action, a beneficial effect on asthma symptoms can be expected. In the non-intubated child with cerebral trauma, exaggerated sedation caused by opioids and increased bleeding tendency caused by NSAIDs must be avoided. In neonates and small infants, the oral administration of sucrose or glucose is helpful to minimize pain reaction during short uncomfortable interventions.  相似文献   

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