胰高血糖素样肽-2对短肠大鼠残留小肠代偿的影响

目的研究胰高血糖素样肽-2(GLP-2)对短肠大鼠残留小肠形态及功能代偿的影响。方法将20只切除小肠75%的大鼠随机分成对照组和GLP-2组,术后1-5 d内自由进食。GLP-2组每日2次腹腔注射GLP-2(250μg·kg~(-1)·d~(-1))；对照组每日2次腹部皮下注射生理盐水0．5 ml；另设1组正常进食大鼠作空白对照。术后第6天行残留小肠黏膜形态学检测、细胞增殖核心抗原(PCNA)测定,钠葡萄糖共同转运体(SGLT1)和二肽转运体(PEPT1)的mRNA表达检测以及在体小肠循环灌流实验测定大鼠回肠的单位长度及单位重量的葡萄糖吸收率。结果GLP-2组残留小肠黏膜形态学指标、PCNA指数显著高于对照组；而小肠黏膜细胞凋亡显著低于对照组；残留回肠SGLT1和PEPT1的mRNA表达显著高于对照组；均P＜0．05。但两组灌洗段回肠每g湿重葡萄糖吸收率差异无统计学意义(P＞0．05)。结论GLP-2能刺激小肠黏膜上皮增生、抑制凋亡,促进短肠大鼠残留小肠黏膜的形态及功能代偿。     

精氨酸促进短肠综合征肠道代偿及其机制的初步研究

/L、(13.5±3.0) mg﹒cm-1·100 g-1、(26.0±2.6) μg·cm-1·100 g-1、(59.8±6.2) μg·cm-1·100 g-1、(35.4±2.3) μg·cm-1·100 g-1、(22±3)及(25±3),均P＜0.05];小肠超微结构亦观察到SB-Arg组大鼠小肠绒毛高度、隐窝深度及黏膜厚度均大于SB组大鼠(P＜0.05).结论 肠内营养中添加适量精氨酸能促进短肠综合征大鼠肠道结构及功能的代偿,其机制可能为促进肠黏膜细胞增殖、抑制其凋亡.     

短肠综合征患者的肠道代偿及康复治疗

目的 总结短肠综合征(SBS)的治疗经验。方法 分析38例SBS患者的治疗过程,随访其目前饮食情况,肠外营养(PN)或肠内营养(EN)的时间,了解并发症情况,对部分患者作有关检测,并联合应用生长激素(GH)和谷氨酰胺(GLN)治疗,采用稳定核素示踪检测残余肠道对单糖、脂肪酸及氨基酸的吸收情况。结果 本组患者死亡5例;存活33例,存活时间为6个月～17年,平均(5.9±4.3)年。目前有3例长期接受家庭PN,6例需部分或间歇性接受PN或EN补充,完全摆脱PN的有24例,其平均摆脱PN的时间为(9.5±6.6)个月。GH加GLN治疗只能在短时间内促进残余肠道对营养物质的吸收能力。结论 经过合适的肠道康复治疗,大多数SBS患者残留肠道能充分代偿,可完全摆脱PN或减少PN用量,长期健康地生存。     

Low-fat diet impairs postresection intestinal adaptation in a rat model of short bowel syndrome

Background: Low-fat diets (LFD) are utilized frequently in patients with short bowel syndrome (SBS). The purpose of this study was to investigate the effects of LFD on intestinal adaptation, enterocyte proliferation, and enterocyte cell death in a rat model of SBS.Methods: Adult male Sprague-Dawley rats were divided into 3 experimental groups: Sham-NC rats underwent bowel transection and reanastomosis and were fed normal chow (NC), SBS-NC rats underwent 75% small bowel resection and were fed NC, and SBS-rats were fed a low-fat diet (SBS-LFD). Parameters of intestinal adaptation, enterocyte proliferation, and enterocyte apoptosis were determined on day 14 after operation.Results: SBS-NC rats showed a significant increase (v Sham-NC) in jejunal and ileal bowel and mucosal weight, mucosal DNA and protein, villus height, and crypt depth. A significant 67% increase in crypt cell proliferation rate and 265% increase in villus enterocyte apoptosis was seen in the ileum of SBS-NC rats compared with control animals (P < .05). SBS-LFD animals showed lower ileal mucosal weight (29%; P < .05), jejunal crypt depth (20%; P < .05), and ileal villus height (21%; P < .05). A significant decrease in villus apoptosis in jejunum (74%; P < .05) and ileum (67%; P < .05) and a decrease in cell proliferation in ileum (35%; P < .05) was seen also after exposure to LFD compared with SBS-NC.Conclusions: In a rat model of SBS, early LFD appears to inhibit parameters of intestinal adaptation. A possible mechanisms for this effect may be decreased cell proliferation. Decreased enterocyte loss via apoptosis, found in this study, may reflect a reduced number of enterocyte.     

精氨酸促进短肠综合征肠道代偿及其机制的初步研究

目的研究肠内营养中添加精氨酸对广泛肠切除术后大鼠肠道代偿的影响。方法将30只SD大鼠随机分为Con组（假手术）、SB组（短肠对照）和SB—Arg组（短肠加用精氨酸）,各组大鼠于术后第2。14天分别给予等氮、等热量的肠内营养支持．其中SB-Arg组肠内营养中添加L-精氨酸（300mg·kg^-1·d^-1）。比较术后各组体质量、脂肪吸收率、血浆总游离脂肪酸及必需脂肪酸水平、小肠代偿指标、肠黏膜细胞增殖和凋亡的差异。结果SB组术后早期营养支持2周后,其体质量较Con组低,各项肠道代偿指标均明显升高（P〈0．05）。SB-Arg组大鼠脂肪吸收率[（84．9±3．2）％]、血浆游离脂肪酸水平[（650．0±86．5）mg／L]、回肠黏膜质量[（18．0±3．5）mg·cm^-1·100g^-1]、回肠DNA含量[（29．6±3．3）μg·cm^-1·100g^-1]、小肠蛋白质含量[空肠（65．5＋7．3）μg·cm^-1·100g^-1和回肠（39．2±2．3）μg·cm^-1·100g^-1]和小肠增殖指数（空肠31±4,回肠32±2）均高于SB组的[（81．3±3．9）％、（289．5±76．9）mg／L、（13．5±3．0）mg·cm^-1·100g^-1（26．0＋2．6）μg·cm^-1·100g^-1（59．8±6．2）μg·cm^-1·100g^-1、（35．4±2．3）μg·cm^-1·100g^-1、（22±3）及（25±3）,均P〈0．05];小肠超微结构亦观察到SB-Arg组大鼠小肠绒毛高度、隐窝深度及黏膜厚度均大于SB组大鼠（P〈0．05）。结论肠内营养中添加适量精氨酸能促进短肠综合征大鼠肠道结构及功能的代偿．其机制可能为促进肠黏膜细胞增殖、抑制其凋亡。     

Evaluation of intestinal absorption after longitudinal intestinal lengthening for short bowel syndrome

Purpose

The aim of this study was to answer if the longitudinal intestinal lengthening and tailoring (LILT) by Bianchi, modified by Aigrain, can allow the child to be weaned from parenteral nutrition (PN) and if the length of the bowel after the procedure can influence the results of the absorption test such as Schilling or d-xylose test.

Patients and Methods

We reviewed the files of 7 children who have had LILT from 1980 to 2003. We performed to explore 2 intestinal function tests: the d-xylose and the Schilling tests. Both were performed early (during the first year after the procedure) and late (during the second year) after the LILT. We used the χ² and Bartlett's correlation tests for statistical analysis.

Results

There were 6 boys and 1 girl. The surgical indication was short bowel syndrome with parenteral nutrition owing to multiple intestinal atresia (2 cases), severe necrotizing enterocolitis with volvulus (1 case), necrotizing enterocolitis (1 case), intestinal atresia with gastroschisis (2 cases), and volvulus owing to malrotation (1 case). The length of the bowel was significantly different before and after LILT (P < .0001). After LILT, the length of the bowel was significantly correlated with the percentage of PN on energy at 6 months (P = .02) and at 12 months (P = .001). Moreover, the length of the bowel after the procedure was significantly correlated with the results of the d-xylose test during the first year (P = .002) but not with the results after the second year. The length after lengthening influenced neither the results of the Schilling test during the first nor those of the second year after. Four patients were weaned from the PN 21 months in average after the LILT (57%); 1 was not because we had only a 2-month follow-up. The average follow-up was 111 (5 months; range, 4- 206).

Conclusion

Longitudinal intestinal lengthening and tailoring for short bowel syndrome is a good option to allow children to be weaned from the PN. The length of the bowel after the procedure can influence the absorption test such as d-xylose during the first postoperative year but not during the second and does not influence the Schilling test. We think it is not necessary to perform these tests during the follow-up of these patients.     

谷氨酰胺和生长激素对短肠综合征患者肠道代偿作用

目的探讨谷氨酰胺和生长激素对短肠综合征(SBS)患者的肠道代偿作用。方法26例短肠综合征患者残余小肠长度为0～100(中位数42.5)cm,手术后接受肠外营养(PN)支持3-52个月,联合应用生长激素(GH)(0.10±0.06)mg·kg-1·d-1和谷氨酰胺(GLN)(0.30±0.17)g·kg-1·d-1进行肠道促代偿治疗。结果26例接受GH加GLN治疗的SBS患者,其中9例(34.6%)治疗后近期内完全摆脱PN;8例(30.8%)经治疗后明显减少了PN用量,从每周需要PN(6.0±1.0)d下降至(4.2±1.0)d,每周PN需要量从(13.6±5.2)L降至(8.2±3.3)L;9例(34.6%)在治疗后仍依赖PN维持。结论经过合适的营养支持和肠道促代偿治疗,大多数短肠综合征患者残留肠道能充分代偿,完全摆脱PN或减少PN用量,长期健康生存。     

生长激素治疗短肠综合征患者随机对照试验荟萃分析

目的系统评价生长激素治疗短肠综合征的疗效和安全性。方法采用计算机检索、手工检索方法收集生长激素治疗短肠综合征的随机对照试验文献,按Cochrane协作网系统评价方法进行评价。结果共4个试验,70例患者被纳入本研究。Meta分析结果显示,生长激素能显著增加短肠综合征患者体重[MD＝1．66,95％CI（0．69,2．63）,P〈0．01],去脂体重[MD=1．93,95％CI（0．97,2．90）,P〈O．01],促进残余肠道对能量[MD=4．42,95％CI（0．26,8．58）,P〈0．05],氮[MD=4．85,95％CI（0．20,9．49）,P〈0．05],脂肪[MD=5．02,95％CI（0．21,9．82）,P〈0．05]的吸收。结论生长激素治疗短肠综合征短期疗效是安全、有效的,远期疗效还有待大样本、多中心的随机对照研究进一步验证。     

短肠综合征患儿血清微量营养素状况评价

目的评价短肠综合征患儿不同状态下的血清微量营养素状况。方法收集并分析2004年4月至2006年7月间收治并获随访的17例短肠综合征患儿的临床资料。结果本组患儿年龄为3个月至18岁。其中完全脱离肠外营养（PN）11例，6例仍靠部分PN支持；保留回盲瓣11例，无回盲瓣6例；剩余小肠在75cm以上者5例，小于或等于75cm者12例。采用高效液相法测定血清维生素A、E和β-胡萝卜素水平。11例已脱离PN的患儿中有9例测定了血清铁、锌和铜。维生素低于参考值的发生率：维生素A占23．5％，维生素E占35．3％，β-胡萝卜素占58．8％。在未脱离PN、无回盲瓣和剩余小肠小于或等于75cm的患儿中，维生素A和β-胡萝卜素低于参考值的发生率较高。在脱离PN和剩余小肠大于75cm的患儿，维生素E低于参考值发生率较高。而在有或无回盲瓣患儿中，上述的发生率差异无统计学意义。3例血清锌浓度低于正常．1例血清铁浓度低于正常。结论短肠综合征患儿无论在PN支持时还是恢复正常饮食时，均可能发生微量营养素缺乏，应密切随访并补充有关微量营养素。     

Relationship between biopsy-proven parenteralnutrition-associated liver fibrosis and biochemical cholestasis in children with short bowel syndrome

Purpose

The aim of the study was to determine the frequency of biochemical cholestasis (direct bilirubin [DB] ≥2 mg/dL) in children with short bowel syndrome and biopsy-proven parenteral nutrition (PN)-associated liver disease and to define predictive factors for the occurrence and degree of hepatic fibrosis.

Methods

After institutional review board approval, a retrospective review was conducted of patients followed by 2 multidisciplinary intestinal rehabilitation programs between January 1, 2000, and September 30, 2008. Inclusion criteria were exposure to PN (>30 days) and having undergone a liver biopsy. Liver biopsy specimens were graded from 0 to 3 based upon degree of fibrosis in the pathology report. The most recent DB within 10 days before biopsy was recorded.

Results

A total of 66 children underwent 83 liver biopsy procedures. The most common diagnoses included necrotizing enterocolitis (NEC) (36.4%), gastroschisis (22.7%), and intestinal atresia (15.1%). Median age at biopsy was 6.1 months with a median duration of PN of 4.7 months. Of the patients, 70.3% had a history of exposure to parenteral ω-3 lipid emulsion. Of the liver biopsy specimens, 89% (74/83) demonstrated some degree of fibrosis (fibrosis scale 1-3), including 9.6% (8/83) with evidence of cirrhosis. 83% of biopsies without fibrosis and 55% of biopsies with fibrosis were obtained in patients without evidence of biochemical cholestasis (P = .20). Three (37%) of the 8 patients with cirrhosis on liver biopsy had no evidence of biochemical cholestasis. Univariate analysis identified only gestational age (GA) at birth as significantly associated with the degree of liver fibrosis (P = .03). A multivariate logistic regression model accounting for multiple biopsy procedures in patients revealed that GA was a predictor of fibrosis only in patients with a diagnosis other than NEC (P < .01).

Conclusions

In children with short bowel syndrome, biochemical cholestasis does not reflect the presence or degree of histologically confirmed PN-associated liver fibrosis. Careful follow-up, combined with further refinement of diagnostic and hepatoprotective strategies, may be warranted in this patient population.     

Decrease in hepatic circulation induces hepatic fibrosis in a neonatal piglet model with short bowel syndrome

Background

Regarding the complications associated with short bowel syndrome (SBS), progressive liver failure is one of the most severe complications known to occur: Although several studies have suggested that many factors interactively influence this clinical condition we investigated the relationship between hepatic circulation and hepatic fibrosis using a neonatal piglet SBS model.

Materials and Methods

This study used the following 4 groups of neonatal piglets: a group with an 80% resection of the small bowel (SBS group), a group with a bypass operation of the small bowel (functional SBS group), a group with only a laparotomy as a sham operation (sham group), and a no operative treatment group (control group). We measured the hepatic circulation just before and after the reconstruction of the intestine, as well as on the 7th and 14th postoperative day. In addition, both blood and hepatic tissue samples were collected to investigate them both biochemically and morphologically.

Results

Regarding the biochemical liver function and the tissue blood flow of liver, there were no significant differences among all groups on any investigated days. However, on both the 7th and 14th postoperative days, the portal venous flow in the SBS group was significantly lower than that in other groups. According to a histological analysis, only hepatic samples on the 14th postoperative day showed mild hepatic fibrosis in the SBS group. Regarding the α-smooth muscle actin staining findings that expresses active stellate cells, numerous positive cells were found to be distributed in the perisinusoidal space on the 14th postoperative day in the SBS group.

Conclusion

Based on our data, a decrease in the hepatic circulation, especially in the portal venous flow, after a massive resection of the intestine may cause progressive liver dysfunction because of the activation of hepatic stellate cells.     

胰高血糖素样肽-2对短肠大鼠残留小肠代偿的影响

目的　研究胰高血糖素样肽 2 (GLP 2 )对短肠大鼠残留小肠代偿的影响及机制。方法　 75 %小肠切除大鼠随机分成空白 (SB)组、生长激素 (GH )组和GLP 2组。术后 6d行残留回肠黏膜形态学检测、细胞增殖核心抗原 (PCNA)测定及原位末端标记 (INST法 )染色。结果　GLP 2组回肠黏膜形态学指标显著高于SB组 (P <0 .0 5 ) ,并且其黏膜厚度显著高于GH组 (P <0 .0 5 )。GLP 2组PCNA指数显著高于SB组 (0 .5 1± 0 .0 9与 0 .40± 0 .0 6比较 ,P <0 .0 5 ) ,但和GH组比较差异无统计学意义 (P >0 .0 5 )。GLP 2组细胞凋亡显著低于SB组 (67.7± 10 .1与 81.7± 12 .9比较 ,P <0 .0 5 ) ,但和GH组比较差异无统计学意义 (P >0 .0 5 )。结论　GLP 2能刺激小肠黏膜上皮增生 ,抑制凋亡 ,显著促进短肠大鼠残留小肠黏膜的形态代偿。     

Intestinal adaptation in short bowel syndrome

Regaining enteral autonomy after extensive small bowel resection is dependent on intestinal adaptation. This adaptational process is characterized by hyperplastic growth of the remaining gut, which is accompanied by both an increase of cell division at the level of the crypt cells and by an increased rate of programmed cell death (apoptosis). Apart from the absorptive function, the small bowel also has a barrier function and plays an important role in interorgan metabolism. Also, these functions are greatly affected by a massive intestinal resection and subsequent recovery by intestinal adaptation. This review aims to give an overview of the debilitating effects of massive intestinal resection on gut function and subsequently discusses intestinal adaptation and possible factors stimulating adaptation.     

短肠综合征的肠内营养支持

目的探讨短肠综合征患者肠内营养支持的临床意义、疗效及注意事项。方法回顾性总结1999至2005年收治的40例短肠综合征患者的临床资料。所有患者均存活至今,并随访2年以上。统计分析其肠内营养用量、费用、脱离肠外营养时间及目前营养状况。结果40例患者平均残存小肠（50．8±29．4）cm,脱离肠外营养平均时间为（29．1±9．2）个月。肠内营养用量为（3284．0±1408．8）kJ／d,其费用显著低于肠外营养（P〈0．01）。目前本组患者平均体质指数为（17．8±3．2）kg,／m^2,血红蛋白（113．3±14．8）g／L,血清白蛋白（35．0±4．1）g／L。平均大便次数为（3．4±1．7）次／d,平均大便量为（720．2±350．3）ml／d。结论肠内营养对于维持短肠综合征患者营养状况、减少并发症具有重要意义,但在具体实施时需掌握方法。     

Oral absorption of tacrolimus in children with intestinal failure due to short or absent small bowel

We describe two children with intestinal failure due to short or absent small bowel who underwent isolated liver transplantation for liver disease related to parenteral nutrition. Both received reduced-size liver grafts whilst awaiting a suitable small bowel donor. Immunosuppressive therapy was based on oral tacrolimus and intravenous steroids. Therapeutic levels of tacrolimus were achieved at low dosage of 0.14–0.28 mg/kg per day. Median and mean blood tacrolimus levels were 9.9 and 13.7 ng/ml (range 4.9–42.3 ng/ml) in case 1 and 5.8 and 7.2 ng/ml (range 1–30 ng/ml) in case 2 before small bowel transplantation, respectively. Following small bowel transplantation, levels were 17.1 and 20.1 ng/ml (range 9.2– 30 ng/ml), with oral doses of 0.54–1.35 mg/kg per day. Both children died of adenovirus pneumonia, with functioning grafts. Our experience demonstrates that effective levels of immunosuppression can be achieved by oral administration of tacrolimus in children with short or absent small bowel. Received: 10 November 1998 Received after revision: 4 May 1999 Accepted: 19 July 1999     

脾腔分流术治疗小儿肝外型门脉高压症

脾肾静脉分流是治疗小儿肝外型门脉高压症的有效手段，但因肾静脉位置深、细小，增加了手术难度，影响疗效。报告我院近期采用脾腔静脉分流术式治疗３例，均为女性，年龄９￣１２岁，反复出血史６￣１０年。钡餐示重度食道静脉曲张，肝外病变由彩色超声检查证实。术中切除脾脏，测得脾静脉口径６￣９ｍｍ。将脾静脉与下腔静脉作端侧吻合，手术顺利。术后随访１２￣１８个月，２例一般情况良好，１例（脾静脉口径６ｍｍ）术后８个月时     

乳果糖对门静脉高压鼠肠道屏障功能的影响

目的:研究乳果糖对门静脉高压大鼠肠上皮细胞紧密连接蛋白的表达、细菌易位及内毒素血症的影响。方法:用50只雄性SD大鼠建立CCl4橄榄油复合法门静脉高压模型,并行影像学检验。造模后大鼠随机分为治疗组、对照组和单纯模型组。治疗组即乳果糖组,灌服乳果糖每次5mL/kg,每日2次,直至大鼠排稀便(共7d);对照组仅灌服相同浓度的葡萄糖水。8d后处死大鼠,取血、肝、脾、肾和肠系膜淋巴结组织匀浆后作细菌培养,测细菌易位率;取小肠组织行HE、Masson染色和超微病理的观察研究;测定血内毒素;用免疫组织化学方法测定小肠紧密连接蛋白表达水平。结果:与对照组及模型组比较,治疗组细菌易位发生率明显降低(P0.05),其肝功能得到显著改善(P0.01),血清内毒素水平(0.18±0.09)EU/mL亦有明显降低(P0.01),紧密连接蛋白表达亦有显著差异(P0.01)。结论:乳果糖灌胃可增加门静脉高压大鼠肠上皮细胞紧密连接蛋白的表达,维持肠上皮紧密连接,减少肠道细菌易位,减轻内毒素血症,并在一定程度上改善肝功能。为临床门静脉高压病人的治疗提供新的思路和理论基础。     

短肠综合征患者血清瓜氨酸水平与小肠吸收面积和功能的相关性

目的研究短肠综合征患者血清瓜氨酸水平的变化及其与肠道面积及吸收功能的相关性。方法采用高效液相色谱法测定22例短肠患者（短肠组）和33例健康人（对照组）血清瓜氨酸水平。短肠患者残存小肠长度及直径采用X线造影检测，并测定短肠患者尿D-木糖排泄率和肠道蛋白吸收度。分析短肠患者血清瓜氨酸与残存小肠长度、面积、蛋白及D-木糖吸收的相关性。6例行肠康复治疗的患者测定康复治疗前后瓜氨酸、D-木糖及蛋白吸收水平的变化。结果短肠组血清瓜氨酸水平显著低于健康对照组[（5．94±2．65）比（16．87±5．97）μmol／L，P〈0．01]。短肠组患者血清瓜氨酸水平与残存小肠长度（r=0.82）及表面积（r=0.86）呈正相关，与尿D-木糖排泄（r=0.56）及肠道蛋白吸收（r=0.48）也呈正相关。6例行肠康复治疗的患者治疗后血清瓜氨酸水平、蛋白及D-木糖吸收均显著增加，但3者增加百分比之间并无相关。结论血清瓜氨酸水平与短肠患者的小肠吸收面积和吸收功能呈正相关，能反映短肠患者小肠功能和衰竭程度，是康复疗效的良好指标。     

短肠综合征时结肠的代偿研究

目的　观察及评价短肠大鼠结肠代偿性增生及结肠对营养物质吸收的促进作用。　方法　制作切除（80～85）%的超短肠大鼠模型,用百普素(Pepti-2000)做肠内营养（EN）治疗,观察全身营养状况和结肠形态学的改变,并在术后第21天用木糖和15N-甘氨酸混合液对带血管蒂的结肠进行封闭式灌注,观察结肠对水、碳水化合物和氨基酸的吸收情况。　结果　EN组于术后第21天净氮平衡与对照组（CONT）无差异,体重仅比术前减轻(10±18)g。结肠壁明显增厚,皱襞增大增粗,结肠壁的厚度、粘膜厚度、皱襞高度和皱襞表面积与CONT组相比差异具有非常显著性意义（P＜0.01）。EN组与CONT组相比DNA指数1.21±0.11vs.1.01±0.15(P＜0.05),S期细胞百分比（52.6±5.5）%vs.（42.9±4.1）%（P＜0.05）。连续循环灌注3h之后EN组对水、木糖和氨基酸的吸收明显高于CONT组（P＜0.05）。　结论　大鼠结肠在短肠综合征时发生了明显的形态和功能上的代偿。早期适当的肠内营养不但可使超短肠大鼠获得足够营养支持,并且能够促进短肠大鼠结肠代偿。