幽门螺杆菌感染对肝硬化患者高氨血症的影响

目的观察肝硬化患者合并幽门螺杆菌(Hp)感染与高氨血症的关系。方法采用尿素酶快速试验(RUT),14C-尿素呼气试验(14C-UBT)和血清抗Hp抗体测定,对64例肝硬化患者行幽门螺杆菌检测和血氨测定。对Hp阳性者给予根除治疗后复查血氨,比较根除治疗前后血氨浓度。结果肝硬化患者Hp感染率为67.2%,在根除Hp治疗后血氨浓度明显下降,与根除前相比差异有显著性(P<0.05);Hp阳性者与Hp阴性者血氨浓度比较差异有显著性(P<0.05)。结论Hp感染可导致肝硬化患者血氨升高,根除Hp后可使血氨水平明显下降。     

老年肝硬化患者幽门螺杆菌感染对血氨浓度的影响

目的　探讨老年肝硬化患者幽门螺杆菌 (Hp)感染情况及其对血氨浓度的影响。方法　 65例老年肝硬化患者分别测定 Hp感染情况及空腹血氨浓度 ,给予降氨治疗。对于降氨治疗血氨下降不明显者加用根除 Hp治疗方案后再次测定血氨。结果　老年肝硬化 Hp阳性者空腹血氨较Hp阴性者显著升高 (P<0 .0 1 ) ;根除 Hp后 ,血氨浓度显著下降 (P<0 .0 1 )。结论　抗 Hp治疗可能有助于老年肝硬化患者预防及治疗高氨血症以及由此诱发的肝性脑病及亚临床肝性脑病。     

幽门螺杆菌感染对肝硬化患者血氨浓度的影响

探讨肝硬化患者幽门螺杆菌(Hp)感染与血氨的关系,及根除性治疗Hp对血氨的影响。84例肝硬化高血氨患者,分为Hp阳性组51例,阴性组33例。两组都给予支链氨基酸、乳果糖、基础护肝治疗两周,治疗前后分别测空腹静脉血氨。随后将Hp阳性组随机分两组,A组26例,应用三联疗法治疗一周;B组25例,奥美拉唑治疗一周,治疗结束一个月后复查血氨。发现阳性组的血氨与阴性组相比有显著差异(P＜0．01)。阳性组不同肝功能分级组血氨浓度之间有显著差异(P＜0．01);阴性组则否。Hp阴性组治疗前后血氨浓度变化差异有显著性(P＜0．01),阳性组则无显著差异。根除Hp治疗后血氨明显下降(P＜0．01),而用洛赛克治疗后血氨轻度升高,但无统计学意义。说明Hp感染与肝硬化患者血氨升高有密切相关性,根除Hp的治疗能有效降低血氨。     

幽门螺杆菌感染对高氨血症和肝性脑病发病的影响

目的了解幽门螺杆菌(Hp)感染和血氨水平、肝性脑病(HE)发病的关系,并探讨根除Hp对血氨水平和HE发生的影响。方法2003年7月-2005年1月在浙江省5个地区收集肝硬化住院患者,记录患者的一般资料、数字连接试验结果、Hp感染情况、肝功能Child-Pugh分级、血氨水平和HE情况。Hp(+)患者予“奥美拉唑+克拉霉素+替硝唑”1周根除治疗,1个月后查~(14)C尿素呼气试验,并记录患者的神经精神症状和血氨水平。结果(1)共收集肝硬化住院患者457例,Hp感染率60．6%,HE发生率47．5%。检出亚临床肝性脑病(SHE)患者55例,SHE占未发生HE肝硬化患者的47．0%(55/117)。(2)Hp(+)和Hp(-)肝硬化患者血氨浓度分别为(78．4±63．6)μmoL/L和(53．8±51．4)μmol/L(P＜0．01);根除Hp后血氨显著下降至(53．5±37．7)μmol/L(P＜0．01)。Hp(+)和Hp(-)肝硬化患者HE发生率差异有统计学意义(58．5%比30．6%,P＜0．01);根除Hp后HE发生率下降至34．1%(P＜0．01)。(3)HE、SHE和肝硬化患者的Hp感染率分别为74．4%、69．1%和53．2%(P＜0．05)。三组患者的血氨水平分别为(94．5±75．6)μmol/L、(59．9±49．2)μmol/L和(47．3±33．5)μmol/L(P＜0．05)。结论Hp感染是引起肝硬化高氨血症和并发HE的重要因素,根除Hp有利于治疗和预防HE的发生。     

幽门螺杆菌感染对鹿城区高氨血症和肝性脑病发病的影响分析

目的探讨幽门螺杆菌(Hp)对鹿城区高氨血症和肝性脑病发病的影响。方法回顾性分析我院2013年6月~2015年6月60例住院肝硬化患者临床资料,并检测患者Hp和血氨水平及肝性脑病症状、数字连接试验结果等。Hp阳性者采用Hp三联根治疗法治疗1周,并于1个月后复查空腹下血氨水平,采用快速尿素酶试验检测其Hp感染情况。结果 60例肝硬化住院患者,其中Hp感染者为37例,占61.7%;肝性脑病者为28例,占46.7%。肝性脑病和亚临床肝性脑病及肝硬化无肝性脑病患者发生Hp感染率分别为75.0%(21/28)、66.7%(10/15)、29.4%(5/17);比较差异有统计学意义(P0.05);肝性脑病和亚临床肝性脑病及肝硬化无肝性脑病患者血氨水平分别为(95.1±51.2)μmol/L、(60.2±19.8)μmol/L、(47.5±14.6)μmol/L,比较差异有统计学意义(P0.05);经Logistic回归分析发现,血氨水平、上消化道出血、Child-Pugh、肝肾综合征及血红蛋白量为肝性脑病发生危险因素。结论根治Hp可有利于临床预防及治疗肝硬化肝性脑病。     

幽门螺杆菌感染对肝硬化血氨浓度的影响

目的探讨根除幽门螺杆菌(Hp)对肝硬化患者血氨浓度的影响。方法将32例肝硬化患者分为Hp阴性组(E组)12例,Hp阳性组20例(将其分为F组9例,G组11例)。E、F两组行护肝、降血氨标准化治疗,G组在此基础上行Hp根除治疗,疗程1周,治疗前后分别测空腹血氨浓度。结果①32例肝硬化患者Hp阳性20例,Hp感染率62.5%;②治疗前Hp阳性组和阴性组血氨浓度比较无统计学差异(P>0.05);③治疗前不同肝功能Ch ild-Pugh分级与血氨浓度呈明显正相关(P<0.01);④治疗后E、F、G三组血氨浓度比较无统计学差异(P>0.05);⑤三组治疗前后血氨浓度有统计学差异(P<0.01)。结论根除治疗并未使Hp阳性的肝硬化患者血氨浓度进一步降低,提示Hp感染可能与肝硬化高氨血症无明显相关。     

肝硬化与幽门螺杆菌感染关系的临床研究

背景：在肝硬化患者中，胃幽门螺杆菌（H．pylori）感染可导致产氨增加，使肝性脑病的发病率升高，但H．pylori感染是否为肝硬化血氨水平升高的致病原因仍存在争议。目的：研究肝硬化患者的H．pylori感染状况及其与血氨水平和轻微肝性脑病（MHE）的关系。方法：选取符合诊断标准的肝硬化患者和健康志愿者，胃镜下取胃窦和胃体黏膜行快速尿素酶试验并作病理学检查检测H．pylori，两项均阳性判为H．pylori感染；检查血氨水平；行数字连接试验A（NCT—A）、数码符号试验（DST）和脑电图（EEG）检查，其中任一项异常即可诊断MHE。随机选取H．pylori感染者予奥美拉唑、阿莫西林和克拉霉素～周标准三联根除治疗，停药6—8周后行^13C-尿素呼气试验判断H．pylori根除情况。所有研究对象于停药6～8周后或第一次检查后7-9周复查血氨水平、NCT—A、DST和EEG。结果：106例肝硬化患者和30名健康志愿者进入本研究。肝硬化组的H．pylori感染率（46．2％，491106）高于健康对照组（30．0％，9／30），但差异无统计学显著性（P〉0．05）。各组H.pylori感染者根除治疗前后的血氨水平均无显著差异（P〉0．05），肝硬化MHE组H．pylori根除后NCT—A、DST和EEG检查结果未见改善。结论：肝硬化患者MHE的发生和血氨水平与H．pylori感染无关。     

小肠细菌过度生长相关性轻微肝性脑病患者的血氨变化

目的 观察肝硬化患者小肠细菌过度生长相关性轻微肝性脑病(MHE)患者的血氨水平.探讨血氨与轻微肝性脑病的关系.方法 对90例肝硬化患者及20例健康志愿者进行血氨、葡萄粮氢呼气试验、数宁连接试验和数字符号试验检测.观察小肠细菌过度生长相关性轻微肝性脑病患者的血氨水平差异.结果 肝硬化组小肠细菌过度生长(36.7%,33/90)明显高于健康对照组(5%,1/20).20名健康志愿者未检出 MHE;90例肝硬化患者轻微肝性脑病37例(41.1%),其中伴小肠细菌过度生长肝硬化患者轻微肝性脑病发生率高于不伴小肠细菌过度生长患者.血氨水平均正常,但肝硬化组血氨水平高于健康对照组;肝硬化小肠细菌过度生长组血氨水平(47.9 μmol/L±7.8 μmol/L)高于无小肠细菌过度生长组(34.2μmol/L±6.8 μoL/L,P<0.05);轻微肝性脑病组血氨水平(46.2μmol/L±5.9μmoL/L)高于无轻微肝性脑病组(33.9μmol/L±7.6μmol/L,P<0.05).应用抗生素抑制小肠细菌过度生长及乳果糖治疗1周后葡萄糖氧呼气试验(GHBT)、血氨水平、数字连接试验(NCT-A、NCT-BC)及数字符号试验(DST)检查结果改善.结论 血氨对伴小肠细菌过度生长的轻微肝性脑病的发生及进展可能有一定的关系.     

胃内pH值对肝硬化伴幽门螺杆菌感染患者血氨的影响

目的研究胃内pH值对肝硬化伴幽门螺杆菌(Hp)感染患者血氨的影响.方法对37例Hp阳性的肝硬化患者及40例Hp阴性的肝硬化患者,测定基础血氨后,静脉注奥美拉唑针40 mg,同时动态监测胃内pH值的变化,待胃内pH＞6 且持续1 h后,复测血氨.结果Hp阴性与阳性肝硬化患者的基础血氨水平差异无显著性(P＞0.05).胃内pH升高后,发现Hp阴性的肝硬化患者及Hp阳性的肝硬化Child-Pugh A级患者,血氨水平与实验前差异无显著性(P＞0.05).Hp阳性的肝硬化Child-Pugh B、Child-Pugh C级患者血氨水平较前明显升高,分别由 26.33±6.49 μmol/L、35.30±10.25 μmol/L升高至35.80±6.25 μmol/L、52.20±17.01 μmol/L,差异有非常显著性意义(P＜0.01).结论肝功能状况和胃内pH值是影响Hp感染肝硬化患者血氨水平的两个重要因素.     

10天序贯疗法和传统三联疗法根除幽门螺杆菌的疗效比较

[目的]比较10d序贯疗法与传统三联疗法根除幽门螺杆菌（Hp）的疗效。[方法]选取78例^14C-尿素呼气试验阳性病例,随机分为2组：治疗组（39例）前5天予埃索美拉唑、阿莫西林,后5天予埃索美拉唑、克拉霉素、替硝唑治疗;对照组（39例）予埃索美拉唑、克拉霉素、阿莫西林治疗10d。疗程结束1个月后行^14C-尿素呼气试验检测。[结果]治疗组^14C-尿素呼气试验检测阴性者37例,阳性者2例,根除率为94．87％;对照组^14C-尿素呼气试验检测阴性者32例,阳性者7例,根除率为82．05oA,2组Hp根除率比较差异有统计学意义（P〈0．05）,2组不良反应比较差异无统计学意义。[结论]10d序贯疗法治疗Hp感染的根除率较传统三联疗法高。     

Diagnosis of Helicobacter pylori in bleeding peptic ulcer patients,evaluation of urea-based tests

BACKGROUND/AIMS: The prevalence of Helicobacter pylori (Hp) has been reported to be lower in patients with bleeding peptic ulcers than in patients with nonbleeding peptic ulcers. This might be due to inaccuracy of the urease-based diagnostic tests when used in patients with bleeding peptic ulcers. The aims of this study were to compare the validity of the rapid urease test (RUT) and (13)C-urea breath test in patients with bleeding (group 1) and nonbleeding peptic ulcers (group 2) and to examine whether the presence of blood in the stomach influences the validity of urease-based tests. METHODS: 95 consecutive patients with bleeding peptic ulcers (48 with and 47 without blood in the stomach) and 44 with uncomplicated peptic ulcers. Biopsies for RUT and histology were obtained during endoscopy. After endoscopy a (13)C-urea breath test was performed. Positive histology was used as 'gold standard' defining positive Hp-status. RESULTS: The prevalence of Hp-infection was 44/95 (46%) in group 1 and 29/44 (66%) in group 2 (p = 0.04). The sensitivities and specificities of RUT, (13)C-urea breath test and serology (control) were between 0.72 and 0.96; no difference was found between the groups. In group 1 the sensitivity of the RUT decreased from 0.96 when no blood was present to 0.60 when blood was present (p = 0.006). The sensitivity of (13)C-urea breath test was not affected by blood in the stomach. CONCLUSION: When comparing patients with bleeding and nonbleeding peptic ulcers, we did not find any difference in either sensitivity or specificity of the diagnostic tests for Hp. However, the sensitivity of the RUT was lower when blood was present in the stomach, which was the case in only half of the patients. The sensitivity and specificity of the (13)C-urea breath test was not affected by the presence of blood in the stomach.     

儿童幽门螺杆菌感染情况及其与上消化道症状的关系

[目的]探讨儿童幽门螺杆菌（Hp）感染与上消化道症状及胃黏膜病变的关系.[方法]纳入300例有上消化道症状患儿,Hp感染情况采用13C或尿素呼气试验或血清Hp抗体检查,204例患儿接受胃镜检查.[结果]①Hp阳性率为34.67％（103/300）,男女患者Hp阳性率差异无统计学意义（P＞0.05）,3～6岁、7～10岁及11～14岁年龄组Hp阳性率依次升高,组间差异有统计学意义（P＜0.05）;②胃镜检查显示39.21％患儿（80/204）有胃黏膜病变,Hp阳性者胃黏膜病变比例高于Hp阴性者（P＜0.05）;③Hp阴性者胃黏膜病变以轻-中度为主,而Hp阳性者胃黏膜病变以中-重度为主,两者病变严重程度的差异有统计学意义（P＜0.05）.[结论]有上消化道症状儿童Hp阳性率较高,且随年龄增长而增高,Hp感染与胃黏膜病变发生及严重程度相关.     

幽门螺杆菌根除后再感染与溃疡复发

为明确本地区患者幽门螺杆菌(Hp)根除后再感染和溃疡复发情况,本研究以~(14)C-尿素呼气试验和胃镜检查(尿素酶、组织学及细菌培养),对十二指肠溃疡患者 Hp 根除后共184例进行2年定期随访,并配合随机引物扩增的 DNA 多态指模技术鉴定 Hp 复发与再感染。结果发现:Hp 根除后第1、2年再感染率为0.55%和0.56%;Hp 持续阴性者仅有1.1%溃疡复发;全部病例未发生溃疡出血,而同期 Hp 无根除的对照组2年溃疡累积再出血率为26.6%(P<0.005)。结果证明,成人患者 Hp 根除后对 Hp 再感染不易感,发展中国家 Hp 根除后再感染率也相当低,以预防溃疡复发为目的的 Hp 根除疗法同样适用于高 Hp 感染率地区。     

14C-urea breath test to diagnose gastric Helicobacter pylori colonization

Helicobacter pylori (H. pylori), ex-Campylobacter pylori, is now considered to be the causative agent of active chronic gastritis in humans and may be diagnosed by histology, gram-stain, culture, urease test or noninvasively by 14C-urea breath test. The aim of this study was to determine the sensitivity, specificity, and reproducibility of the breath test as compared with the microbiological (culture) "gold standard". Forty-one subjects were studied. Gastroscopy was performed in all participants and 2 antral mucosa biopsy specimens were taken for urease test and microbiological (gram-stain and culture) studies. The breath test was performed within one week after the gastroscopy. After fasting overnight, a control breath sample was obtained and a standard meal was offered to delay gastric emptying. Then, the participants drank 5 microCi of 14C-urea in 20 ml of water and breath samples were collected at 10, 15, 30 and 60 min in a hyamine-ethanol solution with a p-H indicator. A repeat test was performed in 9 subjects to assess test reproducibility. Twenty-nine subjects (71 percent) were Hp positive and 12 (29 percent) H. pylori negative. A highly significant difference (p less than 0.0001) was observed in 14CO2 exhalation in colonized and non-colonized subjects in samples collected at all times studied. As compared with culture we found that the breath test was 97 percent sensitive and 100 percent specific. We conclude that 14C-urea breath test is a simple, inexpensive, sensitive, and reliable method to detect H. pylori colonization. It is a useful test to epidemiologic and therapeutic trials.     

疣状胃炎外周血T淋巴细胞亚群检测及其临床意义

目的:检测疣状胃炎患者(n=35)外周血T淋巴细胞亚群CD_3+、CD_4+、CD_8+,并与107例慢性浅表性胃炎中的幽门螺杆菌(Hp)感染的患者(n=16)比较。方法:所有患者均通过胃粘膜活检快速尿素酶试验和~(14)C-尿素呼气试验以确定是否有Hp感染,用流式细胞术方法检测疣状胃炎和Hp感染的浅表性胃炎患者外周血T淋巴细胞亚群CD_3+、CD_4+、CD_8+。结果:疣状胃炎Hp感染率明显高于慢性浅表性胃炎者(P<0.01);与Hp感染的浅表性胃炎比较,疣状胃炎CD_3+、CD_8+降低以及CD_4+/CD_8+比值增加(P<0.01,P<0.05)。疣状胃炎中Hp阳性组与Hp阴性组比较CD_8也明显降低(P<0.05)。结论:疣状胃炎发病可能有免疫因素参与。     

嗜酸乳杆菌联合四联疗法根除幽门螺杆菌的补救治疗

背景:随着抗菌药物广泛应用,标准三联疗法根除幽门螺杆菌(Hp)的疗效呈下降趋势。近来研究显示嗜酸乳杆菌(LA)对Hp具有一定抑制作用。目的:评价LA联合四联疗法对根除Hp补救治疗的疗效。方法:584例经标准三联疗法根除Hp失败的患者随机分为实验组和对照组,实验组前7d口服埃索美拉唑20mgbid+复方铝酸铋1.3gtid+克拉霉素250mgbid+替硝唑1.0gbid+复方嗜酸乳杆菌片1.0gtid,后3个月口服复方嗜酸乳杆菌片1.0gtid。对照组前7d口服埃索美拉唑20mgbid+复方铝酸铋1.3gtid+克拉霉素250mgbid+替硝唑1.0gbid+维生素C片0.1gtid,后3个月口服维生素C片0.1gtid。治疗结束后4周以14C-尿素呼气试验评估根除疗效,试验结果阴性的患者在治疗结束后第3、6、9、12个月复查14C-尿素呼气试验。结果:实验组实际完成方案者259例,对照组实际完成方案者267例。实验组、对照组按意向治疗(ITT)分析Hp根除率分别为84.8%和61.4%,按方案(PP)分析Hp根除率分别为90.3%和70.8%,实验组ITT和PP根除率均显著高于对照组(P<0.05)。实验组Hp累积阴性率为98.8%±0.8%,对照组Hp累积阴性率为96.7%±1.5%,实验组Hp累积阴性率较对照组显著升高(P<0.05)。实验组Hp复发风险为0.007%±0.001%,对照组Hp复发风险为0.501%±0.013%,实验组Hp复发风险较对照组显著降低(P<0.05)。结论:LA联合四联疗法可作为安全有效的Hp根除失败的补救治疗。     

Prevalence of gastric cancer decreases with age in long-living elderly in Japan, possibly due to changes in Helicobacter pylori infection status

OBJECTIVES: The prevalence of Helicobacter pylori (Hp) infection and the development of gastric cancer are both believed to increase with age in Japan. However, no studies have investigated people older than 65 years in detail. In this study, we investigated the prevalence of Hp infection and gastric cancer in the elderly, and analyzed the influence of both factors on longevity. METHODS: All patients investigated were 65 years old and over. A total of 1877 autopsy cases were used to investigate the prevalence of gastric cancer and colonic cancer. Serum samples were obtained from 644 patients with dyspepsia and analyzed for Hp-IgG antibodies. Of these 644 patients, 63 underwent upper gastrointestinal endoscopies. Five biopsies were obtained and evaluated for the following morphological variables: neutrophils, mononuclear cell, atrophy, and intestinal metaplasia. Hp infection was evaluated histologically and with the (13)C-urea breath test. RESULTS: The prevalence of gastric cancer was significantly lower in subjects older than 85 years. The positive rate of serum Hp-IgG, and Hp infection as detected histologically and by the (13)C-urea breath test, also decreased with age. In Hp(+) patients, the neutrophil score significantly decreased with age. In Hp(-) patients, however, the intestinal metaplasia score significantly increased with age. CONCLUSIONS: The non-infection of Hp itself is not related to longevity in Japanese elderly, because even Hp(-) patients appear to have been infected previously with Hp. The lower prevalence of gastric cancer in the elderly may be due to the disappearance of Hp colonization, which may contribute to longevity in Japanese elderly.     

How reliable are the 14C-urea breath test and specific serology for the detection of gastric Campylobacter?

Detection of gastric Campylobacter by the 14C-urea breath test and serology were correlated to biopsy culture in 25 unselected outpatients referred for gastroscopy. All the 17 culture-positive patients had positive 14C-urea breath test, and 16 had positive serology. Of eight culture-negative patients, six patients had negative breath test and seven negative serology. A high degree of reproducibility was found when two subsequent breath tests were performed in 11 healthy volunteers. The breath test values obtained at 10 min showed a strong correlation (r = 0.97, p less than 0.001) to the accumulated values within 30 min. Breath sampling once, 10 min after intake of 2.5 microCi 14C-urea, seems sufficient for the detection of gastric Campylobacter. The 14C-urea breath test correlates well with biopsy culture and provides a sensitive tool for the detection of gastric Campylobacter. Serology also corresponds well with biopsy culture and should provide a useful tool for epidemiologic studies.     

不同幽门螺旋杆菌感染状态胃镜下黏膜特点分析

目的探讨感染幽门螺旋杆菌(Hp)及Hp阴性患者胃镜下黏膜表现的差异,旨在为临床诊疗工作提供参考依据。 方法回顾性分析2017年12月至2019年3月经天津医科大学附属第二医院消化内科门诊收治的14C呼气试验(＋)及14C呼气试验(－)并同时间段行胃镜检查的受检者共1 792例内镜下观察,对胃黏膜表现进行记录,并分析Hp阳性及Hp阴性的胃镜下黏膜差异。 结果(1)不同Hp感染状态胃镜下黏膜表现差异分析上,单因素分析显示,消化性溃疡、点状发红、斑片状发红、线状红斑、黏膜出血、结节样改变、黏膜水肿、黏膜萎缩、皱襞肿大、增生性息肉在Hp感染者及Hp阴性患者的胃镜下黏膜表现有显著的统计学差异(P<0.05),且以上表现在Hp感染者中发生率高。反流性食管炎(RE)、规则的集合静脉(RAC)、胃底腺息肉在Hp阴性者中发生率较Hp阳性者高,有明显统计学差异(P<0.05)。黏膜糜烂在Hp阳性者及Hp阴性者中无显著统计意义(P>0.05),但胃窦部隆起型糜烂在Hp感染者中发生率明显高于未感染Hp患者,差异有统计学意义(P<0.05)。多因素Logistic回归分析显示,RE、RAC、胃底腺息肉在Hp阴性者中发生率高,差异有统计学意义(P<0.05)。消化性溃疡、点状发红、结节样改变、黏膜水肿、黏膜萎缩、线状红斑、斑片状发红、胃窦部隆起型糜烂在Hp感染者中发生率高,差异有统计学意义(P<0.05)。(2)不同胃镜下黏膜表现对于预测Hp感染与否的诊断价值分析上,RAC对预测Hp阴性的AUC、敏感性、特异性、阳性预测值及阴性预测值分别为0.750、65.6%、84.5%、77.8%及74.7%;胃底腺息肉预测Hp阴性的特异性、阳性预测值分别为99.8%、96.4%。RE患者诊断Hp阴性的特异性高达94.7%;黏膜点状发红作为预测Hp阳性的敏感性为80%,特异性为74.9%,AUC为0.774,阳性预测值为79.3%;结节样改变对于预测Hp阳性其特异性可高达99.9%,阳性预测值高达92.3%。消化性溃疡、增生性息肉、黏膜萎缩及线状红斑对于预测Hp感染的特异性分别为90.8%、98.2%、86.3%及85.1%,阳性预测值分别为78.3%、71.4%、80.4%及75%。 结论(1)RE、RAC、胃底腺息肉为Hp阴性的独立的胃镜下黏膜征象;消化性溃疡、点状发红、结节样改变、黏膜水肿、黏膜萎缩、线状红斑、斑片状发红、胃窦部隆起型糜烂为Hp阳性独立的胃镜下黏膜征象;(2)RAC、黏膜点状发红预测Hp感染与C14呼气试验结果的符合率较高。结节样改变、黏膜萎缩、消化性溃疡、胃窦部隆起型糜烂、线状红斑作为预测Hp感染的表现有较大价值;黏膜水肿、皱襞肿大、增生性息肉、黏膜出血、斑片状发红作为单独诊断Hp阳性的指标不推荐;胃底腺息肉对于预测Hp阴性有较大价值;RE作为单独诊断Hp阴性的指标不推荐。     

Contribution of the gastrointestinal tract below the stomach to the C-urea breath test

BACKGROUND: Graham et al. [Lancet, I (1987) 1174] found a late increase of 13C enrichment in the 13C-urea breath test 120 min after administration of labeled urea to patients without Helicobacter pylori infection. This may give false positive results. AIM: We designed this study to elucidate the contribution of the gastrointestinal tract below the stomach to the 13C-urea breath test. PATIENTS: Twenty-eight patients with dyspeptic symptoms who gave their consent were enrolled. METHODS: Patients underwent the 13C-urea breath tests both via the mouth (as usual) and the duodenum (labeled urea introduced to the second portion). Breath samples were collected at baseline, 5, 15, 30, 45, 60, 90, 120, 150 and 180 min for analysis. H. pylori status was defined by the CLOtest and by histological examination. RESULTS: There was no late increase in 13C enrichment of 13C-urea breath test for eight H. pylori negative patients either via the mouth or the duodenum. For those H. pylori positive patients, seventeen had no late rise 13C enrichment of the 13C-urea breath test via the duodenum and three patients had a rise after 15 min. CONCLUSIONS: No late rise in 13CO2 excretion to cause a positive 13C-urea breath test up to 180 min after the administration of labeled urea was found in the present study.