Endoscopic implantation of polymethylmethacrylate augments the gastroesophageal antireflux barrier: a short-term study in a porcine model.

BACKGROUND AND AIMS: Endoscopic injection of filler agents into the esophagogastric junction has been developed to augment the antireflux barrier and decrease gastroesophageal reflux (GER). However, evidence of efficacy is lacking and serious complications have been reported in humans. The aim of this study was to assess whether endoscopic implantation of polymethylmethacrylate augments the antireflux barrier in a porcine model for GER. METHODS: Large White pigs underwent esophageal manometry, gastric yield pressure (GYP), and gastric yield volume (GYV) measurements and implantation of PMMA in the distal esophagus under general anesthesia. After follow-up of 28 days, esophageal manometry and gastric yield measurements were repeated and animals sacrificed. RESULTS: Implantation of PMMA was performed in 18 animals, and 14 animals survived 28 days. There was a significant increase in GYP (10.7 mmHg versus 8.1 mmHg; p = 0.017) and GYV (997 ml versus 393 ml; p < 0.001) after PMMA implantation, whereas resting LES pressure did not change significantly. Acute inflammatory changes and fibrous tissue deposits were found surrounding the PMMA implants during histology. One animal died after esophageal perforation and three others due to pneumonia (two) and colon perforation (one) in the postoperative period. CONCLUSIONS: Endoscopic implantation of PMMA in the distal esophagus augments the antireflux barrier 28 days after the procedure. However, esophageal perforation points to the need for technical refinements to make the procedure safer.

Polymorphisms of GSTP1 and GSTT1, but not of CYP2A6, CYP2E1 or GSTM1, modify the risk for esophageal cancer in a western population.

Esophageal cancer is among the most common and fatal tumors in the world. Eighty percent of esophageal tumors are esophageal squamous cell carcinoma (ESCC). Brazil is one of the high incidence areas in the West, where tobacco and alcohol consumption have been associated with ESCC. However, polymorphisms in xenobiotic metabolizing genes may also contribute to the risk. Therefore, in this study, we analyzed the risk of ESCC associated with tobacco and alcohol consumption and with polymorphisms of CYP2A6 (CYP2A6*2), CYP2E1 (CYP2E1*5B, CYP2E1*6), GSTP1 (Ile105Val), GSTM1 and GSTT1 null genotypes in 126 cases and 252 age- and gender-matched controls. Data on the amount, length and type of tobacco and alcohol consumed were collected, and DNA was extracted from blood lymphocytes from all individuals. Polymorphisms were analyzed by polymerase chain reaction (PCR)-multiplex (GSTM1 and T1), PCR-Restriction Fragment Length Polymorphism (CYP2E1*5B and *6 and GSTP1 Ile105Val) or allele-specific PCR amplification (CYP2A6*2). Risks were evaluated by multivariate conditional regression analysis. As expected, tobacco [odds ratio (OR) = 6.71, 95% confidence interval (95% CI) 3.08-14.63] and alcohol (OR = 16.98, CI 7.8-36.98) consumption, independently or together (OR = 26.91, CI 13.39-54.05) were risk factors. GSTP1 Ile105Val polymorphism was an independent risk factor (OR = 2.12, CI 1.37-3.29), whereas GSTT1 wild-type was an independent protective factor for ESCC (OR = 0.37, CI 0.16-0.79). There was approximately 80% statistical power to detect both results. There was no risk associated with CYP2A6, CYP2E1 and GSTM1 polymorphisms. In conclusion, this study suggests an opposite role of GSTP1 and GSTT1 polymorphisms for the risk for ESCC.

Contribution of standard oesophageal manometry in sliding hiatal hernia: from the gastro-oesophageal pressure gradient to the diagnosis.

OBJECTIVE: We tested whether gastro-oesophageal pressure gradient is augmented in sliding hiatal hernia and the yield of oesophageal manometry in diagnosing sliding hiatal hernia. METHODS: Patients with equivalent body mass index were categorised according to manometry and endoscopy in groups: (1) no sliding hiatal hernia (n=147); (2) sliding hiatal hernia solely at endoscopy (n=46); and (3) sliding hiatal hernia at manometry (n=22). The yield of manometry was assessed taking endoscopy as referential. RESULTS: Gastro-oesophageal pressure gradient was similar between groups both at inspiration (13.3+/-5.7 mm Hg vs. 13.6+/-5.4 mm Hg vs. 12.6+/-4.4 mm Hg; P=0.874) or expiration (5.1+/-3.8 mm Hg vs. 5.2+/-3.6 mm Hg vs. 5.1+/-3.7 mm Hg; P=0.767). Group 3 patients were older than those of groups 1 and 2 (59+/-10 vs. 42+/-15 vs. 45+/-13 years; P<0.001). Sliding hiatal hernia was larger when characterised by manometry than at endoscopy [4 cm (2.25-4.75) vs. 2 cm (2-3); P<0.001]. Manometry showed sensitivity of 28% (95%CI 19-40%), specificity of 97% (95%CI 93-99%) and positive predictive value of 82% (95%CI 63-92%) in diagnosing sliding hiatal hernia. CONCLUSIONS: By using manometry in patients with equivalent body mass index, sliding hiatal hernia presence and size are related with age rather than gastro-oesophageal pressure gradient. This technique may be clinically useful when positive for sliding hiatal hernia.

Nutcracker oesophagus: association with chest pain and dysphagia controlling for gastro-oesophageal reflux.

BACKGROUND: The association between nutcracker oesophagus, gastro-oesophageal reflux and their symptoms is controversial. AIM: To evaluate the association of nutcracker oesophagus with chest pain and dysphagia controlling for gastro-oesophageal reflux. METHODS: From a database of 935 consecutive patients investigated with oesophageal manometry and pH-metry, we selected all patients with nutcracker oesophagus including diffuse and segmental patterns. Patients with normal oesophageal peristalsis served as controls. Symptoms assessment, manometry testing and 24h oesophageal pH monitoring off acid-suppressive medications were performed following a standardized protocol. The associations between nutcracker oesophagus and symptoms were assessed by logistic regression analysis. RESULTS: Nutcracker oesophagus was found in 60 patients (6.4%), of which 30 had diffuse nutcracker oesophagus and 30 had segmental nutcracker oesophagus. The control group was composed by 656 patients with normal oesophageal peristalsis. Diffuse nutcracker oesophagus was associated with chest pain (odds ratio 4.3; 95% CI 1.9-9.9; P<0.0001) and dysphagia (odds ratio 5.3; 95% CI 2.3-12.2; P<0.0001), whereas segmental nutcracker oesophagus was associated with chest pain (odds ratio 2.8; 95% CI 1.1-6.9; P=0.026), controlling for total oesophageal acid exposure, age, sex and lower oesophageal sphincter (LOS) pressure. CONCLUSION: This study suggests that both diffuse and segmental nutcracker oesophagus should be regarded as meaningful abnormalities and not mere manometric curiosities.

Percepçäo e registro de abuso de álcool e de doenças relacionadas num hospital geral universitário / Perception and registration of alcohol abuse and alcohol related diseases by nurses and medical staff of an university general hospital

Objetivo. Avaliar a associaçao entre o resultado do teste CAGE aplicado em pacientes internados num hospital geral universitário (Hospital de Clínicas de Porto ALegre - HCPA) e a percepçao e registro de abuso de álcool e de doenças relacionadas pelas equipes de saúde. Pacientes e Métodos. O delineamento envolveu três fases: a) aplicaçao do teste CAGE aos 385 pacientes adultos e adolescentes internados considerados elegíveis para o estudo; b) revisao dos prontuários dos pacientes CAGE-positivo e de um número igual de pacientes CAGE-negativo, estratificados por área de internaçao e sorteados, para identificar hábitos alcoólicos e a presença de doenças relacionadas ao uso de álcool; c) entevista com os membros das equipes médicas responsáveis para avaliar sua percepçao sobre o hábito alcoólico em seu paciente. As diferenças encontradas foram analisadas através do teste Qui-quadrado e do teste t de Student, com significância estatística em nível de 5 por cento bicaudal. Resultados. Foram encontrados 51 pacientes CAGE-positivo (13 por cento). A equipe médica registrou abuso de álcool no prontuário de 51 por cento dos pacientes CAGE-positivo e 10 por cento dos CAGE-negativo, e a equipe de enfermagem fez este registro no prontuário de 31 por cento dos pacientes CAGE-positivo e 8 por cento dos CAGE-negativo (p=.724). Nao houve diferença entre o registro e a percepçao da equipe médica (p=.184). A prevalência de doenças relacionadas ao abuso de álcool foi 27 por cento quando se examinou os prontuários médicos e 26 por cento quando se entrevistou a equipe médica (p=.861), sendo maior entre os pacientes CAGE-poistivo (43 por cento) do que entre os CAGE-negativo (10 por cento) (p=.0003). Conclusoes. O abuso de bebidas alcoólicas e a presença de doenças associadas ao mesmo sao condiçoes prevalentes nos pacientes admitidos ao HCPA. Entretanto, mais de metade dos casos nao foram detectados pela equipe de saúde, havendo correspondência entre os registros de prontuário e a entrevista.

Hepatitis C virus genotypes in Southern Brazil

The prevalence of hepatitis C virus (HCV) genotypes in Southern Brazil was studied in the plasma of 100 HCV-RNA-positive patients attended in Porto Alegre, South of Brazil. Reverse transcriptionpolymerase chain reaction (RT-PCR) products from the 5' noncoding region were double digested with RsaI-HaeIII and BstNI-HinfI and analyzed by restriction fragment length polymorphism (RFLP). Three genotypes (1, 2 and 3) were demonstrable, the most prevalent being HCV type 1 (55 of 100 patients, 55 per cent), followed by HCV type 3 (37 of 100 patients, 37 per cent) and HCV type 2 (8 of 100 patients, 8 per cent). There was an unusual high prevalence of genotype 3, in contrast to the majority of published data from the Southeast region.