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1.
Endoscopy ; 54(1): 16-24, 2022 01.
Artigo em Inglês | MEDLINE | ID: mdl-33395714

RESUMO

BACKGROUND: Endoscopic resection of lesions involving the appendiceal orifice remains a challenge. We aimed to report outcomes with the full-thickness resection device (FTRD) for the resection of appendiceal lesions and identify factors associated with the occurrence of appendicitis. METHODS: This was a retrospective study at 18 tertiary-care centers (USA 12, Canada 1, Europe 5) between November 2016 and August 2020. Consecutive patients who underwent resection of an appendiceal orifice lesion using the FTRD were included. The primary outcome was the rate of R0 resection in neoplastic lesions, defined as negative lateral and deep margins on post-resection histologic evaluation. Secondary outcomes included the rates of: technical success (en bloc resection), clinical success (technical success without need for further surgical intervention), post-resection appendicitis, and polyp recurrence. RESULTS: 66 patients (32 women; mean age 64) underwent resection of colonic lesions involving the appendiceal orifice (mean [standard deviation] size, 14.5 (6.2) mm), with 40 (61 %) being deep, extending into the appendiceal lumen. Technical success was achieved in 59/66 patients (89 %), of which, 56 were found to be neoplastic lesions on post-resection pathology. Clinical success was achieved in 53/66 (80 %). R0 resection was achieved in 52/56 (93 %). Of the 58 patients in whom EFTR was completed who had no prior history of appendectomy, appendicitis was reported in 10 (17 %), with six (60 %) requiring surgical appendectomy. Follow-up colonoscopy was completed in 41 patients, with evidence of recurrence in five (12 %). CONCLUSIONS: The FTRD is a promising non-surgical alternative for resecting appendiceal lesions, but appendicitis occurs in 1/6 cases.


Assuntos
Apêndice , Ressecção Endoscópica de Mucosa , Colonoscopia , Feminino , Humanos , Pessoa de Meia-Idade , Estudos Retrospectivos , Resultado do Tratamento
2.
Endoscopy ; 52(1): 68-72, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31614372

RESUMO

BACKGROUND: Rectal neuroendocrine tumors (NETs) are subepithelial tumors with potential for malignancy. Depending on tumor characteristics, endoscopic or surgical resection is recommended. However, the optimal endoscopic approach is not defined. This is the first larger study evaluating endoscopic full-thickness resection (EFTR) of rectal NETs. METHODS: For resection, the full-thickness resection device (FTRD) was used. A registry was created as part of post-market clinical follow-up. All cases of rectal NETs in the registry were analyzed retrospectively. RESULTS: 31 German centers entered data of 501 FTRD procedures and 40 cases of rectal NETs were identified. The median lesion size was 8 mm. All lesions could be resected using FTRD. The median procedure time was 18.5 minutes. Resection was macroscopically and histologically complete in all cases. Full-thickness resection was achieved in 95 %. No major adverse events occurred. Endoscopic follow-up showed no evidence of residual or recurrent tumor. CONCLUSION: EFTR is safe and effective for resection of smaller rectal NETs. Prospective comparative trials are needed to define the role of EFTR of rectal NETs.


Assuntos
Tumores Neuroendócrinos , Reto , Humanos , Recidiva Local de Neoplasia , Tumores Neuroendócrinos/cirurgia , Estudos Prospectivos , Reto/cirurgia , Estudos Retrospectivos , Resultado do Tratamento
3.
Z Gastroenterol ; 57(4): 473-483, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30965377

RESUMO

BACKGROUND AND AIMS: This study examined differences in personality, psychological distress, and stress coping in inflammatory bowel disease (IBD) depending on type of disease and disease activity. We compared patients suffering from Crohn's disease (CD) and ulcerative colitis (UC) with controls. While the literature is replete with distinctive features of the pathogenesis of IBD, the specific differences in psychological impairments are not well studied. METHODS: In this German national multicenter study, participants were recruited from 32 centers. Two hundred ninety-seven questionnaires were included, delivering vast information on disease status and psychological well-being based on validated instruments with a total of 285 variables. RESULTS: CD patients were more affected by psychological impairments than patients suffering from UC or controls. Importantly, patients with active CD scored higher in neuroticism (p < 0.01), psychological distress (p < 0.001) and maladaptive stress coping (escape, p = 0.03; rumination, p < 0.03), but less need for social support (p = 0.001) than controls. In contrast, patients suffering from active UC showed psychological distress (p < 0.04) and maladaptive coping (avoidance, p < 0.03; escape, p = 0.01). Patients in remission seemed to be less affected. In particular, patients with UC in remission were not inflicted by psychological impairments. The group of CD patients in remission however, showed insecurity (p < 0.01) and paranoid ideation (p = 0.04). CONCLUSIONS: We identified specific aspects of psychological impairment in IBD depending on disease and disease activity. Our results underscore the need for psychological support and treatment particularly in active CD.


Assuntos
Adaptação Psicológica , Colite Ulcerativa/psicologia , Doença de Crohn/psicologia , Pacientes/psicologia , Estresse Psicológico , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Personalidade , Qualidade de Vida , Índice de Gravidade de Doença , Inquéritos e Questionários , Adulto Jovem
4.
J Clin Gastroenterol ; 50(10): e91-e94, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27035080

RESUMO

BACKGROUND: Recent studies have analyzed the potential of advanced endoscopic imaging techniques for differentiating hyperplastic and adenomatous colorectal lesions. Latest endoscopic resection techniques now also allow for treatment of more advanced staged lesions including treatment of early cancerous lesions. AIMS: To assess the potential of the i-scan technology to differentiate between adenomatous polyps and advanced staged neoplasia. METHODS: Consecutive patients undergoing colonoscopy at a tertiary referral center were included. After a dedicated training, participating endoscopists underwent a review of 298 unknown images of colonic lesions to assess colorectal lesion histology. RESULTS: Overall accuracy for prediction of advanced staged neoplasia was 92.2% (sensitivity: 94.2%, specificity 90.9%). The positive and negative predictive values were calculated as 87.5% and 95.9%, respectively. The κ-value for differentiating adenomatous polyps and advanced staged neoplasia was 0.8193 (0.7894 to 0.8492). Intraobserver agreement was calculated with a κ-value of 0.9301 (0.8875 to 0.9727). CONCLUSIONS: Accurate interpretation of i-scan images for prediction of advanced colorectal neoplasia can successfully be performed even by nonexpert endoscopists with a high overall accuracy and excellent interobserver agreements.


Assuntos
Colo/patologia , Neoplasias Colorretais/patologia , Hiperplasia/patologia , Pólipos do Colo/patologia , Colonoscopia/métodos , Feminino , Alemanha , Humanos , Aumento da Imagem , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes
5.
BMC Gastroenterol ; 15: 41, 2015 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-25888445

RESUMO

BACKGROUND: Patients with gastrointestinal food allergy are characterised by increased production of mast cell derived mediators upon allergen contact and present often with unspecific symptoms. The aim of this study was to evaluate urinary histamine and methylhistamine excretion in patients with food allergy and to compare their values with food-tolerant controls. METHODS: In a retrospective case control study the urinary excretion parameters were analysed from 56 patients (40.9, 19 - 58 years) in whom later food challenge tests confirmed food allergy. During their diagnostic work-up urine was collected during a 12-h period under an unrestricted diet with staple foods and a hypoallergenic potato-rice-diet (each 2 days). Healthy controls underwent the same diet types to define normal excretion parameters. Urinary histamine and n-methylhistamine were determined by ELISA or tandem mass spectrometry, respectively, and were expressed as median (25 - 75% range, µg/mmol creatinine x m(2)BSA). RESULTS: During unrestricted diet urinary histamine was significantly higher in gastrointestinal food allergy than healthy controls (1.42, 0.9 - 2.7 vs 0.87, 0.4 - 1.3; p < 0.0001), while the difference between both groups became marginal during potato-rice diet (1.30, 0.7 - 2.1 vs 1.05, 0.5 - 1.5; p = 0.02). N-methylhistamine was found to be significantly elevated in gastrointestinal food allergy both during unrestricted diet (7.1, 5.0 - 11.2) and potato-rice diet (5.7, 3.7 - 8.7) compared to controls (p < 0.0001). Interestingly, urinary methylhistamine excretion (p < 0.004) and clinical symptom score (p < 0.02) fell significantly when the diet was switched from unrestricted to hypoallergenic food, but was not correlated with symptom scores. CONCLUSIONS: In gastrointestinal food allergy significantly higher levels of urine histamine and methylhistamine excretion were found under unrestricted diet, reflecting an increased secretion of histamine due to offending foods. Measurement of urinary n-methylhistamine levels may help to find out patients with increased histamine production and/or food-allergen induced clinical symptoms, respectively.


Assuntos
Alérgenos/administração & dosagem , Dieta , Hipersensibilidade Alimentar/urina , Gastroenteropatias/urina , Histamina/urina , Metilistaminas/urina , Adolescente , Adulto , Idoso , Alérgenos/efeitos adversos , Estudos de Casos e Controles , Feminino , Alimentos/efeitos adversos , Hipersensibilidade Alimentar/etiologia , Humanos , Masculino , Pessoa de Meia-Idade , Oryza/imunologia , Estudos Retrospectivos , Solanum tuberosum/imunologia , Adulto Jovem
6.
Digestion ; 89(2): 105-9, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24503572

RESUMO

BACKGROUND/AIMS: Longtime chronic malabsorption may among other things cause a lack of liposoluble vitamins. Vitamin E deficiency can lead to formation of lipofuscin aggregates. Its deficiency is also associated with an increased lipofuscinosis of the bowel, i.e. brown bowel syndrome. METHODS: Systematic research via Medline on brown bowel syndrome, lipofuscinosis, and vitamin E deficiency was performed. We combined our own clinical experience and a review of the literature for this paper. Its goal is to inform about the possible consequences of severe malabsorption and brown bowel syndrome. RESULTS: Systematic data about the occurrence of severe malabsorption and brown bowel syndrome are rare. Only about 27 scientific reports can be found on this subject. Brown bowel syndrome is found mostly in conjunction with vitamin E deficiency and lipofuscinosis of the bowel. The clinical findings are caused by both malabsorption and lipofuscinosis. Case reports show a therapeutic effect of vitamin E. CONCLUSION: Vitamin deficiency caused by longtime chronic malabsorption can lead to the development of brown bowel syndrome, which is seen as the expression of lipofuscinosis of the bowel, and can cause further clinical disorders. Patients with malabsorption should therefore be monitored regarding their vitamin E levels.


Assuntos
Lipofuscina/metabolismo , Síndromes de Malabsorção/complicações , Deficiência de Vitamina E/etiologia , Doença Crônica , Neoplasias Gastrointestinais/complicações , Humanos , Vitamina E/sangue , Vitamina E/uso terapêutico , Deficiência de Vitamina E/diagnóstico , Deficiência de Vitamina E/tratamento farmacológico , Deficiência de Vitamina E/metabolismo
7.
Med Ultrason ; 24(4): 399-405, 2022 Dec 21.
Artigo em Inglês | MEDLINE | ID: mdl-36546433

RESUMO

AIMS: Technique-related factors, patient-related factors, and localization determine the risk for complications in percutaneous endoscopic gastrostomy (PEG) tube placement. The objective of this study was to identify patient characteristics and ultrasonographic parameters after PEG tube placement concerning localization, which correlate with complications. MATERIAL AND METHODS: Patients undergoing PEG-tube placement were examined by abdominal ultrasound after dismissal from the endoscopic recovery room. Patient demographics, PEG characteristics, ultrasonographic parameters and complications were retrospectively analyzed. RESULTS: Of 64 enrolled patients, 59.4% were male and the mean age was 62.3 years. A significant negative correlation between complications at PEG placement and Body-Mass-Index (BMI; kg/m2) was observed (Spearman's Rho: -0.382; p=0.002). A low BMI <18 tended to be more frequent in the group with complication-related PEG removal compared to patients without (18.2% vs. 1.9%). Further descriptive analysis revealed that 4 patients (36.4% of N=11) with and 5 patients (9.4% of N=53) without PEG removal due to complications already had complications at the time of PEG placement. Of the patients with complications during follow-up, those with a peritoneal course (N=10) in ultrasound tended to have a lower BMI (mean ± standard deviation: 22.5±6.5 vs. 26.8±5.9) compared to those without (N=5). In all 4 patients with a triad of follow-up complications, peritoneal course, and complications at PEG placement, the tube was removed due to complications. CONCLUSIONS: Post-PEG-placement ultrasonography can help to determine complications in specific procedure-related conditions. A low BMI was found to be a relevant predictor of PEG-related complications, substantiating the need for early intervention in potentially PEG-relevant indications.


Assuntos
Nutrição Enteral , Gastrostomia , Humanos , Masculino , Pessoa de Meia-Idade , Feminino , Gastrostomia/efeitos adversos , Nutrição Enteral/efeitos adversos , Estudos Retrospectivos
8.
Med Sci Monit ; 17(3): CS29-33, 2011 Feb 25.
Artigo em Inglês | MEDLINE | ID: mdl-21358608

RESUMO

BACKGROUND: Endoscopic treatment of advanced biliary disorders and their complications following surgical procedures is often difficult especially after Billroth II gastric resection. In such cases, endoscopic access to the papilla and neopapilla is often low, and access to the choledocho- or hepaticojejunostomy is often difficult. Thus, percutaneous cholangiodrainage or re-operation is therefore indicated when endoscopic access to the papilla failed. But both of those methods are much more invasive and more likely to be followed by complications than use of a purely endoscopic approach. CASE REPORT: The present case report describes endoscopic access to the papilla with both push enteroscopy and double-balloon enteroscopy (DBE, push-and-pull enteroscopy) in a female patient after Billroth II resection with bile leakage following cholecystectomy. Successful closure of the bile duct fistula could be achieved via an unusual abdominal-biliary-jejunal cannulation way after several attempts of modern enteroscopy and in this way re-operation was avoided. CONCLUSIONS: Modern enteroscopy by experienced investigators using push-and-pull enteroscopes can provide access to the papilla even in complex postoperative anatomic rearrangements. Push-and-pull enteroscopes offer a further option for successful cannulation of the papilla and therapeutic interventions via additional stabilization with balloons and the modern enteroscopic approach by push-and-pull enteroscopy appears to provide more patient comfort, requires less analgo-sedation and examination time and in cases with intra-abdominal drainage this external access may be used as an additional aid for exploration and intervention in complex individual cases with extremely difficult treatable bile duct injuries.


Assuntos
Doenças dos Ductos Biliares/etiologia , Doenças dos Ductos Biliares/terapia , Ductos Biliares/cirurgia , Enteroscopia de Duplo Balão/efeitos adversos , Gastroenterostomia/efeitos adversos , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/terapia , Idoso , Ductos Biliares/patologia , Cateterismo , Meios de Contraste , Feminino , Humanos , Resultado do Tratamento
9.
Med Sci Monit ; 17(5): CR248-58, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21525806

RESUMO

BACKGROUND: The aim of this retrospective study was to evaluate the efficacy and safety of weekly high-dose 5-fluorouracil (5-FU)/folinic acid (FA) as 24-h infusion (AIO regimen) plus irinotecan in patients with histologically proven metastatic gastroesophageal adenocarcinoma (UICC stage IV). MATERIAL/METHODS: From 08/1999 to 12/2008, 76 registered, previously untreated patients were evaluable. Treatment regimen: irinotecan (80 mg/m²) as 1-h infusion followed by 5-FU (2000 mg/m²) combined with FA (500 mg/m²) as 24-h infusion (d1, 8, 15, 22, 29, 36, qd 57). RESULTS: Median age: 59 years; male/female: 74%/26%; ECOG ≤1: 83%; response: CR: 1%, PR: 16%, SD: 61%, PD: 17%, not evaluable in terms of response: 5%; tumor control: 78%; median OS: 11.2 months; median time-to-progression: 5.3 months; 1-year survival rate: 49%; 2-year survival rate: 17%; no evidence of disease: 6.6%; higher grade toxicities (grade 3/4): anemia: 7%, leucopenia: 1%, ascites: 3%, nausea: 3%, infections: 12%, vomiting: 9%, GI bleeding of the primary tumor: 4%, diarrhea: 17%, thromboembolic events: 4%; secondary metastatic resection after downsizing: 16 patients (21%), R-classification of secondary resections: R0/R1/R2: 81%/6%/13%, median survival of the 16 patients with secondary resection: 23.7 months. CONCLUSIONS: Combined 5-FU/FA as 24-h infusion plus irinotecan may be considered as an active palliative first-line treatment accompanied by tolerable toxicity; thus offering an alternative to cisplatin-based treatment regimens. Thanks to efficient interdisciplinary teamwork, secondary metastatic resections could be performed in 16 patients. In total, the patients who had undergone secondary resection had a median survival of 23.7 months, whereas the median survival of patients without secondary resection was 10.1 months (p≤0.001).


Assuntos
Camptotecina/análogos & derivados , Neoplasias Esofágicas/secundário , Junção Esofagogástrica/patologia , Fluoruracila/uso terapêutico , Leucovorina/uso terapêutico , Cuidados Paliativos , Neoplasias Gástricas/secundário , Adenocarcinoma/diagnóstico por imagem , Adenocarcinoma/secundário , Adenocarcinoma/cirurgia , Adulto , Idoso , Antineoplásicos/administração & dosagem , Antineoplásicos/efeitos adversos , Antineoplásicos/uso terapêutico , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Camptotecina/administração & dosagem , Camptotecina/efeitos adversos , Camptotecina/uso terapêutico , Relação Dose-Resposta a Droga , Esquema de Medicação , Neoplasias Esofágicas/diagnóstico por imagem , Neoplasias Esofágicas/cirurgia , Feminino , Fluoruracila/administração & dosagem , Fluoruracila/efeitos adversos , Humanos , Infusões Intravenosas , Irinotecano , Estimativa de Kaplan-Meier , Leucovorina/administração & dosagem , Leucovorina/efeitos adversos , Masculino , Pessoa de Meia-Idade , Prognóstico , Cintilografia , Neoplasias Gástricas/diagnóstico por imagem , Neoplasias Gástricas/cirurgia , Resultado do Tratamento
10.
Med Sci Monit ; 16(2): CR49-55, 2010 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-20110914

RESUMO

BACKGROUND: In 2003 Wein et al. published data after a short median follow up (23 months). Here we report on the long-term results. MATERIAL/METHODS: The patients (n=20) received a neoadjuvant treatment regimen comprising biweekly 85 mg/m2 oxaliplatin (L-OHP) (2h-infusion, d 1, 15, 29 qd 57) and 500 mg/m2 calcium folinic acid (FA) (1-2h-infusion, d 1, 8, 15, 22, 29, 36 qd 57) followed by 2600 mg/m2 5-Fluorouracil (5-FU) (24h-infusion, d 1, 8, 15, 22, 29, 36 qd 57). Two cycles of chemotherapy were administered, with a third being added when the treatment was well tolerated. Thereafter, curative resection of the liver metastases was attempted. RESULTS: After neoadjuvant therapy, imaging procedures revealed complete remission in 2 patients (10%) and partial remission in 18 patients (90%). Diarrhea (Common Toxicity Criteria toxicity grade 3) was observed in 6 patients (30%) as main symptom of toxicity, followed by vomiting in 3 patients (15%). Higher grade sensomotoric neuropathy did not present. The curative resectability rate (R0) was 80%. In 9 out of 18 patients (50%) undergoing surgical intervention minor postoperative complications occurred. No postoperative mortality was observed. Over a median follow up of 45,5 months the median survival of all patients is 3.0 years and the 5-year overall survival rate is 40%. The 5-year disease-free survival rate is 25%. CONCLUSIONS: Neoadjuvant treatment with 5-FU combined with FA and L-OHP proved to be highly effective and well tolerated. Disease-free survival rates and median overall survival rates are promising.


Assuntos
Antineoplásicos/uso terapêutico , Neoplasias Colorretais/patologia , Fluoruracila/uso terapêutico , Leucovorina/uso terapêutico , Neoplasias Hepáticas/tratamento farmacológico , Neoplasias Hepáticas/secundário , Compostos Organoplatínicos/uso terapêutico , Idoso , Antineoplásicos/administração & dosagem , Antineoplásicos/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Relação Dose-Resposta a Droga , Esquema de Medicação , Feminino , Fluoruracila/administração & dosagem , Fluoruracila/efeitos adversos , Humanos , Bombas de Infusão Implantáveis , Estimativa de Kaplan-Meier , Leucovorina/administração & dosagem , Leucovorina/efeitos adversos , Neoplasias Hepáticas/mortalidade , Neoplasias Hepáticas/cirurgia , Masculino , Pessoa de Meia-Idade , Terapia Neoadjuvante , Recidiva Local de Neoplasia/tratamento farmacológico , Compostos Organoplatínicos/administração & dosagem , Compostos Organoplatínicos/efeitos adversos , Oxaliplatina , Cooperação do Paciente , Fatores de Tempo
11.
Med Sci Monit ; 16(3): CR124-131, 2010 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-20190682

RESUMO

BACKGROUND: The aim of this study was to evaluate the efficacy and toxic side effects of combined gemcitabine plus weekly high-dose 5-Fluorouracil (5-FU) as 24h-infusion in patients with metastatic pancreatic cancer (UICC IV) as validation group of an earlier phase II study. Primary endpoints were to assess the response and tumour control rate. MATERIAL/METHODS: This study comprised 60 prospectively registered patients with metastatic pancreatic cancer (UICC IV). A locally advanced disease was defined as exclusion criteria. The treatment schedule was weekly gemcitabine (1.000 mg/m(2)) as a 0.5h-infusion combined with 5-FU (2.000 mg/m(2)) as a 24h-infusion on day 1, 8 and 15 every 28 days. RESULTS: Response rate (CR+PR) was achieved in 7% of the patients, tumour control rate (CR+PR+SD) was achieved in 59%. Median time-to-progression was 4 months, median overall survival was 7.3 months (95% CI 5.4-9.1). The median survival of patients with normal CEA value was 10.6 months (95% CI 7.8-13.4); with a normal CA 19-9 median survival was 10.1 months (95% CI 4.6-15.7) and with ECOG performance status 0 median survival was 10.1 months (95% CI 8.6-15.3). As higher grade toxicity (grade 3/4) leukopenia (15%), anaemia (10%) and thrombopenia (5%) were observed. Nausea and diarrhea (grade 3/4) occurred in 5% of the patients and vomiting in 2%. CONCLUSIONS: The administration of gemcitabine and 5-FU as a 24h-infusion is feasible and offers good tumour control rate accompanied by tolerable toxicity. The subgroup of patients with a good performance status (ECOG 0) and tumour markers within the normal range benefit from the gemcitabine combination therapy.


Assuntos
Antineoplásicos/uso terapêutico , Desoxicitidina/análogos & derivados , Fluoruracila/administração & dosagem , Fluoruracila/uso terapêutico , Cuidados Paliativos , Neoplasias Pancreáticas/tratamento farmacológico , Adulto , Idoso , Antineoplásicos/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/administração & dosagem , Protocolos de Quimioterapia Combinada Antineoplásica/efeitos adversos , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Biomarcadores Tumorais/metabolismo , Antígeno Carcinoembrionário/metabolismo , Ensaios Clínicos Fase II como Assunto , Desoxicitidina/administração & dosagem , Desoxicitidina/efeitos adversos , Desoxicitidina/uso terapêutico , Relação Dose-Resposta a Droga , Esquema de Medicação , Feminino , Fluoruracila/efeitos adversos , Humanos , Infusões Intravenosas , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Metástase Neoplásica , Prognóstico , Fatores de Tempo , Resultado do Tratamento , Estados Unidos , Gencitabina
12.
Sci Rep ; 10(1): 3546, 2020 02 26.
Artigo em Inglês | MEDLINE | ID: mdl-32103066

RESUMO

Hyper spectral imaging is a possible way for disease detection. However, for carcinoma detection most of the results are ex-vivo. However, in-vivo results of endoscopic studies still show fairly low accuracies in contrast to the good results of many ex-vivo studies. To overcome this problem and to provide a reasonable explanation, Monte-Carlo simulations of photon trajectories are proposed as a tool to generate multi spectral images including inter patient variations to simulate 40 patients. Furthermore, these simulations have the huge advantage that the position of the carcinoma is known. Due to this, the effect of mislabelled data can be studied. As shown in this study, a percentage of 30-35% of mislabelled data might lead to significant decrease of the accuracy from around 90% to around 70-75%. Therefore, the main focus of hyper spectral imaging has to be the exact characterization of the training data in the future.


Assuntos
Endoscopia , Análise Espectral , Trato Gastrointestinal Superior/anatomia & histologia , Trato Gastrointestinal Superior/patologia , Endoscopia/métodos , Endoscopia/normas , Análise Fatorial , Humanos , Método de Monte Carlo , Especificidade de Órgãos , Reprodutibilidade dos Testes , Análise Espectral/métodos , Análise Espectral/normas
15.
Sci Rep ; 9(1): 7512, 2019 05 17.
Artigo em Inglês | MEDLINE | ID: mdl-31101855

RESUMO

Automatic carcinoma detection from hyper/multi spectral images is of essential importance due to the fact that these images cannot be presented directly to the clinician. However, standard approaches for carcinoma detection use hundreds or even thousands of features. This would cost a high amount of RAM (random access memory) for a pixel wise analysis and would slow down the classification or make it even impossible on standard PCs. To overcome this, strong features are required. We propose that the spectral-spatial-variation (SSV) is one of these strong features. SSV is the residuum of the three dimensional hyper spectral data cube minus its approximation with a fitting in a small volume of the 3D image. By using it, the classification results of carcinoma detection in the stomach with multi spectral imaging will be increase significantly compared to not using the SSV. In some cases, the AUC can be even as high as by the usage of 72 spatial features.


Assuntos
Diagnóstico por Computador/métodos , Análise Espectral/métodos , Neoplasias Gástricas/diagnóstico por imagem , Adenocarcinoma/diagnóstico , Adenocarcinoma/diagnóstico por imagem , Idoso , Idoso de 80 Anos ou mais , Diagnóstico por Computador/estatística & dados numéricos , Feminino , Gastroscopia , Humanos , Interpretação de Imagem Assistida por Computador/métodos , Interpretação de Imagem Assistida por Computador/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Razão Sinal-Ruído , Análise Espectral/estatística & dados numéricos , Neoplasias Gástricas/diagnóstico
16.
Biomed Opt Express ; 10(2): 807-816, 2019 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-30800516

RESUMO

Laser surgery provides clean, fast and accurate cutting of tissue. However, it is difficult to detect what kind of tissue is being cut. Therefore, a wrong cut may lead to iatrogenic damage of structures. A feedback system should automatically stop the cutting process when a nerve is reached or accidentally being cut to prevent its damage. This could increase the applicability and safety of using a laser scalpel in surgical procedures. In this study, random lasing (RL) is used to differentiate between skin, fat, muscle and nerve tissue. Among these tissue types, a special emphasis is made on the differentiation of nerve from the rest of the tissues, especially fat since nerve is covered by a fatty layer. The differentiation is done for ex-vivo tissues of a pig animal model. The results show that random lasing can be used to differentiate these tissue types also under room light conditions in open air.

17.
Lab Invest ; 88(4): 387-97, 2008 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18268475

RESUMO

We investigated whether the intermediate filament protein and neural stem cell marker nestin characterizes the glomerular progenitor/reserve cell population immigrating the glomerulus after mesangial cell (MC) injury in the rat (anti-Thy1 nephritis). Nestin expression was investigated by immunohistochemistry and real-time PCR during anti-Thy1 nephritis. Migration and proliferation assays were used to characterize the function of nestin in isolated MCs after nestin knockdown by siRNA. After MC injury during anti-Thy1 nephritis, glomerular nestin was transiently increased during the repopulation phase. At the peak of mesangial proliferation and expansion (day 5) most OX-7-positive MCs expressed nestin largely colocalizing with the activation marker alpha-smooth muscle actin and the proliferation marker PCNA. In contrast to a healthy, non-injured mesangium in vivo, MCs in culture are considered to be in an 'activated, injured state' and express nestin in a generalized distribution with condensed localization around the nucleus as well as intensive staining of cell protrusions such as filopodia. During cell cycle, the percentage of MCs with high nestin levels was increased during S- aupnd G2-phase. Blocking of nestin using specific siRNA resulted in inhibition of cell proliferation but not cell migration. In conclusion, nestin is constitutively expressed in podocytes, but is a marker for repopulating MCs after experimental MC injury in vivo. Nestin promotes MC proliferation in vitro, suggesting a supporting role for nestin during repair reaction.


Assuntos
Movimento Celular/fisiologia , Proliferação de Células , Proteínas de Filamentos Intermediários/metabolismo , Células Mesangiais/metabolismo , Proteínas do Tecido Nervoso/metabolismo , Regeneração/fisiologia , Células-Tronco Adultas/metabolismo , Animais , Biomarcadores/metabolismo , Ciclo Celular/fisiologia , Regulação para Baixo , Humanos , Células Mesangiais/fisiologia , Camundongos , Nestina , Fator de Crescimento Derivado de Plaquetas/metabolismo , Podócitos/metabolismo , Ratos , Ratos Sprague-Dawley
18.
J Int Med Res ; 46(1): 168-174, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28760081

RESUMO

Objectives Vitamin C deficiency is considered extremely rare in modern industrialized countries. This study was performed to assess vitamin C concentrations in the German population. Methods As part of a consultant-patient seminar on nutrition and food intolerances, patients were asked to participate in this study on a voluntary basis. Blood samples were taken for analysis of serum vitamin C concentrations, and all patients were asked to complete a questionnaire. The vitamin C concentration was determined by high-performance liquid chromatography. Results Of approximately 300 patients attending the seminar, 188 (62.6%) consented to vitamin C blood sample analysis and 178 (59.3%) answered the questionnaire. The mean vitamin C concentration was 7.98 mg/L (range, 0.50-17.40; reference range, 5-15 mg/L). A low plasma level with vitamin C insufficiency (<5 mg/L) was found in 31 patients (17.4%), and a potential scorbutogenic deficiency (<1.5 mg/L) was found in 6 (3.3%). Conclusions Potential vitamin C insufficiency and deficiency is common. It is therefore possible, even in modern developed populations, that certain individuals may require a higher intake of vitamin C.


Assuntos
Deficiência de Ácido Ascórbico/diagnóstico , Deficiência de Ácido Ascórbico/epidemiologia , Ácido Ascórbico/sangue , Inquéritos e Questionários , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Deficiência de Ácido Ascórbico/sangue , Índice de Massa Corporal , Estudos Transversais , Feminino , Alemanha/epidemiologia , Humanos , Incidência , Masculino , Pessoa de Meia-Idade , Fatores Sexuais
19.
Dig Liver Dis ; 49(6): 647-650, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-28258930

RESUMO

BACKGROUND: For proper evaluation of capsule endoscopy (CE), a complete examination is necessary. AIM: We evaluated risk factors of an incomplete CE with focus on patient hospitalization. METHODS: We retrospectively evaluated 161 consecutive patients who underwent CE between 01.07.2013 and 13.03.2016. Main indications were active bleeding, iron deficiency anemia (IDA), inflammatory bowel disease (IBD), abdominal pain, and familial adenomatous polyposis (FAP). RESULTS: We report the results of 103 in-patients and 56 out-patients. Eighty-two patients were male, average age was 58.9 years (range 18-90). Indications for CE were active bleeding (103 patients), IDA and IBD (16 patients), and FAP, abdominal pain and others (eight examinations each). All FAP patients were out-patients, but showed the longest small bowel transit time (SBTT) of 443.6min (p=0.0001). The shortest SBTT was found in out-patients without FAP (267.5min, p<0.05). In the in-patient group, nine endoscopies did not record the entire small bowel (8.7%) due to battery depletion, compared with only one incomplete examination in the out-patients (1.8%, p=0.036). We found pathologic lesions in the last 30min of the SBTT in 43 patients, and this indicates the necessity for complete examination. Thirteen of these 43 patients showed major lesions such as ulcers or angiodysplasia in this last region alone. CONCLUSION: In-patients might require special treatment to ensure complete examination, since a considerable amount of pathologies can only be found in the ileum.


Assuntos
Endoscopia por Cápsula , Pacientes Internados , Intestino Delgado/patologia , Pacientes Ambulatoriais , Polipose Adenomatosa do Colo/diagnóstico , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Anemia Ferropriva/diagnóstico , Angiodisplasia/patologia , Feminino , Alemanha , Hemorragia/diagnóstico , Hospitalização , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Fatores de Risco , Adulto Jovem
20.
Nutr Clin Pract ; 32(2): 212-218, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-27329861

RESUMO

BACKGROUND: An effective method for long-term enteral feeding or stomach decompression is the use of a percutaneous gastrostomy (PEG) or sometimes jejunostomy (PEJ). Under certain circumstances (eg, inadequate transillumination), endoscopic placement of PEG/PEJ tubes is impossible. In these cases, computed tomography (CT)-guided PEG/PEJ may represent an alternative technique. In this study, we evaluate indications, results, and complications of CT-guided PEG/PEJ. MATERIALS AND METHODS: A total of 102 consecutive referred patients were enrolled in the study. Patients came to the endoscopy unit of our department to undergo a CT-guided PEG/PEJ for long-term intragastric/intrajejunal feeding (n = 57) or decompression (n = 45). The majority (n = 98) received a pull-through PEG/PEJ with simultaneous gastroscopy/jejunoscopy. Dose length product and the effective dose for every patient were calculated. RESULTS: PEG/PEJ tube placement was successful in 87.3% (89 of 102). Feeding PEG/PEJ tube placement was successfully completed in 91.2% (52 of 57); decompressive PEG/PEJ tube placement was likewise successfully completed in 82.2% (37 of 45). No procedure-related mortality was observed. Minor complications (eg, tube dysfunction, local bleeding, minimal leakage, local skin infection) were observed in 13 patients. The complication rate was similar between the feeding and decompression groups ( P = .9). CONCLUSIONS: CT-guided PEG/PEJ is a feasible and safe method with a low procedure-related morbidity rate for patients where endoscopic placement via transillumination is not successful. Thus, the procedure is an attractive alternative to surgical tube placement. Long-term complications, mainly tube disturbances, can be treated easily.


Assuntos
Descompressão , Nutrição Enteral , Gastrostomia/métodos , Jejunostomia/métodos , Tomografia Computadorizada por Raios X , Adulto , Idoso , Idoso de 80 Anos ou mais , Endoscopia Gastrointestinal , Estudos de Viabilidade , Feminino , Seguimentos , Humanos , Intubação Gastrointestinal , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Estômago/diagnóstico por imagem , Estômago/patologia
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