Morphological and functional alterations of the intestine of rats with iron-deficiency anemia

The present study was designed to assess the intestinal absorption of D-xylose and jejunal morphometry in rats with iron-deficiency anemia. Male Wistar rats were randomly divided into a control group (diet containing 50 mg Fe/kg, N = 12) and an anemic group (diet containing <5 mg Fe/kg, N = 12). The animals were housed in individual metabolic cages and deionized water and diet were provided ad libitum for 6 weeks. Hemoglobin and hematocrit were determined at 0, 2, 4, and 6 weeks. At the end of the study the rats were submitted to a D-xylose absorption test (50 mg/100 g body weight) and sacrificed and a jejunal specimen was obtained for morphometric study. At the end of the study the hemoglobin and hematocrit of the anemic rats (8.7 ± 0.9 g/dl and 34.1 ± 2.9 percent, respectively) were significantly (P < 0.05) lower than those of the controls (13.9 ± 1.4 g/dl and 47.1 ± 1.5 percent, respectively). There was no statistical difference in D-xylose absorption between the anemic (46.5 ± 7.4 percent) and control (43.4 ± 9.0 percent) groups. The anemic animals presented statistically greater villus height (445.3 ± 36.8 µm), mucosal thickness (614.3 ± 56.3 µm) and epithelial surface (5063.0 ± 658.6 µm) than control (371.8 ± 34.3, 526.7 ± 62.3 and 4401.2 ± 704.4 µm, respectively; P < 0.05). The increase in jejunum villus height, mucosal thickness and epithelial surface in rats with iron-deficiency anemia suggests a compensatory intestinal mechanism to increase intestinal iron absorption.

Demographic and anthropometrical analysis and genotype distribution of chronic hepatitis C patients treated in public and private reference centers in Brazil

Hepatitis C virus (HCV) infection is a serious public health problem, since 80 percent to 85 percent of HCV carriers develop a persistent infection that can progress into liver cirrhosis and hepatocarcinoma. Considering that the response of hepatitis C patients to combination therapy with interferon and ribavirin depends on HCV characteristics as well as on host features, we made a retrospective analysis of demographic and anthropometrical data and HCV genotype distribution of chronic hepatitis C patients treated in public and private reference centers in Brazil. The medical records of 4,996 patients were reviewed, 81 percent from public and 19 percent from private institutions. Patients' median age was 46 years, and there was a higher prevalence of male (62 percent) and white patients (80 percent). The analysis of HCV-infecting strains showed a predominance of genotype 1 (64 percent) over genotypes 2 and 3. The patients' mean weight was 70.6 kg, and 65 percent of the patients weighed less than 77kg. Overweight and obesity were observed in 37.8 percent and 13.6 percent of the patients, respectively. Since a body weight of 75 kg or less has been considered an independent factor that significantly increases the odds of achieving a sustained virological response, the Brazilian population seems to have a more favorable body weight profile to achieve a sustained response than the American and European populations. The finding that 65 percent of chronic hepatitis C patients have a body weight of 77 kg or less may have a positive pharmacoeconomic impact on the treatment of genotype 1 HCV patients with weight-based doses of peginterferon.

Prevalência de fibromialgia em pacientes infectados com o vírus da hepatite C / Prevalence of fibromyalgia in patients infected by the hepatitis C virus

OBJETIVO: Conhecer a prevalência e as características epidemiológicas de pacientes com fibromialgia e infecção pelo vírus da hepatite C. MÉTODOS: oitenta e quatro pacientes com o vírus da hepatite C foram consecutivamente avaliados em um período de 6 meses. A prevalência da fibromialgia e as características da população foram avaliadas por anamnese, exame físico e revisões de prontuários. RESULTADOS: a síndrome de fibromialgia foi verificada em 12 pacientes (14,2 por cento), com 23 por cento das mulheres entrevistadas apresentando esse diagnóstico. A porcentagem entre homens também foi alta (8 por cento). Outro dado relevante foi a prevalência de alteração do sono encontrada no grupo de pacientes com o vírus da hepatite C, alcançando 50 por cento. Não houve relação entre a prevalência da fibromialgia e o tempo de doença hepática (média de 3,37 anos). Também não foi encontrada diferença no grau de comprometimento hepático (avaliado com ALT e biópsia hepática) entre os grupos com ou sem fibromialgia. CONCLUSÕES: a síndrome de fibromialgia teve grande prevalência neste estudo. A prevalência dessa doença em mulheres infectadas com o vírus da hepatite C foi de aproximadamente 25 por cento, índice elevado em relação à média mundial, mas compatível com a literatura. Embora não faça parte da investigação de rotina, especial atenção deve ser dada, durante a anamnese e exames físicos e laboratoriais, a pacientes com esse quadro. Futuros estudos trarão mais informações sobre essa associação e os mecanismos patogênicos da fibromialgia em pacientes infectados com o vírus da hepatite C.

Studies of the small bowel surface by scanning electron microscopy in infants with persistent diarrhea

We describe the ultrastructural abnormalities of the small bowel surface in 16 infants with persistent diarrhea. The age range of the patients was 2 to 10 months, mean 4.8 months. All patients had diarrhea lasting 14 or more days. Bacterial overgrowth of the colonic microflora in the jejunal secretion, at concentrations above 10(4) colonies/ml, was present in 11 (68.7 percent) patients. The stool culture was positive for an enteropathogenic agent in 8 (50.0 percent) patients: for EPEC O111 in 2, EPEC O119 in 1, EAEC in 1, and Shigella flexneri in 1; mixed infections due to EPEC O111 and EAEC in 1 patient, EPEC O119 and EAEC in 1 and EPEC O55, EPEC O111, EAEC and Shigella sonnei in 1. Morphological abnormalities in the small bowel mucosa were observed in all 16 patients, varying in intensity from moderate 9 (56.3 percent) to severe 7 (43.7 percent). The scanning electron microscopic study of small bowel biopsies from these subjects showed several surface abnormalities. At low magnification (100X) most of the villi showed mild to moderate stunting, but on several occasions there was subtotal villus atrophy. At higher magnification (7,500X) photomicrographs showed derangement of the enterocytes; on several occasions the cell borders were not clearly defined and very often microvilli were decreased in number and height; in some areas there was a total disappearance of the microvilli. In half of the patients a mucus-fibrinoid pseudomembrane was seen partially coating the enterocytes, a finding that provides additional information on the pathophysiology of persistent diarrhea

Reduçäo de "Nitroblue Tetrazolium" por neutrófilos polimorfonucleares como critério para otimizaçäo de dose de ß1-3 glucano para bezerros / ß1-3 glucan: Nitroblue Tetrazolium reduction by polymorphonuclear neutrophils as dose optimization criterion in calves

O teste de reduçäo de "nitroblue tetrazolium" foi avaliado como critério para a seleçäo de doses em bezerros tratados com ß1-3 glucano. Observou-se que o tratamento com ß1-3 glucano estimulou a reduçäo de "nitroblue tetrazolium" e que esta estimulaçäo apresenta um comportamento estimulatório bifásico para as três doses de 1, 3 e 5mg/kg de peso corporal, este efeito está freqüentemente associado à administraçäo parenteral de carboidratos imunomoduladores. A resposta foi observada por período de 3 e 14 dias para as doses entre 1 e 5mg/kg e 3 e 21 dias para 3mg/kg de peso corporal. A mais alta resposta foi observada 14 dias após o tratamento. A dose de 5mg/kg foi selecionada como a mais adequada por apresentar o mais alto índice estimulatório observado