No abstract

Metabonomics based on nuclear magnetic resonance (NMR) can reveal the profile of endogenous metabolites of low molecular weight in biofluids related to disease. The profile is identified a 'metabolic fingerprint' like from the pathological process, why this metabonomics has been used as a diagnostic method. The aim of the present study was to apply metabonomics to identify patients infected with the hepatitis C virus (HCV) through an analysis of ¹H NMR spectra of urine samples associated with multivariate statistical methods. A pilot study was carried out for the diagnostic test evaluation, involving two groups: (i) 34 patients positive for anti-HCV and HCV-RNA and negative for anti-HBc (disease group); and (ii) 32 individuals positive for anti-HBc and negative for HBsAg and anti-HCV. The urine samples were analyzed through ¹H NMR, applying principal component analysis and discriminant analysis for classification. The metabonomics model was capable of identifying 32 of the 34 patients in the disease group as positive and 31 of the 32 individuals in the control group as negative, demonstrating 94% sensitivity and specificity of 97% as well as positive and negative predictive values of 97% and 94%, respectively, and 95% accuracy (P < 0.001). In conclusion, the metabonomics model based on ¹H NMR spectra of urine samples in this preliminary study discriminated patients with HCV infection with high sensitivity and specificity, thereby demonstrating this model to be a potential tool for use in medical practice in the near future.

We examined the periodicity and intravascular distribution of Wuchereria bancrofti microfilariae (rnf) and determined the effect of these parasite properties on the accuracy of blood filming and filtration methods for diagnosis of bancroftian filariasis in the endemic area of Recife, Brazil. Microfilariae in both venous and capillary blood exhibited a nocturnal periodicity pattern with a relatively high amplitude. Overall, capillary blood contained -1.25 times the number of rnf present at the same time in the same volume of venous blood. However, the ratio of rnf present in capillary and venous blood varied over a z4-hour period, so that the fewest mf were present in the capillary bed of the skin at the time when biting activity of the local Culex vector is the lowest. Twenty or 6 0 p1 blood films did not reliably detect carriers with fewer than IOO or 60 rnf/ml venous blood, respectively, and were thus inadequate for the identification of low density rnf carriers. In contrast, all carriers with > I mW2o or 60 pl blood smear at night could be identified during daytime hours by filtration of I ml venous blood keywords Wuchereria bancrofti, periodicity, distribution, capillary blood, venous blood, thick smear. filtration

No abstract

The seroprevalence rate of Hp antibodies amongst medical students and residents increases from the basic up to residence level, suggesting that contact with patients during clinical practice may constitute a risk factor for acquiring Hp infection.

The evidence of a higher incidence of hepatitis G virus (HGV) infection among patients with hepatocellular carcinoma (HCC) and the relatively high prevalence of patients with primary liver carcinoma without apparent risk factors in our country motivated the present study, the objective of which was to determine the frequency of HGV-ribonucleic acid (RNA) in a series of patients with HCC. The diagnosis of HCC was established based on alpha-fetoprotein levels (>400 ng/ml), a compatible image and/or biopsy of the hepatic nodules. Markers of hepatitis B virus (HBV) (HBsAg and anti-HBc), hepatitis C virus (HCV) (anti-HCV) and HGV (HGV-RNA) were investigated using MEIA and RT-PCR (reverse transcriptase polymerase chain reaction). There were 32 patients evaluated, including 20 males (63%), with a mean age of 58 years. Twenty-eight (88%) patients were cirrhotic (Child-Pugh: A = 8 patients, B = 14, and C = 6) and 50% reported alcohol consumption. Serological hepatitis markers were detected in 26 (81%) patients, including HBV in 19 (59%), HCV in 12 (38%) and HGV in 9 (28%). Only one (3%) patient was positive for HGV alone. The prevalence of HGV in blood donors from the same region is 10%. The findings suggest that, despite the frequent detection of HGV markers in patients with HCC, isolated infection with this agent does not seem to be a relevant factor in the etiology of this carcinoma.

No abstract

The patients with chronic renal failure in hemodialysis present low levels of serum alanine aminotransferases. In order to establish a better cutoff value for ALT in hepatitis C screening of hemodialysis patients, the ALT levels were measured monthly in 235 patients, being excluded those that presented average above the upper limit of normality. The cutoff value was identified by construction of a ROC curve (receiver operating characteristic). Among 202 patients, 15 (7.4%) presented antibodies to hepatitis C virus (anti-HCV) and 187 (92.6%) were anti-HCV negative, with an ALT average of 0.7 and of 0.5 from ULN (p <0.0001), respectively. The better cutoff value for ALT was at 0.6 from ULN, with sensitivity of 67% and specificity of 75% in anti-HCV screening. These results suggest that ULN of ALT could be reduced for 60% from conventional limit, when we are evaluating patients with CRF in hemodialysis.