Imaging the Effects of Whole-Body Vibration on the Progression of Hepatic Steatosis by Quantitative Ultrasound Based on Backscatter Envelope Statistics.

Hepatic steatosis causes nonalcoholic fatty liver disease. Whole-body vibration (WBV) has been recommended to allow patients who have difficulty engaging in exercise to improve the grade of hepatic steatosis. This study proposed using ultrasound parametric imaging of the homodyned K (HK) distribution to evaluate the effectiveness of WBV treatments in alleviating hepatic steatosis. Sixty mice were assigned to control (n = 6), sedentary (n = 18), WBV (n = 18), and exercise (swimming) (n = 18) groups. Mice were fed a high-fat diet to induce hepatic steatosis and underwent the intervention for 4, 8, and 16 weeks. Ultrasound scanning was performed in vivo on each mouse after the interventions for ultrasound HK imaging using the parameter µ (the scatterer clustering parameter). Histopathological examinations and the intraperitoneal glucose tolerance test were carried out for comparisons with ultrasound findings. At the 16th week, WBV and exercise groups demonstrated lower body weights, glucose concentrations, histopathological scores (steatosis and steatohepatitis), and µ parameters than the control group (p < 0.05). The steatosis grade was significantly lower in the WBV group (mild) than in the exercise group (moderate) (p < 0.05), corresponding to a reduction in the µ parameter. A further analysis revealed that the correlation between the steatosis grade and the µ parameter was 0.84 (p < 0.05). From this animal study we conclude that WBV may be more effective than exercise in reducing the progression of hepatic steatosis, and ultrasound HK parametric imaging is an appropriate method for evaluating WBV's effect on hepatic steatosis.

Trademark potential increase and entrepreneurship rural development: A case study of Southern Transylvania, Romania.

Cultural heritage capitalization in rural areas redefines the local development model. Thus, heritage tourism has become the engine of economic activities diversification. This study aims to identify a decision-making-model substantiating algorithm in order to support the local heritage capitalization (lesser known on the international cultural consumption market), based on three types of qualitative researches, and the improved Analytical Hierarchy Process (AHP) method. In case of lesser known heritage, trademark potential and international cultural tourism route for heritage capitalization are smart choices for the innovative local hub development. The developed AHP version allows for a broader investigation of the characteristics that can lead to a trademark associated development based on integrated and innovative tourism products. To substantiate our approach and validate the model, we conducted a pilot study on a geographic area (Southern Transylvania, Romania), slightly exploited from the perspective of heritage potential, and characterized by a combination of heritage assets. The study's results can be used by local authorities as a foundation for sound and strategic development of the area with economic potential from tangible and intangible heritage (re)interpretation.

Ultrasound Detection of Liver Fibrosis in Individuals with Hepatic Steatosis Using the Homodyned K Distribution.

Acoustic structure quantification (ASQ) based on the analysis of ultrasound backscattered statistics has been reported to detect liver fibrosis without significant hepatic steatosis. This study proposed using ultrasound parametric imaging based on the parameter α of the homodyned K (HK) distribution for staging liver fibrosis in patients with significant hepatic steatosis. Raw ultrasound image data were acquired from patients (n = 237) to construct B-mode and HK α parametric images, which were compared with the focal disturbance (FD) ratio obtained from ASQ on the basis of histologic evidence (METAVIR fibrosis score and hepatic steatosis severity). The data were divided into group I (n = 173; normal to mild hepatic steatosis) and group II (n = 64; with moderate to severe hepatic steatosis) for statistical analysis through one-way analysis of variance and receiver operating characteristic (ROC) curve analysis. The results showed that the HK α parameter monotonically decreased as the liver fibrosis stage increased (p < .05); concurrently, the FD ratio increased (p < .05). For group I, the areas under the ROC (AUROCs) obtained using the FD ratio and the α parameter (AUROCFD and AUROCα) were, respectively, 0.56 and 0.55, 0.68 and 0.68, 0.64 and 0.64 and 0.62 and 0.62 for diagnosing liver fibrosis ≥F1, ≥F2, ≥F3 and ≥F4. The values of AUROCFD and AUROCα for group II were, respectively, 0.88 and 0.91, 0.81 and 0.81, 0.77 and 0.76 and 0.78 and 0.73 for diagnosing liver fibrosis ≥F1, ≥F2, ≥F3 and ≥F4. As opposed to previous studies, ASQ was found to fail in characterizing liver fibrosis in group I; however, it was workable for identifying liver fibrosis in patients with significant hepatic steatosis (group II). Compared with ASQ, HK imaging provided improved diagnostic performance in the early detection of liver fibrosis coexisting with moderate to severe hepatic steatosis. Ultrasound HK imaging is recommended as a strategy to evaluate early fibrosis risk in patients with significant hepatic steatosis.

Value of homodyned K distribution in ultrasound parametric imaging of hepatic steatosis: An animal study.

Ultrasound is the first-line tool for screening hepatic steatosis. Statistical distributions can be used to model the backscattered signals for liver characterization. The Nakagami distribution is the most frequently adopted model; however, the homodyned K (HK) distribution has received attention due to its link to physical meaning and improved parameter estimation through X- and U-statistics (termed "XU"). To assess hepatic steatosis, we proposed HK parametric imaging based on the α parameter (a measure of the number of scatterers per resolution cell) calculated using the XU estimator. Using a commercial system equipped with a 7-MHz linear array transducer, phantom experiments were performed to suggest an appropriate window size for α imaging using the sliding window technique, which was further applied to measuring the livers of rats (n = 66) with hepatic steatosis induced by feeding the rats a methionine- and choline-deficient diet. The relationships between the α parameter, the stage of hepatic steatosis, and histological features were verified by the correlation coefficient r, one-way analysis of variance, and regression analysis. The phantom results showed that the window side length corresponding to five times the pulse length supported a reliable α imaging. The α parameter showed a promising performance for grading hepatic steatosis (p < 0.05; r2 = 0.68). Compared with conventional Nakagami imaging, α parametric imaging provided significant information associated with fat droplet size (p < 0.05; r2 = 0.53), enabling further analysis and evaluation of severe hepatic steatosis.

Quantitative assessment of media concentration using the Homodyned K distribution.

The Homodyned K distribution has been used successfully as a tool in the ultrasound characterization of sparse media, where the scatterer clustering parameter α accurately discriminates between media with different numbers of scatterers per resolution cell. However, as the number of scatterers increases and the corresponding amplitude statistics become Rician, the reliability of the α estimates decreases rapidly. In the present study, we assess the usefulness of α for the characterization of both sparse and concentrated media, using simulated independent and identically distributed (i.i.d.) samples from Homodyned K distributions, ultrasound images of media with up to 68 scatterers per resolution cell and ultrasound signals acquired from particle phantoms with up to 101 scatterers per resolution cell. All parameter estimates are obtained using the XU estimator (Destrempes et al., 2013). Results suggest that the parameter α can be used to distinguish between media with up to 40 scatterers per resolution cell at 22 MHz, provided that parameter estimation can be performed on very large sample sizes (i.e., >10,000 i.i.d. samples).

Serological and histological correlations in celiac disease.

UNLABELLED: The aim of this study was to compare the sensitivity of the serological markers in patients with non-treated celiac disease by determination of antiendomysium and anti-tissue-transglutaminase autoantibodies separately and together. At the same time we examined the correlation between the serum levels of the two antibodies and the severity of the histological lesions. MATERIAL AND METHODS: The research included 26 persons (19 females, 7 males, age range 18-56 years) in whom the small bowel biopsy confirmed the villous atrophy. The sera of these patients were investigated by the determination of antiendomysium antibodies (AEA) and antitissue-transglutaminase antibodies (ATTG). For the morphological disorders we used the Marsh modified criteria. ATTG were determined by a sandwich-ELISA technique and AEA were dosed by indirect immunofluorescence technique. RESULTS: 6 patients presented with partial villous atrophy (PVA), 7 with subtotal villous atrophy (SVA) and 13 with total villous atrophy (TVA). 23 persons were seropositive, having at least one of the two antibodies tested. The sensitivity of the serological investigation increased at 88% using both AEA and ATTG determinations. In patients with TVA, the sensitivity of ATTG was 100% and of AEA was 92%. In patients with SVA and PVA, the sensitivity of these antibodies was lower. Among the patients with SVA, 43% were negative for AEA and 50% for ATTG. The determination of AEA and ATTG together reduced the seronegativity at 15% in patients with SVA and at 34% in patients with PVA. CONCLUSIONS: Antitissue-transglutaminase antibodies testing in patients with non-treated celiac disease is more sensitive than antiendomysium antibodies. The efficiency of the serological diagnosis improves when both AEA and ATTG are determined. Serum antibodies levels correlated very well with the severe histological alterations (TVA), but the correlation is not so good with SVA and PVA. So, we can tell that high levels of AEA and/or ATTG are suggestive for severe histological disorders in celiac disease.

Antiendomysial and antitissue transglutaminase antibodies in gluten-induced enteropathy.

Although the gold standard for diagnosis of coeliac disease remains the small bowel biopsy, the broad spectrum and the non-specific nature of many of the clinical manifestations makes biopsy as the initial investigation impossible. So, much effort has been put into the identification of serological screening tests with adequate sensitivity and specificity. The aim of this study was to identify antiendomysial and antitissue-transglutaminase antibodies as serum markers of coeliac disease in a group of patients admitted in the 3rd Medical Clinic, 4th Medical Clinic and 1st Pediatric Clinic as well as in the general population. The study was made on serum samples collected from 64 persons, adults and children with or without documented coeliac disease. Antitissue transglutaminase (anti-tTG) antibodies were determined by the sandwich ELISA technique, using a commercial kit. Antiendomysium (EMA) antibodies were dosed by indirect immunofluorescence. Twenty-four subjects were positive for IgA anti-tTG and 23 for EMA. We found that IgA anti-tTG were 100% positive in patients with clinical suspicion of coeliac disease, the diagnosis being confirmed by biopsy. All, but two patients on a gluten-free diet had small or zero EMA levels. We also found that serum EMA levels correlated perfectly with the degree of histological alterations. A very good correlation was found between the serum concentrations of the two antibodies studied

[The ecological accident on the Siret River. A possible cyanide intoxication of children]. / Accidentul ecologic de pe râul Siret. Un episod de intoxicatie cu cianuri la copii.

THE PURPOSE: Of our study is to assess the gravity of cyanide intoxication of children, in the ecological accident in January 2001. MATERIAL AND METHODS: We included in our study 127 children aged between 2 months and 17 years. They were hospitalized in January and February 2001, in the "Sf. Maria" Children's Hospital. Case analysis was based on data of the emergency unit and units where the children were sent after primary care. We evaluated the patients from clinical and paraclinical point of view and we took samples of biological products in order to confirm the diagnosis. RESULTS: Age distribution was 0-1 year (4%), 1-3 years (7.8%), 3-6 years (9.4%), 6-12 years (33.8%), and 12-18 years (42.5%). The lapse of time between the ingestion of contaminated fish and symptomatology was variable. Measures were taken: removal from toxic contact, hospitalization, antidote administration, and treatment of complications. DISCUSSIONS: Although literature data shows that this intoxication appears after the age of three, we found that mother ingestion of contaminated fish, determined intoxication in nursings. Symptoms appeared at 3-12 hours after fish ingestion from the contaminated river and it was suggestive for the diagnosis. First aid measurements were necessary in specialized emergency unit and antidote administration sometimes only in clinical suspicion of intoxication. Correlation between clinical findings and toxic concentrations in urine samples confirm the diagnosis. CONCLUSIONS: Our study tries to highlight those ecological accidents with cyanides present important consequences on people and animal's health. The therapeutic intervention must be fast in order to stop blood distribution of the toxic.