In the bioanalytical field, sample preparation is often considered the time-limiting step. Indeed, extraction techniques (e.g., liquid–liquid extraction (LLE) and solid-phase extraction (SPE)) are ...commonly used off-line for biological matrices.
To perform high-throughput analysis, there have been efforts to develop a faster sample-purification process. Special extraction sorbents, such as restricted-access materials (RAMs), allow direct, repetitive injection of complex biological matrices onto these supports. Coupling RAMs to column-switching high-performance liquid chromatography (HPLC) systems is a very attractive approach to biological sample preparation. This technique leads to automation, simplification and speeding up of the sample-preparation process.
In this article, we review coupling of RAMs to column-switching systems and give particular attention to commercially available supports. These RAMs are used in single-column or column-switching configurations for direct analysis of compounds in various biological fluids.
Background: Geriatric syndromes represent a critical domain in the population more than 60 years old. Basic syndromes include frailty, sarcopenia, loss of body mass, and a mild cognitive disorder. ...These are significant problems which can affect the quality of life. In our study, the Rapid Geriatric Assessment (RGA) tool was used to assess the geriatric syndromes, and the WHOQOL-BREF was used to assess the quality of life to survey 498 respondents from a population aged 60 and older. In all the assessments, the distribution of variables was tested, a nonnormal distribution of variables was identified, and subsequently, nonparametric tests were performed to identify the differences between groups. The study showed that the domain of physical health and the psychological domain were most affected. The results have shown that individual geriatric syndromes affect certain domains of the quality of life of the population above 60 with various intensity.
Simvastatin and atorvastatin belong to the group of hypolipidemic drugs, more exactly to the second generation of inhibitors of microsomal 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase. ...They induce a significant reduction in total cholesterol, low-density lipoprotein cholesterol and plasma triglycerides, therefore they are widely used in the treatment of hypercholesterolemia even of its severe form-familiar hypercholesterolemia. Simvastatin and atorvastatin as the most widely used statins in clinical treatment and their hydroxy-acid/lactone forms were determined by means of UPLC in connection with triple quadrupole mass spectrometer. Deuterium labeled reference standard compounds were used as internal standards for the quantitation. Separation was performed on Acquity BEH C18 (100mm×2.1mm, 1.7μm) using gradient elution by mobile phase containing acetonitrile and ammonium acetate pH 4.0, which is convenient in order to prevent interconversion of analytes. ESI in positive mode was used for the ionization of all compounds. Two SRM (selected reaction monitoring) transitions were carefully optimized for each analyte in order to get high sensitivity and selectivity. SPE on Discovery DSC-18 was used as a sample preparation step. Intra-day precision was generally within 10% RSD, while inter-day precision within 15% RSD. Method accuracy expressed as recovery ranged from 75 to 100%. The method was validated with the sensitivity reaching LOQ 0.08–5.46nmol/l and LOD 0.01–1.80nmol/l in biological samples. Atorvastatin, simvastatin, its metabolites and hydroxy-acid/lactone forms were monitored in human serum and in lipoprotein fractions (LDL, HDL and VLDL) at patients with end stage renal diseases.
Objective: The main goal of the study was to find out the general public's awareness of stroke, the relations between the awareness of stroke and socio-demographic factors, and awareness of stroke ...and experience of stroke. Methods: The combination of a non-standardized questionnaire on the stroke prevention and a standardized questionnaire on the identification of the general health literacy (HLSQ-16) was used. The sample was chosen using a quota choice. The sample structure corresponded with the composition of the Czech population with regard to regions, sex and age. These features were determined as representative. The sample consisted of 1,004 respondents. Results: The general awareness of stroke is high in the Czech Republic. Most of the respondents (97.2%) stated that they had ever heard of stroke. This basic awareness is influenced by the sex and marital status of the respondents. Almost one half (42.2%) of the general public would welcome more information on stroke. Women showed significantly higher interest in the information than men. Significantly higher interest could be seen in elderly respondents while younger respondents said significantly more frequently that they were not interested in the information. Married respondents showed a significantly higher degree of awareness. Rural respondents expressed higher interest in the information. The interest in the information dropped with higher education. The interest was significantly influenced by the respondents' sex, place of residence, marital status, and education. Almost 1/4 (24.3%) of respondents mentioned stroke incidence in their families. Our study proved that this incidence significantly varied in dependence on the respondents' sex, age, marital status and education. Further questions were focused on the sources of information on stroke. The most important sources include internet, which was named by nearly one half (48.6%) of respondents, and it was found that women could use the sources of information more frequently than men. Women used all sources of information on stroke (internet, television, families, GPs) more than men. Conclusion: The Czech respondents' interest in stroke is significantly influenced by their sex, age, place of residence, marital status, and the respondents' education. The findings play a role in the focus on preventive activities in this area. It is necessary to implement the general public education not only in general practitioners' offices but also in mass media in order to improve the awareness of stroke.
Thrombotic diathesis has been a well-known complication of oral contraceptive use for more than 50 years. This is true not only for venous thrombosis but also for an arterial one. The etiology is ...usually multifactorial and depends on several additional risk factors. We analyzed the prevalence of inherited and acquired thrombophilia in a cohort of 770 females who had a thrombotic event in association with oral contraceptive use (700 women with venous thromboembolism VTE, 70 with stroke). Moreover, we tried to identify additional risk factors. Inherited thrombophilia was found in 44.5% with higher frequency in the cohort with VTE (42%) than in females with stroke (24%). The most frequent finding was factor V Leiden. Cigarette smoking was significantly more frequent in the group with stroke (50% vs 25%). The prevalence of cigarette smoking in the group with VTE did not exceed the frequency in general population. Women on oral contraceptive pills have higher risk of venous as well as arterial thrombosis. The risk of venous thrombosis is increased in females with inherited thrombophilia, whereas those with some additional acquired risk factors (especially smoking) may be predisposed to arterial thrombosis. However, the absolute risk of thrombosis in healthy women is low, far less than the risk of unintended pregnancy. Moreover, the risk may be reduced by keeping some rules before the prescription of the pills, healthy life style, and a proper choice of contraception.
With increasing free thyroxine levels, a gradually rising risk of venous thromboembolism has been described in case-control studies. However, reports on the influence of thyroid hormones on ...haemostasis, while suggesting a hypercoagulable state in thyrotoxicosis, have often been inconclusive. This study evaluates multiple markers of haemostasis and fibrinolysis in a paired design, making it more sensitive to changes in thyroid hormone levels.
We analysed multiple variables in patients who shifted from severe hypothyroidism to mild hyperthyroidism during thyroid cancer treatment. Those with possible residual disease were excluded.
Ninety patients following total thyroidectomy were tested on two occasions: i) before radioiodine remnant ablation and ii) 6 weeks later, on levothyroxine (lT4) suppression treatment, and the results were compared using the Wilcoxon's test for paired data.
During lT4 treatment, significant increases (all P<0.001) in fibrinogen (from median 3.4 to 3.8 g/l), von Willebrand factor (from 85 to 127%), factor VIII (from 111 to 148%) and plasminogen activator inhibitor 1 (from 6.5 to 13.9 μg/l) were observed. In addition, the activation times of platelet adhesion and aggregation stimulated with collagen and epinephrine (EPI)/ADP, i.e. closure times in platelet function analyser (PFA-100), were significantly shortened (P<0.001): for EPI from median 148 to 117 s and for ADP from 95 to 80 s. Changes in other tests were less prominent or insignificant.
An increase in thyroid hormone levels shifts the haemostatic balance towards a hypercoagulable, hypofibrinolytic state. This may contribute to the increased cardiovascular morbidity and mortality observed even in mild thyrotoxicosis.
Budd-Chiari Syndrome (BCS) is characterized by obstruction of blood flow in hepatic veins. The aim of the study was to analyze diagnosis, etiology and management of BCS.
We analyzed 44 patients (32 ...females, 12 males, the mean age <35y of age) treated with TIPS. Ascites was found in 35 patients as the most frequent symptom. The median of total follow-up was 52 months. Non-covered (bare) or covered stent was inserted to all patients. Diagnosis of myeloproliferative neoplasm (MPN) was based on WHO criteria. Other inherited or acquired thrombophilia were assessed as well. Therapy of BCS was with regard to the etiology.
The etiology of BCS was identified in 38 cases. Ph- MPN was found as the most common risk factor (50%, N.=22), especially polycythemia vera. JAK2V617F mutation was detected in the most of 22 MPN cases (82.5%). The second most common etiologic factor was inherited thrombophilia (18%, N.=8). In the non-covered (bare) stent group, a primary patency rates 52.9% in 1 year and 20% in 5 years after TIPS (Portasystemic Shunt, Transjugular Intrahepatic) creation. In the covered stent group the 1-year and 5-year primary patency rates were was 80% and 33.3% respectively. The average 5-year re-intervention rate per patient was 1.65 procedures in the bare stent group and 0.67 in the covered stent group. Re-interventions were more frequent in MPN patients. All patients were anticoagulated with heparin at the beginning, switched to vitamin K antagonist. On top of TIPS, anticoagulant and a vigorous therapy of underlying disorder are necessary.
BCS is a serious and life-threatening disorder in MPD is a major cause of morbidity and mortality. Therapy requires a multidisciplinary approach. Insertion of TIPS dedicated covered stent is a very effective treatment in cases resistant to conservative approach with lower dysfunction rate and the number of re-interventions.
The rapid dissemination of drug use among adolescents in the Czech Republic and other Central and Eastern European countries during the 1990s had a significant impact on health care and social ...services for this population group. This paper describes the current situation related to drug use among adolescents in the Czech Republic and in other European countries and discusses several attitudinal and behavioral correlates of drug use among young people. The results presented here have been extracted from a database of the European School Survey on Alcohol and Other Drugs (ESPAD) from 1995, 1999, and 2003. At the time of data collection, the average age of respondents in the sample was 15.4 years. Marijuana was the most common illicit substance used by European adolescents. The results also showed a marked increase in the number of adolescents who use substances repeatedly between 1995 and 2003. A marked increase in the popularity of ecstasy occurred in the same period. Between 1999 and 2003, the use of opiates and amphetamines in the Czech Republic decreased slightly. Attitudinal variables indicate that Czech adolescents tend to be more tolerant towards selected forms of drug using behavior than are their peers in Europe. The policy by which society tries to confront drug related health and social issues includes an expansion of the network of specialized facilities for treatment and resocialization and long-term programs in the field of prevention. In the future, the significance of programs that focus on early detection and intervention will increase.
Quick growth of internet users worldwide as well as significant technological improvements has had an extensive impact on a traditional marketing communication. First part of the thesis focuses on ...the basic framework that would leverage the internet marketing implementation. In its second part, the Google advertising products (AdWords, Maps, YouTube) and tools(for planning, optimization and implementation) are analyzed and their role in the internet marketing process is explained and demonstrated.
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