Hypertension and nephrology

[Pleiotropic effects of vitamin-D mainly related to the cardiovascular system]

NAGY Judit, KOVÁCS Tibor, KÖVESDY Csaba

NOVEMBER 20, 2010

Hypertension and nephrology - 2010;14(06)

[Hypovitaminosis D has emerged as a risk factor for multiple adverse outcomes, including cardiovascular and cancer related morbidity and mortality. Observational studies along with laboratory investigations have lead to the discovery of the pleiotropic effects of vitamin D which affect a variety of physiologic processes such as blood pressure regulation, cell proliferation or the modulation of inflammation, and may account for the many negative clinical outcomes associated with hypovitaminosis D. Our article reviews studies that describe the incidence and prevalence of hypovitaminosis D, and the various adverse outcomes that low serum vitamin D has been linked with. This review will provide the reader with a better understanding of why vitamin D is currently regarded as a very promising area of research to try and lower adverse outcomes in a variety of patient groups and in the general population, with the main emphasis on patients with chronic kidney disease (CKD). Most of our discussion on the harmful effects of hypovitaminosis D will concentrate on conditions related to cardiovascular disease morbidity and mortality due to the significance of these in patients with CKD, with less mention of other deleterious effects related to low vitamin D levels such as malignancies.]

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Hypertension and nephrology

[Protective Effects of Vitamin D in Patients with Chronic Renal Disease]

KÖVESDY Csaba, NAGY Judit

Hypertension and nephrology

[Erythropoiesis-stimulating agents and oxidative stress in hemodialysis patients]

MONOSTORI Péter, S. VARGA Ilona, KISS József Zoltán, KISS István, HASZON Ibolya, PAPP Ferenc, SÜMEGI Viktória, BERECZKI Csaba, NÉMETH Ilona, TÚRI Sándor

[Oxidative stress plays an important role in the elevation of the cardiovascular risk of patients with chronic kidney insufficiency. The oxidative stress becomes more severe together with the deterioration of the renal function, and the hemodialysis sessions may also induce repetitive oxidative insults. Erythropoesis-stimulating agents (ESAs) may alter the level of oxidative stress via their effects on hematopoiesis, resulting in indirect effects on changes of iron metabolism and the levels of antioxidants. We review the current knowledge about the administration of ESAs as concerns effects on oxidative parameters in hemodialysis patients. We discuss the relationship between the characteristics of the ESA therapy (type, administration frequency and dosage of ESA, length of the therapy, administration withdrawal) and the oxidative stress in view of earlier and recent research.]

Hypertension and nephrology

[Is there a connection between neuropathy and hypertension?]

ISTENES Ildikó, KERESZTES Katalin, KEMPLER Péter

[Neuropathy is usually not an independent entity, its symptoms usually occur as part of other underlying diseases. Diabetes, chronic alcoholism, chronic liver diseases and chronic kidney diseases belong to the most important pathogenetic factors of neuropathy. It is less well known that neural damage may occur among patients with hypertension as well. Autonomic and sensory nerve dysfunction are considered as progressive forms of neuropathy. Both of them are associated with poor prognosis while quality of life is also significantly impaired among these patients. Key clinical characteristics of sensory and autonomic neuropathy are reviewed. There is a relationship between autonomic neuropathy and hypertension in patients with diabetes. Parasympathetic neuropathy and as a consequence relative sympathetic overactivity seems to have a pathogenetic role in this respect. The prevalence of previously unknown hypertension is doubled in diabetic patients with autonomic neuropathy - ambulatory blood pressure monitoring is suggested to be performed among these patients. The authors provided evidence that autonomic and sensory nerve dysfunctions are frequent complications of essential hypertension as well, which are closely related to traditional cardiovascular risk factors. Their observations may confirm the role of vascular factors in the pathogenesis of neuropathy.]

Hypertension and nephrology

[Focus on central arterial pressure. Beta blockers - one group of agents with different efficacy]

BARNA István

[Not only have beta blockers excellent antihypertensive effect but both in monotherapy and in combination they exert antiarrhythmic and antiischemic efficacy, as well. They are recommended on A level of evidence in the treatment of patients with primary hypertension. Certain beta blockers differ from each other considering their lipid solubility, membrane stabilizing effect and in many other characteristics which difference can be exploited in the treatment. Nebivolol increases the release of nitrogen oxide, it is metabolically neutral and has vasodilating and antioxidant effect. The consequence of the stiffness of the arterial wall is the rise of systolic blood pressure, the diminshed diastolic circulation in the coronary vessels, the increase of the central pulse pressure and the frequent occurrence of cardiovascular diseases. Various antihypertensive agents have different mode of action on central blood pressure and arterial stiffness. Comparing nebivolol/atenolol and nebivolol/bisoprolol, respectively, nebivolol decreased aortic pulse pressure with greater efficacy than other beta blockers. The extent of the reduction of blood pressure was the same in the nebivolol and atenolol group while the augmentation index decreased significantly among the patients receiving nebivolol. In addition to the well known beneficial effects of nebivolol recent studies proved another, yet still unknown and unique characteristic of this agent, i.e. favourable influence on arterial stiffness. It not only improves endothelial dysfunction which has emphasized role on development of atherosclerosis but - independently of its antihypertensive effect - it has favourable action on arterial stiffness, too. These features guarantee a decisive position in the treatment of arterial hypertension.]

Hypertension and nephrology

[The Effects of Focused Ultrasound on Glomerular Filtration]

FISCHER Krisztina

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[The well-known gap bet­ween stroke mortality of Eastern and Western Euro­pean countries may reflect the effect of socioeconomic diffe­rences. Such a gap may be present between neighborhoods of different wealth within one city. We set forth to compare age distribution, incidence, case fatality, mortality, and risk factor profile of stroke patients of the poorest (District 8) and wealthiest (District 12) districts of Budapest. We synthesize the results of our former comparative epidemiological investigations focusing on the association of socioeconomic background and features of stroke in two districts of the capital city of Hungary. The “Budapest District 8–12 project” pointed out the younger age of stroke patients of the poorer district, and established that the prevalence of smoking, alcohol-consumption, and untreated hypertension is also higher in District 8. The “Six Years in Two Districts” project involving 4779 patients with a 10-year follow-up revealed higher incidence, case fatality and mortality of stroke in the less wealthy district. The younger patients of the poorer region show higher risk-factor prevalence, die younger and their fatality grows faster during long-term follow-up. The higher prevalence of risk factors and the higher fatality of the younger age groups in the socioeconomically deprived district reflect the higher vulnerability of the population in District 8. The missing link between poverty and stroke outcome seems to be lifestyle risk-factors and lack of adherence to primary preventive efforts. Public health campaigns on stroke prevention should focus on the young generation of socioeconomi­cally deprived neighborhoods. ]

Lege Artis Medicinae

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[LATE EFFECTS OF TREATMENT FOR DECREASING CARDIOVASCULAR RISK “CARDIOMETABOLIC THERAPEUTIC MEMORY” - A HYPOTHESIS]

JERMENDY György

[In several randomised, controlled clinical studies conducted to decrease cardiovascular morbidity and mortality, there was long-term observational follow-up after the termination of the double-blind phase. There is evidence that the beneficial effect of the therapeutic intervention in the active study phase was maintained in the follow-up period. This phenomenon was observed both for life-style modification and for pharmacological intervention, including the use of ACE-inhibitors, statins, fibrates and intensive insulin treatment. This fact suggests the possibility that even after several years, the body “remembers” the beneficial effects of the cardiovascular risk reduction achieved years earlier. The phenomenon may be called “cardiometabolic therapeutic memory”.]

Ca&Bone

[Relationship of cardiovascular risk factors and bone status in a large adult population of the Balaton Region]

BUDAY BARBARA, IZSÓNÉ KATZ MELITTA, NAGY ELVIRA, PAPP ZSUZSA, KORÁNYI LÁSZLÓ

[BACKROUND - Numerous international studies have investigated the relationship between bone metabolism and type 2 diabetes mellitus. The results are controversial, there are those proving an increasing effect of diabetes on bone density but we know data that prove the opposite results. Our aim was to investigate the relationship between bone density, obesity and carbohydrate metabolism on a large Hungarian population. PATIENTS AND METHODS - The data from a large population screening (n=6287, mean age 56±13 years, men: n=1561, women: n=4726), carried out in the Balaton Region, Hungary, were analyzed (anthropometry, blood glucose and total cholesterol, blood pressure, calcaneus ultrasound T-score). RESULTS - Analyzing the relationship between type 2 diabetes and osteoporosis/osteopenia, we found, that the prevalence of osteopenia is significantly higher in diabetic women between 50-60 years of age than that of normal glucose tolerance, (50 vs. 36.34%, OR: 1.711, 95% CI: 1.076-2.722, p<0.022), however in different age groups and in males there were no significant differences, similar to the metabolic syndrome which did not influence the prevalence of osteoporosis/osteopenia. In normal weight (male and female) diabetic population over 60 years of age, the frequency of osteoporosis/ ostepenia was much higher, than in the normal weight normal glucose tolerance group, which difference was borderline-significant in the case of osteoporosis (63.63 vs. 26.2%, OR: 2.71, 95% CI: 0.969-7.6, p=0.054), and did not reach it with osteopenia (53.38 vs. 43.31%, p=0.359). In the same age group, within the “all glucose intolerant” and “all normal glucose tolerance” groups the prevalence of osteoporosis/osteopenia did not differ. We found significant correlation between BMI and T score only in women and it was strongest in age group of over 70 years (r=+0.23, p<0.001). CONCLUSION - Our data suggest that the increased bone density often measured in type 2 diabetic patients is actually the consequence of the accompanying obesity, and not of diabetes itself, which is rather a risk factor for bone loss.]

Hypertension and nephrology

[Population based study of hypertension in Hungary - 2012 Comprehensive Health Protection Screening Program of Hungary 201-2020]

BARNA István, DAIKI Tenno, DANKOVICS Gergely, KÉKES Ede, KISS István

[Background: The year 2011 saw the continuation of Hungary’s greatest and to date most comprehensive health screening programme started in 2010. The aim of the screening programme established according to the directives of the European Union with the cooperation of more than forty professional organisations is the preservation of the health of the population, the prevention of illnesses and the improvement of the general health status. The programme contributes to the prevention of coronary diseases by passing on knowledge concerning healthy nutrition and guidelines to help the establishment of a health-conscious lifestyle. Partecipants and methods: In the Comprehensive Health Tests Programme of Hungary, the examinations, among them coronary examinations covering the fields of cardiology and hypertension, take place in a specially furnished lorry. The results of the examinations of the people who have presented themselves for the tests (n=19,814) have been evaluated. In the Comprehensive Health Tests Programme of Hungary a total of 10,444 (52.7%) women and 9,370 (47.3%) men were tested at 332 locations. Although the tests were free for all adults, predominantly persons between the ages of 26 and 55 presented themselves. The average age of women was 42 years and that of the men was 40 years. Results: Upon data processing with the help of a query, 28% of the participants reported suffering from hypertension disease. Measurement of the blood pressure was carried out in each case with validated equipment and by qualified medical staff. Based on the data, it can be observed that while among men hypertension tends to occur in larger numbers at a younger age, the tendency is reversed at ages above 45 years, where hypertension is more frequent among women. Among women, the state of normotonia was most frequent up to the age of 45 and stage 1 hypertension became most frequent from the age of 46 onwards. It must be noted, however, that stage 3 hypertension was already present in 1.7% of women of 26 years of age, and the frequency of this category increased to 6% from the age of 46 onwards. The average systolic blood pressure measured among men exceeded the upper limit of the normal range for all age groups. The average systolic blood pressure measured among women was in the normal range up to the age of 55 years and only moved to the pathological range from the age of 56 onwards. The diastolic blood pressure levels were in the normal range for both sexes (with the exception of the age group 46-55 of the men, where it exceeded the upper limit of the normal range by a minimal extent). Among the men, stage 1 hypertension was the most frequent status for all age groups; blood pressures above 140/90 were measured for 39% of the subjects from the age of 18 onwards. The distribution of this did not vary significantly with the increase of age. It must be mentioned here too, that stage 3 hypertension became more frequent with age, and that it was observed in more than 11% of the patients above 56 years of age. The correlation between abdominal circumference, total cholesterol, blood sugar level and the measured blood pressure values was unambiguously ascertainable. In case of simultaneous presence of diabetes and hypertension (women, n=344 and men, n=303), blood pressures above 140/90Hgmm were 2-3 times more frequent for both sexes than without the presence of diabetes. Discussion: Thanks to the vast information obtained through the programme, a comprehensive picture has been drawn up about Hungary’s present health status not only on a regional or cross sectional level, but as it was described in the programme, too. ]