Hypertension and nephrology

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

KÖVESDY Csaba, NAGY Judit

NOVEMBER 20, 2010

Hypertension and nephrology - 2010;14(06)

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Hypertension and nephrology

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

NAGY Judit, KOVÁCS Tibor, KÖVESDY Csaba

[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.]

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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Clinical Neuroscience

Late simultaneous carcinomatous meningitis, temporal bone infiltrating macro-metastasis and disseminated multi-organ micro-metastases presenting with mono-symptomatic vertigo – a clinico-pathological case reporT

JARABIN András János, KLIVÉNYI Péter, TISZLAVICZ László, MOLNÁR Anna Fiona, GION Katalin, FÖLDESI Imre, KISS Geza Jozsef, ROVÓ László, BELLA Zsolt

Although vertigo is one of the most common complaints, intracranial malignant tumors rarely cause sudden asymmetry between the tone of the vestibular peripheries masquerading as a peripheral-like disorder. Here we report a case of simultaneous temporal bone infiltrating macro-metastasis and disseminated multi-organ micro-metastases presenting as acute unilateral vestibular syndrome, due to the reawakening of a primary gastric signet ring cell carcinoma. Purpose – Our objective was to identify those pathophysiological steps that may explain the complex process of tumor reawakening, dissemination. The possible causes of vestibular asymmetry were also traced. A 56-year-old male patient’s interdisciplinary medical data had been retrospectively analyzed. Original clinical and pathological results have been collected and thoroughly reevaluated, then new histological staining and immunohistochemistry methods have been added to the diagnostic pool. During the autopsy the cerebrum and cerebellum was edematous. The apex of the left petrous bone was infiltrated and destructed by a tumor mass of 2x2 cm in size. Histological reexamination of the original gastric resection specimen slides revealed focal submucosal tumorous infiltration with a vascular invasion. By immunohistochemistry mainly single infiltrating tumor cells were observed with Cytokeratin 7 and Vimentin positivity and partial loss of E-cadherin staining. The subsequent histological examination of necropsy tissue specimens confirmed the disseminated, multi-organ microscopic tumorous invasion. Discussion – It has been recently reported that the expression of Vimentin and the loss of E-cadherin is significantly associated with advanced stage, lymph node metastasis, vascular and neural invasion and undifferentiated type with p<0.05 significance. As our patient was middle aged and had no immune-deficiency, the promoting factor of the reawakening of the primary GC malignant disease after a 9-year-long period of dormancy remained undiscovered. The organ-specific tropism explained by the “seed and soil” theory was unexpected, due to rare occurrence of gastric cancer to metastasize in the meninges given that only a minority of these cells would be capable of crossing the blood brain barrier. Patients with past malignancies and new onset of neurological symptoms should alert the physician to central nervous system involvement, and the appropriate, targeted diagnostic and therapeutic work-up should be established immediately. Targeted staining with specific antibodies is recommended. Recent studies on cell lines indicate that metformin strongly inhibits epithelial-mesenchymal transition of gastric cancer cells. Therefore, further studies need to be performed on cases positive for epithelial-mesenchymal transition.

Clinical Neuroscience

Alexithymia is associated with cognitive impairment in patients with Parkinson’s disease

SENGUL Yildizhan, KOCAK Müge, CORAKCI Zeynep, SENGUL Serdar Hakan, USTUN Ismet

Cognitive dysfunction (CD) is a common non-motor symptom of Parkinson’s disease (PD). Alexithy­mia is a still poorly understood neuropsychiatric feature of PD. Cognitive impairment (especially visuospatial dysfunction and executive dysfunction) and alexithymia share com­mon pathology of neuroanatomical structures. We hypo­thesized that there must be a correlation between CD and alexithymia levels considering this relationship of neuroanatomy. Objective – The aim of this study was to evaluate the association between alexithymia and neurocognitive function in patients with PD. Thirty-five patients with PD were included in this study. The Toronto Alexithymia Scale–20 (TAS-20), Geriatric Depression Inventory (GDI) and a detailed neuropsychological evaluation were performed. Higher TAS-20 scores were negatively correlated with Wechsler Adult Intelligence Scale (WAIS) similarities test score (r =-0.71, p value 0.02), clock drawing test (CDT) scores (r=-0.72, p=0.02) and verbal fluency (VF) (r=-0.77, p<0.01). Difficulty identifying feelings subscale score was negatively correlated with CDT scores (r=-0.74, p=0.02), VF scores (r=-0.66, p=0.04), visual memory immediate recall (r=-0.74, p=0.01). VF scores were also correlated with difficulty describing feelings (DDF) scores (r=-0.66, p=0.04). There was a reverse relationship bet­ween WAIS similarities and DDF scores (r=-0.70, p=0.02), and externally oriented-thinking (r=-0.77,p<0.01). Executive function Z score was correlated with the mean TAS-20 score (r=-62, p=0.03) and DDF subscale score (r=-0.70, p=0.01) Alexithymia was found to be associated with poorer performance on visuospatial and executive function test results. We also found that alexithymia was significantly correlated with depressive symptoms. Presence of alexithymia should therefore warn the clinicians for co-existing CD.

Hypertension and nephrology

[About the care of patients with hyperuricaemia and gout]

[This consensus document is intended to provide guidance for the effective and efficient treatment of asymptomatic individuals with high uric acid levels and gout patients.]

Clinical Neuroscience

[What happens to vertiginous population after emission from the Emergency Department?]

MAIHOUB Stefani, MOLNÁR András, CSIKÓS András, KANIZSAI Péter, TAMÁS László, SZIRMAI Ágnes

[Background – Dizziness is one of the most frequent complaints when a patient is searching for medical care and resolution. This can be a problematic presentation in the emergency department, both from a diagnostic and a management standpoint. Purpose – The aim of our study is to clarify what happens to patients after leaving the emergency department. Methods – 879 patients were examined at the Semmel­weis University Emergency Department with vertigo and dizziness. We sent a questionnaire to these patients and we had 308 completed papers back (110 male, 198 female patients, mean age 61.8 ± 12.31 SD), which we further analyzed. Results – Based on the emergency department diagnosis we had the following results: central vestibular lesion (n = 71), dizziness or giddiness (n = 64) and BPPV (n = 51) were among the most frequent diagnosis. Clarification of the final post-examination diagnosis took several days (28.8%), and weeks (24.2%). It was also noticed that 24.02% of this population never received a proper diagnosis. Among the population only 80 patients (25.8%) got proper diagnosis of their complaints, which was supported by qualitative statistical analysis (Cohen Kappa test) result (κ = 0.560). Discussion – The correlation between our emergency department diagnosis and final diagnosis given to patients is low, a phenomenon that is also observable in other countries. Therefore, patient follow-up is an important issue, including the importance of neurotology and possibly neurological examination. Conclusion – Emergency diagnosis of vertigo is a great challenge, but despite of difficulties the targeted and quick case history and exact examination can evaluate the central or peripheral cause of the balance disorder. Therefore, to prevent declination of the quality of life the importance of further investigation is high.]

Clinical Neuroscience

[The connection between the socioeconomic status and stroke in Budapest]

VASTAGH Ildikó, SZŐCS Ildikó, OBERFRANK Ferenc, AJTAY András, BERECZKI Dániel

[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. ]