Hypertension and nephrology

[The Effects of Focused Ultrasound on Glomerular Filtration]

FISCHER Krisztina

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

[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.]

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Lege Artis Medicinae

[Risk of nonsteroidal antiinflammatory drugs. Focus on aceclofenac]

FARSANG Csaba

[Nonsteroidal antiinflammatory drugs (NSAIDs) are among the most frequently used pharmaceuticals. Nevertheless, a number of studies emphasized that NSAIDs were damaging not only the gastrointestinal (GI), but also the cardiovascular (CV) system, could increase the blood pressure, the frequency of coronary events (angina, myocardial infarction) and stroke incidence, as well as they might deterio­rate renal functions. The National Institute for Health and Care Excellence (NICE) did not find evidence that administering NSAIDs could increase the risk of developing COVID-19 or worsened the condition of COVID-19 patients. However, unwanted effects of specific drugs differ substantially in their occurrence and seriousness as well. It seemed to be for a long time that the NSAIDs provoked higher GI-risk was closely related to the COX1/COX2 selectivity, like the cardiovascular (CV) risk to the COX2/COX1 selectivity, however, the recent data did not prove it clearly. Based on the available literature while pondering the gastrointestinal and cardiovascular adverse events, among all NSAIDs the aceclofenac profile seemed to be the most favourable.]

Clinical Neuroscience

The etiology and age-related properties of patients with delirium in coronary intensive care unit and its effects on inhospital and follow up prognosis

ALTAY Servet, GÜRDOGAN Muhammet, KAYA Caglar, KARDAS Fatih, ZEYBEY Utku, CAKIR Burcu, EBIK Mustafa, DEMIR Melik

Delirium is a syndrome frequently encountered in intensive care and associated with a poor prognosis. Intensive care delirium is mostly based on general and palliative intensive care data in the literature. In this study, we aimed to investigate the incidence of delirium in coronary intensive care unit (CICU), related factors, its relationship with inhospital and follow up prognosis, incidence of age-related delirium and its effect on outcomes. This study was conducted with patients hospitalized in CICU of a tertiary university hospital between 01 August 2017 and 01 August 2018. Files of all patients were examined in details, and demographic, clinic and laboratory parameters were recorded. Patients confirmed with psychiatry consultation were included in the groups of patients who developed delirium. Patients were divided into groups with and without delirium developed, and baseline features, inhospital and follow up prognoses were investigated. In addition, patients were divided into four groups as <65 years old, 65-75 yo, 75-84 yo and> 85 yo, and the incidence of delirium, related factors and prognoses were compared among these groups. A total of 1108 patients (mean age: 64.4 ± 13.9 years; 66% men) who were followed in the intensive care unit with variable indications were included in the study. Of all patients 11.1% developed delirium in the CICU. Patients who developed delirium were older, comorbidities were more frequent, and these patients showed increased inflammation findings, and significant increase in inhospital mortality compared to those who did not develop delirium (p<0.05). At median 9-month follow up period, rehospitalization, reinfarction, cognitive dysfunction, initiation of psychiatric therapy and mortality were significantly higher in the delirium group (p<0.05). When patients who developed delirium were divided into four groups by age and analyzed, incidence of delirium and mortality rate in delirium group were significantly increased by age (p<0.05). Development of delirium in coronary intensive care unit is associated with increased inhospital and follow up morbidity and mortality. Delirium is more commonly seen in geriatric patients and those with comorbidity, and is associated with a poorer prognosis. High-risk patients should be more carefully monitored for the risk of delirium.

Clinical Neuroscience

Electrophysiological investigation for autonomic dysfunction in patients with myasthenia gravis: A prospective study

NALBANTOGLU Mecbure, AKALIN Ali Mehmet, GUNDUZ Aysegul, KIZILTAN Meral

Myasthenia gravis (MG) is an autoimmune disorder of neuromuscular transmission. Autonomic dysfunction is not a commonly known association with MG. We conducted this study to evaluate autonomic functions in MG & subgroups and to investigate the effects of acetylcholinesterase inhibitors. This study comprised 30 autoimmune MG patients and 30 healthy volunteers. Autonomic tests including sympathetic skin response (SSR) and R-R interval variation analysis (RRIV) was carried out. The tests were performed two times for patients who were under acetylcholinesterase inhibitors during the current assessment. The RRIV rise during hyperventilation was better (p=0.006) and Valsalva ratio (p=0.039) was lower in control group. The SSR amplitudes were lower thereafter drug intake (p=0.030). As much as time went by after drug administration prolonged SSR latencies were obtained (p=0.043).Valsalva ratio was lower in the AchR antibody negative group (p=0.033). The findings showed that both ocular/generalized MG patients have a subclinical parasympathetic abnormality prominent in the AchR antibody negative group and pyridostigmine has a peripheral sympathetic cholinergic noncumulative effect.

Clinical Neuroscience

Autonomic nervous system may be affected after carpal tunnel syndrome surgery: A possible mechanism for persistence of symptoms after surgery

ONDER Burcu, KELES Yavuz Betul

After carpal tunnel surgery, some patients report complaints such as edema, pain, and numbness. Purpose – The aim of this study was to evaluate autonomic nervous system function in patients with a history of carpal tunnel surgery using sympathetic skin response (SSR). Thirty three patients (55 ±10 years old) with a history of unilateral operation for carpal tunnel syndrome were included in the study. The SSR test was performed for both hands. Both upper extremities median and ulnar nerve conduction results were recorded. A reduced amplitude (p=0.006) and delayed latency (p<0.0001) were detected in the SSR test on the operated side compared to contralateral side. There was no correlation between SSR and carpal tunnel syndrome severity. Although complex regional pain syndrome does not develop in patients after carpal tunnel surgery, some of the complaints may be caused by effects on the autonomic nervous system.

Clinical Neuroscience

Valproic acid associated pleuropericardial effusion: case report

DEMIR Figen Ulku

Introduction - Valproic acid is an effective antiepileptic and mood stabilizer used in the treatment of many neurological and psychiatric disorders. Although there are frequently seen side effects, effusions between layers of pleural and pericardial membranes are rare to be seen. Case - Pleuropericardial effusion was detected in a 23 years old woman who was under valproic acid treatment because of epileptic seizure. After 1 year of valproic acid treatment, patient complained of dyspnea. As all the researches intended on etiology were usual, valproic acid has been thought to be responsible for the matter. Control examination after 1.5 months regarding the end of treatment revealed complete recovery of pleuropericardial effusion. Discussion - Pleural and pericardial effusions are rarely seen complications related to the use of valproic acid. It must also be kept in mind that valproic acid causes a potential for such side effects which can be blamed etiologically when the other possibilities for patients are excluded.