Hypertension and nephrology

[Hypertension and atrial fibrillation. Part 1. - Epidemiological data. The pathomechanism of PF in hypertension]

KÉKES Ede

OCTOBER 20, 2018

Hypertension and nephrology - 2018;22(05)

[Atrial fibrillation (PF) is the most common arrhythmia on the basis of analyzes conducted in different regions of the world. The main reason for this is the aging of the population. High blood pressure is one of the major factors of mortality in both developed and poor economical countries. The combined presence of the two diseases presents many hazards to our body. The most significant of these is the development of thromboembolic stroke, which is constantly increasing with age. The author analyzes in detail the aetiology called atrial cardiomyopathy, behind which there are complex structural, architectural, contractile and electro-physiological changes and leads to clinical manifestation of PF.]

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[The importance of recognition and proper treatment of hypertension and the maintenance of adherence in hypertension care]

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[Hypertension is the leading cause of death and disability-adjusted life years. In the United States hypertension accounts for more cardiovascular (CV) deaths than any other modifiable CV disease risk factor and was second only to cigarette smoking as a preventable cause of death for any reason. In our country the situation is similar. In Hungary the number of subjects with hypertension is approximately 3.5 million and this high prevalence contributes markedly to the poor Hungarian CV morbidity and mortality figures. The recognition of hypertension, the initiation of drug therapy and the long-term follow- up of the patients is mainly the task of primary care. Besides that it inheres high responsibility, this is also a grateful commitment, as hypertension in most of the cases can be treated properly with lifestyle-changes and medications leading to a marked decrease of CV complications, especially stroke. In our review article we would like to focus on the high prevalence of hypertension worldwide as well as in our country, the exact implementation of screening, the risk reduction potential of the proper treatment and the importance of the long-term maintenance of treatment adherence.]

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HARIS Ágnes, TISLÉR András, ONDRIK Zoltán, FILE Ibolya, MÁTYUS János, ZSARGÓ Eszter, DEÁK György, AMBRUS Csaba

[Launching the Hungarian Vasculitis Registry aimed to collect information about prevalence and outcome of our patients with ANCA-associated vasculitis, and treatment protocols of the disease. The on-line data collection has been developing dynamically since its initiation five years ago, presently 278 patients’ files are available. Patients’ mean age is 58.2±14.5 years, 62% are women; their disease is associated with c-ANCA positivity in 51% and p-ANCA in 49%. At diagnosis GFR was 24.6±21.6 ml/min/1,73 m2, that time 29%, during the total follow up 39% of the registered subjects needed dialysis. Renal replacement therapy could be discontinued in 23% of them. In cases with focal histological changes, also with upper respiratory tract and skin involvement dialysis was significantly less frequently necessary, which underlines the importance of early diagnosis. In induction therapy steroid was administered for 94% of the patients, 85% of them got cyclophosphamide, 59% was treated by plasmapheresis, 11% got rituximab. Maintenance treat ment contained steroid in 80%, per os cyclophosphamide in 23%, parenteral cyclophosphamide in 22%, furthermore 40% of the patients got azathioprin, 8 subjects got mycophenolate and 6 got methotrexate. Median follow up was 30 months (IQR 6-78), during which period 20% of the patients died, 5% got kidney transplantation, and 5% were lost to follow up. Median survival was 14.8 years, five years survival was 85%, and ten years survival was 70%. Long term survival in patients with c-ANCA vasculitis seemed better comparing to p-ANCA vasculitis, but when correcting by age this difference disappeared. Predictors of death were age and dialysis dependent renal failure. Relapses developed in 27% of patients, 28% of them presented in the first year, 21% suffered it after five years of care. Collected data by the Hungarian Vasculitis Registry shows our society’s successful professional activity. Our results are comparable to the published data in the literature, yet there are several areas in our care where further improvements are warranted in order to increase our patient’s survival and quality of life.]

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[Introduction: Stroke is one of the leading causes of death and disability, therefore is an important public health concern. 20% of ischaemic cerebrovascular diseases are casued by cardiac-related embolism, wiith non-valvular atrial fibrillation (AF) as a major cause, and results in approximately 3-5-fold risk improvement. The aim of this study is to introduce the CHADS2-VASc scoring system, as an important tool in the estimation of stroke risk in AF patients. Recognition of AF and initiation of adequate therapy is a crucial step in the prevention of serious complications. The best-known indexes for AF’s vascular effects are HAS-BLED and CHADS2-VASc. According to European Society of Cardiology, CHADS2-VASc is recommended to use in every AF case with stroke risk, when direct anticoagulant therapy could be implemented. A nurse can work on stroke risk reduction among AF patients in various levels and competences. Primary prevention and health promotion is a responsibility for every health care worker, but at the same time, Advenced Practice Nurse could have a role either in diagnostics or initiating proper therapy.]

Clinical Neuroscience

L-arginine pathway metabolites can discriminate paroxysmal from permanent atrial fibrillation in acute ischemic stroke

CSÉCSEI Péter, VÁRNAI Réka, NAGY Lajos, KÉKI Sándor, MOLNÁR Tihamér, ILLÉS Zsolt, FARKAS Nelli, SZAPÁRY László

Background - Atrial fibrillation (AF) is the most common arrhythmia diagnosed in clinical practice. We aimed to measure the L-arginine pathway metabolites as well as their ratios in patients with different types of AF or sinus rhythm and to explore the relationship among the markers and clinical variables in the subacute phase of acute ischemic stroke (AIS). Methods - A total of 46 patients with AIS were prospectively enrolled. The patients were divided into three groups based on diagnosis of either sinus rhythm, paroxysmal or permanent AF. Plasma concentration of the L-arginine pathway metabolites were analyzed at post-stroke 24 hours in the three rhythm groups. Besides, clinical variables and laboratory data were recorded. Results - Asymmetric dimetylarginine (ADMA) was significantly higher in patients with permanent AF compared to sinus rhythm (p<0.001). Both ADMA (p<0.001) and symmetric dimethylarginine (SDMA) (p<0.002) at 24 hours were significantly higher among patients with permanent AF compared to those with paroxysmal AF. The L-arginine/SDMA (p<0.031) ratios at 24 hours were significantly higher among patients with sinus rhythm compared to those with permanent AF. ROC analysis also revealed that plasma SDMA cut-off level over 0.639 μmol/L discriminated permanent AF from paroxysmal AF or sinus rhythm with a 90.9% sensitivity and 77.1% specificity. Neutrophil-lymphocyte ratio also showed significantly higher value in individuals with both paroxysmal and permanent AF (p=0.029). Conclusions - Plasma level of SDMA could discriminate permanent from paroxysmal AF in the subacute phase of ischemic stroke. In addition, an increased neutrophil-lymphocyte ratio may suggest inflammatory process in the evolution of atrial fibrillation.

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Clinical Neuroscience

[Efficacy of anticoagulation with vitamin K antagonists in acut stroke patients with atrial fibrillation - Hungarian results]

SAS Attila, CSONTOS Krisztina, LOVÁSZ Rita, VALIKOVICS Attila

[Background and objective - An estimated 20% of ischemic strokes are of cardiogenic origin, half of which is associated with atrial fibrillation (AF). Anticoagulation treatment of patients with this arrhythmia reduces their risk of stroke. Effectiveness and safety of oral anticoagulant therapy with vitamin K antagonists (VKA) is limited, however, by their well-known narrow therapeutic window and the substantial inter- and intraindividual variability of INR values depending on genetic and dietary factors as well as drug interactions. Our objective was to evaluate the prevalence of adequate anticoagulation and the level of anticoagulant effect actually achieved among patients with AF hospitalized for acute stroke. Methods - Patients with AF admitted to our hospital ward in 2012 for acute stroke (n=226) were included in the analysis. Using descriptive statistics, relevant clinical and therapeutic characteristics of the patients were assessed, with special reference to the INR values on admission (among patients with known AF), and the clinical outcomes. Results - Of the study cohort, 170 patients had a diagnosis of AF before the admission for stroke, but 47% of them did not take anticoagulants. Patients who suffered stroke while on anticoagulants (83 on VKA, 7 on low-molecular-weight heparins), were in most cases (75%) out of the therapeutic INR range, typically undertreated (INR<2). Overall, inadequate or completely absent anticoagulation was documented in 81% of the stroke cases occurring in patients with known AF. Of the entire study cohort, 41% was discharged home, 34% required continued institutional care, and 25% died. Conclusions - The inadequacy or lack of anticoagulation was observed in the vast majority of acute strokes in patients with known AF. These cases are often related to the well-documented limitations of VKA therapy in terms of its safety, tolerability and/or practical aspects. To prevent them, important changes are warranted in the anticoagulation practice, including the closer control of VKA therapy and the broader use of new oral anticoagulants.]