Hypertension and nephrology

[The clinical significance of peripheral and central blood pressure form the neurologist’s point of view]

BERECZKI Dániel, VASTAGH Ildikó

FEBRUARY 28, 2011

Hypertension and nephrology - 2011;15(01)

[Hypertension - affecting both the large and the small cerebral vessels - is the most frequent risk factor for cerebrovascular disorders manifesting in stroke, hypertensive encephalopathy or vascular dementia. The central pressure measured at the proximal part of the aorta has more important role in the development of vascular hypertrophy and carotid atherosclerosis than the pressure measured in the brachial artery. Central aortic pressure more accurately reflects the filling conditions of the left ventricle and thus the pressure conditions affecting the cerebral vascular system, than brachial pressure values, therefore possibly predicts more reliably the risk of cardiovascular events than brachial pressure values. Features of the stiffness of large arteries (like pulse wave velocity) more directly reflect the chronic effect of ageing, hypertension and diabetes than brachial or even central aortic pressure. Therefore in upcoming clinical trials arterial stiffness and central aortic pressure should be considered as possible surrogate endpoints. Antihypertensive treatment is an important part of primary and secondary stroke prevention. Decreasing blood pressure in hypertensive subjects significantly decreases the risk of stroke and other vascular events, and the extent of risk reduction primarily depends on the extent of the decrease in blood pressure. Several factors should be considered when choosing from treatment options. The use of traditional β blockers - partly due to their smaller effects on central blood pressure - decreased recently. Further observations will decide on the role of third generation β blockers in the prevention of cardiovascular mortality and morbidity.]

COMMENTS

0 comments

Further articles in this publication

Hypertension and nephrology

[Scylla and Charybdis - the treatment of hypertension]

RADÓ János

Hypertension and nephrology

[The effect of antihypertensive drugs on central blood pressure]

PÁLL Dénes, KOMONYI Éva, LENGYEL Szabolcs, PARAGH György, KATONA Éva

[It is well known, that there is a difference between peripheral and central systolic and pulse pressure. As the pressure wave travels distally from the heart, there is a significant increase, which is called pressure amplification. Central blood pressure can be measured easily and non-invasively, and the result shows a positive correlation with cardiovascular end-points. Several antihypertensive drugs can differently decrease central and peripheral blood pressure. The effect of diuretics on central systolic and pulse pressure is neutral or negative. While traditional β-blockers (e.g. atenolol) have a definitive negative effect, nebivolol shows a positive one. The calcium antagonists tend to have a favorable effect, while the clear beneficial effect of the angiotensin converting enzime inhibitors is well documented. There are only few data on angiotensin receptor blockers, however, the results seem to be promising.]

Hypertension and nephrology

[Direct renin inhibitors]

FARSANG Csaba

[The mechanisms of action of direct renin inhibitors and the important clinical findings gained by the first, clinically approved drug, aliskiren are discussed. The relative lack of side effects and the very long-lasting antihypertensive action of aliskiren is emphasized. Investigations showing efficacy and protective effects of aliskiren and its combinations with other antihypertensive drugs (diuretics, calcium antagonists, angiotensin converting enzyme inhibitors, angiotensin receptor blockers) against hypertension-induced subclinical organ damage as well as still ongoing clinical trials are also described.]

Hypertension and nephrology

[Importance, prevalence and therapy of vitamin D deficiency]

SZABÓ András

[Annual citations in the PubMed database on vitamin D were approximately 5000, this represents a doubling in the last decade and a 20% increase in the last year. There is renewed interest in vitamin D synthesis, metabolism and action. The two principal reasons for increased interest can be: 1. new knowledge regarding the nonhormonal, autocrine, and paracrine actions of 1,25-dihydroxylated vitamin D metabolites in man, 2. the worsening, worldwide trend to vitamin D insufficiency. Clinical vitamin D research in last years has confirmed the presence of a worldwide problem of vitamin D depletion, a problem that appears to be worsening. Largescale population based studies bear out long-held concerns that low serum 25(OH)D levels are associated with a number of adverse outcomes in the human musculoskeletal, innate immune, and cardiovascular systems. In fact, low vitamin D levels are significantly associated with all-cause mortality in the U.S. population and Hungary respectively. It is hypothesized that the global rise in incidence of obesity contributes to the worsening of the problem of vitamin D deficiency, amplifying adverse impacts on the host skeleton, immunoreactivity to microbes, and metabolic status. Finally, it should be remembered that treatment of vitamin D deficiency has two phases: restoration of 25(OH)D levels up to more than 30 ng/ml; and maintenance of the serum 25(OH)D level in that range. The present upper level (UL) of vitamin D intake that is deemed to be safe (2000 IU/day) must be re-evaluated considering data acquired over the past 15 years.]

Hypertension and nephrology

[The importance of epithelial-mesenchymal transition in kidney fibrosis]

NAGY SZAKÁL Dorottya, SZEBENI Beáta, SZIKSZ Erna, HIMER Leonóra, REUSZ György, VÁSÁRHELYI Barna, TULASSAY Tivadar, VANNAY Ádám

[Epithelial-mesenchymal transition (EMT) plays a central role in physiological and pathological processes of embryogenesis, carcinogenesis and tissue fibrosis. During EMT epithelial cells may transform to myofibroblasts, which are the effector cells of fibrosis. In our summary the process of EMT and its medical importance will be reviewed in relation to renal fibrosis. Regardless of the initiating cause the final common mechanism of organ fibrosis is similar in the different chronic renal diseases. It always involves major inflammatory responses, however the molecular mechanisms involved are still elusive. The EMT now takes centre stage as the point of convergence between inflammation and the progression of degenerative fibrotic diseases. Understanding the pathomechanism of EMT and the significance of signalling pathways involved in this process may lead to a new therapeutic approach in the treatment of chronic renal diseases.]

All articles in the issue

Related contents

Lege Artis Medicinae

[Insulin: alfa and omega]

KIS János Tibor, BALOGH Bernadett, KISS Zsófia, SCHANDL László

[Type 1 diabetes (T1DM) is caused by the autoimmune death of insulin-producing β-cells. In the background there is by all probability the primary antigen (if the theory of primary antigen is correct) the insulin itself or the proinsulin. However, treatment of T1DM is virtually equivalent to the insulin treatment. The earlier we recognize T1DM and start treatment, the better gly­caemic results we achieve, the more likely we can maintain all functional β-cell stocks. Insulin also plays a key role in the immunopathogenesis, development and treatment of T1DM, thus insulin is the alpha and omega in this condition.]

Lege Artis Medicinae

[Ways of treatment in traditional, complementary and integrative medicine of COVID-19]

SZÔKE Henrik, DARÓCZI Zoltán, VERZÁR Zsófia

[This study presents the results and expert opinions about the most important, amply evidence based, most widespread and af­fordable therapeutic procedures and supp­lementary preparations, which may support or and possibly replace conventional treatments. Traditional, complementary, and integrative medicine offers a number of options to enhance physical, psychic and mental resilience that may also be useful in the prevention and treatment of COVID-19 patients. It will be worthwhile to analyse the evidences of clinical experiences on potential benefits. This brief summary might serve as a useful starting point for further research on this topic.]

Hypertension and nephrology

[Effect of beta-blockers with or without vasodilating properties on central blood pressure]

BENCZÚR Béla

[Beta-blockers are more and more excluded as frist-line option in recent hypertension guidelines – they are mainly used in the case of compelling indication. However beta-blockers are not a homogeneous drug-class as several differences exist between them regarding their effect on metabolism or vasoconstriction/vasodilation. The clinical implication of central blood pressure has recently arisen into the focus of interest in the light of the fact that different antihypertensives exert different effect on central blood pressure. The theory of ”stiffness-gradient” may help us to deepen our knowledge regarding the physiology of central blood pressure. Several studies investigated the effects of different beta-blockers on central blood pressure. Based on the unique effect of beta-blockers with vasodilating properties it can be emerged to form this group of drugs as a new antihypertensive class. ]

Hypertension and nephrology

[Changes in systolic blood pressure in the Hungárián aduit population between 2010 and 2018 based on public health screening data]

KÉKES Ede, BARNA István, DAIKI Tenno, DANKOVICS Gergely

[Using our mobile public health screening system, we examined the changes in systolic blood pressure averages and systolic pressure distribution between 2010 and 2018 by analyzing the data of 72,857 women (mean age 42.3±13.9 years) and 61,563 mén (mean age 42.2±13.9 years) in three consecutive time periods. The SBP averages have been gradually and significantly decreased since 2010 in all age groups. The parametric and non-parametric characteristics of the systolic distribution curves alsó showed a favorable change during the indicated period. The observed changes may indicate that the primary and secondary prevention, as well as the treatment of hypertension and the physician-patient cooperation in Hungarywere successful in the indicated period.]

Clinical Neuroscience

[Dizziness - vertigo Warning symptoms in vertebrobasilar ischemia - Part I. ]

FAZEKAS András

[Dizziness and vertigo - like headache - are the most common complaints which leads patients to visit the doctor. In spite of the headache - which may be primary (e.g. migraine) or symptomatic - dizziness and vertigo do not appear to be a separate nosologic entity but rather the symptoms of several neurological disorders. For differential diagnosis, interdisciplinary thinking and activity is needed because the vestibular, neurological and psychiatric disorders might have a common role in the development of symptoms and further overlapping can also occur. The vascular disorders of the vertebrobasilar system are discussed in detail in this review. The importance, occurrence and causes of vertigo as a warning symptom is in the focus. The author draws attention to life-threatening conditions with acute onset in cases of the posterior scale ischemia and emphasizes the importance of the correct and early diagnosis. The author tries to clear up the nihilistic aspect in treating of stroke and stresses the necessity of thrombolysis and interventional radiological procedures which may be the only chance for the recovery of the patients. The pharmacological prevention of recurrent vascular events is also important and obligatory for the clinicians.]