Search Results
Results 451 - 500 of 1819
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Berthet Karine - - 2010
The challenge in acute stroke is still to reperfuse as early as possible the ischemic territory. Since fibrinolytic therapies have a limited window with potential risk of bleeding, having a nonpharmacologic mean to recruit vessels in area surrounding necrosis might be useful. We propose here to use antigravity suit inflated ...
Wen Yang - - 2010
A high red blood cell distribution width (RDW) may be associated with adverse outcomes in patients with heart failure and risk of death, and cardiovascular events in people with previous myocardial infarction. Ultrasound detection of carotid plaque helps to identify asymptomatic patients with advanced subclinical atherosclerosis, which can predict risk ...
Hsu Tzu-Chao - - 2010
Hypotension is frequently reported during hemodialysis. This study aimed to examine the effect of the intermittent pneumatic circulator on blood pressure during hemodialysis. Sixteen subjects with chronic hemodialysis were recruited. Each subject randomly received two test conditions on separate days, hemodialysis with and without the circulator. The circulator was applied ...
Kougias Panagiotis P Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX, USA. - - 2010
Hypertension is a multifactorial disease associated with significant morbidity. Increased sympathetic nervous system activity has been noted as an important etiologic factor and is, in part, regulated by afferent input arising from arterial and cardiopulmonary baroreceptors, activation of which causes inhibition of sympathetic output. It was thought for many years ...
Sommer Gerhard - - 2010
Specimens of intact wall tubes of human common carotid arteries (CCA), internal carotid arteries (ICA) (n = 11, age 77.6 yr, SD 6.3), and related adventitia and media-intima tubes are mechanically examined. Cyclic, quasi-static extension-inflation tests at different axial stretches are performed on preconditioned tube specimens. Stress-free configurations show significant ...
McCleskey Edwin W - - 2009
The reflex that provides rapid neural control of blood pressure is triggered by an unknown molecular pressure sensor. ASIC2, an ion channel in a family that includes a mechanosensor from C. elegans, is shown by Lu et al. in this issue of Neuron to be critical for this reflex in ...
Lu Yongjun - - 2009
Arterial baroreceptors provide a neural sensory input that reflexly regulates the autonomic drive of circulation. Our goal was to test the hypothesis that a member of the acid-sensing ion channel (ASIC) subfamily of the DEG/ENaC superfamily is an important determinant of the arterial baroreceptor reflex. We found that aortic baroreceptor ...
Klawe J J - - 2009
Our previous study demonstrated that selective carotid baroreceptors activation decreases airway resistance. The aim of the present study was to evaluate the effect of carotid baroreceptor inactivation on the reflex change of respiratory resistance. Twenty healthy men aged between 20 and 25 were included in the study. Selective inactivation of ...
Menees Spencer - - 2010
BACKGROUND: There is paucity of research looking at variations in carotid artery intima-media thickness (CIMT) during the cardiac cycle in children. The aim of this study was to ascertain variations, if any, in CIMT during the cardiac cycle in a population of high-risk children. METHODS: Forty-nine children aged 6 to ...
Kirin Ivan - - 2009
Resistant hypertension is defined as hypertension that remains above 140/90 mmHg despite the provision of three or more antihypertensive drugs in a rational combination at full doses and including a diuretic. It is associated with adverse clinical outcome and therefore requires aggressive medical treatment. We present a case of 70-year-old ...
Yamato Y - - 2009
We have studied the effect of pressure on the anomalous lattice striction, both in the ab-plane and along the c-axis, of (La,Pr)(1.2)Sr(1.8)Mn(2)O(7) single crystals over the temperature region where the paramagnetic insulator to ferromagnetic metal transition takes place. We have examined the temperature dependence of the resistivity and the magnetization ...
Eberth John F JF Department of Biomedical Engineering and M.E. DeBakey Institute, - - 2009
Arteries experience marked variations in blood pressure and flow during the cardiac cycle that can intensify during exercise, in disease, or with aging. Diverse observations increasingly suggest the importance of such pulsatility in arterial homeostasis and adaptations. We used a transverse aortic arch banding model to quantify chronic effects of ...
DeLoach Stephanie S SS Department of Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania, - - 2009
Patients with chronic kidney disease (CKD) have a disproportionate risk of cardiovascular disease. This study was designed to assess the association between two noninvasive measures of cardiovascular risk, pulse wave analysis (PWA), and carotid intima-media thickness (IMT), in a cohort of CKD patients enrolled in the Chronic Renal Insufficiency Cohort ...
Guntekin Unal - - 2010
BACKGROUND: Endothelial dysfunction is considered the first stage in the development of atherosclerosis. Brachial artery flow-mediated dilatation (FMD) has been used to assess endothelial dysfunction. An impaired FMD response may reflect a vascular phenotype prone to atherosclerosis. The thickness of the common carotid intima-media (CIMT) as measured by ultrasound represents ...
Machon Denis - - 2009
Rb(2)ZnCl(4) in the normal phase (T = 308-313 K) has been studied under pressure by means of single-crystal x-ray diffraction up to 3.84 GPa and Raman spectroscopy up to 5.9 GPa. No pressure-induced phase transition has been observed but an orientational disorder of the tetrahedra is enhanced with the pressure. At the same ...
Pommer Bernhard - - 2009
PURPOSE: To evaluate a novel surgical technique for flapless transcrestal elevation of the maxillary sinus floor via surgical templates using gel pressure. MATERIALS AND METHODS: Computed tomographic scans of fresh human cadaver maxillae and three-dimensional treatment planning software were used to design surgical templates. Access to the maxillary sinus was ...
Manisty Charlotte - - 2009
Hydroxymethylglutaryl-CoA reductase inhibitors (statins) reduce cardiovascular events in hypertensive subjects, but their effect on carotid BP, pressure augmentation, and wave reflection is unknown. We compared the effect of atorvastatin with placebo in a substudy of the lipid-lowering arm of the Anglo-Scandinavian Cardiac Outcomes Trial (ASCOT-LLA). Hypertensive patients (n=142; age=43 to ...
Boutcher Yati N - - 2009
Vascular and baroreceptor abnormalities in 44 young males, mean age 21 years, comprising of offspring with (FH(+); n = 22) and without (FH(-); n = 22) hypertensive parents, were investigated. Peak forearm blood flow (FBF), which was defined as the highest blood flow obtained following reactive hyperaemia, was assessed using ...
Manisty Charlotte H - - 2009
Antihypertensive agents may differ in their effects on central systolic blood pressure, and this may contribute to treatment-related differences in cardiovascular outcomes. In a substudy of the Anglo-Scandinavian Cardiac Outcome Trial, we investigated whether directly measured carotid systolic blood pressure differed between people randomized to amlodipine- and atenolol-based therapies and ...
Brøndum E - - 2009
How blood flow and pressure to the giraffe's brain are regulated when drinking remains debated. We measured simultaneous blood flow, pressure, and cross-sectional area in the carotid artery and jugular vein of five anesthetized and spontaneously breathing giraffes. The giraffes were suspended in the upright position so that we could ...
Pawlus S - - 2009
This work was motivated by ostensibly contradictory results from different groups regarding the effect of pressure on the fragility of glycerol. We present new experimental data for an intermediate pressure regime showing that the fragility increases with pressure up to about 1.8 GPa, becoming invariant at higher pressures. There is no ...
Segers Patrick - - 2009
Central-to-peripheral amplification of the pressure pulse leads to discrepancies between central and brachial blood pressures. This amplification depends on an individual's hemodynamic and (patho)physiological characteristics. The aim of this study was to assess the magnitude and correlates of central-to-peripheral amplification in the upper limb in a healthy, middle-aged population (the ...
Liu Yong - - 2009
First-principles pseudopotential calculations by means of the local density approximation (LDA) within density-functional theory (DFT) are carried out to investigate the negative pressure induced ferroelectric phase transition in rutile TiO(2) in the range of -25 to 25 GPa. The softening behavior of the A(2u)(TO) modes at the Γ point following the ...
da Silva L M - - 2009
We report on pressure effects on the magnetic and magnetocaloric properties of the compound UGa(2). Using a mean field approximation, we were able to calculate the isothermal entropy change and the adiabatic temperature change. Neither the applied pressure nor the chemical substitution experiments within the ranges studied revealed a remarkable ...
Cift?i Ozg?r - - 2009
OBJECTIVES: We investigated possible acute effects of mentholated versus nonmentholated cigarette smoking on vascular functions and left ventricular diastolic functions in otherwise healthy young smokers. STUDY DESIGN: The study included 20 otherwise healthy smokers (6 women, 14 men; mean age 25.6 years) and 22 healthy nonsmokers (12 women, 10 men; ...
Del Paso Gustavo A Reyes - - 2009
This study explored the effects of tonic blood pressure on the association between baroreceptor cardiac reflex sensitivity and cognitive performance. Sixty female participants completed a mental arithmetic task. Baroreceptor reflex sensitivity was assessed using sequence analysis. An interaction was found, indicating that the relationship between baroreceptor reflex sensitivity and cognitive ...
Mahlik S - - 2009
We investigated the single crystals of LiBaF(3) doped with Eu(2+) using high pressure spectroscopy, where high pressure was applied in a diamond anvil cell. Photoluminescence, time-resolved luminescence and luminescence kinetics at pressures from ambient to 200 kbar and at temperatures from 10 K to ambient were studied. At ambient conditions the luminescence ...
Kakou Augustine - - 2009
Meta-analyses of antihypertensive therapy suggest that, independently of blood pressure (BP) level, stroke prevention is influenced mainly by calcium-entry blockers (CEB) and cardiac risk prevention by angiotensin-converting enzyme inhibitors (ACEIs). The possibility that central systolic and pulse pressure (PP) reduction differs between the two drug classes for the same mean ...
Cristalli A - - 2009
BACKGROUND: This study compares ropivacaine and levobupivacaine when administered for cervical plexus block. The authors therefore compared the arterial pressure profile and the incidence of hypotension between drugs. METHODS: Forty-eight patients scheduled for carotid artery surgery (American Society of Anesthesiologists [ASA] 2-3) were randomly assigned to receive levobupivacaine or ropivacaine ...
Medvedev S A - - 2009
We studied lithium azide (LiN(3)) by x-ray diffraction and Raman spectroscopy at hydrostatic compression up to pressures above 60 GPa at room temperature. The results of x-ray diffraction analyses reveal the stability of the ambient-pressure C 2/m crystal structure up to the highest pressure. The pressure dependence of librational modes provides ...
Miki Kenju - - 2009
The aim of the present study was to investigate how loading of cardiopulmonary baroreceptors induced by water immersion (WI) modifies baroreflex control of renal sympathetic nerve activity (RSNA) in conscious dogs. Nine dogs were chronically instrumented for measuring carotid sinus nerve activity (CSNA), RSNA, carotid arterial (Pca), and central venous ...
Fujisawa Michio - - 2009
Azelnidipine, a dihydropyridine calcium channel blocker unlike other dihydropyridine calcium channel blockers, does not increase but slightly decreases heart rate (HR) in clinical settings. In the present study, the mechanism for the HR-lowering action characteristic of azelnidipine was investigated in anesthetized dogs. In the in situ perfused sinus node preparation, ...
Doumas Michael - - 2009
BACKGROUND: The role of the carotid baroreflex in blood pressure regulation has been known for a long time but its effects were thought to be short lived. Recent data indicate that stimulation of carotid baroreceptors may lower blood pressure not only for short periods of time, but also in the ...
Suzuki Yoshiharu - - 2009
We perform volumetric measurements of LiCl aqueous solution up to 1.00 GPa in the 100-170 K range, examine the pressure-induced vitrification and densification, and draw the pressure-temperature-volume surface. The pressure-induced vitrification of the solution corresponds to the cooling-induced vitrification of the liquid. We found that the volumetric decrease of glassy solution during ...
Raitakari Olli T - - 2009
BACKGROUND AND PURPOSE: Large pulse pressure associates with atherosclerosis, but it is unclear if it contributes to the development of atherosclerosis or if atherosclerosis leads to pulse pressure widening. We examined whether exposure to large pulse pressure in childhood predicts carotid artery intima-media thickness in adulthood. METHODS: Carotid intima-media thickness ...
Stoneham M D - - 2009
Acute perioperative changes in arterial pressure occur frequently, particularly in patients with cardiovascular disease or those receiving vasoactive medications, or in relation to certain cardiovascular surgical procedures. Both hypo- and hypertension are common in patients undergoing carotid surgery because of unique patho-physiological and surgical factors. Poor arterial pressure control is ...
Cooper Victoria L - - 2009
A neck chamber device for stimulation of carotid sinus baroreceptors by changing carotid transmural pressure was first described in 1957 by Ernsting and Parry and, with several modifications, has been extensively used in a number of physiological and clinical studies. This article outlines the evolution of neck chamber devices and ...
Heffernan Kevin S - - 2009
Increased carotid intima-media thickness (IMT) with aging is a significant predictor of mortality. Older endurance trained (ET) individuals have lower carotid artery stiffness but similar carotid IMT when compared to sedentary (SED) age-matched peers. The purpose of this study was to examine the contribution of arterial wave reflections to carotid ...
Natale Francesco - - 2009
AIMS: Relationship between obesity and cardiovascular (CV) disease depends not only on the amount of body fat, but also on its distribution. For example, individuals with increased fat accumulation in the abdominal region have atherogenic lipid profiles and are at increased CV risk. The loss of elasticity in medium and ...
Uppuluri Sarada C - - 2009
Despite therapy with multiple optimally dosed medications, hypertension remains poorly controlled in a sizeable number of people worldwide. This has spurred interest in exploring other pharmacologic and nonpharmacologic options for treatment. The carotid baroreceptors are important in regulating blood pressure in chronic hypertension by centrally mediated sympathoinhibitory effects and other ...
Georgakopoulos Dimitrios - - 2009
We investigated the effects of the carotid sinus baroreflex on coupling of the left ventricle (LV) and the arterial system in twelve anesthetized dogs, with all nerves and carotid sinus circulation intact and instrumented to measure LV pressure and volume. The Rheos(R) device was used to directly electrically stimulate the ...
Marks Wojciech - - 2009
Gunshot injuries are quite common nowadays. Increasing numbers of high-pressure injection injuries are also being observed with a good correlation with industrial progress. High-pressure devices produce pressures and velocities of fluid streams similar to those generated in firearms. However, no missile plays a part in high-pressure injection injuries. We present ...
Lonergan Roisin - - 2009
Two Irish women presented with difficulty in completion of hair straightening, limited by upper limb dysaesthesiae due to claudication or brachial plexus entrapment induced by sustained shoulder abduction beyond 90 degrees. The first described arm pain precipitated by elevation and sustained abduction above shoulder level, particularly while using her GHD ...
Liu Jiangqin - - 2009
INTRODUCTION: Little information is available regarding the temporal changes in hemodynamics and blood gases during the development of a moderate pneumothorax in a neonate. In this study, we aim to investigate the temporal changes of hemodynamics and arterial blood gases in a neonatal swine model of unilateral pneumothorax. STUDY DESIGN: ...
Zapata Patricio - - 2009
Searching for an arterial chemosensory drive exerted upon the cardiovascular system under eucapnic normoxia, we performed experiments on spontaneously ventilated, pentobarbitone-anesthetized cats, in which ventilatory flow through a pneumo-tachograph, instantaneous respiratory frequency, end-tidal pressure of CO(2), arterial pressure, and instantaneous heart frequency were simultaneously recorded. Repeated exposures to 100% O(2) ...
Al-Nimer Marwan S M - - 2009
Patients with type-2 diabetes mellitus have greater carotid intima media thickness and they are at risk for generalized atherosclerosis. This study aimed to compare the thickness of carotid artery intima media in type-2 diabetes mellitus patients with and without nonblood pressure component metabolic syndrome. This was a comparative observational study ...
Soy Mehmet M Department of Internal Medicine-Rheumatology, Abant Izzet Baysal University Faculty of Medicine, Bolu, - - 2009
In this study we analyzed the susceptibility to atherosclerosis of patients with psoriasis and psoriatic arthritis (PsA) by determining the femoral-carotid pulse wave velocity (PWV), which is a measure of the viscoelastic properties of blood vessels. The study included 25 patients with psoriasis (age 18-63 years, 13 male), of whom ...
Lindqvist Helen M - - 2009
INTRODUCTION: Increased intake of the n-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) has been shown to decrease the risk for cardiovascular death and to reduce CVD risk factors. It has also been suggested that EPA and DHA reduce atherosclerosis progression, but data are inconclusive. Carotid intima-media thickness ...
Scott, Christine Sharon
Studies in rat, dog and human show that changes in blood volume influence the relationship between plasma osmolality and plasma arginine vasopressin (AVP) concentration. It has not been proven whether the change in blood volume acts through stimulation of the low pressure receptors or arterial baroreceptors or both. The purpose ...
Aksoy Resul - - 2009
A high pressure angle dispersive synchrotron x-ray diffraction study of titanium disulfide (TiS(2)) was carried out to pressures of 45.5 GPa in a diamond-anvil cell. We observed a phase transformation of TiS(2) beginning at about 20.7 GPa. The structure of the high pressure phase needs further identification. By fitting the pressure-volume data ...
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