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Results 201 - 250 of 1833
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Theilade Simone - - 2013
OBJECTIVE: Central blood pressure may be a better risk marker than brachial blood pressure and can be measured noninvasively by tonometric devices. We investigate whether tonometric measurements are feasible in patients with diabetes and whether the degree of albuminuria or increased arterial stiffness affects measurements. PATIENTS AND METHODS: In 676 ...
Xu Chong-En - - 2013
OBJECTIVES: To investigate effects of high-dose ulinastatin on the release of proinflammatory cytokines and lung injury in patients with aortic dissection after cardiopulmonary bypass (CPB) under deep hypothermic circulatory arrest (DHCA). DESIGN: A prospective, randomized and double-blinded study. SETTING: A teaching hospital. PARTICIPANTS: Thirty-six patients with acute type-A aortic dissection ...
Wang Jiun-Jr - - 2013
BACKGROUND: Impedance cardiography (ICG) is a noninvasive technique used to estimate left ventricular (LV) stroke volume (SV) using thoracic impedance (ΔZ). It remains controversial, partly because ICG parameters have not been successfully related to hemodynamic events. We hypothesized that the change in ΔZ may be proportional to the variation in ...
Chopard Romain - - 2013
Two-dimensional transthoracic echocardiography (2D-TTE) is the reference technique for evaluating aortic stenosis (AS) but may be unreliable in some cases. We aimed to assess whether the use of a pressure wire to measure simultaneous transaortic gradient and aortic valve area (AVA) could be helpful in patients in whom initial noninvasive ...
Bahraseman Hamidreza Ghasemi - - 2013
The aim of this study was to measure the cardiac output and stroke volume for a healthy subject by coupling an echocardiogram Doppler (echo-Doppler) method with a fluid-structure interaction (FSI) simulation at rest and during exercise. Blood flow through aortic valve was measured by Doppler flow echocardiography. Aortic valve geometry ...
Nar Gokay - - 2013
This study has attempted to evaluate the relationship between aortic stiffness, blood pressure (BP) and serum endothelin-1 (ET-1) levels in patients with essential HT. Totally 152 subjects, consisting of 103 patients diagnosed with HT at least 1 year previously and 49 healthy individuals, were enrolled in this study. They were ...
Arjunon Sivakkumar - - 2013
The aortic valve (AV) experiences a complex mechanical environment, which includes tension, flexure, pressure, and shear stress forces due to blood flow during each cardiac cycle. This mechanical environment regulates AV tissue structure by constantly renewing and remodeling the phenotype. In vitro, ex vivo and in vivo studies have shown ...
Chen Duanduan - - 2013
Conservative medical treatment is commonly first recommended for patients with uncomplicated Type-B aortic dissection (AD). However, if dissection-related complications occur, endovascular repair or open surgery is performed. Here we establish computational models of AD based on radiological three-dimensional images of a patient at initial presentation and after 4-years of best ...
Nguy Lisa - - 2013
Rats with adenine-induced chronic renal failure (A-CRF) develop metabolic and cardiovascular abnormalities resembling those in patients with chronic kidney disease. The aim of this study was to investigate the mechanisms of hypertension in this model and to assess aortic stiffness in vivo. Male Sprague-Dawley rats were equipped with radiotelemetry probes ...
Bazemore Taylor C - - 2013
Abrupt onset of renal ischemia is associated with increased blood pressure (BP), but it is unknown whether BP remains elevated in patients with chronic severe atherosclerotic renal artery stenosis (RAS). Patients undergoing coronary angiography who had concurrent renal angiography were divided into 3 groups: severe (stenosis ≥70% diameter reduction), moderate ...
Stec David E DE Department of Physiology & Biophysics, Center for Excellence in Cardiovascular-Renal Research, University of Mississippi Medical Center, Jackson, Mississippi, USA. - - 2013
Moderate (approximately 2-fold) increases in plasma unconjugated bilirubin levels are able to attenuate the development of angiotensin II (Ang II)-dependent hypertension. To determine the specific role of decreases in superoxide production to the blood pressure-lowering effects of moderate hyperbilirubinemia (MHyB), we performed this study, in which the Nicotinamide adenine dinucleotide ...
Popescu Andreea Catarina - - 2013
Objectives: The left ventricular (LV) response to combined pressure and volume overload [aortic stenosis (AS) and aortic regurgitation (AR)] versus pressure overload (isolated AS) has not been systematically studied. We aimed to assess LV remodeling, functional and hemodynamic consequences in patients with mixed aortic valve disease versus patients with isolated ...
Moerman Annelies - - 2013
BACKGROUND:In this study, we compared the effects of 3 frequently used arterial blood pressure-regulating agents on brain (rScO2), renal (SrO2), and muscle (SmO2) oxygen saturation, during aortic coarctation repair in children. Based on the reported adverse effect of sodium nitroprusside (SNP) on left-sided rScO2 during aortic coarctation repair, we tested ...
Kamberi Lulzim Selim - - 2013
Abnormal aortic function in hypertension is generally attributed to accelerated breakdown of elastin in the aorta, leading to dilatation of the lumen and stiffening of the wall as elastin is replaced with stiffer collagen. Aortic stiffness is an independent predictor of cardiovascular risk and all-cause and cardiovascular mortality. Vascular stiffening ...
Maunganidze Fabian - - 2013
: To evaluate whether the relationship between early glomerular dysfunction and left-ventricular mass (LVM) occurs in a community sample and whether this relationship depends on haemodynamic factors. : In 621 randomly selected participants from a community sample (332 were normotensive), estimated glomerular filtration rate (eGFR), LVM and dimensions were determined ...
Fenton Pm - - 2013
Patient inflating valves combined with self-inflating bags are known to all anaesthetists as resuscitation devices and are familiar as components of draw-over anaesthesia systems. Their variants are also commonplace in transfer and home ventilators. However, the many variations in structure and function have led to difficulties in their optimal use, ...
Kanaki Aggeliki I - - 2013
BackgroundExperimental and clinical data suggest that statins exert anti-inflammatory and antiproliferative actions on vasculature beyond their lipid-lowering properties. Whether these pleiotropic effects of statins translate into a beneficial effect on arterial stiffness is not clear. This study aimed to evaluate the potential effects of low-dose atorvastatin treatment on arterial stiffness ...
Buys Roselien - - 2013
BACKGROUND: Patients who underwent surgery for aortic coarctation (COA) have an increased risk of arterial hypertension. We aimed at evaluating (1) differences between hypertensive and non-hypertensive patients and (2) the value of cardiopulmonary exercise testing (CPET) to predict the development or progression of hypertension. METHODS: Between 1999 and 2010, CPET ...
Alonso Alvaro A Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA. - - 2013
Hypertension is an established risk factor for atrial fibrillation. Understanding the association of blood pressure (BP) levels and aortic distensibility with P wave indices (PWIs) and PR interval, intermediate phenotypes of atrial fibrillation, could provide insights into underlying mechanisms. This analysis included 3180 men and women aged 45-84years participating in ...
Murakami Tomoaki - - 2013
Despite the apparently successful surgical repair of aortic coarctation, subsequent cardiovascular complications have sometimes been encountered. Aortic pressure wave reflection is one of the risk factors for developing cardiovascular diseases, and an enhancement of the pressure wave reflection has been reported in patients after aortic arch repair. To clarify this ...
McMahon Colin J - - 2013
A thirteen-year-old boy presented with severe systemic hypertension. His upper limb blood pressure measured 190/100mmHg and lower limb blood pressure measured 98/64mmHg. The brachial pulses were bounding and femoral pulses were not palpable. Echocardiography and magnetic resonance angiography confirmed middle aortic syndrome. There was severe diffuse thoraco-abdominal coarctation with continuous ...
Marom Gil - - 2013
OBJECTIVE: The aim of this study was to determine the influence of aortic annulus (AA) diameter and the ratio of the sinotubular junction (STJ) diameter to the AA diameter on aortic valve hemodynamics and tissue mechanics and to suggest optimal values. METHODS: Sixteen cases of aortic roots with AA diameters ...
Charonko John J - - 2013
For the left ventricle (LV) to function as an effective pump it must be able to fill from a low left atrial pressure. However, this ability is lost in patients with heart failure. We investigated LV filling by measuring the cardiac blood flow using 2D phase contrast magnetic resonance imaging ...
King Kevin S KS Department of Radiology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390, USA. - - 2013
To evaluate the relationship between pulse wave velocity (PWV) from the aortic arch and subsequent cerebral microvascular disease independent of other baseline cardiovascular risk factors among the participants in the multiethnic Dallas Heart Study. Each subject gave written consent to participate in this HIPAA-compliant, institutional review board-approved prospective study. Aortic ...
Bertram C D - - 2013
An existing lumped-parameter model of multiple lymphangions (lymphatic vascular segments) in series is adapted for the incorporation of recent physiological measurements of lymphatic vascular properties. The new data show very marked nonlinearity of the passive pressure-diameter relation during distension, relative to comparable blood vessels, and complex valve behaviour. Since lymph ...
Gaemperli Oliver - - 2013
BACKGROUND: Percutaneous mitral valve repair (MVR) with the MitraClip(TM) device has emerged as an alternative to surgery for treating severe mitral regurgitation (MR). However, its effects on left ventricular (LV) loading conditions and contractility have not been investigated yet. METHODS AND RESULTS: Pressure-volume (PV) loops were recorded throughout the MitraClip(TM) ...
Paranskaya Liliya - - 2013
Aims: The haemodynamic effect of mitral valve (MV) repair using multiple MitraClips® (MC) has not been investigated. The aim of the study was to evaluate the stress performance of MV repair with MC. Methods and results: Twenty consecutive patients (77±7 years, 13 men [65%]) after implantation of >2 MitraClips® were ...
Craiem D - - 2013
Aging produces a simultaneous thoracic aorta (TA) enlargement and unfolding. We sought to analyze the impact of hypertension on these geometric changes. Non-contrast computed tomography images were obtained from coronary artery calcium scans, including the entire aortic arch, in 200 normotensive and 200 hypertensive asymptomatic men. An automated algorithm reconstructed ...
Kiefer Todd L - - 2013
Invasive hemodynamic evaluation in the patient with a mechanical aortic valve has in the past required transseptal or apical left ventricular puncture in order to obtain left ventricular pressure measurements. Over the last few years, several case reports have described the feasibility of using a coronary pressure-sensing guidewire to cross ...
Lu Xiao - - 2013
AIMS:: This study investigates the effect of local mechanical stimulation induced by pressure or flow-overload in right coronary artery (RCA) angiotensin II type 1 (AT1) receptor-mediated endothelial dysfunction in swine models of aortic or pulmonary artery banding. METHODS AND RESULTS:: A total of 36 pigs (37 ±â€Š7 kg) were studied. The RCA ...
Zhao Zhe - - 2013
BACKGROUND: The purpose of this study is to develop and characterise a reproducible rabbit model of LVH regression following pressure-induced myocardial hypertrophy. MATERIALS AND METHODS: Without endotracheal intubation and mechanical ventilation, a median sternotomy was performed. The median incision was made exactly along the midline of the sternum. Ascending aortic ...
Pasta Salvatore - - 2013
OBJECTIVES: To assess the biomechanical implications of excessive stent protrusion into the aortic arch in relation to thoracic aortic stent graft (TASG) collapse by simulating the structural load and quantifying the fluid dynamics on the TASG wall protrusion extended into a model arch. METHODS: One-way coupled fluid-solid interaction analyses were ...
Quarles L Darryl LD University of Tennessee Health Science Center, 956 Court Ave., Suite B226, Memphis, Tennessee, USA. - - 2013
CLINICAL VIGNETTE: A 48-year-old man with chronic kidney disease stage five due to type II diabetes mellitus and hypertension was referred for hemodialysis initiation. His physical exam showed a blood pressure of 150/80, normal fundi, a positive fourth heart sound (S4), and trace pedal edema. Moderate aortic calcification was present ...
Kimura Masato - - 2013
Neurofibromatosis type 1 (NF1) is a relatively common autosomal dominant genetic disorder with a prevalence of 1 in 3,000 (0.03%) at birth. Clinical features are café-au-lait macules, intertriginous freckling, dermal neurofibroma, iris hamartoma (Lisch nodules), and learning disability. NF1 vasculopathy is a serious but underrecognized complication involving the cerebrovascular and ...
Ravakhah Keyvan - - 2013
Mild aortic regurgitation (AR) is a common finding in echocardiograms. Although some early reports suggested that hypertension predisposes to aortic root enlargement and AR, other pathological and echocardiographic studies have not shown such an association. The incidence and clinical importance of mild aortic insufficiency in hypertensive populations is unknown. This ...
Szasz Theodora - - 2013
Xanthine oxidase and its products, uric acid and ROS, have been implicated in the pathogenesis of cardiovascular disease, such as hypertension. We have previously reported that allopurinol inhibition of XO does not alter the progression of deoxycorticosterone acetate (DOCA)-salt hypertension in rats. However other researchers have observed a reduction in ...
Boon Chee-Meng - - 2013
Oleic acid has been shown to lower high blood pressure and provide cardiovascular protection. Curiosity arises as to whether super olein (SO), red palm olein (RPO) and palm olein (PO), which have high oleic acid content, are able to prevent the development of hypertension. Four-week-old male spontaneously hypertensive rats (SHR) ...
Idrissi Abdeslem El - - 2013
Taurine plays an important role in the modulation of cardiovascular function by acting not only within the brain but also within peripheral tissues. We found that IV injection of taurine to male rats caused hypotension and tachycardia. A single injection of taurine significantly lowered the systolic, diastolic, and mean arterial ...
Krivoshei Andrei - - 2013
The paper presents a non-invasive method and system for a long-term and continuous monitoring of the central aortic pressure (CAP) waveform and the augmentation index (AI). The CAP curve is estimated from the measured radial electrical bio-impedance (EBI) using spectral domain transfer functions (TF), which are established on the basis ...
Hanya Shizuo - - 2013
Lack of high-fidelity simultaneous measurements of pressure and flow velocity in the aorta has impeded the direct validation of the water-hammer formula for estimating regional aortic pulse wave velocity (AO-PWV1) and has restricted the study of the change of beat-to-beat AO-PWV1 under varying physiological conditions in man. Aortic pulse wave ...
Zapolski Tomasz - - 2013
Left atrial volume index (LAVI) has recently emerged as a useful biomarker for risk stratification and risk monitoring in many clinical settings. Many hemodynamic factors such as preload and afterload have an effect on evaluating left atrium function. This study was performed to investigate the relationship between LAVI and aortic ...
Paschalis Eleftherios I - - 2013
To present a novel design of an implantable glaucoma valve based on ferrofluidic nanoparticles and to compare it with a well-established FDA approved valve. Massachusetts Eye & Ear Infirmary, Boston, USA. A glaucoma valve was designed using soft lithography techniques utilizing a water-immiscible magnetic fluid (ferrofluid) as a pressure-sensitive barrier ...
Malaj Alban - - 2013
Background. Balloon aortoplasty with or without stenting is a less invasive alternative to open surgery for the management of recurrent isthmic coarctation. However, in patients with previous small size tube graft, an open surgical correction is mandatory and, in most cases, an anatomical aortic reconstruction is carried out. Methods. We ...
Zhou Wei-Jun - - 2013
β-blockers (BBs) with different pharmacological properties may have heterogeneous effects on sympathetic nervous activity (SNA) and central aortic pressure (CAP), which are independent cardiovascular factors for hypertension. Hence, we analyzed the effects of bisoprolol and atenolol on SNA and CAP in hypertensive patients. This was a prospective, randomized, controlled study ...
Pósa Anikó - - 2013
We investigated the gender differences in heme-oxygenase (HO) enzyme, which produces endogenous vascular protective carbon monoxide (CO). We studied (1) the activity and expression of HO enzymes in the left ventricle (LV) and aorta, (2) basal increase in basal blood pressure provoked by arginine vasopressine (AVP) in vivo, (3) the ...
Li Shuai - - 2013
Hypertension is a highly prevalent disorder and a major risk factor for cardiovascular diseases. Hypertensive vascular remodeling is the pathological mal-adaption of blood vessels to the hypertensive condition that contributes to further development of high blood pressure and end-organ damage. Hypertensive remodeling involves, at least in part, changes in protein ...
Mahfouz Ragab A RA Cardiology Department, Faculty of Medicine, Zagazig University, Egypt. - - 2013
We aimed to assess the relation of fractional pulse pressure (PPf) to aortic stiffness index and their impact on coronary fl ow reserve (CFR) and left ventricular diastolic function in asymptomatic diabetic patients. One hundred and thirty five consecutive asymptomatic diabetic patients (aged 48.8 ± 7.84 years), were included. CFR ...
Dyverfeldt Petter P Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California, USA. - - 2013
The authors sought to measure the turbulent kinetic energy (TKE) in the ascending aorta of patients with aortic stenosis and to assess its relationship to irreversible pressure loss. Irreversible pressure loss caused by energy dissipation in post-stenotic flow is an important determinant of the hemodynamic significance of aortic stenosis. The ...
Gölz Leonie L Department of Neurosurgery, Unfallkrankenhaus Berlin, Warener Straße 7, 12686, Berlin, - - 2013
Modern ventriculoperitoneal shunts (VPS) are programmable, which enables clinicians to adjust valve-pressure according to their patients' individual needs. The aim of this retrospective analysis is to evaluate indications for valve-pressure adjustments in idiopathic normal pressure hydrocephalus (iNPH). Patients operated between 2004 and 2011 diagnosed with iNPH were included. Kiefer-Scale was ...
Corno Antonio Francesco AF School of Medical Sciences, Health Campus, University Sains Malaysia , Kubang Kerian, Kelantan , - - 2013
Surgically induced, combined volume and pressure overload has been used in rabbits to create a simplified and reproducible model of acute left ventricular (LV) failure. New Zealand white male rabbits (n = 24, mean weight 3.1 ± 0.2 kg) were randomly assigned to either the Control group (n = 10) or to the Heart Failure group (HF, ...
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