Search Results
Results 351 - 400 of 1712
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Dwyer Harry A - - 2009
OBJECTIVES: Studied under clinical trials, transcatheter aortic valves (TAV) have demonstrated good short-term feasibility and results in high-risk surgical patients with severe aortic stenosis. However, their long-term safety and durability are unknown. The objective of this study is to evaluate hemodynamic changes within TAV created by bioprosthetic leaflet degeneration. METHODS: ...
Masson Ingrid - - 2009
A new protocol for cryopreservation of arteries frozen at -80 degrees C was compared to the reference protocol for cryopreservation at -150 degrees C and to freshly harvested arteries. The aim of the study is to evaluate both protocols as global procedures to freeze and thaw arteries commonly used in ...
Fahey Michael - - 2009
BACKGROUND: Many methods are used to measure arterial elasticity in children using echocardiography. There is no data to support the equivalence of the different techniques. The goal of this study was to evaluate the reproducibility of several techniques used to measure arterial elasticity using echocardiography. METHODS: Aortic distension in two ...
Watton Paul N - - 2009
We compare two constitutive models proposed to model the elastinous constituents of an artery. Holzapfel and Weizsäcker [1998. Biomechanical behavior of the arterial wall and its numerical characterization. Comput. Biol. Med. 28, 377-392] attribute a neo-Hookean response, i.e. Psi=c(I(1)-3)), to the elastin whilst Zulliger et al. [2004a. A strain energy ...
Hodis S - - 2009
Change in arterial stiffness is generally considered a risk factor for cardiovascular disease and, in various ways, has been associated with hypertension, diabetes, hyperlipidemia, atherosclerosis, and heart failure, likely because of altered dynamics of the wall and of the fluid-wall interplay in pulsatile flow. We present a comprehensive analytical study ...
Bia Daniel - - 2009
Native vessels-grafts biomechanical mismatch (BM) is related to graft failure. The BM could be reduced using human cryopreserved/defrosted arteries (cryografts), but post-thaw cryografts' recovery could be associated with an impaired biomechanical behavior. In vitro, we demonstrated that our cryopreservation methods do not affect arteries' biomechanics, but only post-implant studies would ...
Aoki Tomohiro - - 2009
Cerebral aneurysm (CA) is a relatively common disease and can cause a catastrophic subarachnoid hemorrhage with a high mortality and morbidity rate. Despite its clinical and social importance, the detailed mechanism of CA formation remains to be elucidated, resulting in the absence of effective medical treatment against CAs. Recent studies ...
Lindeman Jan H N - - 2009
BACKGROUND: Doxycycline has been shown to effectively inhibit aneurysm formation in animal models of abdominal aortic aneurysm. Although this effect is ascribed to matrix metalloproteinase-9 inhibition, such an effect is unclear in human studies. We reevaluated the effect of doxycycline on aortic wall protease content in a clinical trial and ...
Campos Luciene Cristina Gastalho - - 2009
AIMS: Cysteine- and glycine-rich protein 3/muscle LIM-domain protein (CRP3/MLP) mediates protein-protein interaction with actin filaments in the heart and is involved in muscle differentiation and vascular remodelling. Here, we assessed the induction of CRP3/MLP expression during arterialization in human and rat veins. METHODS AND RESULTS: Vascular CRP3/MLP expression was mainly ...
Seidlerova, Jitka
In line with Guyton’s work, the goal of our research was to explore in three European populations whether the properties of large arteries are associated with renal sodium handling, which itself changes with environmental factors and with variation in a large number of genes. Before engaging in the genetic analyses ...
Wang Zhong-He - - 2009
OBJECTIVE: In this experimental study with rabbits, the influence of intraarterial high-dose cisplatin with concomitant irradiation on arterial microanastomoses was evaluated to determine their impact on free-tissue transfers. METHODS: The right and left iliac arteries of 10 rabbits were injected with 150 mg/m of cisplatin (group 1). To serve as ...
Chiu Ing-Sh - - 2009
BACKGROUND: Reoperation is usually inevitable for congenital cardiac patients after insertion of an extracardiac valved conduit. We sought to verify that a transannular patch on the autologous posterior wall with the common wall between the aorta and pulmonary artery can replace the conventional operation using an extracardiac conduit. METHODS: From ...
Toprak Ahmet - - 2009
Differences in geometric adaptation of the left ventricle and associated cardiovascular risk may reflect the differential effects of classic risk factors and arterial stiffness on the left ventricle. In the present study, the influence of cardiovascular risk factors and arterial stiffness indexes on left ventricular (LV) geometry types were studied ...
Mueed Irem - - 2009
To evaluate the potential impact of using atherosclerotic radial artery (RA) conduits as grafts in coronary artery bypass surgery, we examined the vasoconstrictor and electrophysiological properties of mildly and severely atherosclerotic RAs. Vasoconstrictor responses were measured in cannulated and pressurized (85mmHg) RA segments and K(+) currents were measured in single ...
Hitchcock Kathryn E - - 2009
Optimal ultrasound parameters to enhance delivery of therapeutic-loaded echogenic immunoliposomes (ELIP) into the arterial wall are being developed for the treatment of atherosclerosis. The aim of this work was to determine whether anti-ICAM-targeted, rhodamine-labeled ELIP (Rh-ELIP) would adhere to and penetrate the vascular endothelium in atheromatous murine arterial segments with ...
Gkaliagkousi E - - 2009
The elasticity of a given arterial segment of the aorta and of big elastic arteries is not constant but depends on its distending pressure. As distending pressure increases, there is greater recruitment of inelastic collagen fibers and thereby a reduction in elasticity. It also depends on structural changes in the ...
Jaffe Ronen R Schulich Heart Programme, Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Ontario, - - 2009
We sought to perform the first systematic study of the natural history of chronic total arterial occlusions (CTOs) in an experimental model. Angioplasty of CTOs has low success rates. The structural and perfusion changes during CTO maturation, which may adversely affect angioplasty outcome, have not been systematically studied. Occlusions were ...
Jelski Wojciech - - 2009
OBJECTIVE: Human blood vessels contain a huge amount of alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH), which play a significant role in the metabolism of many biological substances and participate in various metabolic pathways. The aim of this study was the investigation of the differences between the activities of ADH ...
Hamed Sherifa A - - 2010
PURPOSE: The objective of this study is to provide evidence that primary hyperuricemia is associated with cochlear dysfunction as other metabolic diseases that interfere with cell metabolism. MATERIALS AND METHODS: Cochlear function was evaluated in 25 subjects with asymptomatic hyperuricemia using routine diagnostic audiometry along with transient evoked and distortion ...
Schock A - - 2009
Vasculitis affecting the meningeal elastic arteries was identified in six sheep of various breeds during routine diagnostic investigation. The lesions consisted of multifocal intimal proliferation, thickening of the tunica media, multifocal infiltration of the media by inflammatory cells and more extensive perivascular accumulation of lymphocytes and plasma cells within the ...
Callaghan F M - - 2009
Spontaneous dissection of the cervical internal carotid artery (sICAD) is a major cause of stroke in young adults. A tear in the inner part of the vessel wall triggers sICAD as it allows the blood to enter the wall and develop a transmural hematoma. The etiology of the tear is ...
Henry R M A - - 2009
The metabolic syndrome (MetS) increases cardiovascular disease (CVD) risk. How MetS increases CVD risk is incompletely understood, but increasing arterial stiffness is one candidate link, which in turn could be explained by (low-grade) inflammation, endothelial dysfunction (ED) or insulin resistance (IR). However, MetS-related increases in stiffness may not be uniformly ...
Hirohata S - - 2009
OBJECTIVE:Vascular involvement (vasculo-Beh??et's disease) is relatively common in Beh??et's disease. Although pulmonary artery aneurysm (PAA) is rare, it is the most serious and sometimes fatal complication. However, the mechanism of the development of PAA is unclear. In the present study, we carried out immunohistological examination of the ruptured pulmonary aneurysm ...
Vlachopoulos Charalambos - - 2009
OBJECTIVE: To investigate the effect of laughter and mental stress on arterial stiffness and central hemodynamics. Arterial stiffness and wave reflections are independent predictors of cardiovascular risk. Chronic psychological stress is an independent risk factor for cardiovascular events, whereas acute stress deteriorates vascular function. METHODS: Eighteen healthy individuals were studied ...
Katsanos Konstantinos - - 2009
Compared with angiogenesis, arteriogenesis is a distinct process based on the remodeling and maturation of pre-existing arterioles into large conductance arteries. Therapeutic angiogenesis has been proposed as a potential treatment for ischemic atherosclerotic diseases. Since a variety of angiogenic factors have been tested with inconsistent so far clinical results, the ...
Pyle Amy L - - 2010
BACKGROUND: The arterial vasculature is subjected to considerably greater biomechanical stress than the venous circulation. This is reflected in the difference in morphology between large arteries and veins, however little is known about the molecular differences that arise as a consequence of biomechanical stress. Previously, we identified a group of ...
Troidl Christian - - 2009
The development of a collateral circulation (arteriogenesis), bypassing an arterial occlusion, is important for tissue survival, but it remains functionally defective. Micro array data of growing collateral vessels, exposed to chronically elevated fluid shear stress (FSS), showed increased transcription of the transient receptor potential cation channel, subfamily V, member 4 ...
Gul Umit - - 2009
We report a case of simultaneous injury of right external iliac artery and vein by a needle carrier that was inserted from the suprapubic area down to the vaginal lumen during anterior vaginal wall sling procedure. The risk factors and measures to be taken to avoid this life threatening complication ...
Chung William B - - 2009
Under physiological conditions, arteries remodel in response to changes in blood flow to maintain local shear stress. Risk factors and developing atherosclerosis may be associated with maladaptive remodeling that produces relatively large arteries with low levels of shear stress. Recent studies have shown that the brachial artery and other peripheral ...
Matsumoto Shinsuke - - 2010
BACKGROUND: The objective of the present study was to investigate the effects of granulocyte colony-stimulating factor (G-CSF) on right ventricular hypertrophy following extensive pulmonary resection in rats. MATERIALS AND METHODS: Adult rats were divided into four groups: (1) Group S (right thoracotomy only); (2) Group L (right three lobectomy); (3) ...
van Es A C G M - - 2009
BACKGROUND/AIMS: Vascular pathology is increasingly seen as a factor contributing to the development of Alzheimer's disease (AD). With this in mind we hypothesized that this vascular pathology could be directly detected in the arteries contributing to the cerebral circulation of mild cognitive impairment (MCI) and AD patients by means of ...
Chang Enting - - 2009
Septic pulmonary embolism is an uncommon disease in which septic thrombi are mobilised from an infectious nidus and transported in the vascular system of the lungs. It is usually associated with tricuspid valve vegetation, septic thrombophlebitis or infected venous catheters. We report an immunocompetent young man who presented with fever ...
Scanavine Adriana Bernardini Antunes - - 2009
Anatomical variations of the sphenopalatine foramen may correspond to alterations at the arterial nasal irrigation input, which is a relevant condition to treat severe epistaxis through ligation of the sphenopalatine artery. AIM: To study the sphenopalatine foramen in terms of its numeric variation and its location on the lateral nasal ...
Bernal Miguel - - 2009
Arterial elasticity has become a topic of importance in the past decades, as it has shown that it can be used to predict cardiovascular diseases and mortality. Several in vivo and ex vivo techniques have been developed to characterize the mechanical properties of vessels. In vivo techniques tend to ignore ...
Yamagishi Toshio - - 2009
AIM: We investigated the relationship between coronary risk factors and the intima-media thickness (IMT) and wall elasticity of carotid arteries. A new real-time ultrasonic measurement system that allows measurement of the elasticity of the carotid arterial intima-media complex was applied to 350 subjects, who were also checked for the presence/absence ...
Janzen Annette - - 2009
We present a 31-year-old female who was admitted to our neurology department for vertigo, partial left-sided hemihypesthesia and nuchal headache of subacute onset. Colour-duplex ultrasound disclosed bilateral low flow with a high resistance flow pattern in both vertebral arteries in the V2 segments, while the basilar artery had normal flow. ...
Rane Neil - - 2009
In this report a central cause of isolated vertigo in a 24-year-old woman is presented: brainstem infarct secondary to vertebral artery dissection.
Tracy Richard E - - 2009
Normal, youthful arteries generally maintain constant radius/wall thickness ratios, with the relationship being described by the Laplace Law. Whether this relationship is maintained during aging is unclear. This study first examines the Laplace relationships in postmortem coronary arteries using a novel method to correct measurements for postmortem artifacts, uses data ...
Ali Khalid - - 2009
Antihypertensive agents can reduce arterial stiffness. We hypothesized that an angiotensin receptor blocker (ARB) irbesartan and an angiotensin converting enzyme inhibitor (ACEI) lisinopril improved arterial compliance. A randomized, double-blind, double-dummy, controlled crossover trial. Fifteen hypertensive patients, mean age 65.5 +/- 8.9 years (mean +/- SD) were given irbesartan (150 to ...
Duprez Daniel A DA Cardiovascular Division, Medical School University of Minnesota, Minneapolis, MN 55455, USA. - - 2009
Reduction in arterial elasticity marks progression toward cardiovascular morbidity and mortality. Variability in arterial elasticity may help account for race/ethnic and gender differences in cardiovascular risk. Cross-sectional study. Whites, African Americans, Hispanics and Chinese aged 45-84 years free of clinically recognized cardiovascular disease were recruited in six US communities. We ...
Humphrey J D - - 2009
Arteries exhibit a remarkable ability to adapt to diverse genetic defects and sustained alterations in mechanical loading. For example, changes in blood flow induced wall shear stress tend to control arterial caliber and changes in blood pressure induced circumferential wall stress tend to control wall thickness. We submit, however, that ...
Jeltsch Martin - - 2009
Purpose of this study was the evaluation of the thoracic aortic wall thickness as a potential identifier of patients at increased risk for future cardiac events. Thoracic aortic wall thickness was measured with MDCT in 160 patients. The CT-scans were implemented as non-invasive coronary angiography studies. Relationships between aortic wall ...
Wiernicki I - - 2008
BACKGROUND: The natural history of abdominal aortic aneurysm (AAA) is wall remodelling potentially leading to a final rupture. The pathogenesis of AAA appears to be multifactorial. The aim of this pilot prospective study was to assess the relationship between the thickness of the thrombus within the abdominal aortic aneurysm, intramural ...
Caro C G - - 2009
The suggestion was made in the 1870s that mechanical irritation of the arterial wall is a cause of atherosclerosis, because the changes were chiefly found at points "exposed to the full stress and impact of the blood." The mechanical damage theory persisted until well into the 20th century when, with ...
Cheng Chao-Hung - - 2009
AIMS: Glucose transporter 10 (GLUT10), encoded by the SLC2A10 gene, is a member of the class III facilitative glucose transporter family. Mutations in the SLC2A10 gene cause arterial tortuosity syndrome (ATS) in humans. To further study the pathogenesis of the disease, we generated mice carrying GLUT10 mutations. METHODS AND RESULTS: ...
Thijssen Dick H J - - 2009
Flow-mediated dilatation (FMD) has become a commonly applied approach for the assessment of vascular function and health in humans. Recent studies emphasize the importance of normalizing the magnitude of FMD to its apparent eliciting stimulus, the postdeflation arterial shear. However, the relationship between shear stress and the magnitude of FMD ...
Gundiah Namrata - - 2009
Uniaxial mechanical experiments have shown that a neo-Hookean/Gaussian model is suitable to describe the mechanics of arterial elastin networks [Gundiah, N., Ratcliffe, M.B., Pruitt, L.A., 2007. Determination of strain energy function for arterial elastin: Experiments using histology and mechanical tests. J. Biomech. 40, 586-594]. Based on the three-dimensional elastin architecture ...
Renner-Martin T F P - - 2009
Although donkeys play an important role as companion or pack and draught animals, theriogenological studies and anatomical data on the genital organs of the jenny are sparse. To provide anatomical descriptions and morphometric data, the organa genitalia feminina, their arteries and the ligamentum latum uteri of 10 adult but maiden ...
Macedo Robson - - 2008
To evaluate the use of coronary wall MRI as a measure of atherosclerotic disease burden in an asymptomatic population free of clinical cardiovascular disease. Coronary wall magnetic resonance imaging (MRI) is a noninvasive method for evaluation of arterial wall remodeling associated with atherosclerosis. Asymptomatic participants of the Multi-Ethnic Study of ...
Kouhi E - - 2008
A three-dimensional (3D) computational model of stenotic coronary artery bypass grafting (CABG) system with fluid-structure interaction (FSI) using realistic physiological conditions is introduced. Unsteady pulsatile blood flow is applied to the wall of non-linear deformable arteries over the systolic period. In the analysis, the arbitrarily Lagrangian-Eulerian (ALE) formulation is used ...
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