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Zhao Yingzi Y University of Hong - - 2014
Experiments were performed to determine whether or not acute exposure to elevated pressure would disrupt endothelium-dependent dilatation by increasing local angiotensin II (ANGII) signaling. Vasomotor responses of mouse isolated carotid arteries were analyzed in a pressure myograph at a control transmural pressure (PTM) of 80mmHg. Acetylcholine-induced dilatation was reduced by ...
Stern Rebecca R From the Department of Medicine, Division of Cardiovascular Medicine, University of Wisconsin School of Medicine and Public Health, Madison (R.S., M.C.T., A.D.G., C.E.K., J.H.S.); Department of Epidemiology, University of Washington School of Public Health, Seattle (J.K.); and Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL (L.A.C., - - 2014
To identify sex differences in predictors of longitudinal changes in carotid arterial stiffness in a multiethnic cohort. Carotid artery distensibility coefficient (DC) and Young's elastic modulus (YEM) were measured in 2650 Multi-Ethnic Study of Atherosclerosis participants (45-84 years old and free of cardiovascular disease) at baseline and after a mean ...
Segers Patrick P aIBiTech-bioMMeda, Department of Electronics and Information Systems, iMinds Medical IT bDepartment of Flow, Heat and Combustion Mechanics, Ghent University, Gent, Belgium *Patrick Segers and Liesbeth Taelman contributed equally to the writing of this - - 2014
The reservoir-wave paradigm considers aortic pressure as the superposition of a 'reservoir pressure', directly related to changes in reservoir volume, and an 'excess' component ascribed to wave dynamics. The change in reservoir pressure is assumed to be proportional to the difference between aortic inflow and outflow (i.e. aortic volume changes), ...
Park Hyun Chul HC Department of Orthopedic Surgery, Woori General Hospital, 116-11 Songwoo, Soheul, Pocheon, Gyeonggi-do 487-820 Korea ; Graduate School, Kyung Hee University, Seoul, 130-701 - - 2014
Vascular clamps are often used during microvascular repair and anastomosis. However, pressure exerted by the clamps may damage the vessels, which compromises patency of vessels. This article reports on a microsurgical suture technique performed without any clamp to avoid clamp-related problems.
Ioannou Christos V CV 1 Vascular Surgery Unit, Department of Cardiothoracic and Vascular Surgery, University of Crete Medical School, Heraklion, Crete, - - 2014
Purpose : To investigate the observed inflow stenosis at the O-rings of the Ovation stent-graft and evaluate its hemodynamic and clinical impact. Methods : The study involved 49 consecutive patients (48 men; mean age 71.2±7.7 years) treated successfully with the Ovation abdominal aortic stent-graft between June 2011 and January 2014 ...
Esper Stephen A SA Department of Anesthesiology, University of Pittsburgh, Pittsburgh, PA, USA. Electronic address: - - 2014
The bedside measurement of continuous arterial pressure values from waveform analysis has been routinely available via indwelling arterial catheterization for >50 years. Invasive blood pressure monitoring has been utilized in critically ill patients, in both the operating room and critical care units, to facilitate rapid diagnoses of cardiovascular insufficiency and ...
Chin K Y KY Department of Medical Physics, University Hospitals of Leicester NHS Trust, Leicester Royal Infirmary , Leicester LE1 5WW , UK - - 2014
Abstract Arterial volume clamping uses external compression of an artery to provide continuous non-invasive measurement of arterial blood pressure. It has been assumed that mean arterial pressure (MAP) corresponds to the point where unloading leads to the maximum oscillation of the arterial wall as reflected by photoplethysmogram (PPG), an assumption ...
Mohammadi Hossein H Mechanical Engineering Department, McGill University, Montreal, QC, H3A 0C3, - - 2014
Aging and some pathologies such as arterial hypertension, diabetes, hyperglycemia, and hyperinsulinemia cause some geometrical and mechanical changes in the aortic valve microstructure which contribute to the development of aortic stenosis (AS). Because of the high rate of mortality and morbidity, assessing the impact and progression of this disease is ...
Gmitrov Juraj J National Institute of Public Health, Department of Environmental Health, Tokyo 108, Japan(1); Pro Vitae Hospital, Diabetology Clinic, Nemocnicna 33, Gelnica, 05601, Slovak Republic(2). Electronic address: - - 2014
Increasing evidence suggests nitric oxide (NO) deficit and baroreflex dysfunction to be characteristic for cardiovascular conditions even in preclinical stages of the disease. Sodium nitroprusside (SNP), a spontaneous NO-donor, vasodilatory effect was studied in conjunction with sinocarotid baroreceptor magnetic stimulation and potential implementation in NO deficiency states. Mean femoral artery ...
Monge García Manuel - - 2014
IntroductionFunctional assessment of arterial load by dynamic arterial elastance (Eadyn), defined as the ratio between pulse-pressure variation (PPV) and stroke volume variation (SVV), has recently been shown to predict the arterial pressure response to volume expansion (VE) in hypotensive preload-dependent patients. However, since both SVV and PPV were obtained from ...
Cörtük Mustafa M Adana Training and Research Hospital, Department of - - 2014
Obstructive sleep apnea syndrome (OSA) syndrome and aortic stiffness are associated with an increased risk of cardiovascular morbidity and mortality. Although aortic stiffness increased in patients with OSA, the relationship between severity of OSA indicated with apnea hypopnea index (AHI) and aortic stiffness was not investigated in previous studies. The ...
Zhang Y Y Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, - - 2014
Aortic blood pressure (BP) and 24-h ambulatory BP are both better associated with target organ damage than office brachial BP. However, it remains unclear whether a combination of these two techniques would be the optimal methodology to evaluate patients' BP in terms of left ventricular diastolic dysfunction (LVDD) prevention. In ...
Wang Y Y 1Department of Bioengineering & Surgery, University of Louisville, Louisville, KY, USA 2Department of Thoracic and Cardiovascular Surgery, University of Louisville, Louisville, KY, - - 2014
The risk for left ventricular (LV) suction during left ventricular assist devices (LVAD) support has been a clinical concern. Current development efforts suggest LVAD suction prevention and physiologic control algorithms may require chronic implantation of pressure and/or flow sensors, which can be unreliable due to baseline drift and short lifespan. ...
Krüger Tobias T Department of Thoracic, Cardiac and Vascular Surgery, University Hospital Tübingen, Tübingen, Germany - - 2014
To investigate the regional and directional compliance/distensibility of the healthy aorta. Complete fresh porcine aortas (n = 11) were perfused ex vivo under defined haemodynamic parameters using a custom-made pulse duplicator. Both circumferential and longitudinal compliance were measured optically. The pulse duplicator was able to perfuse the entire aorta with ...
Li Vivian Wing-Yi VW Division of Paediatric Cardiology, Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, The University of Hong Kong, Hong Kong, People's Republic of - - 2014
We assessed the left ventricular (LV) contractile reserve in young adults with repaired coarctation of the aorta and interrupted aortic arch by determination of LV force-frequency relation (FFR). Eighteen (7 men) patients aged 24.2 ± 5.4 years and 20 (9 men) healthy controls were studied. Blood pressures in the right arm ...
Heffernan Kevin S KS Department of Exercise Science, Syracuse University, Syracuse, New York, USA; - - 2014
The matching of vascular supply to neuronal metabolic demand during cognitive engagement is known as neurovascular coupling (NVC). Arterial stiffness is a prominent determinant of pulsatility in the systemic circulation and may thus indirectly impact NVC. In this pilot investigation, we explored changes in carotid artery stiffness and cerebrovascular hemodynamic ...
Elstad Maja M Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, PB 1103 Blindern, 0317, Oslo, Norway, - - 2014
Arterial blood pressure variations are an independent risk factor for end organ failure. Respiratory sinus arrhythmia (RSA) is a sign of a healthy cardiovascular system. However, whether RSA counteracts arterial blood pressure variations during the respiratory cycle remains controversial. We restricted normal RSA with non-invasive intermittent positive pressure ventilation (IPPV) ...
Chaston Daniel J DJ John Curtin School of Medical Research, Australian National University, Canberra, ACT, 0200, - - 2014
Mutant forms of connexin40 (Cx40) exist in the human population and predispose carriers to atrial fibrillation. Since endothelial expression of Cx40 is important for electrical and chemical communication within the arterial wall, carriers of mutant Cx40 proteins may be predisposed to peripheral arterial dysfunction and dysregulation of blood pressure. We ...
Amaral Lorena M LM From the Departments of Pharmacology (L.M.A., D.C.C., A.H., J.N.M., B.L.) and Obstetrics and Gynecology (J.N.M.), University of Mississippi Medical Center, - - 2014
Preeclampsia is characterized by increased uterine artery resistance index, chronic immune activation, and decreased circulating nitric oxide levels. 17-α-Hydroxyprogesterone caproate (17-OHPC) is a synthetic metabolite of progesterone used for the prevention of recurrent preterm birth. We hypothesized that 17-OHPC could reduce mean arterial pressure by decreasing inflammation, whereas improving vasodilation ...
Farahani Mehrdad H MH Department of Head and Neck Surgery, School of Medicine, University of California Los Angeles, 31-24 Rehab Center, 1000 Veteran Avenue, Los Angeles, California 90095 mhosnieh@ucla.edu, - - 2014
Recent studies reported the formation of intraglottal vortices for medium and high subglottal pressures in excised-larynx experiments, and hypothesized that the suction force created by these vortices might affect vocal fold vibration. However, high subglottal pressures often lead to large vocal fold elastic recoil forces, and it is unclear if ...
Peltokangas Mikko - - 2014
A wireless body sensor network for arterial pulse wave (PW) measurements is presented and tested with ten subjects. The system is capable of recording both mechanical PW contours with sensors made of a low-cost polypropylene-based material called electromechanical film (EMFi) and volume pulse signal with photoplethysmographic transducers. By using both ...
Sakamoto Takafumi T Kyushu university graduate school of medical sciences - - 2014
Baroreflex modulates both the ventricular and vascular properties, and stabilizes arterial pressure (AP). However, how changes in those mechanical properties quantitatively impact the dynamic AP regulation remains unknown. We developed a framework of circulatory equilibrium, in which both venous return and cardiac output are expressed as functions of left ventricular ...
Fairfax Seth T ST University of - - 2014
Investigations of human myogenic responses typically employ maneuvers that evoke robust changes in transmural pressure. Although this strategy has demonstrated peripheral myogenic responsiveness in the limbs, particularly in glabrous skin of the hand or foot, it has not considered the potential influence of the myogenic mechanism in beat-to-beat blood flow ...
Berguer R R Vascular Mechanics Laboratory, Frankel Cardiovascular Center, University of Michigan Health System, Ann Arbor, MI 48109. Electronic address: - - 2014
We reviewed the mechanics involved in the aneurysmal dilatation of the false lumen in Type B Aortic Dissection and the experimental and clinical evidence supporting the proposition that the main agent for this dilatation is a differential of pressure between the false and true lumena. This difference in pressure is ...
Thalhammer Christoph C Clinic for Angiology, University Hospital Zurich, - - 2014
Hemodynamic stability of patients during dialysis sessions is of pivotal importance in daily practice and accurate determination of dry weight (DW) remains a challenge. Little information is available about central venous and aortic pressure during dialysis. In this pilot study we used a new non-invasive technique to describe the changes ...
Millasseau Sandrine - - 2014
While for years clinicians have used cuff pressure to assess patients' cardiovascular risk, recent evidences has shown that aortic pressure, or more specifically aortic systolic and aortic pulse pressures, have a better prognostic value to predict cardiovascular events and mortality. This led to the emergence of multiple methods and devices ...
Loenneke Jeremy P JP Department of Health, Exercise Science, and Recreation Management, The University of Mississippi, P.O. Box 1848, Oxford, MS, 38677, USA, - - 2014
To determine what factors should be accounted for when setting the blood flow restriction (BFR) cuff pressure for the upper and lower body. One hundred and seventy one participants visited the laboratory for one testing session. Arm circumference, muscle (MTH) and fat (FTH) thickness were measured on the upper arm. ...
Oliveira Cristina - - 2014
One of the currently available treatments for aortic aneurysms is endovascular aneurysm repair (EVAR). However, in spite of major advances in the operating techniques, complications still occur and lifelong surveillance is recommended. In order to reduce and even eliminate the commonly used surveillance imaging exams, as well as to reduce ...
Bush Mark B MB School of Mechanical and Chemical Engineering, The University of Western Australia, M050, 35 Stirling Hwy, Crawley, WA, 6081, Australia, - - 2014
Existing theories for micturition in the female mandate total relaxation of the pelvic floor while detrusor pressure pushes the urethra open. However, video X-ray and electromyogram data indicate that micturition is preceded by active outwards opening of the outflow tract by backward-/downward-acting muscle vectors. If the detrusor pressure alone is ...
Broens Paul M A PM Department of Surgery, Anorectal Physiology Laboratory, University Medical Center Groningen, University of Groningen, Groningen, The - - 2014
The vaginal canal is an active and responsive canal. It has pressure variations along its length and shows reflex activity. At present, the prevailing idea is that the vaginal canal does not have a sphincter mechanism. It is hypothesized that an active vaginal muscular mechanism exists and might be involved ...
Mérillon Jean Paul JP Suresnes, France. Electronic address: - - 2014
Left ejection fraction (LVEF) - resulting from the difference between end-diastolic volume (EDV) and end-systolic volume (ESV), divided by EDV - is a poor index of left ventricular (LV) systolic performance due to its dependency on load conditions, inotropic state and LV remodelling. The characteristic impedance of the ascending aorta (Zc) integrates ...
Kuribayashi S S Department of Gastroenterology, Gunma University Hospital, Gunma, Japan; Department of Gastroenterology and Hepatology, National Hospital Organization Numata National Hospital, Gunma, - - 2014
Recently reported normal values for esophageal motility obtained by high-resolution manometry (HRM) using a system with a Unisensor catheter were significantly different from those obtained by the ManoScan(®) , which could result in a wrong diagnosis. To clarify whether these differences were due to system or subject differences, we compared ...
Donazzan Luca L Department of Cardiology, San Maurizio Regional Hospital, Bolzano, - - 2014
Systemic hypertension (HT) is a major long-term complication even after successful repair of aortic coarctation (CoA), and many factors are involved in this pathophysiology. To investigate the role of abnormalities in the aortic arch shape, central aortic flow dynamics, and distensibility in developing HT after successful repair of CoA. We ...
Lee Tae Hee TH Institute for Digestive Research, Digestive Disease Center, Soonchunhyang University College of Medicine, Seoul, Republic of Korea. - - 2014
At present, automated analysis of high-resolution manometry (HRM) provides details of upper esophageal sphincter (UES) relaxation parameters. The aim of this study was to assess the accuracy of automatic analysis of UES relaxation parameters. One hundred and fifty three subjects (78 males, mean age 68.6 years, range 26-97) underwent HRM. ...
Uçar Elalmış Ozgül O Department of Cardiology, Ankara Numune Training and Research Hospital, Ankara, - - 2014
The aim of this study was to investigate the elastic properties of the aorta, which are known to be predictors of cardiovascular morbidity and mortality in patients with systemic sclerosis (SSc). Forty patients (2 males, 38 females) with SSc who had been referred to echocardiography without any exclusion criteria were ...
Ji Fuhai F Department of Anesthesiology and Pain Medicine, University of California Davis Health System, 4150 V Street, Suite 1200, Sacramento, CA, 95817, - - 2014
Phenylephrine is often used to treat intra-operative hypotension. Previous studies have shown that the FloTrac cardiac monitor may overestimate cardiac output (CO) changes following phenylephrine administration. A new algorithm (4th generation) has been developed to improve performance in this setting. We performed a prospective observational study to assess the effects ...
Zhang Shu S Department of Nephrology, The First Affiliated Hospital of Nanjing Medical University , Nanjing , China - - 2014
Abstract Objective: To explore the relationship between ambulatory blood pressure and arterial atherosclerosis and provide simple and easy reference indicators for the prediction, prevention and prognosis of cardiovascular events in end-stage renal disease (ESRD) patients. Method: This prospective study consecutively collected clinical data of 114 ESRD hospitalized patients in the ...
Pan Youlian Y College of Life Science and Bio-Engineering, Beijing University of Technology, Beijing, 100124, - - 2014
This study was designed to investigate the effect of sinotubular junction and sinus diameters on aortic valve closure to prevent the regurgitation of blood from the aorta into the left ventricle during ventricular diastole. The 2-dimensional geometry of a base aortic valve was reconstructed using the geometric constraints and modeling ...
Goubergrits L L Biofluid Mechanics Laboratory, Charité - Universitätsmedizin Berlin, Augustenburger Platz 1, Berlin, 13353, Germany, - - 2014
Pressure drop associated with coarctation of the aorta (CoA) can be successfully treated surgically or by stent placement. However, a decreased life expectancy associated with altered aortic hemodynamics was found in long-term studies. Image-based computational fluid dynamics (CFD) is intended to support particular diagnoses, to help in choosing between treatment ...
Suarez Bagnasco D D Laboratorio de Acústica Ultrasonora, Instituto de Física, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay. Electronic address: - - 2014
Development of successful small-diameter vascular grafts constitutes a real challenge to biomaterial engineering. In most cases these grafts fail in-vivo due to the presence of a mechanical mismatch between the native vessel and the vascular graft. Biomechanical characterization of real native vessels provides significant information for synthetic graft development. Electrospun ...
Miller Nathaniel R NR Department of Obstetrics and Gynecology, Carl R. Darnall Army Medical Center, Ft. Hood, TX - - 2014
Abstract Objective: Investigate if micronized progesterone (P4) has the ability to attenuate thromboxane mimetic U46619-mediated fetoplacental artery vasoconstriction. Methods: Paired cotyledons obtained from the same placenta of five term subjects were analyzed. The fetal artery and maternal intervillous space of one cotyledon was infused with P4 while another cotyledon was ...
Sanchez-Gonzalez Marcos A MA Family Institute, Florida State University, Tallahassee, Florida, USA; Office of Clinical Research, Larkin Community Hospital, South Miami, Florida, - - 2014
Prior research suggests that negative affectivity (NA) may have a direct adverse effect on coronary circulation, whereas forgiveness may provide cardioprotection. This study examined whether NA and forgiveness were independently related to aortic hemodynamics and the subendocardial viability index (SVI), a marker of coronary perfusion. A sample of 131 adults ...
Bruce Beau B BB Departments of Ophthalmology and Neurology, Emory University, Atlanta, - - 2014
: Measurement of intracranial pressure (ICP) is critical for the evaluation and management of many neurological and neurosurgical conditions. The invasiveness of ICP measurement limits the frequency with which ICP can be evaluated, hampering the clinical care of patients with ICP disorders. Thus, there has been substantial interest in developing ...
Avery Robert A RA Departments of Neurology, Ophthalmology, Pediatrics, The Gilbert Family Neurofibromatosis Institute, Center for Neuroscience and Behavior (RAA), Children's National Health System, Washington, District of - - 2014
Understanding the reference range of cerebrospinal fluid opening pressure (CSFOP) in children is essential to the diagnosis of elevated intracranial pressure. Recent studies have highlighted several clinical elements that need to be considered when interpreting CSFOP measures. This review and recommendations are based on peer-reviewed literature, primarily from the past ...
Lee Sarah C M SC Department of Neurology (SCML, CJL), The Canberra Hospital, Canberra, Australia; Department of Neuroscience (SCML), Box Hill Hospital, Box Hill, Australia; and Australian National University Medical School (CJL), Canberra, - - 2014
Lumbar puncture (LP) is a widely-used investigative procedure. It allows relatively non-invasive measurement of intracranial pressure (ICP) which may have a significant impact on diagnosis and/or patient management. Over the years there has been considerable discussion about various aspects of the procedure, including what constitutes a normal opening pressure, what ...
Hazenfield Kurtis M KM Department of Small Animal Surgery, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO - - 2014
Objective-To compare in vitro security of 6 friction knots used as a first throw in the creation of a vascular ligation. Design-Experimental study. Sample-20 constructs of 6 friction knots created with 2-0 polyglyconate suture. Procedures-Security of the surgeon's throw, Miller's knot, Ashley modification of the Miller's knot, modified Miller's hand-tie, ...
Riesenkampff Eugénie E German Heart Institute Berlin, Unit of Cardiovascular Imaging, Department of Congenital Heart Disease and Pediatric Cardiology, Berlin, - - 2014
This study compared pressure fields by 4-dimensional (4D), velocity-encoded cine (VEC) cardiac magnetic resonance imaging (CMR) with pressures measured by the clinical gold standard catheterization. Thirteen patients (n = 7 male, n = 6 female) with coarctation were studied. The 4D-VEC-CMR pressure fields were computed by solving the Pressure-Poisson equation. The agreement ...
Pecha Simon S Department of Cardiovascular Surgery, University Heart Center, University Hospital Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany, - - 2014
Vascular reflex mechanisms contribute to vasovagal syncope. However, the alterations in central haemodynamics in patients with vasovagal syncope are unknown. 30 consecutive patients (36.5 ± 15 years, 14 females) with recurrent vasovagal syncope (VVS) and a positive tilt table test were compared to 39 age- and sex-matched controls (36.9 ± 16 years, 15 females) with a ...
Pereira Tânia T Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal. Electronic address: - - 2014
The pulse pressure waveform has, for long, been known as a fundamental biomedical signal and its analysis is recognized as a non-invasive, simple, and resourceful technique for the assessment of arterial vessels condition observed in several diseases. In the current paper, waveforms from non-invasive optical probe that measures carotid artery ...
Schmidt Frank F 2 Medical Clinic, Cardiology, University Medical Center Mainz, Johannes Gutenberg University, Langenbeckstrasse 1, 55131, Mainz, - - 2014
Epidemiological studies suggest the existence of a relationship between aircraft noise exposure and increased risk for myocardial infarction and stroke. Patients with established coronary artery disease and endothelial dysfunction are known to have more future cardiovascular events. We therefore tested the effects of nocturnal aircraft noise on endothelial function in ...
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