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Results 351 - 400 of 1821
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Kim Yoon Tae - - 2012
Background: Each plantar pressure measurement system has a different accuracy and reliability, which is required to establish a range of normal values and determine the reliability.Objectives: To determine normal pressures with the Gaitview(®) system and assess its reliability.Study Design: Single-group repeated measures.Methods: Dynamic barefoot plantar pressure data were obtained in ...
Ufnal Marcin - - 2012
Hypertension is a chronic medical condition in which systemic arterial blood pressure is elevated. About 80-90% of diagnosed hypertension is considered essential (idiopathic), which means there is no obvious cause of the increase in blood pressure. My hypothesis states that part of idiopathic hypertension results from erroneous information that the ...
Pende Aldo - - 2012
Guidelines for the treatment of hypertension allow a wide range of choices to the physicians; however some differences are present about the preferred drugs to start treatment. The most important aim remains an adequate decrease of blood pressure, something not perfectly obtained in the general population, but some classes of ...
Hifumi Toru - - 2012
A 51-year-old man was brought to the emergency room because of a sudden onset of severe dysponea. On presentation, his blood pressure was 94/55&emsp14;mm&emsp14;Hg. Oxygen saturation was 86% while he was receiving 10&emsp14;l/min oxygen through a non-rebreather mask. On physical examination, no jugular venous distention was noted, but breath sounds ...
Stehlin Ellyce - - 2012
Hydrocephalus patients are commonly treated by insertion of ventriculoperitoneal shunts, but these have high complication rates. Monitoring of shunt and patient condition can be achieved through measuring intracranial pressure (ICP). Significant zero drift has limited previous developments towards a long-term implantable ICP monitor. We present a new implantable solid-state pressure ...
Mulgaonkar Amit P - - 2012
A prototype Low Intensity Focused Ultrasound (LIFU) stimulator system was developed to evaluate non-invasive neuromodulation in a large animal model. We conducted a feasibility study on a Göttingen minipig, demonstrating reversible, targeted transcranial neuromodulation. The hypothalamus of the minipig was repeatedly stimulated with LIFU which evoked temporally correlated increases in ...
Kamberi Lulzim Selim - - 2012
Data on the lowering effects of statins in hypertensive patients have been mixed and highly controversial. Some studies shows reductions effects of statins in blood pressure, whereas others do not. The evidence in the literature on the effects of statins on blood pressure raises the possibility that statins may directly ...
Kim Khae-Hawn - - 2012
The involuntary dual control systems of the autonomic nervous system (ANS) in the bladder of awake spontaneously hypertensive rats (SHRs) were investigated through simultaneous registrations of intravesical and intraabdominal pressures to observe detrusor overactivity (DO) objectively as a core symptom of an overactive bladder. SHRs (n = 6) showed the ...
Masutani Satoshi - - 2012
An infant with hypoplastic left heart syndrome showed paroxysmal episodes of bradycardia, hypotension, and hypoxemia upon crying after modified Norwood operation. Echocardiography showed decreased right ventricular ejection with grade III tricuspid regurgitation, a markedly enlarged aortic arch, and accelerated blood flow distal to the enlarged aorta. Aortography demonstrated an aneurysmal ...
Maceira Alicia M - - 2012
Systemic hypertension is a highly prevalent potentially modifiable cardiovascular risk factor. Imaging plays an important role in the diagnosis of underlying causes for hypertension, in assessing cardiovascular complications of hypertension, and in understanding the pathophysiology of the disease process. Cardiovascular magnetic resonance (CMR) provides accurate and reproducible measures of ventricular ...
Suzuki Shuji - - 2012
One of the purposes of treatment for dogs with mitral regurgitation (MR) is lowering left atrial pressure (LAP). There has been few study of the amlodipine in dogs with MR and amlodipine's effect on LAP has not been fully evaluated in a quantitative manner because of difficulties in directly measuring ...
Gage Gregory J - - 2012
The goal of fixation is to rapidly and uniformly preserve tissue in a life-like state. While placing tissue directly in fixative works well for small pieces of tissue, larger specimens like the intact brain pose a problem for immersion fixation because the fixative does not reach all regions of the ...
Bustamante Eliseo - - 2012
The rearing of poultry for meat production (broilers) is an agricultural food industry with high relevance to the economy and development of some countries. Periodic episodes of extreme climatic conditions during the summer season can cause high mortality among birds, resulting in economic losses. In this context, ventilation systems within ...
Yeh Jia-Rong - - 2012
Cardiovascular system is known to be nonlinear and nonstationary. Traditional linear assessments algorithms of arterial stiffness and systemic resistance of cardiac system accompany the problem of nonstationary or inconvenience in practical applications. In this pilot study, two new assessment methods were developed: the first is ensemble empirical mode decomposition based ...
Sato Junko - - 2012
In upper limb surgery, the pneumatic tourniquet is an essential tool to provide a clean, bloodless surgical field, improving visualization of anatomical structures and preventing iatrogenic failure. Optimal inflation pressure to accomplish these objects without injuring normal tissue and inducing complications is not yet established. Use of the minimum tourniquet ...
Scali Maria Chiara - - 2012
Cardiac and systemic hemodynamics have been historically in the domain of invasive cardiology, but recent advances in real-time 3-Dimensional echocardiography (RT3D echo) provide a reliable measurement of ventricular volumes, allowing to measure a set of hemodynamic parameters previously difficult or impossible to obtain with standard 2D echo. To assess the ...
Sauer Patrick - - 2012
High-pressure is a key feature of deep subsurface environments. High partial pressure of dissolved gasses plays an important role in microbial metabolism, because thermodynamic feasibility of many reactions depends on the concentration of reactants. For gases, this is controlled by their partial pressure, which can exceed 1 MPa at in situ ...
Anchala Raghupathy R Department of Public Health & Primary Care, University of Cambridge, Strangeways Research Laboratory, Wort's Causeway, Cambridge CB1 8RN, UK. - - 2012
Very few studies having decision support systems as an intervention report on patient outcomes for cardiovascular disease in the Western world. The potential role of decision support system for the management of blood pressure among Indian hypertensives remains unclear. We propose a cluster randomised trial that aims to test the ...
Nazaradeh Fridun F Proth-O-Type GmbH, Lindhorststr. 215, Bottrop, Germany. - - 2012
The human larynx is a versatile organ. Main functions are phonation, protection and regulation of the air ways. Patients suffer severely from the diagnosis of a laryngeal carcinoma of the stages T3 and T4. In most cases this diagnosis will lead to a total laryngectomy, which is usually dissatisfying in ...
Butlin Mark M Australian School of Advanced Medicine, Macquarie University, Sydney, NSW, Australia. - - 2012
There is increasing interest in non-invasive estimation of central aortic waveform parameters in the clinical setting. However, controversy has arisen around radial tonometric based systems due to the requirement of a trained operator or lack of ease of use, especially in the clinical environment. A recently developed device utilizes a ...
Cymberknop Leandro J LJ Buenos Aires Regional Faculty, National Technological University, Medrano 951, (C1179AAQ), Ciudad Autónoma de Buenos Aires, Argentina. - - 2012
Arterial stiffening is a common but highly variable disorder. Additionally, excessive arterial pulsatility is associated with various common diseases of aging and hypertension. Fractal dimension (FD) quantifies the time series complexity defined by its geometrical representation. Arterial pressure and diameter time series were evaluated in order to assess the relationship ...
Pavlin Marko - - 2012
This paper presents the design of a wireless pressure-monitoring system for harsh-environment applications. Two types of ceramic pressure sensors made with a low-temperature cofired ceramic (LTCC) were considered. The first type is a piezoresistive strain gauge pressure sensor. The second type is a capacitive pressure sensor, which is based on ...
Bugami Saad Al - - 2012
Many young patients with systemic hypertension have secondary causes which if identified early could lessen the cardiovascular complications associated with long standing hypertension. Coarctation of the aorta is one of those rare causes. We describe a 40 year old male with hypertension, coarctation of the aorta, bicuspid aortic valve, PDA ...
Wu Congqing - - 2011
The renin-angiotensin system is an essential regulatory system for blood pressure and fluid homeostasis. Angiotensinogen is the only known precursor of all the peptides generated in this system. While many of the basic understandings of angiotensinogen have come from research efforts to define its role in blood pressure regulation, novel ...
Gorshkova O P - - 2011
Segment-specific characteristics of the reactions of pial arteries of different generations to intravenous injection of norepinephrine were studied under conditions of instrumental stabilization of systemic blood pressure in rats with blocked α- and β-adrenoceptors.
Colletti Ashley A - - 2011
To determine the impact of mechanical heterogeneity on the distribution of regional flows and pressures in the injured lung, we developed an anatomic model of the canine lung comprised of an asymmetric branching airway network, which can be stored as binary tree data structure. The entire tree can be traversed ...
Chugo D - - 2011
For reducing the risk of pressure sore caused by long period sitting on a wheelchair, we develop a depressurization motion assistance system which is low cost and suitable for practical use. Our developing system consists of a seating cushion which the patient sits on and four air cells which can ...
Kaasi Andreas - - 2011
The 'biomimetic' approach to tissue engineering usually involves the use of a bioreactor mimicking physiological parameters whilst supplying nutrients to the developing tissue. Here we present a new heart valve bioreactor, having as its centrepiece a ventricular assist device (VAD), which exposes the cell-scaffold constructs to a wider array of ...
Pérez-Rosas N - - 2011
The renin-angiotensin system (RAS) is one of the most important systems in blood pressure homeostasis and pathogenesis of cardiovascular-renal diseases. When blood volume goes down, juxtaglomerular cells in the kidneys secrete renin. Renin stimulates the production of angiotensin I (Ang I), which is then converted to angiotensin II (Ang II). ...
Diao Ziji - - 2011
A novel therapeutic system for the treatment of hypertension was developed on the basis of a slow-breath training mechanism, using a microbreathing pressure sensor device for the detection of human respiratory signals attached to the abdomen. The system utilizes a single-chip AT89C51 microcomputer as a core processor, programmed by Microsoft ...
Sachdeva Ritu - - 2011
The purpose of the study is to determine the association of Doppler Tissue Imaging (DTI) and catheter-derived measures with rejection in pediatric heart transplant (PHT) recipients and to determine any correlation between DTI and catheter-derived measurements. Sixty echocardiograms were prospectively performed in 37 PHT recipients at the time of surveillance ...
House Chad M - - 2011
Pressure half-time is an inaccurate measure of mitral valve area in many clinical situations. The utility of the pressure half-time method to calculate mitral valve area after mitral valve repair is not well defined. Forty-two patients with a repaired mitral valve were identified. Mitral valve area was calculated by both ...
Dur Onur - - 2010
Conduits available for right ventricular outflow tract (RVOT) reconstruction eventually become stenotic and/or insufficient due to calcification. In order to reduce the incidence of reoperations we have developed and used a bicuspid valved polytetrafluoroethylene (PTFE) conduit for the RVOT reconstruction. The purpose of this study is to investigate the hemodynamic ...
Votta Emiliano - - 2010
Functional mitral regurgitation (FMR) is usually treated through annuloplasty, i.e., the restriction of the mitral annulus by implanting an undersized prosthetic ring. We conceived a steady-state fluid-dynamic mock simulator that allows for controlling the main mechanic determinants of FMR: transmitral pressure and papillary muscle (PM) apical and lateral dislocation. We ...
Latif S N SN Equine Department, Sports Medicine Section, Vetsuisse Faculty University of Zurich, Switzerland. - - 2010
To a large extent the success of a racehorse depends on effective and health preserving training methods. An important issue is the prevention of back pain. The influence of different types of training saddles (normal tree: S(A), treeless: S(B), flexible tree: S(C)) on the saddle pressure patterns in racehorses have ...
O'Connor Kim - - 2010
The aim of this study was to determine the impact of aortic stenosis (AS) on the different components of left atrial (LA) function. The study consisted of a total of 52 consecutive patients with severe AS (aortic valve area < 1 cm(2)) and 20 normal subjects matched for gender, heart ...
Seyıthanoglu Hakan - - 2010
Chronic calcified/ossified epidural hematoma is an uncommon complication of ventricular shunt surgery. There are only 4 cases related to valve-regulated shunt operations in the literature. It may be seen especially in young patients with chronic hydrocephalus, probably due to craniocerebral disproportion. The precise mechanism of the calcification or ossification of ...
Heuert U - - 2010
We describe the design and performance of a pressure-jump instrument for time-resolved NMR experiments. Initial pressure of up to 250 bars can be produced by means of a HPLC pump and distilled water as a pressure-transmitting liquid. Fast pressure release at a time resolution of 3 ms is achieved using ...
Gordeuk Victor R - - 2011
While in adults with sickle cell disease an elevation of tricuspid regurgitation velocity is associated with increased mortality, the importance of this finding in children has not been established. The role of intravascular hemolysis in the development of this complication is controversial. We conducted a prospective, longitudinal, multi-center study of ...
Bech-Hanssen Odd - - 2011
aortic valve replacement (AVR) in patients with aortic stenosis reduces the left ventricular (LV) pressure and the LV mass. However, residual LV hypertrophy at follow-up is a common finding with negative prognostic impact. In the present study, we investigate the contribution of the prosthesis (size, type, and gradients) and the ...
Min Sun-Yang - - 2010
We sought to demonstrate geometric changes in the tricuspid valve (TV) apparatus after tricuspid annuloplasty (TAP) and to identify predictors of residual tricuspid regurgitation (TR) in patients with functional TR using real-time three-dimensional echocardiography (RT3DE). RT3DE and two-dimensional colour Doppler echocardiography were performed in 59 consecutive patients before and 4.7 ...
Agarwal Manju - - 2010
A model for interactions between forestry biomass, wildlife population and industrialization pressure is proposed and analysed. Here, the functional responses are assumed to be ratio-dependent type. The effect of forestry biomass depletion in a forested habitat caused by industrialization pressure on the survival of the forestry biomass dependent wildlife species ...
Yamazawa Hirokuni - - 2010
The Doppler echocardiography derived peak instantaneous systolic pressure gradient (peak instantaneous Doppler PG), the mean PG (mean Doppler PG) and the aortic valvular area are the accepted standard for determining the prognosis and optimal timing of intervention because of good agreement between Doppler-derived and catheter-measured PGs in adult patients with ...
Tuzun Egemen - - 2011
As the use of left ventricular assist devices (LVADs) to treat end-stage heart failure has become more widespread, leaflet fusion-with resul-tant aortic regurgitation-has been observed more frequently. To quantitatively assess the effects of nonpulsatile flow on aortic valve function, we tested a continuous-flow LVAD in a mock circulatory system (MCS) ...
Sakamoto Yoshimasa - - 2010
BACKGROUND: The objective of this study was to reassess the validity of defining patient-prosthesis mismatch (PPM) in the aortic position on the basis of an indexed effective orifice area (iEOA) less than 0.85 cm(2)/m(2). METHODS: From June 1996 to March 2008, 342 patients underwent aortic valve replacement with a Carpentier-Edwards ...
Poglajen Gregor - - 2010
Functional mitral regurgitation (FMR) in patients with ischemic or nonischemic cardiomyopathy has been related to several overlapping factors. In vivo, these factors are very difficult to study independently of dynamic processes, such as ventricular wall motion or annular contraction. We developed an ex vivo left ventricular model that allows independent ...
Bahlmann Edda - - 2010
OBJECTIVES: The aim of this analysis was to assess the diagnostic importance of pressure recovery in evaluation of aortic stenosis (AS) severity. BACKGROUND: Although pressure recovery has previously been demonstrated to be particularly important in assessment of AS severity in groups of patients with moderate AS or small aortic roots, ...
Hirabayashi Go - - 2010
With spontaneous ventilation, sufficient exhaust resistance at the adjustable pressure-limiting (APL) valve when fully opened ensures that the reservoir bag fills and adequately supplies gas to patients. A lack of exhaust resistance with the APL valve fully open caused inadequate gas supply to patients with four types of anesthesia machines: ...
Perez-Diaz Jose-Luis - - 2010
A pure mechanical anisotropic model of a tree trunk has been developed based on the 3D finite element method. It simulates the microscopic structure of vessels in the trunk of a European beech (Fagus sylvatica) in order to study and analyse its mechanical behaviour with different configurations of pressures in ...
Roberge Raymond J - - 2010
OBJECTIVE: To assess the physiological impact of the N95 filtering facepiece respirator (FFR) on healthcare workers. METHODS: Ten healthcare workers each conducted multiple 1-hour treadmill walking sessions, at 1.7 miles/h, and at 2.5 miles/h, while wearing FFR with exhalation valve, FFR without exhalation valve, and without FFR (control session). We ...
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