Search Results
Results 501 - 550 of 2509
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Fowlie Jennifer - - 2011
OBJECTIVE: To evaluate the magnitude and distribution of joint contact pressure on the medial tibial condyle after grade III cranial horn tears of the medial meniscus. STUDY DESIGN: Experimental study. ANIMALS: Cadaveric equine stifles (n = 6). METHODS: Cadaveric stifles were mounted in a materials testing system and electronic pressure ...
Clement Katherine C - - 2011
PURPOSE: Neurally adjusted ventilatory assist (NAVA) is a mode of ventilation designed to improve patient-ventilator interaction by interpreting a neural signal from the diaphragm to trigger a supported breath. We hypothesized that neurally triggered breaths would reduce trigger delay, ventilator response times, and work of breathing in pediatric patients with ...
Paraguassu W - - 2011
RbNd(WO(4))(2) was investigated by high pressure Raman spectroscopy in the 0.1-12.3 GPa pressure interval. The assignment of modes was made based on lattice dynamics calculations and the results of these calculations helped us to also discuss the high pressure behavior of phonon spectra in this material. Our results show that a ...
Turhan Tuncer - - 2011
INTRODUCTION: The most important limitations to endoscopic procedures in the ventricular system of the brain are due to the constraint of working inside a fluid. The evacuation of cerebrospinal fluid (CSF) from the ventricles is performed often in microsurgical interventions using a surgical microscope. This study aimed at studying the ...
Matsui Yoshio - - 2011
OBJECTIVES: To clarify the implications of the home arterial stiffness index (HASI), we compared HASI with other arterial stiffness measures and investigated the association between HASI and hypertensive target organ damage (TOD). METHODS: We assessed brachial-ankle pulse wave velocity (baPWV) and the carotid augmentation index (cAIx) as measures of arterial ...
Faez Telli - - 2011
In this paper, the influence of a dynamic variation in the ambient pressure on the subharmonic response of phospholipid-coated microbubbles was investigated. The ambient pressure in water was modulated by a 2.5 kHz acoustic wave with a peak amplitude of 15 kPa. We investigated the fundamental and subharmonic emissions at ...
Takeyama Masaharu - - 2011
OBJECTIVE: The pleth variability index (PVI), which is calculated from respiratory variations in the perfusion index (PI), reportedly predicts fluid responsiveness. However, vasomotor tone fluctuations induced by nociceptive stimuli change the PI and may reduce the accuracy of PVI. The aim of this study was to confirm the effects of ...
Sun Dan Dan - - 2011
We aimed to establish a canine model of acute thromboembolic pulmonary hypertension (ATEPH) and to explore the feasibility of diagnosing pulmonary hypertension (PH) through the Doppler flow spectra of the superior vena cava (SVC). A canine model of ATEPH was developed by infusing thrombus into the right femoral vein. The ...
Hawkins Richard N - - 2011
Abstract The aim of the present study was to determine whether changing stance width would result in a corresponding change in postural and/or pistol stability. Twelve national-standard male air pistol shooters performed 10 shots each at five stance widths (30?cm, 45?cm, 60?cm, 75?cm, and 90?cm). Postural stability was determined by ...
Richter Hans Peter - - 2011
OBJECTIVE: Acute right ventricular failure (RVF) is a life-threatening condition. This study investigated whether the combination of central venous pressure (CVP) and left ventricular functional preload parameters, such as stroke volume variation (SVV) and pulse pressure variation (PPV), can be used for the detection of acute RVF and for guidance ...
Kim Eun Ran - - 2011
Background and Aim: DA 9701, a novel prokinetic agent formulated with Pharbitis Semen and Corydalis Tuber, has strong prokinetic effects and enhances gastric compliance in conscious dogs. In this study, the effects of DA 9701 on gastric accommodation were studied in conscious dogs. Methods: Beagle dogs with an implanted gastric ...
Lee Jong-Hwan - - 2011
OBJECTIVE: The aim of this study was to evaluate the ability of pulse-pressure variation to predict fluid responsiveness during heart displacement for off-pump coronary artery bypass surgery using receiver operating characteristic analysis. DESIGN: A prospective study. SETTING: A clinical study in a single cardiac anesthesia institution. PARTICIPANTS: Thirty-five patients undergoing ...
Han Hui - - 2011
High pressure measurements in most scientific fields rely on metal vessels given the superior tensile strength of metals. We introduce high pressure magnetic resonance imaging (MRI) measurements with metallic vessels. The developed MRI compatible metallic pressure vessel concept is very general in application. Macroscopic physical systems are now amenable to ...
Zhao Zhisheng - - 2011
The high-pressure phase transitions of B1-structured stoichiometric transition metal carbides (TMCs, TM = Ti, Zr, Hf, V, Nb, and Ta) were systematically investigated using ab initio calculations. These carbides underwent universal phase transitions along two novel phase-transition routes, namely, B1 → distorted TlI (TlI') → TlI and/or B1 → distorted ...
Asgari Shadnaz S Neural Systems and Dynamics Laboratory, Department of Neurosurgery, David Geffen School of Medicine, University of California, Los Angeles, - - 2011
Lactate/pyruvate ratio (LPR) from microdialysis is a well-established marker of cerebral metabolic crisis. For brain injury patients, abnormally high LPR could indicate cerebral ischemia or failure of O(2) uptake. However, there is a debate on the primary factor responsible for LPR increase. Exploiting the potential of using the morphology of ...
Foster Gary P - - 2011
Ischemic pre-condition of an extremity (IPC) induces effects on local and remote tissues that are protective against ischemic injury. To test the effects of IPC on the normal hypoxic increase in pulmonary pressures and exercise performance, 8 amateur cyclists were evaluated under normoxia and hypoxia (13% F(I)O(2)) in a randomized ...
Colloby Sean J SJ Institute for Ageing and Health, Newcastle University, Newcastle upon Tyne, - - 2011
Structural brain abnormalities are associated with late-life major depression, with numerous studies reporting increased white matter hyperintensities (WMH) and reduced cortical/subcortical grey matter volumes. There is strong evidence linking vascular disease to WMH, but limited evidence on its association with subcortical volumes. To investigate the relationship of orthostatic blood pressure ...
Madsen P T - - 2012
Delphinids produce tonal whistles shaped by vocal learning for acoustic communication. Unlike terrestrial mammals, delphinid sound production is driven by pressurized air within a complex nasal system. It is unclear how fundamental whistle contours can be maintained across a large range of hydrostatic pressures and air sac volumes. Two opposing ...
Lee Chih-Hsin - - 2011
BACKGROUND:: Pulse pressure variation (PPV) is a promising predictor for volume responsiveness. However, recent studies have criticized its validity during small tidal volume ventilation. The present study evaluated the influence of pressure control level (PCL) on PPV. METHODS:: Six anesthetized healthy piglets simulating hemorrhagic shock underwent 5 stages of intravascular ...
Lewinsohn A - - 2011
IntroductionThe 2010 International Liaison Committee on Resuscitation gave a detailed update on best practice for cardiopulmonary resuscitation (CPR) with a discussion on appropriate patient and CPR provider position, based largely on expert opinion. The objective of this study was to ascertain robust evidence on the effect of bed height and ...
Vardoulis O - - 2011
Vascular prostheses currently used in vascular surgery do not have the same mechanical properties as human arteries. This computational study analyses the mechanisms by which grafts, placed in the ascending aorta (proximal) and descending aorta (distal), affect arterial blood pressure. A one-dimensional cardiovascular model was developed and adapted to include ...
Csókay András - - 2011
To demonstrate the efficacy of a vascular protection technique during decompressive craniectomy (DC) which can reduce the risk of secondary venous infarction due to the blocking pressure for venous outflow through bridging veins. The observation was carried out In vitro (cadaver) and in vivo (surgery and magnetic resonance imaging) in ...
Palomba Daniela - - 2011
The study was aimed at examining the effect of a short Heart Rate-Biofeedback (HR-BF) protocol on systolic (SBP) and diastolic (DBP) blood pressure levels and BP emotional reactivity. Twenty-four unmedicated outpatients with pre- and stage 1 hypertension, were randomly assigned to active treatment (BF-Training) or control (BP-Monitoring) group. Subjects in ...
Raveh Y - - 2011
The rapid uniform delivery of University of Wisconsin solution (UW) to the microcirculation may be compromised by its vasoactivity. In 2 different rodent models, we tested whether UW-mediated vasoconstriction could be reversed with nicardipine. In the perfused, splanchnic circulation, intravascular control solutions (lactated Ringers [LR], Hextend [HEX], histidine-tryptophan-ketoglutarate [HTK]) or ...
Ribeiro Ana Paula - - 2011
The intention of this investigation was to longitudinally describe and compare the plantar pressure distribution in orthostatic posture and gait throughout pregnancy. A prospective longitudinal observational study was conducted with six pregnant women (mean ± SD age, 32 ± 3 years) with a mean ± SD weight gain of 10.0 ...
Dratva Julia - - 2012
There is some evidence for an association between traffic noise and ischemic heart disease; however, associations with blood pressure have been inconsistent, and little is known about health effects of railway noise. We aimed to investigate the effects of railway and traffic noise exposure on blood pressure; a secondary aim ...
Köhler Daniel - - 2011
: Pelvic ring injuries can be associated with severe blood loss and hemodynamic instability. The increase in pelvic volume in disrupted pelvic ring injuries is thought to cause accumulation of large volumes of blood in the retroperitoneal cavity. Extra abdominal compression for reduction of the pelvic ring may affect intrapelvic ...
Higgins Niamh M - - 2011
Abstract Experimental studies show that training people to attend to negative stimuli makes them more likely to respond with greater anxiety to stress. The present study investigated this effect in students using measures of cardiovascular responses to stress and examined whether individual differences influence the impact of attention training on ...
Sipkens Laura M - - 2011
OBJECTIVE: Evaluation of autonomic function responses is increasingly important for risk prediction and hemodynamic evaluation in the ambulant and perioperative setting, but requires a noninvasive arterial blood pressure measurement device. This study describes whether a novel noninvasive beat-to-beat arterial blood pressure measurement device (Nexfin HD) is able to reproducibly reflect ...
Mesas Arthur Eumann - - 2011
BACKGROUND: The effect of coffee and caffeine on blood pressure (BP) and cardiovascular disease (CVD) in hypertensive persons is uncertain. OBJECTIVE: The objective was to summarize the evidence on the acute and longer-term effects of caffeine and coffee intake on BP and on the association between habitual coffee consumption and ...
Ebare M N - - 2011
OBJECTIVE: To assess the level of noise generated by music shops in an urban city in Nigeria. STUDY DESIGN: Cross-sectional, descriptive study. METHODOLOGY: The study involved music shops in three out of eight identified clusters of market areas in Benin City. A semi-structured, researcher-administered questionnaire was also used to collect ...
Wohlfahrt P - - 2011
Central blood pressure (BP) has been shown to be a better predictor of target organ damage and cardiovascular events than brachial BP. Whether central BP is a better predictor of left ventricular hypertrophy (LVH) determined by electrocardiography (ECG) is not known. Radial applanation tonometry and ECG were performed in 728 ...
Eiken Ola - - 2011
OBJECTIVE: The aim was to investigate whether repeated exposures to moderate pressure elevations in the blood vessels of the arms (pressure training) affect pressure distension in arteries/arterioles of healthy individuals. METHODS: Pressure training and vascular pressure-distension determinations were conducted with the participant (nā€Š=ā€Š11) seated in a pressure chamber with one ...
Wilhelm Matthias - - 2011
Veteran endurance athletes have an increased risk of developing atrial fibrillation (AF), with a striking male predominance. We hypothesized that male athletes were more prone to atrial and ventricular remodeling and investigated the signal-averaged P wave and factors that promote the occurrence of AF. Nonelite athletes scheduled to participate in ...
Samiotaki Gesthimani G Department of Biomedical Engineering, Columbia University, New York, NY 10027, - - 2012
Focused ultrasound in conjunction with the systemic administration of microbubbles has been shown to open the blood-brain barrier (BBB) selectively, noninvasively and reversibly. In this study, we investigate the dependence of the BBB opening's reversibility on the peak-rarefactional pressure (0.30-0.60 MPa) as well as the microbubble size (diameters of 1-2, ...
Qin Jihong - - 2011
Within the two-leg t-J ladder, the spin dynamics of the pressure-induced two-leg ladder cuprate superconductor Sr(14-x)Ca(x)Cu(24)O(41) is studied based on the kinetic energy driven superconducting mechanism. It is shown that in the pressure-induced superconducting state, the incommensurate spin correlation appears in the underpressure regime, while the commensurate spin fluctuation emerges ...
Pauser Johannes - - 2011
Pauser J, Jendrissek A, Swoboda B, Gelse K, Carl H-D. Inaccuracy of a physical strain trainer for the monitoring of partial weight bearing. OBJECTIVE: To investigate the use of a physical strain trainer for the monitoring of partial weight bearing. DESIGN: Case series with healthy volunteers. SETTING: Orthopedic clinic. PARTICIPANTS: ...
Marcus Justin J Brain Institute, Department of Neurology, University of Miami, Miami, FL 33136, - - 2011
Elevated blood pressure (BP) is a risk factor for stroke and dementia, but the effect of BP, and change in BP over time, on white matter hyperintensity volume (WMHV) is not fully understood. Few studies have included Hispanics, who are at greater risk of stroke and dementia than non-Hispanic whites. ...
Yuda Satoshi - - 2011
Background: Two-dimensional speckle tracking imaging (2DS) enables quantitative measurement of left ventricular strain. However, application of 2DS for measurement of circumferential carotid arterial strain (CAS) is not fully elucidated. We investigated the feasibility and reproducibility of measuring CAS by 2DS and determinants of CAS in healthy subjects. Methods: Fifty-one healthy ...
Constantinides C - - 2011
This study examines (a) the temporal stability of hemodynamic indices of systolic and diastolic function in C57BL/6 mice under 1.5% isoflurane (ISO) (v/v) anesthesia conditions in 50:50 O(2)/N(2)O (v/v) within 90 min post-induction, and (b) the effects of Mn(2+) on the mouse hemodynamic response in male C57BL/6 mice (n = ...
Heffernan Kevin S - - 2011
Persons with multiple sclerosis (MS) have reduced gait performance and this is associated with disability and disease progression. The current study sought to test the hypothesis that higher central (aortic and carotid) and peripheral (brachial) pulse pressure (PP), manifestations of ventricular-vascular uncoupling related to increased arterial stiffness and pressure from ...
Mitchell E S - - 2011
The combination of theobromine and caffeine, methylxanthines found in chocolate, has previously been shown to improve mood and cognition. However, it is unknown whether these molecules act synergistically. This study tested the hypothesis that a combination of caffeine and theobromine has synergistic effects on cognition, mood and blood pressure in ...
Brock David W DW Department of Exercise and Movement Science, University of Vermont, Burlington, VT 05405-0068, USA. - - 2012
Two recent examinations reported a strong association between blood pressure (BP) and resting energy expenditure (REE), independent of body mass and body composition. Both reports postulate that neurohumoral processes that contribute to variation in REE may partly mediate the body mass effect on BP. Therefore, we examined the relationship of ...
Ramazanoglu M - - 2011
Neutron diffraction is used to show that small (∼7  MPa, or 70 bar) uniaxial pressure produces significant changes in the populations of magnetic domains in a single crystal of 2% Nd-doped bismuth ferrite. The magnetic easy plane of the domains converted by the pressure is rotated 60° relative to its original position. ...
Kobayashi Masato M Department of Clinical Physiology, Nagasaki University Graduate School of Biomedical Science, Nagasaki, - - 2011
Head elevation can restore airway patency during anesthesia, although its effect may be offset by concomitant bite opening or accidental neck flexion. The aim of this study is to examine the effect of head elevation on the passive upper airway collapsibility during propofol anesthesia. Twenty male subjects were studied, randomized ...
Hoyt David W - - 2011
A high-pressure magic angle spinning (MAS) NMR capability, consisting of a reusable high-pressure MAS rotor, a high-pressure rotor loading/reaction chamber for in situ sealing and re-opening of the high-pressure MAS rotor, and a MAS probe with a localized RF coil for background signal suppression, is reported. The unusual technical challenges ...
Kotsis Vasilios - - 2011
Differences in 24h blood pressure (BP) monitoring parameters such as average 24h BP, day to night BP ratio and BP variability could have an impact in arterial stiffness. The study hypothesis was that despite similar average BP values in ambulatory blood pressure monitoring subjects with increased 24h BP variability may ...
Lengyel E - - 2011
We carried out specific-heat and ac-susceptibility experiments under hydrostatic pressure to investigate the interplay of spin-density-wave antiferromagnetism (A) and superconductivity (S) in single-crystalline AS-type CeCu_{2}Si_{2}. We find evidence for a line of magnetic-field- and pressure-tuned quantum critical points in the normal state in the zero-temperature magnetic field-pressure plane. Our analysis ...
Roman Mary J - - 2011
The relative impacts of lowering blood pressure versus lowering low-density lipoprotein (LDL) cholesterol on regression of ventricular and arterial mass have not been systematically examined. Changes in left ventricular mass and arterial mass (common carotid artery cross-sectional area) after 36 months of simultaneous lowering of systolic blood pressure and LDL ...
Pavelescu Adriana - - 2011
Sildenafil and epoprostenol are effective therapies in pulmonary arterial hypertension (PAH). Both drugs increase cardiac output, which has been in part attributed to improved right ventricular (RV) contractility. We therefore used tissue Doppler imaging (TDI) to test whether sildenafil and epoprostenol might differently affect RV function in normal subjects before ...
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