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Results 501 - 550 of 2500
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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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 (n = 11) 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, ...
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: ...
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 ...
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 ...
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 ...
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 = ...
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 ...
Kaya Semira - - 2011
PURPOSE: To compare dynamic autoregulation in the Central Retinal Artery (CRA) and the Posterior Ciliary Arteries (PCAs) after a step decrease in systemic blood pressure. METHODS: Ten healthy male young subjects were studied. Flow velocities in retrobulbar vessels and systemic blood pressure were recorded in each subject before, during, and ...
Kremer Werner - - 2011
The introduction of the multidimensional NMR spectroscopy was a breakthrough in biological NMR me-thodology since it allowed the unequivocal correlation of different spin states of the system. The introduction of large pressure perturbations in the corresponding radio frequency (RF) pulse sequences adds an extra structural dimension into these experiments. We ...
Schumann S - - 2011
Background: Heartbeat-related pressure oscillations appear at the airway opening. We investigated whether these cardiogenic oscillations (COS) - extracted from spontaneous breathing signals - reflect the compliance of the respiratory system. Methods: Fifteen volunteers breathed spontaneously at normal or reduced chest wall compliance, i.e. with and without thorax strapping, and at ...
Nishihara Makoto - - 2011
To test the hypothesis that the N1 component of auditory evoked potentials (AEPs) is one form of the change-related response elicited by an abrupt change in sound pressure from a silent background, two AEP experiments were conducted. Change-N1 was evoked by a test stimulus at 70dB following a 3-s conditioning ...
Szafrański Marek - - 2011
A guanidinium compound, [C(NH2)3]5SO4(SO3-OC2H5)2F, with complex anionic sublattice has been synthesized and characterized by calorimetric and dielectric measurements at ambient and high hydrostatic pressures, as well as by single-crystal X-ray diffraction at varied temperatures. At room temperature the crystal structure is orthorhombic, space group Pnma. In this phase each of ...
Bai Yongyi - - 2011
The mechanisms of non-hypertensive intracerebral hemorrhages (ICH), which may have different pathologies, mechanisms and genetic background from hypertensive ICH, are not clear. MicroRNAs are a new class of endogenous small RNAs that negatively regulate gene expression at the posttranscriptional level. Previous studies indicate that vascular smooth muscle cell (VSMC) function ...
Samudrala Gopi K - - 2011
High pressure x-ray diffraction studies have been performed on the heavy rare earth metal erbium (Er) in a diamond anvil cell at room temperature to a pressure of 151 GPa and Er has been compressed to 40% of its initial volume. The rare earth crystal structure sequence [Formula: see text] fcc ...
Mills Nicholas L NL The BHF/University Centre for Cardiovascular Science, Edinburgh University, The Queens Medical Research Institute, 47 Little France Crescent, Edinburgh EH16 4TJ, - - 2011
Exposure to road traffic and air pollution may be a trigger of acute myocardial infarction, but the individual pollutants responsible for this effect have not been established. We assess the role of combustion-derived-nanoparticles in mediating the adverse cardiovascular effects of air pollution. To determine the in vivo effects of inhalation ...
Mesquida Jaume J Cardiopulmonary Research Laboratory, Department of Critical Care Medicine, University of Pittsburgh Medical Center, 606 Scaife Hall, 3550 Terrace Street, Pittsburgh, PA 15261, - - 2011
We evaluated the impact of increasing tidal volume (V (t)), decreased chest wall compliance, and left ventricular (LV) contractility during intermittent positive-pressure ventilation (IPPV) on the relation between pulse pressure (PP) and LV stroke volume (SV(LV)) variation (PPV and SVV, respectively), and intrathoracic blood volume (ITBV) changes. Sixteen pentobarbital-anesthetized thoracotomized ...
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