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Results 501 - 550 of 2429
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Sanchez-Gonzalez M A - - 2011
The augmentation index (AIx), a marker of wave reflection, decreases following acute leg exercise. Passive vibration (PV) causes local vasodilation that may reduce AIx. This study investigated the effects of acute PV on wave reflection and aortic hemodynamics. In a crossover fashion 20 (M=9, F=11) healthy young (22±3 year) participants were ...
Veit Lena - - 2011
How do animals with learned vocalizations coordinate vocal production with respiration? Songbirds such as the zebra finch learn their songs, beginning with highly variable babbling vocalizations known as subsong. After several weeks of practice, zebra finches are able to produce a precisely timed pattern of syllables and silences, precisely coordinated ...
Allet Lara - - 2011
PURPOSE: Joint moments have been acknowledged as key factors in understanding gait abnormalities. Gait velocity is further known to affect joint moments and foot pressures. Keeping gait velocity constant is thus a strategy to cancel out the influence of different preferred gait speed between groups. But even if gait velocity ...
Lindstedt Sandra - - 2011
Right ventricular heart rupture is a devastating complication associated with negative pressure wound therapy (NPWT) following cardiac surgery. The use of a rigid disc has been suggested to offer protection against this lethal complication by preventing the heart from being drawn up towards, and damaged by, the sharp sternum edges. ...
Mickle Karen J - - 2011
Older people with toe deformities have been identified as having an increased risk of falling. Little is known, however, about the biomechanical changes that might contribute to this increased risk. Therefore, the purpose of this study was to determine whether older people with hallux valgus and lesser toe deformities displayed ...
Tibbling Lita - - 2011
To study the relationship between upper esophageal sphincter (UES) relaxation, peristaltic pressure and lower esophageal sphincter (LES) relaxation following deglutition in non-dysphagic subjects. Ten non-dysphagic adult subjects had a high-resolution manometry probe passed transnasally and positioned to cover the UES, the esophageal body and the LES. Ten water swallows in ...
Li Shuqiang - - 2011
Essential hypertension has been recognized as a disease resulting from a combination of environmental and genetic factors. Recent studies demonstrated that microRNAs (miRNAs) are involved in cardiac hypertrophy and heart failure. However, little is known about the roles of miRNAs in essential hypertension. Using microarray-based miRNA expression profiling, we compared ...
Henrik Odland Hans - - 2011
Systolic longitudinal myocardial function is important for cardiac ejection. Data describing hemodynamic determinants and the time course of myocardial longitudinal contraction as measured by tissue Doppler are lacking. 10 newborn pigs were used for invasive hemodynamic investigation. Tissue Doppler assessment of the lateral part of the mitral valve annulus during ...
Desgranges F-P - - 2011
BACKGROUND: /st> Plethysmographic variability index (PVI) is an accurate predictor of fluid responsiveness in mechanically ventilated patients. However, the site of measurement of the plethysmographic waveform impacts its morphology and its respiratory variation. The goal of this study was to investigate the ability of PVI to predict fluid responsiveness at ...
Sormo E G - - 2011
Due to the extremely high affinity of selenium (Se) to mercury (Hg), Se sequesters Hg and reduces its biological availability in organisms. However the converse is also true. Hg sequesters Se, causing Hg to inhibit the formation of Se dependent enzymes while supplemental Se supports their continued synthesis. Hence, whether ...
Pahlevan Niema M - - 2011
Elevated pulse pressure (pp) is considered to be a risk factor for adverse cardiovascular events since it is directly related to an elevated myocardial workload. Information about both pressure and flow wave must be provided to assess hemodynamic complexity and true level of external left ventricular power (ELVP). pp value ...
Verkouteren Mike - - 2011
We report highly reproducible gravimetric and optical measurements of microdroplets that lend insights into the fundamentals of drop-on-demand (DOD) printing. Baseline fluidic pressure within the DOD dispenser was controlled to within 0.02 hPa, enabling long-term stability in dispensed droplet mass with observed variations near 1 % (RSD) for isobutanol. The ...
Sun Zhimei - - 2011
Ge(2)Sb(2)Te(5) (GST) is a technologically very important phase-change material that is used in digital versatile disks-random access memory and is currently studied for the use in phase-change random access memory devices. This type of data storage is achieved by the fast reversible phase transition between amorphous and crystalline GST upon ...
Boet Sylvain - - 2011
BACKGROUND: Cricoid pressure is a routine component of rapid sequence induction and is designed to reduce the risk of reflux and its associated morbidity. Recent studies have raised questions regarding the efficacy of cricoid pressure in terms of changes in the pharyngeal and esophageal anatomy. OBJECTIVE: This current descriptive study ...
Blankstein Michael - - 2011
OBJECTIVES:: The objective of this study was to assess the effects of fat embolism on rabbit physiology. METHODS:: After anesthetic administration, both femoral condyles of the right knee only of 23 New Zealand white rabbits were exposed through a medial parapatellar approach to the knee. In the pulmonary fat embolism ...
Caselli Stefano - - 2011
AIMS: We sought to investigate the systolic time interval (STI) and efficiency of left ventricular (LV) contraction comparatively in elite athletes and healthy sedentary controls by means of three-dimensional echocardiography (3DE). METHODS AND RESULTS: Four hundred and twenty-nine elite athletes, involved in skill (n = 41), power (n = 63), ...
Mudraya I S - - 2011
Multicycle harmonic (Fourier) analysis of bioimpedance was employed to simultaneously assess circulation and neural activity in visceral (rat urinary bladder) and somatic (human finger) organs. The informative value of the first cardiac harmonic of the bladder impedance as an index of bladder circulation is demonstrated. The individual reactions of normal ...
Garbella Erika - - 2011
To evaluate pulmonary alveolar-capillary membrane integrity and ventilation/perfusion mismatch after breath-hold diving. Pulmonary diffusing capacity to carbon monoxide (DLCO) and nitric oxide (DLNO), haemoglobin (Hb) and haematocrit (Hct) were measured in six elite divers before and at 2, 10 and 25 minutes after a maximal breath-hold dive to a depth ...
Liu Shuang - - 2011
Adjunctive therapies that reduce the cerebral edema in bacterial meningitis include osmotic agents. There is a lack of information comparing mannitol vs. hypertonic saline as an osmotic agent for adjunctive therapy of bacterial meningitis. We attempted to elucidate the impact of hypertonic saline in cerebral edema in the setting of ...
Sieber Arne - - 2011
Recently developed prototypes of zirconium dioxide and NASICON-based micro solid-state electrolyte oxygen (O2) and carbon dioxide (CO2) sensors were tested for their potential suitability in rebreathers. The O2 sensor has a quasi-indefinite lifetime, whilst that of the CO2 sensor is approximately 700 h. This is a preliminary report of a ...
Taylor Chloe E - - 2011
Diminished baroreflex sensitivity in the morning negatively influences morning coronary blood flow and blood pressure control in hypertensive patients. Our aim was to determine the contribution of the mechanical and neural components of the cardiac baroreflex to diurnal variation in blood pressure control. In 12 healthy participants, we used the ...
Zhang Ziheng - - 2011
A novel MR imaging technique, spatial modulation of magnetization with polarity alternating velocity encoding (SPAMM-PAV), is presented to simultaneously examine the left ventricular early diastolic temporal relationships between myocardial deformation and intra-cavity hemodynamics with a high temporal resolution of 14 ms. This approach is initially evaluated in a dynamic flow ...
Zheng D - - 2011
It is accepted that accuracy of auscultatory blood pressure (BP) measurement is influenced by measurement conditions. However, there is little comparative quantitative clinical data. The aim of this study was to provide these data. Auscultatory systolic and diastolic BPs (SBPs and DBPs) were measured in 111 healthy subjects under five ...
Hodt Anders - - 2011
Background:  In normal left ventricles (LV), counterclockwise rotation (CCR) and net twist angle (NTA) have shown important roles during ejection. We investigated the effect of reduced preload by lower body negative pressure (LBNP) on CCR and NTA. Methods and Results:  Twelve healthy men were examined at rest, LBNP -20 and ...
Ando Masahiko - - 2011
Continuous-flow left ventricular assist devices (LVADs) have greatly improved the prognosis of patients with end-stage heart failure, even if continuous flow is different from physiological flow in that it has less pulsatility. A novel pump controller of continuous-flow LVADs has been developed, which can change its rotational speed (RS) in ...
Tandon Vishal - - 2011
Using phase-sensitive streaming potential experiments in a vacuum chamber, we demonstrate that lowering the ambient pressure of the air surrounding a hydrophobic, Zeonor microfluidic substrate results in a decrease in the time scale required for equilibration of the electrokinetic potential. At ambient air pressures below 0.74atm, the electrokinetic potential changes ...
Evans Caroline S - - 2011
In subjects with previous preeclampsia, differences in cardiovascular and/or blood biochemical parameters are present in the nonpregnant state, and a simultaneous assessment of multiple derived indices better differentiates between women with or without previous preeclampsia. We examined 18 previous preeclamptic and 50 previous uncomplicated pregnancies, ≈16 months postpartum. Cardiovascular assessment ...
Nedredal Geir I - - 2011
To investigate the correlation between MR elastography (MRE) assessed spleen stiffness and direct portal vein pressure gradient (D-HVPG) measurements in a large animal model of portal hypertension. Cholestatic liver disease was established in adult canines by common bile duct ligation. A spin echo based echo planar imaging (EPI) MRE sequence ...
Martino Tami A - - 2011
Our objective was to test the hypothesis that there is a significant diurnal variation for the therapeutic benefit of angiotensin-converting enzyme (ACE) inhibitors on pressure-overload cardiovascular hypertrophy. Physiological and molecular processes exhibit diurnal rhythms that may affect efficacy of disease treatment (chronotherapy). Evidence suggests that the heart primarily remodels during ...
Klein Heidi E - - 2011
Objective-To determine the effect of eyelid manipulation and manual jugular compression on intraocular pressure (IOP) measurement in clinically normal dogs. Design-Randomized clinical trial. Animals-30 dogs (57 eyes) without diseases or medications that affect IOP. Procedures-An applanation tonometer was used to measure IOP during eyelid manipulation or jugular compression. Six manipulations ...
Grassi Daniel de Oliveira Dde - - 2011
The biomechanics of the sacroiliac joint makes the pelvic segment responsible for proper weight distribution between lower extremities; however, it is known to be susceptible to altered mobility. The objective of this study was to analyze baropodometric responses following thrust manipulation on subjects with sacroiliac joint restrictions. Twenty asymptomatic subjects ...
Muriuki M G - - 2011
BACKGROUND: The biomechanical effects of radial split tears and vertical tears of the medial meniscus are not well characterized. The goal of the present study was to determine the effects of these meniscal tears and meniscal repair on tibiofemoral joint contact pressure and area. METHODS: Eleven fresh-frozen cadaveric knees were ...
Mizote Masanori - - 2011
PURPOSE: To investigate the protective effects of D: -allose, a rare sugar, on pressure-induced ischemia during vitrectomy in the rabbit eye. METHODS: The rabbits underwent pars plana vitrectomy, and continuous intraocular irrigation at a perfusion pressure of 140 mmHg was performed for 45 min. Intraocular pressure was regulated by adjusting the height ...
Dua Kulwinder - - 2011
Aerodigestive reflexes triggered by pharyngeal stimulation can protect the airways by clearing fluid from the pharynx. The objective of this study was to determine the relationship between the maximum capacity of fluid that can safely dwell in the hypopharynx [hypopharyngeal safe volume (HPSV)] before spilling into the larynx and the ...
Meng Xiu-Jun - - 2011
OBJECTIVE: To assess the prevalence, awareness, treatment, and control of hypertension and their associated factors in an urban Chinese population. METHODS: A cross-sectional study was conducted in three cities in northeast China from 2009 to 2010, using a multistage cluster sampling method to select a representative sample. A total of ...
Koenig Laura L - - 2011
In obstruent consonants, a major constriction in the upper vocal tract yields an increase in intraoral pressure (P(io)). Phonation requires that subglottal pressure (P(sub)) exceed P(io) by a threshold value, so as the transglottal pressure reaches the threshold, phonation will cease. This work investigates how P(io) levels at phonation offset ...
Brook Robert D - - 2011
Levels of fine particulate matter [≤ 2.5 μm in aerodynamic diameter (PM(2.5))] are associated with alterations in arterial hemodynamics and vascular function. However, the characteristics of the same-day exposure-response relationships remain unclear. We aimed to explore the effects of personal PM(2.5) exposures within the preceding 24 hr on blood pressure ...
Jacobshagen Claudius - - 2011
BACKGROUND: Heart failure with preserved ejection fraction (HFpEF), formerly referred to as diastolic heart failure (DHF), accounts for >50% of all HF patients. So far, there has been no specific treatment for impaired left ventricular (LV) relaxation. Data from in vitro and animal studies indicate that ranolazine improves diastolic function ...
Lieber A - - 2011
Drugs acting on cardiovascular (CV) prevention are, by definition, interconnected with age-induced arterial changes. However, this question has been poorly investigated along long-term treatment. This goal requires a major prerequisite: to determine statistical links associating age-induced changes in arterial stiffness and wave reflections with drug classes acting on CV prevention. ...
McIlveen S - - 2011
Aim:  Baroreflex control of the bronchial circulation is unresolved. Early studies suggested that baroreflexes dilate or have no effect, but recent studies in awake dogs suggested baroreflexes did not normally engage tonic vasoconstrictor efferents but during excitement systemic pressure rises may also trigger local sensory-motor dilator reflexes. We examined the ...
Wimmer Jürgen - - 2011
OBJECTIVE: This study aimed at assessing the evolution of cardiovascular characteristics during hemodialysis and ultrafiltration by a perturbation accurately defined in its magnitude and directly relevant to the problem of volume adjustment in stable hemodialysis patients. METHODS: Excess fluid volume was removed by constant ultrafiltration-rate as prescribed. Hemodynamic variables were ...
Chitnis Parag V - - 2011
Polymer-shelled micro-bubbles are employed as ultrasound contrast agents (UCAs) and vesicles for targeted drug delivery. UCA-based delivery of the therapeutic payload relies on ultrasound-induced shell rupture. The fragility of two polymer-shelled UCAs manufactured by Point Biomedical or Philips Research was investigated by characterizing their response to static overpressure. The nominal ...
Jennings J R - - 2012
The aim of the study was to determine whether the reduction in brain grey matter volume associated with hypertension persisted or was remediated among hypertensive patients newly treated over the course of a year. A total of 41 hypertensive patients were assessed over the course of a 1-year successful anti-hypertensive ...
Zeng Jing - - 2011
Previous studies have demonstrated that individual anti-hypertension medications have different effects when administered in the morning vs. the evening. However, the impact of administration timing on fixed combinations of anti-hypertensive medications on blood pressure control is still unknown. In the present study, we examined the administration time-dependent effects of a ...
Paxton William H WH - - 2011
Delayed pressure urticaria is a rare form of physical urticaria. After a pressure stimulus, erythematous painful wheals may develop after a delay of 1 to 12 hours. After manifestation these lesions may last for up to 72 hours. The case report presented here describes the successful intraoperative management of a ...
Wehausen Conni E - - 2011
Objective-To determine effects of bovine hemoglobin glutamer-200 (Hb-200) solution on systolic arterial blood pressure (SAP) in hypotensive cats and describe potential adverse effects associated with this treatment. Design-Retrospective case series. Animals-44 cats. Procedures-Medical records of hypotensive (Doppler SAP ≤ 80 mm Hg) cats that received Hb-200 treatment were reviewed. Volume ...
Sosnoff Jacob J - - 2011
The purpose of the current investigation was to examine the relation between cardioballistic impulse and the fluctuations in continuous isometric force production. Subjects produced isometric force via index finger flexion to constant force targets (0.5, 1 and 2 N) with and without visual feedback while beat to beat blood pressure ...
Wang Hai-Ling - - 2011
Objective To explore the changes in plasma angiotensin II (Ang II) and circadian rhythm of blood pressure among hypertensive patients with sleep apnea syndrome (SAS) before and after continuous positive airway pressure (CPAP) or surgical treatment. Methods A total of 180 essential hypertension patients were enrolled in our study. The ...
De Caterina Alberto Ranieri - - 2011
National and international guidelines still recommend β-blockers (BBs) as first-line agents in uncomplicated prevention of hypertension. However, it has been shown that BBs reduce blood pressure less than other drugs, specifically with regard to central aortic pressure. More importantly, recent meta-analyses have highlighted that in primary prevention BBs are associated ...
Singhal Deepika D Department of Ophthalmology, Surat Municipal Institute of Medical Education and Research, Surat, Indian Institute of Public Health, Gandhinagar, - - 2011
To study the effect of brimonidine on intraocular pressure (IOP) following capsulotomy among Indian subjects. The study was a nonrandomized trial with open label. 80% of the subjects showed a decrease in IOP after instilling 0.2% brimonidine (1 hour pre capsulotomy). No such decrease was observed in control. After 1 ...
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