Search Results
 Results 401 - 450 of 2500 < 4 5 6 7 8 9 10 11 12 13 14 > 401 Chun R - - 2012 BACKGROUND: This study was conducted to assess the feasibility of measuring intra-abdominal pressure in term parturients under spinal anesthesia. METHODS: Intra-abdominal pressure was measured in 20 term parturients after spinal anesthesia for elective caesarean section. Pressure was measured in the supine and 10° left lateral tilt positions with a constant ... 402 Nyberg Michael - - 2012 We examined the role of nitric oxide (NO) and prostanoids in the regulation of leg blood flow and systemic blood pressure before and after 8 weeks of aerobic high-intensity training in individuals with essential hypertension (n = 10) and matched healthy control subjects (n = 11). Hypertensive subjects were found ... 403 Dumas Tara M - - 2012 We examined identity development as a moderator of the relation between peer group pressure and control and adolescents' engagement in risk behaviors. Participants (n=1070; M(age)=15.45 years) completed a self-report measure of identity exploration, the degree to which they have explored a variety of self-relevant values, beliefs and goals, and identity ... 404 Bach David S - - 2012 OBJECTIVE: Pressure recovery results in Doppler gradients greater than catheter gradients and is well established in association with bileaflet mechanical aortic valves. Because pressure recovery is influenced by orifice geometry, it might manifest differently with various valve prostheses. If true, then the reliability of Doppler echocardiography for the estimation of ... 405 Chen Szu-Ying - - 2012 BACKGROUND: Previous studies on the effects of acute air pollution have focused primarily on blood pressure (BP). METHODS: Our study enrolled 9238 nonsmoking adults over 30 years of age from 6 townships in Taiwan: 1 seaport, 1 urban, 1 industrial, and 3 rural. Using generalized additive models, we evaluated the ... 406 Wasserthal Lutz Thilo - - 2012 In Calliphoridae and Drosophilidae, the dorsal vessel (heart and aorta with associated venous channels) is the only connection between the thorax and the abdomen. Hemolymph oscillates between the compartments by periodic heartbeat reversal, but both the mechanism and its influence on hemocoelic and tracheal pressure have remained unclear. The pumping ... 407 D'Andrea Antonello - - 2012 BACKGROUND: Although cardiac adaptation to different sports has been extensively described, the potential relationship of training with aortic root (AR) elastic properties and diameters in top-level athletes remains not fully investigated. The aims of this study were to compare AR morphology and stiffness between highly trained athletes and sedentary subjects ... 408 Imam H - - 2012 We examined the value of impedance monitoring in measuring bolus volume compared with videoesophagram. Eighty consecutive subjects were studied with simultaneous impedance-manometry-videoesophagram. A catheter with both an impedance electrode pair and a pressure transducer at four sites (5, 10, 15, 20 cm above lower esophageal sphincter) was passed per nares. Six ... 409 Sant'ana A J - - 2012 BACKGROUND:Acute normovolemic hemodilution (ANH) is an alternative to blood transfusion in surgeries involving blood loss. This experimental study was designed to evaluate whether pulse pressure variation (PPV) would be an adequate tool for monitoring changes in preload during ANH, as assessed by transesophageal echocardiography. METHODS: Twenty-one anesthetized and mechanically ventilated ... 410 Krause Fabian - - 2012 BACKGROUND: Hindfoot trauma including ankle and subtalar sprains may be followed by osteochondral lesions and persisting pain originating from posttraumatic arthritis. HYPOTHESIS: "Acute severe" supination sprains and "mild supination sprains with increasing ligamentous incompetence" of the hindfoot lead to medial ankle and subtalar stress concentrations that may contribute to osteochondral ... 411 Handzel Ophir - - 2012 OBJECTIVE: To describe for the first time a method of recording of Eustachian tube (ET) function by simultaneous and synchronous endoscopy and sonotubometry and explore its advantages compared with the performance of these tests independently. STUDY DESIGN: Observational study. SETTING: Academic tertiary medical center. PATIENTS: Eighteen healthy subjects. INTERVENTION: Endoscopic ... 412 Tadapaneni Ravi Kiran - - 2012 The present study investigated processing strategies and matrix effects on antioxidant capacity (AC) and polyphenols (PP) content of fruit-based beverages: 1) Strawberry powder (Str) + Dairy, D-Str; 2) Str + Water, ND-Str; 3) Dairy + no Str, D-NStr. Beverages were subjected to high temperature-short time (HTST) and high pressure processing ... 413 Baldini M - - 2012 The pressure dependence of the Curie temperature T(C)(P) in La(0.75)Ca(0.25)MnO(3) was determined by neutron diffraction up to 8 GPa, and compared with the metallization temperature T(IM)(P) (Postorino et al 2003 Phys. Rev. Lett. 91 175501). The behavior of the two temperatures appears similar over the whole pressure range, suggesting a key ... 414 Ait-Oufella Hafid - - 2012 Previous studies have shown a good agreement between central venous pressure (CVP) measurements from catheters placed in superior vena cava and catheters placed in the abdominal cava/common iliac vein. However, the influence of intra-abdominal pressure on such measurements remains unknown. We conducted a prospective, observational study in a tertiary teaching ... 415 Kim In-Hee - - 2012 The purpose of this study was to identify the effects of essential oil inhalation on the 24-hour ambulatory blood pressure (BP) and salivary cortisol level in 83 prehypertensive and hypertensive subjects. The experimental group (n = 28) was asked to inhale an essential oil blended with lavender, ylang-ylang, marjoram, and ... 416 Fan Ming Ming - - 2012   To determine the effect of cholecystectomy on the motility of the sphincter of Oddi (SO).   Pressures of common bile duct (CBD), SO motility and its response to bolus injections of cholecystokinin (CCK, 20 ng/kg and 100 ng/kg) were detected respectively by manometry in eight Beagle dogs before and after cholecystectomy. ... 417 Neisius Ulf - - 2012 We assessed the relationship between pulse pressure and intermediate cardiovascular phenotypes in a middle-aged cohort with high prevalence of hypertension. It has been suggested that central pulse pressure (cPP) is a better predictor of cardiovascular outcome than peripheral pulse pressure (pPP), particularly in the elderly. Yet, it is unclear if ... 418 Dave Jaydev K - - 2012 To develop a new noninvasive approach to quantify left ventricular (LV) pressures using subharmonic emissions from microbubbles, an ultrasound scanner was used in pulse inversion grayscale mode; unprocessed radiofrequency data were obtained with pulsed wave Doppler from the aorta and/or LV during Sonazoid infusion. Subharmonic data (in dB) were extracted ... 419 Sanders Joan E - - 2012 The purpose of this research was to investigate the influence of sock addition and removal on residual-limb fluid volume in people using prosthetic limbs. We used bioimpedance analysis to measure residual-limb extracellular fluid volume on 28 transtibial amputee subjects during 30 min test sessions. Upon addition of a one-ply polyester ... 420 Westenberg Jos J M - - 2012 The Bramwell-Hill model describes the relation between vascular wall stiffness expressed in aortic distensibility and the pulse wave velocity (PWV), which is the propagation speed of the systolic pressure wave through the aorta. The main objective of this study was to test the validity of this model locally in the ... 421 Ilesanmi Olayinka Stephen - - 2012 The health systems designed to cater for patients with chronic illnesses like hypertension have not fully evaluated the burden of long term therapy and its effect on patient outcome. This study assessed the financial implication and cost effectiveness of hypertension treatment in a rural Nigerian town. A chart review of ... 422 Clays Els - - 2012 While moderate and vigorous leisure time physical activities are well documented to decrease the risk for cardiovascular disease, several studies have demonstrated an increased risk for cardiovascular disease in workers with high occupational activity. Research on the underlying causes to the contrasting effects of occupational and leisure time physical activity ... 423 Prakash Smita S Department of Anaesthesia and Intensive Care, Vardhman Mahavir Medical College and Safdarjang Hospital, New Delhi, - - 2012 Baroreflex failure results in wide excursions of blood pressure and heart rate. We report two cases that developed severe postoperative hypertension after radical neck dissection. Carotid sinus denervation during neck dissection may be the cause of the reflex hypertension once general anesthesia-induced vasodilatation has ended. 424 Czosnyka Marek M Academic Neurosurgical Unit, Addenbrooke's Hospital, Cambridge, UK. - - 2012 The cerebrovascular time constant (τ) describes the time to establish a change in cerebral blood volume after a step transient in arterial blood pressure (ABP). We studied the relationship between τ, ABP, intracranial pressure (ICP), and end-tidal carbon dioxide concentration (EtCO2). Recordings from 46 anaesthetized, paralysed and ventilated New Zealand ... 425 Broström Anders A Department of Nursing Science, Jönköping University, Sweden. - - 2012 Obstructive sleep apnoea (OSA) has been linked to hypertension in sleep clinic populations, but little is known about the symptom profile of undiagnosed OSA in hypertensive outpatients in primary care. To explore characteristics associated with undiagnosed OSA in hypertensive primary care patients. Cross-sectional design, including 411 consecutive patients (52% women), ... 426 Rosendorff Clive C Department of Medicine, James J. Peters VA Medical Center, Bronx, NY 10468, USA. - - 2012 There are very few data on the relationship between systolic blood pressure (SBP), diastolic blood pressure (DBP), arterial compliance, and left ventricular structure and function, particularly left ventricular hypertrophy (LVH), in the very elderly (>75 years). SBP and arterial stiffness increase with age, and the question is: which of the ... 427 Fourchet François - - 2011 This study aimed to compare foot plantar pressure distribution while jogging and running in highly trained adolescent runners. Eleven participants performed two constant-velocity running trials either at jogging (11.2±0.9km/h) or running (17.8±1.4km/h) pace on a treadmill. Contact area (CA in cm(2)), maximum force (F(max) in N), peak pressure (PP in ... 428 Bode Aron S - - 2011 BACKGROUND: Despite routine ultrasound mapping of upper extremity arteries and veins, early thrombosis and nonmaturation remain frequent complications following vascular access (VA) surgery. Besides vascular diameters, brachial artery stiffness is assumed to play an important role; however, reproducibility of measurements has never been established. The purpose of this study was ... 429 Hermeling Evelien - - 2011 BACKGROUND:: The current standard for arterial stiffness assessment, aortic pulse wave velocity (aPWV), is measured at diastolic pressure. Arterial stiffness, however, is pressure dependent. At the carotid artery level, the degree of this dependency can be quantified as the difference (ΔPWV) between systolic and diastolic (cPWVd) carotid pulse wave velocity. ... 430 Todd Alwyn S - - 2011 Background:  Studies of dietary sodium on vascular function and blood pressure (BP) in normotensive volunteers have shown conflicting results. There is very limited data available on the effect of chronic sodium loading from a low-sodium diet to a high-sodium diet on vascular function and BP in normotensive volunteers. Objective:  To ... 431 Girshberg Y - - 2012 Pressure has a profound effect on the paraelectric and ferroelectric properties of perovskite crystals. In this paper we theoretically investigate the effect of pressure on the cubic-to-tetragonal phase transition and on the soft mode dynamics of some classical perovskite crystals: BaTiO(3), PbTiO(3), and KNbO(3). We use a model consisting of ... 432 Mahjoub Y - - 2011 BACKGROUND: /st>In the intensive care unit, intra-abdominal hypertension (IAH) is a frequently encountered, life-threatening condition. The aim of this animal study was to evaluate the effect of IAH on left ventricular (LV) relaxation (i.e. the active phase of diastole). METHODS: /st>Seven male rabbits were anaesthetized before mechanical ventilation. A 20 ... 433 Merabet Nassiba - - 2011 The study addressed the hypothesis that soluble epoxide hydrolase (sEH) inhibition, which increases cardiovascular protective epoxyeicosatrienoic acids (EETs), exerts beneficial effects in an established chronic heart failure (CHF) model. In CHF rats, left ventricular (LV) function, perfusion and remodeling were assessed using MRI and invasive hemodynamics after 42-day (starting 8days ... 434 Yiou E - - 2011 During leg flexion from erect posture, postural stability along the medio-lateral direction is organized in advance during "anticipatory postural adjustments" (APAs). This study aimed to investigate the influence of temporal pressure on this anticipatory postural control of medio-lateral stability. Eight young healthy participants performed series of leg flexions (1) as ... 435 Hsiu Hsin - - 2011 Abstract Background: Cold stimulation (CS) accompanied by vasoconstriction can increase the stiffness of the arterial system. The vascular responses during CS have been studied using photoplethysmography (PPG), but most have focused on time-domain waveform indexes. Focusing on the radial arterial blood pressure (BPW) and the finger PPG waveforms, we aimed ... 436 Corazza Ivan - - 2011 The aim of this paper is to clarify some physical-mechanical aspects involved in the carbon dioxide angiography procedure (CO(2) angiography), with a particular attention to a possible damage of the vascular wall. CO(2) angiography is widely used on patients with iodine intolerance. The injection of a gaseous element, in most ... 437 Sutrakar Vijay Kumar - - 2011 Atomistic simulation of initial ⟨100⟩ oriented FCC Cu nanowires shows a novel coupled temperature-pressure dependent reorientation from ⟨100⟩ to ⟨110⟩ phase. A temperature-pressure-induced solid-solid ⟨100⟩ to ⟨110⟩ reorientation diagram is generated for Cu nanowire with varying cross-sectional sizes. A critical pressure is reported for Cu nanowires with varying cross-sectional sizes, ... 438 Feng Bibo - - 2012 A device is presented for efficiently enriching parahydrogen by pulsed injection of ambient hydrogen gas. Hydrogen input to the generator is pulsed at high pressure to a catalyst chamber making thermal contact with the cold head of a closed-cycle cryocooler maintained between 15 and 20K. The system enables fast production ... 439 Saranathan Archana A Department of Orthopaedic Surgery, Calhoun Research Laboratory, Akron General Medical Center, 400 Wabash Avenue, Akron, OH, 44307, - - 2012 The study was performed to characterize the influence of tibial tuberosity realignment on the pressure applied to cartilage on the patella in the intact condition and with lesions on the lateral and medial facets. Ten knees were loaded in vitro through the quadriceps (586 N) and hamstrings (200 N) at ... 440 Bhagat Anumeha - - 2011 Pulse examination by palpation of a peripheral artery against a bony prominence is the most commonly used and widely accepted method. However this is subjective and thus prone to errors. Although pulse waveform was recorded in the 19th century, it did not gain popularity because of inconvenience in using the ... 441 Bamberger Philip David - - 2011 The cerebral metabolic and vascular effects of intravenous norepinephrine have been shown in an animal model using somatosensory-evoked potentials (SSEPs). A case of intravenous norepinephrine resulting in a decrease in SSEP amplitude (of greater than 50%) despite no significant change in blood pressure, prior to cross-clamping during a carotid endarterectomy ... 442 Anile Carmelo - - 2011 The analysis of cerebrospinal fluid (CSF) pulse pressure waveform has been considered as a reliable method to investigate the intracranial system (ICS) dynamics. We have examined the morphological changes of the CSF pulse wave and of the sagittal sinus pressure (SSP) wave during a progressive increase in intracranial pressure (ICP) ... 443 Hughson R L - - 2012 Early evidence from long-duration flights indicates general cardiovascular deconditioning, including reduced arterial baroreflex gain. The current study investigated the spontaneous baroreflex and markers of cardiovascular control in six male astronauts living for 2-6 mo on the International Space Station. Measurements were made from the finger arterial pressure waves during spontaneous ... 444 Tanaka Yoshifumi Y Faculty of Economics, Tezukayama University, 7-1-1 Tezukayama, Nara 631-8501, Japan. - - 2011 The primary purpose of the present study was to examine kinematic characteristics and force control during a golf-putting task under a pressure condition. The secondary purpose was to provide an exploratory investigation of the relationship between changes in behavior (kinematics and force control) and performance on the one hand, and ... 445 Heffernan Kevin S - - 2011 Subacute and chronic cardiac adaptations to marathon running may increase risk for sudden death. Herein, it is proposed that cardiac arrhythmogenic remodeling resulting from prolonged strenuous exertion may also have a systemic vascular component. Marathon running reduces coronary pulse pressure and causes acute endothelial damage, possibly via altering concentrations of ... 446 Sariali Elhadi - - 2011 A finite elements model was developed in order to evaluate the combined influence of the head lateral microseparation and the cup abduction angle on the contact pressure in Ceramic-on-Ceramic Total Hip Arthroplasty. The model's parameters were those used on the Leeds II hip simulator. A 32mm head diameter and a ... 447 Dean Mason N - - 2011 Chimaera (Holocephali) are cartilaginous fishes with flexible operculi rather than external gill slits, suggesting ventilation occurs in a manner different from other fishes. We examined holocephalan ventilation morphology, behavior, and performance by anatomical investigations, high-speed video, and in vivo pressure measurements from the buccal and parabranchial cranial cavities in Hydrolagus ... 448 Jiang Kai - - 2011 Bismuth ferrite (BiFeO$_3$) nanocrystalline films with the crystalline size of 27-40 nm have been grown on {\it c}-sapphire substrates under various oxygen pressures of 10$^{-4}$-1 Pa by pulsed laser deposition. The X-ray diffraction spectra show that the films are polycrystalline and present the pure rhombohedral phase. It was found that ... 449 Sonoda H - - 2011 The present study investigated factors that modify or affect arterial stiffness as assessed by brachial-ankle pulse wave velocity (baPWV) in the general population. Subjects had previously participated in a physical checkup program (n=911), and baPWV and urinary albumin and sodium excretion were also measured. Urine albumin was expressed as the ... 450 Sakka L - - 2011 The cerebrospinal fluid (CSF) is contained in the brain ventricles and the cranial and spinal subarachnoid spaces. The mean CSF volume is 150ml, with 25ml in the ventricles and 125ml in subarachnoid spaces. CSF is predominantly, but not exclusively, secreted by the choroid plexuses. Brain interstitial fluid, ependyma and capillaries ... < 4 5 6 7 8 9 10 11 12 13 14 >