Search Results
Results 201 - 250 of 535
< 1 2 3 4 5 6 7 8 9 10 >
Schmidt Hendrik - - 2011
Previous biphasic finite element studies investigated the temporal response of a spinal segment under rather simplified loading conditions with no attention to unloading and recovery phases. Employment of existing constitutive relations in porous media yields rather large suction-type pore pressures in the disc as the load suddenly disappears. Such negative ...
Bariteau Jason T - - 2011
While intracompartmental pressure monitoring is a widely used diagnostic tool to measure intracompartmental pressures in the setting of compartment syndrome, its invasive nature has prompted the development of noninvasive techniques, such as near-infrared spectrometry. We prospectively assessed the association between tissue oxygen saturation measured by near-infrared spectrometry and compartment pressure ...
Rasdi A R - - 2011
The aim of this study was to determine the prevalence of hypertensive retinopathy, features of hypertensive retinopathy and visual outcome in hypertensive disorders in pregnancy in Hospital Universiti Sains Malaysia, Kelantan, Malaysia. A prospective observational hospital based study involving 154 patients (308 eyes) with hypertensive disorders in pregnancy was conducted. ...
Kim Namkeun - - 2011
Of the two pathways through which we hear, air conduction (AC) and bone conduction (BC), the fundamental mechanisms of the BC pathway remain poorly understood, despite their clinical significance. A finite element model of a human middle ear and cochlea was developed to gain insight into the mechanisms of BC ...
Holmer Christoph - - 2011
PURPOSE: In recent years, vessel sealing has become a well-established method in surgical practice for sealing and transecting vessels. Since this technology depends on the fusion of collagen fibers abundantly present in the intestinal wall, it should also be possible to create intestinal anastomoses by thermofusion. Bipolar radiofrequency-induced thermofusion of ...
Boyd Nathan H - - 2011
Objective. Tragal pumping is the practice of pushing on the tragus to raise pressure in the external auditory canal. This is a study to determine if tragal pumping improves middle ear penetration of ototopical medications via a patent pressure equalization tube. Study Design. Prospective, randomized controlled trial. Setting. Tertiary referral ...
Buser Zorica - - 2011
STRUCTURED ABSTRACT: Study Design: Surgically-denucleated porcine intervertebral discs (IVD) were injected with BIOSTAT BIOLOGX® Fibrin Sealant (FS), and the in vivo effects were assessed over time by histological, biochemical and mechanical criteria.Objectives: The objectives were to test whether the intradiscal injection of FS stimulates disc healing.Summary of background data: Disc ...
Bacani C Joseph - - 2011
BACKGROUND: Measurement of intracranial pressure (ICP) is recommended in comatose acute liver failure (ALF) patients due to risk of rapid global cerebral edema. External ventricular drains (EVD) can be placed to drain cerebrospinal fluid and monitor ICP simultaneously although this remains controversial in the neurosurgical community given the risk of ...
Koreckij Jason - - 2011
Study Design. Prospective, two way complete block design analyzing facial contact pressures during prone positioning with the use of cervical traction for spinal surgery. Level 2 evidence.Objective. To assess the effect of varying traction angle and traction weight to limit facial contact pressure.Summary of Background Data. Posterior spine surgery has ...
Moerman Annelies - - 2011
Purpose: To describe a simple, noninvasive technique to detect changes in oxygen saturation at the level of the spinal cord and to suggest its suitability for individualized blood pressure management during and after thoracoabdominal aneurysm repair. Case Report: A 53-year-old man with a history of multiple arch and thoracic aortic ...
Arksornnukit Mansuang - - 2011
Pressure transmission and distribution under denture bases may be variable depending on the different materials and cuspal angulations of denture teeth. The purpose of this study was to evaluate pressure transmission and distribution under impact load using denture teeth made with different materials and cuspal angulations. Three types (acrylic resin, ...
Keefe Douglas H DH Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA. - - 2011
An insert ear-canal probe including sound source and microphone can deliver a calibrated sound power level to the ear. The aural power absorbed is proportional to the product of mean-squared forward pressure, ear-canal area, and absorbance, in which the sound field is represented using forward (reverse) waves traveling toward (away ...
Bunton Kate K Department of Speech, Language, and Hearing Sciences, University of Arizona, Tucson, Arizona, USA. - - 2011
Clinical evaluation of velopharyngeal function relies heavily on auditory perceptual judgments that can be supported by instrumental examination of the velopharyngeal valve. Many of the current instrumental techniques are difficult to interpret, expensive, and/or unavailable to clinicians. Proposed in this report is a minimally invasive and inexpensive approach to evaluating ...
Poh Seng-Yew - - 2011
The anterior intermeniscal ligament (AIML) is an anatomically distinct structure that connects the anterior horns of the medial and lateral menisci. We hypothesized that both menisci work together as a unit in converting axial joint loading into circumferential hoop stresses, due to intermeniscal attachments. Therefore, loss of the AIML could ...
Carreau Aude - - 2011
Oxygen supply and diffusion into tissues are necessary for survival. The oxygen partial pressure (PO(2) ), which is a key component of the physiological state of an organ, results from the balance between oxygen delivery and its consumption. In mammals, oxygen is transported by red blood cells circulating in a ...
Alper Cuneyt M - - 2011
OBJECTIVES/HYPOTHESIS:: Determine the role of mastoid volume in middle ear pressure (MEP) regulation. The hypothesis was that inert gas exchange between blood and middle ear (ME) is slower for larger mastoid volumes. STUDY DESIGN:: Prospective. METHODS:: For 21 enrolled subjects, the bilateral surface areas and volumes of the mastoid and ...
Alper Cuneyt M CM Division of Pediatric Otolaryngology, Children's Hospital of Pittsburgh of UPMC, Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15224, USA. - - 2011
Determine the role of mastoid volume in middle ear pressure (MEP) regulation. The hypothesis was that inert gas exchange between blood and middle ear (ME) is slower for larger mastoid volumes. Prospective. For 21 enrolled subjects, the bilateral surface areas and volumes of the mastoid and tympanum were measured from ...
Jaumard Nicolas V - - 2011
ABSTRACT: Study Design: A novel non-invasive approach to measure facet joint pressure in the cervical spine was investigated using a tip-mounted transducer that can be inserted through a hole in the bony lateral mass. This technique is advantageous because it does not require resection of the joint capsule, but there ...
Hidir Yusuf - - 2011
OBJECTIVE: To compare success rates of middle ear inflation device (Ear Popper ©), Valsalva maneuver and Toynbee maneuver in middle ear pressure equalization in healthy adults. MATERIALS AND METHODS: Adult volunteers with otoscopically healthy ears were enrolled to the study. In a prospective setting, 60 ears of 35 volunteers were ...
Gu K B - - 2011
Articular cartilages and menisci are generally considered to be elastic in the published human knee models, and thus the fluid-flow dependent response of the knee has not been explored using finite element analysis. In the present study, the fluid pressure and site-specific collagen fiber orientation in the cartilages and menisci ...
Harris Joshua D - - 2011
Osteochondral autograft transfer is an accepted treatment for chondral and osteochondral defects of the knee. Synthetic plugs may eventually be used for primary treatment of defects. Currently they are largely used for osteochondral donor site backfill. Placement of osteochondral or synthetic plugs proud leads to articulating surface incongruity, increases in ...
Tanaka Yoshitaka - - 2011
Bone-to-tendon contact in the origin of the common extensor tendons is considered to be one of the causes of lateral epicondylitis. Some factors, including elbow and forearm position, varus stress to the elbow, or contraction of the wrist extensor tendons, are considered to affect this bone-to-tendon contact. However, no studies ...
Di Fazio Domizia - - 2011
The influence of the forces exerted by the perioral musculature on the position of the teeth has been the object of many scientific studies. Of the forces from the soft tissues, those from the tissues in the passive resting state are believed to be more important than forces exerted on ...
Salud Lawrence H - - 2011
We have developed a way to measure performance during a camera-guided rigid bronchoscopy using manikin-based simulation. In an effort to measure contact pressures within the airway during a rigid bronchoscopy, we instrumented pressure sensors in a commercially available bronchoscopy task trainer. Participants were divided into two groups based on self-reported ...
Maclean Julia - - 2011
Objective. The incidence of self-reported dysphagia following a laryngectomy is high (72%). The impact, if any, of a surgical closure technique on swallowing biomechanics and dysphagia severity is not known. To date, there is no recommended standard procedure for pharyngeal reconstruction during laryngectomy surgery. The aim of this study was ...
Liu Xinxin - - 2011
The purpose of the present study was to compare the physiological responses to different types of mental stress encountered in the workplace. Circulatory and central nervous system responses were examined in 8 healthy males by exposing them to 20-min of white noise (80 dB(A)) and 20-min of computer-based mental arithmetic ...
Wilson David F - - 2011
Oxygen dependent quenching of phosphorescence has been used to measure the oxygen pressure in both the vasculature of the microcirculation and the interstitial spaces of resting muscle tissue. Oxygen sensitive molecules were either dissolved in the blood (intravascular space) or micro-injected into the interstitial space and the distributions, histograms, of ...
Wolfe Ralph S - - 2011
Basic techniques for the cultivation of methanogenic archaea in anoxic media, where the O/R potential is maintained below (-) 330mV under a pressurized atmosphere of 20% carbon dioxide, are described.
Wang Tao - - 2011
: Setup computational fluid dynamics (CFD) model of the nasal cavity in patients with Crouzon syndrome analyze inspiratory airflow hydrokinetics of its nasal cavity. After changing the morphosis structure of the nasal cavity by operation, compare the preoperative and postoperative alteration of the airflow field of the nasal cavity and ...
Hausman Dorothy B - - 2011
Associations between body mass index (BMI) and dietary patterns and health conditions were explored in a population-based multiethnic sample of centenarians from northern Georgia. BMI ≤20 and ≥25 was prevalent in 30.9% and 25.3% of study participants, respectively. In a series of logistic regression analyses controlled for gender and place ...
Estrada Rosendo R Department of Bioengineering, Speed School of Engineering, University of Louisville, Louisville, KY, USA. - - 2011
Atherosclerotic lesions form non-randomly at locations in bends and bifurcations where the local flow can be classified as 'disturbed flow' and is associated with low shear stress oscillatory or reciprocating flow. Endothelial cells in vivo are constantly exposed to mechanical stimulation due to hemodynamic loading in the form of pulsatile ...
Shilo Malka - - 2010
Pressure ulcers (PU) are localised damage to skin and underlying tissues, caused by sustained tissue deformations and ischaemia. PU typically appear in insensitive or immobile patients, e.g. those with spinal cord injury (SCI) or geriatric patients. As these patients often experience fluctuations in blood pressure, and are also exposed to ...
Perez-Barcena Jon - - 2010
OBJECTIVES:: To determine the evolution of cytokine patterns using microdialysis in patients with traumatic brain injury with diffuse lesions and to study the relationship between cytokines and intracranial pressure, brain tissue oxygenation and lesion type on the computed cranial tomography scan (patients with and without brain swelling). DESIGN:: Prospective and ...
Trojnarska Olga - - 2011
Patients after successful repair of coarctation of aorta (CoAo) are at risk of hypertension at rest and associated end-organ damage. The aim of the study was to assess arterial stiffness and function in adults after coarctation repair in relation to descending aorta (AoD) residual coarctation and patient's age at operation. ...
Goodwin C Rory - - 2011
Sacral neoplasm resection is managed via partial or total sacrectomy that is performed via the Kraske approach. The combination of the patients positioning and the relatively long operative time required for this procedure increase the risk of pressure ulcers. Facial pressure ulcers can cause tissue necrosis and/or ulceration in a ...
McCarty William J - - 2011
The hydraulic resistance R across osteochondral tissue, especially articular cartilage, decreases with degeneration and erosion. Clinically useful measures to quantify and diagnose the extent of cartilage degeneration and efficacy of repair strategies, especially with regard to pressure maintenance, are still developing. The hypothesis of this study was that hydraulic resistance ...
Sun Lu - - 2010
A linear relation between stiffness and aspiration pressure is the basis for biomembrane force probe (BFP), a widely used technique to measure minuscule forces. Here we perform finite element simulations and semi-analytical modeling of the BFP operation to show that, at low aspiration pressures, there exists a characteristic regime in ...
Wang Yuan-Yuan - - 2010
Despite normal indices of left ventricular (LV) chamber function, impaired diastolic and systolic function are thought to coexist in hypertensive patients. The aim of this study was to investigate the effects of short-term manidipine therapy on LV global function in Chinese patients with hypertension using the tissue Doppler imaging (TDI) ...
Green James - - 2010
Excessive intramedullary pressure coincident to surgical procedures requiring entrance and surgical manipulation within the intramedullary canal is a problem that was recognized by Gerhard Küntscher, the godfather of intramedullary nailing. He expressed concern about this phenomenon in his early writings during the 1940's. Although he suggested certain technical methods to ...
Wu L - - 2010
To report the immediate changes of intraocular (IOP) pressure after an intravitreal injection of 2.5mg (0.1 ml) of bevacizumab. Prospective, non-controlled, interventional case series of 45 patients undergoing intravitreal injection of 2.5mg (0.1 mL) of bevacizumab for a variety of retinal disorders. IOP was measured with a Goldmann tonometer at ...
Finnoff Jonathan T JT Department of Physical Medicine and Rehabilitation, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA. - - 2010
Foot compartment syndrome is diagnosed with intracompartmental pressure measurements. The purpose of this study was to determine the ability of two techniques to accurately place a needle tip within the medial foot compartment and to compare the proximity of the needle tip to the medial foot compartment neurovascular structures between ...
Chow Ava K - - 2010
Matrix metalloproteinases (MMPs) are known to degrade components of the extracellular matrix. More recently, in myocardial oxidative stress injury including ischemia-reperfusion, MMP-2 is activated and degrades troponin I and α-actinin. MMP activity is regulated at several levels. We recently showed that MMP-2 is localized in the caveolae of cardiomyocytes and ...
Goldfarb Jillian L - - 2010
Despite the relatively small atomic fraction of a given heteroatom in a binary mixture of polycyclic aromatic compounds (PAC), the inclusion of heteroatomic substituted compounds can significantly impact mixture vapor pressure behavior over a wide range of temperatures. The vapor pressures of several binary PAC mixtures containing various heteroatoms show ...
Alexander Matthew D MD Matthew D Alexander, Department of Diagnostic Imaging, Santa Clara Valley Medical Center, San Jose, CA 95128, United - - 2010
Cerebral arteriovenous malformations (AVMs) have abnormally enlarged arteries and veins prone to spontaneous hemorrhage. Immediately following surgical excision of a cerebral AVM, even normal brain tissue surrounding the lesion is subject to hemorrhage, a phenomenon termed normal perfusion pressure breakthrough (NPPB) syndrome. According to this theory, arteries supplying cerebral AVMs ...
Penitenti Renata de Martin RD Hospital Geral de Itapecerica da - - 2010
Direct cuff pressure to the tracheal wall can cause damage. This paper aimed to verify the effectiveness of nursing team training on cuff pressure control. A retrospective survey was initially made on the records of cuff pressure measurements from January 2007 to June 2008 and the inadequacy percent was verified. ...
Gartner Gabriel E A - - 2010
The cardiovascular system of all animals is affected by gravitational pressure gradients, the intensity of which varies according to organismic features, behavior, and habitat occupied. A previous nonphylogenetic analysis of heart position in snakes-which often assume vertical postures-found the heart located 15%-25% of total body length from the head in ...
Steele Catriona M - - 2010
Tongue-pressure resistance training is known to increase tongue strength in seniors and individuals with stroke-related dysphagia. However, evidence of associated functional improvements in swallowing is equivocal. We investigated similarities in pressure waveform profiles between swallowing and several tongue-palate pressure tasks to identify tasks that may be best suited for inclusion ...
Ruderman Sarah - - 2010
Noninvasive optical techniques for tissue characterization, in particular, light scattering properties and blood supply quantification of mucosa, is useful in a wide variety of applications. However, fiber-optic probes that require contact with the tissue surface can present a challenging problem in the variability of in vivo measurements due the nature ...
Biolo Andr??ia - - 2009
Elevated filling pressures are associated with heart failure deterioration, but mechanisms underlying this association remain poorly understood. We sought to investigate whether or not elevated filling pressures are associated with increased collagen turnover, evaluated by procollagen type III aminoterminal peptide (PIIINP) levels, in stable systolic heart failure. Eighty patients with ...
Natanzon Alex - - 2009
Transudative pleural and pericardial effusions are not uncommon in patients with congestive heart failure. Pericardial effusion forms only with elevation of the right-sided filling pressure in the heart. In patients with biventricular failure, there is no evidence that elevated left-sided pressure, in the absence of elevated right-sided pressure, can cause ...
< 1 2 3 4 5 6 7 8 9 10 >