Search Results
Results 201 - 250 of 518
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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 - - 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 ...
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) ...
Finnoff Jonathan T - - 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 ...
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 ...
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 ...
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 ...
Warriner David - - 2009
Chronic heart failure and hypertension are major clinical problems. This article gives an overview of some of the talks from a recent BJHM conference supported by Takeda which brought together leading experts in the field to discuss current issues, latest developments and practical management of chronic heart failure and hypertension. ...
Huang Haixia H Department of Physiology and Pathophysiology, Capital Medical University, Beijing 100069, People's Republic of - - 2009
Transient stretching of the ventricle can trigger arrhythmias and evoke ventricular fibrillation, especially when the stimulation occurs in the vulnerable period. To explore the sensitivity of small hearts we used a commercial pressure servo to study the kinetic relationship of left ventricular pressure to excitability and arrhythmias in the rat ...
Stefánsson Einar - - 2009
A variety of treatment options are available for the treatment of diabetic macular edema. They include laser photocoagulation, anti-VEGF drugs, intravitreal steroids, and vitrectomy with or without release of vitreoretinal traction. A full understanding of the physiological mechanisms of these treatment modalities allows sensible combination of treatment options. Retinal photocoagulation ...
Stevenson Lynne Warner - - 2009
Heart failure decompensation is dominated by congestive symptoms from elevated pulmonary and systemic venous pressures. In dilated heart failure, forward flow is optimal at near-normal filling pressures, with minimized mitral regurgitation. Tailored therapy to reduce filling pressures improves symptoms acutely. However, monitored reduction of filling pressures during hospitalization did not ...
Wu Jiun-Yan - - 2008
The maximum distance between the heart and a model Taser stimulation dart, called the dart-to-heart distance, at which the Taser can directly cause ventricular fibrillation (VF), was measured in pigs. A 9-mm-long blunt probe was advanced snugly through the surrounding tissues toward the heart. Five animals [pig mass=61.2+/-6.23 standard deviation ...
Kreso Amir - - 2008
The study was designed with the main intent to assess and explain the differences between athlete's heart syndrome and the heart of healthy non-athletes, and to distinguish between physiological and pathological heart condition. Prolonged athletic training causes changes in heart that are termed "athlete's heart syndrome". Athlete's heart diagnosis and ...
Abu-Issa Radwan - - 2008
In human development, it is postulated based on histological sections, that the cardiogenic mesoderm rotates 180 degrees with the pericardial cavity. This is also thought to be the case in mouse development where gene expression data suggests that the progenitors of the right ventricle and outflow tract invert their position ...
Ventura-Clapier Renée - - 2008
Although the concept of energy starvation in the failing heart was proposed decades ago, still very little is known about the origin of energetic failure. Recent advances in molecular biology have started to elucidate the transcriptional events governing mitochondrial biogenesis. In particular, a great step was taken with the discovery ...
Kraetschmer S - - 2008
OBJECTIVE: To determine if Buchanan's vertebral heart scale can be applied to beagle dogs to establish reference values for this breed and to determine the possible influence of optimal lung inflation on the cardiac measurements. METHODS: The cardiac health of 19 beagle dogs was examined by echocardiography, electrocardiogram, non-invasive blood ...
Chen Jian-Fu - - 2008
Cardiovascular disease is the leading cause of human morbidity and mortality. Dilated cardiomyopathy (DCM) is the most common form of cardiomyopathy associated with heart failure. Here, we report that cardiac-specific knockout of Dicer, a gene encoding a RNase III endonuclease essential for microRNA (miRNA) processing, leads to rapidly progressive DCM, ...
Rahko Peter S - - 2008
BACKGROUND: An electromuscular incapacitating device (EMD) delivers pulses of high-voltage electricity, causing strong muscle contraction. Data from a pig model suggest that an EMD dart tip placed within 17 mm of the epicardial surface can cause ventricular fibrillation. The current study estimates minimum skin-to-heart distance in the adult, to determine ...
Bruce Alexandra F - - 2008
AIMS: Remodelling of gap junctions, involving reduction of total gap junction quantity and down-regulation of connexin43 (Cx43), contributes to the arrhythmic substrate in congestive heart failure. However, little is known of the underlying mechanisms. Recent studies from in vitro systems suggest that the connexin-interacting protein zonula occludens-1 (ZO-1) is a ...
Schuller S - - 2007
A 7-year-old male intact Rottweiler was presented with a 1-week history of lethargy, anorexia, vomiting and multiple syncopal events. The results of the clinical examination and electrocardiography were consistent with a third degree atrioventricular block and an intermittent accelerated idioventricular rhythm. Haematology, serum biochemistry, serology for Borrelia burgdorferi, blood culture, ...
Wirkner Christian S - - 2008
Tanaidacea and Cumacea are crucial for understanding the phylogenetic relationships of "core group" peracarids. Here, the haemolymph vascular system in three tanaidacean and four cumacean species was studied on the basis of histological sections and 3D reconstruction. The circulatory organs in Tanaidacea include a tubular heart which extends through most ...
Killeen M J - - 2008
We explored the anti-arrhythmic efficacy of K(+) channel activation in the hypokalaemic murine heart using NS1643 and nicorandil, compounds which augment I(Kr) and I(KATP) respectively. Left ventricular epicardial and endocardial monophasic action potentials were compared in normokalaemic and hypokalaemic preparations in the absence and presence of NS1643 (30 microM) and ...
Nagayama Takahiro - - 2007
BACKGROUND: Cardiac myosin binding protein-C (cMyBP-C) is a thick-filament protein whose presence and phosphorylation by protein kinase A (PKA) regulates cross-bridge formation and kinetics in isolated myocardium. We tested the influence of cMyBP-C and its PKA-phosphorylation on contraction/relaxation kinetics in intact hearts and revealed its essential role in several classic ...
Pontieri Vera - - 2007
INTRODUCTION: Catuama, an herbal drug very popular in Brazil, was tested on the reversion and prevention of ventricular fibrillation (VF) in the isolated rabbit heart. MATERIALS AND METHODS: Catuama (a mixture of Trichilia catigua, Paullinia cupana, Ptychopetalum olacoides, and Zinziber officinalis) was perfused in the isolated perfused rabbit heart. Its ...
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