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Results 401 - 450 of 1009
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Kariya S - - 2013
To demonstrate that carbon dioxide (CO2) microbubble contrast enhancement depicts blood vessels when used for x-ray examinations. Microbubbles were generated by cavitation of physiological saline to which CO2 gas had been added using an ejector-type microbubble generator. The input pressure values for CO2 gas and physiological saline that produced a ...
Mroczkowska Stephanie - - 2012
OBJECTIVE To compare and contrast the presence of ocular and systemic vascular function in patients with newly diagnosed and previously untreated primary open-angle glaucoma (POAG) vs those with normal-tension glaucoma (NTG) and comparable early-stage, functional loss. METHODS The systemic vascular function of 19 patients with POAG, 19 patients with NTG, ...
Rehberg Sebastian S Investigational Intensive Care Unit, Department of Anesthesiology, The University of Texas Medical Branch, Galveston, TX, USA. - - 2012
Vasopressin analogs are used as a supplement to norepinephrine in septic shock. The isolated effects of vasopressin agonists on sepsis-induced vascular dysfunction, however, remain controversial. Because V(2)-receptor stimulation induces vasodilation and procoagulant effects, a higher V(1a)- versus V(2)-receptor selectivity might be advantageous. We therefore hypothesized that a sole, titrated infusion ...
Eechoute K - - 2012
Hypertension is an important side effect of sunitinib treatment. In a retrospective study in 255 patients, single-nucleotide polymorphisms (SNPs) in vascular endothelial growth factor A (VEGFA), vascular endothelial growth factor receptor (VEGFR)-2, endothelin-1 (ET-1), and endothelium-derived nitric oxide synthase (eNOS) were multivariately tested against hypertension grades and changes in systolic ...
Kaess Bernhard M BM National Heart, Lung, and Blood Institute's Framingham Heart Study, Framingham, Massachusetts, - - 2012
Vascular stiffness increases with advancing age and is a major risk factor for age-related morbidity and mortality. Vascular stiffness and blood pressure pulsatility are related; however, temporal relationships between vascular stiffening and blood pressure elevation have not been fully delineated. To examine temporal relationships among vascular stiffness, central hemodynamics, microvascular ...
Figueiredo Carlos G - - 2012
We describe a technique that prevents the Argentinean flag sign in white cataract. The technique is based on the intumescent cataract having 2 rather than 1 pressurized compartments within the crystalline lens, the anterior and the posterior. The pressure that pushes the nucleus upward, which is the movement responsible for ...
McCurley Amy - - 2012
Hypertension is a cardiovascular risk factor present in over two-thirds of people over age 60 in North America; elevated blood pressure correlates with increased risk of heart attack, stroke and progression to heart and kidney failure. Current therapies are insufficient to control blood pressure in almost half of these patients. ...
Litterio Maria C - - 2012
Epidemiological and intervention studies have shown that the intake of certain chocolates or cocoa products decreases blood pressure (BP) in humans. (-)-Epicatechin is the most abundant flavanol present in cocoa seeds and its derived foods. This work investigates the effects of dietary (-)-epicatechin on BP in rats that received N(ω)-nitro-l-arginine ...
Schnadt Joachim - - 2012
The new instrument for near-ambient-pressure X-ray photoelectron spectroscopy which has been installed at the MAX II ring of the Swedish synchrotron radiation facility MAX IV Laboratory in Lund is presented. The new instrument, which is based on a SPECS PHOIBOS 150 NAP analyser, is the first to feature the use ...
Gustafsson T - - 2013
The wall stiffness of arteries and arterioles adapts to the long-term demands imposed by local intravascular pressure. We investigated whether substances capable of inducing acute and long-term effects on arterial wall stiffness are released locally into the bloodstream in response to an acute marked increase in local intravascular pressure in ...
Chandrasekaran V - - 2012
Smartphones today have become increasingly popular with the general public for their diverse functionalities such as navigation, social networking, and multimedia facilities. These phones are equipped with high end processors, high resolution cameras, and built-in sensors such as accelerometer, orientationsensor and light-sensor. According to comScore survey, 26.2% of US adults ...
Eskesen Kristian - - 2012
Objectives- Invasive measurements of intracardiac hemodynamics in animal models have allowed important advances in the understanding of cardiac disease. Currently they are performed either through a carotid arteriotomy or via a thoracotomy and apical insertion. Both of these techniques have disadvantages and are not conducive to repeated measurements. Therefore, the ...
Larson Abigail - - 2012
Quercetin (Q) reduces blood pressure (BP) in hypertensive individuals, but the mechanism is unknown. We hypothesized that acute Q aglycone administration reduces BP in hypertensive men by decreasing angiotensin-converting enzyme (ACE) activity and/or by lowering the ratio of circulating endothelin-1 (ET-1) to nitric oxide and that these alterations will improve ...
Santulli Gaetano - - 2012
The expression of calcium/calmodulin-dependent kinase IV (CaMKIV) was hitherto thought to be confined to the nervous system. However, a recent genome-wide analysis indicated an association between hypertension and a single-nucleotide polymorphism (rs10491334) of the human CaMKIV gene (CaMK4), which suggests a role for this kinase in the regulation of vascular ...
Sakka Samir G - - 2012
The transpulmonary thermodilution technique (TPTD) is a safe, multi-parametric advanced cardiopulmonary monitoring technique that provides important parameters required for making decisions in critically ill patients. The TPTD provides more reliable indicators of preload than filling pressures, the unique measurement of extravascular lung water (EVLW) and comparable accuracy in measuring cardiac ...
Bogni Serge - - 2012
Complete closure of gastrotomy is the linchpin of safe natural orifice transgastric endoscopic surgery. To evaluate feasibility and efficacy of a new method of gastrotomy closure by using a sutureless laser tissue-soldering (LTS) technique in an ex vivo porcine stomach. In vitro experiment. Experimental laboratory. Histological analysis and internal and ...
Bolzan Douglas Willian - - 2012
BACKGROUND: Despite numerous studies on endotracheal tube cuff pressure (CP) management, the literature has yet to establish a technique capable of adequately filling the cuff with an appropriate volume of air by while generating low CP in a less subjective way. The purpose of this prospective study was to evaluate ...
Bielska K - - 2012
We present a laser absorption technique to measure the saturation vapour pressure of hexagonal ice. This method is referenced to the triple-point state of water and uses frequency-stabilized cavity ring-down spectroscopy to probe four rotation-vibration transitions of at wavenumbers near 7180 cm(-1). Laser measurements are made at the output of a ...
da Silva R C V - - 2012
The treatment of gastroesophageal reflux disease may be clinical or surgical. The clinical consists basically of the use of drugs; however, there are new techniques to complement this treatment, osteopathic intervention in the diaphragmatic muscle is one these. The objective of the study is to compare pressure values in the ...
Mogi Satoshi - - 2012
Coronary perforation is a rare but serious complication of percutaneous coronary intervention. In our case, kissing balloon technique caused the perforation. We took care of balloon diameter and inflation pressure, but we did not consider that the proximal lumen could take elliptical rather than circular shape. Then perforation occurred at ...
Smyth Tamara - - 2012
In this work, a technique is presented for estimating the reed pulse from the pressure signal recorded at the bell of a clarinet during performance. The reed pulse is a term given to the typically periodic sequence of bore input pressure pulses, a signal related to the volume flow through ...
Owens Robert L RL Sleep Disorders Research Program, Division of Sleep Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA. - - 2012
The passive pharyngeal critical closing pressure (Pcrit) is measured using a series of pressure drops. However, pressure drops also lower end-expiratory lung volume (EELV), which independently affects Pcrit. We describe a technique to measure Pcrit at a constant EELV. Continuous positive airway pressure (CPAP)-treated obstructive sleep apnea (OSA) patients and ...
Schmölzer Georg M - - 2012
RATIONALE: Endotracheal tube (ETT) malposition is common and an increasing number of non-invasive techniques to aid rapid identification of tube position are available. Electrical impedance tomography (EIT) is advocated as a tool to monitor ventilation. OBJECTIVE: This study aimed to compare EIT with five other non-invasive techniques for identifying ETT ...
Seo Dongjin - - 2012
We describe a gas-density gauge based on the analysis of the thermally-driven fluctuations of an atomic force microscope (AFM) cantilever. The fluctuations are modeled as a ring-down of a simple harmonic oscillator, which allows fitting of the resonance frequency and damping of the cantilever, which in turn yields the gas ...
Halberg Franz - - 2012
To detect vascular variability anomalies (VVAs), a blood pressure and heart rate profile around the clock for at least 7 days is a start. As a minimum, measurement every 60 or preferably 30 minutes for a week is needed, to be continued if abnormality is found, to assess the about ...
Guirro Ursula Bueno do Prado UB Clinical Surgery, Universidade Federal do Paraná (UFPR), Curitiba, Paraná, Brazil. - - 2012
The induction of the general anesthesia in patients on "a full stomach" can result in regurgitation of the gastric content and pulmonary aspiration. The function of the rapid sequence induction (RSI) is to minimize the time interval between the loss of the airway protection reflexes and tracheal intubation tube balloon. ...
Janda M - - 2012
The life-threatening effects of intracranial hypertension on brain perfusion and cerebral metabolism are the subject of current research in different animal models. The purpose of this study was to describe an efficient, reliable and inexpensive surgical method for temporary elevation of intracranial pressure (ICP) in acutely instrumented pigs in a ...
Dave Jaydev K - - 2012
Subharmonic-aided pressure estimation (SHAPE) is a technique that utilizes the subharmonic emissions, occurring at half the insonation frequency, from ultrasound contrast agents to estimate ambient pressures. The purpose of this work was to compare the performance of different processing techniques for the raw radiofrequency (rf) data acquired for SHAPE. A ...
Roman Sabine - - 2012
Anatomic changes induced by large hiatal hernia may alter esophageal pressure topography measurements made during high-resolution manometry. Retrospective study. Single-institution tertiary hospital. Ninety patients with large (>5 cm) hiatal hernias on endoscopy were compared with a control group of 46 patients without hernia selected from the same database of 2000 ...
Ostrander Roger V RV - - 2012
BACKGROUND: Studies suggest that arthroscopic repair techniques may have high recurrence rates for larger rotator cuff tears. A more anatomic repair may improve the success rate when performing arthroscopic rotator cuff repair. We hypothesized that a triple-row modification of the suture-bridge technique for rotator cuff repair would result in significantly ...
Goldstein Carly M - - 2012
Meditation techniques are increasingly popular practices that may be useful in preventing or reducing elevated blood pressure. We reviewed landmark studies and recent literature concerning the use of meditation for reducing blood pressure in pre-hypertensive and hypertensive individuals. We sought to highlight underlying assumptions, identify strengths and weaknesses of the ...
Raboel P H - - 2012
Monitoring of intracranial pressure (ICP) has been used for decades in the fields of neurosurgery and neurology. There are multiple techniques: invasive as well as noninvasive. This paper aims to provide an overview of the advantages and disadvantages of the most common and well-known methods as well as assess whether ...
Julien Cécile A - - 2012
Baroreflex is involved in the regulation of arterial blood pressure (BP). An increase in BP activates vagal inhibitory pathways to decrease heart rate; a concomitant decrease in sympathetic discharge reduces vascular resistance. Both responses reduce BP towards normal value. Conversely, a decrease in BP produces opposite effects to increase heart ...
Kusche-Vihrog Kristina - - 2012
Excessive amounts of salt in food, as usually consumed worldwide, affect the vascular system, leading to high blood pressure and premature disabilities. Salt entering the vascular bed after a salty meal is transiently bound to the endothelial glycocalyx, a negatively charged biopolymer lining the inner surface of the blood vessels. ...
Dias Eros da Mota Eda - - 2012
The role of hypertension in the loss of cognitive function is controversial. Relationships between hypertension and increases in cerebral vascular resistance, diffused lesions and multiple lacunar infarcts of the white matter are well known. Thus, the objectives of this study were: to evaluate the relationship between hypertension and cognitive dysfunction ...
Drummond Heather A - - 2012
Pressure-induced constriction (also known as the "myogenic response") is an important mechano-dependent response in certain blood vessels. The response is mediated by vascular smooth muscle cells (VSMCs) and characterized by a pressure-induced vasoconstriction in small arteries and arterioles in the cerebral, mesenteric, cardiac, and renal beds. The myogenic response has ...
Zhang Guanqun G Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, USA. - - 2012
There is a profound need for early and convenient detection of hemorrhage in both civilian and military medicine. Due to wave reflection timing, central pulse pressure (PP), but not peripheral PP, is a surrogate of stroke volume (SV) and therefore an early marker of blood loss. However, only peripheral PP ...
He Xi-Ju - - 2011
OBJECTIVES: To obtain the morphological and biomechanical remodeling of portal veins in swine with portal hypertension (PHT), so as to provide some mechanical references and theoretical basis for clinical practice about PHT. METHODS: Twenty white pigs were used in this study, 14 of them were subjected to both carbon tetrachloride- ...
Reiling Erwin - - 2012
p53 is involved in stress response, metabolism and cardiovascular functioning. The C-allele of rs1042522 in the gene encoding for p53 is associated with longevity and cancer. In this study, we aimed to investigate the association of rs1042522 with changes in blood pressure, BMI and waist circumference using a longitudinal approach. ...
Parsa Afshin A Division of Nephrology, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA. - - 2012
Elevated serum levels of uric acid consistently correlate with hypertension, but the directionality of the association remains debated. To help define this relationship, we used a controlled setting within a homogeneous Amish community and the Mendelian randomization of a nonsynonymous coding single-nucleotide polymorphism, rs16890979 (Val253Ile), in the SLC2A9 gene. This ...
Rotemberg V - - 2012
Increased hepatic venous pressure can be observed in patients with advanced liver disease and congestive heart failure. This elevated portal pressure also leads to variation in acoustic radiation-force-derived shear wave-based liver stiffness estimates. These changes in stiffness metrics with hepatic interstitial pressure may confound stiffness-based predictions of liver fibrosis stage. ...
Abramson Evan H - - 2011
A rolling-sphere technique has been used to measure shear viscosities of (supercritical) fluid methane in a diamond-anvil cell between temperatures of 294 and 673 K, up to a pressure of 6 GPa. A correlation between a reduced viscosity and reduced residual entropy is shown to give a good account of ...
Vasdev Sudesh - - 2011
Hypertension is a major health problem worldwide. Individuals with hypertension are at an increased risk for stroke, heart disease, and kidney failure. Although the etiology of essential hypertension has a genetic component, lifestyle factors such as diet play an important role. Insulin resistance is a common feature of hypertension in ...
Singer Michael A - - 2011
Evolution represents a natural experimental process for testing animal design features. Driven by environmental pressures, animals have evolved adaptations which can give valuable insights into human biomedical conditions. The giraffe by virtue of its extremely long neck has a mean arterial pressure much higher than other mammals. However, the giraffe ...
Williams Jonathan S JS Division of Endocrinology, Diabetes, and Hypertension, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, - - 2011
A loss-of-function cytosine (C) for thymidine (T) transition at nucleotide 8590 of CYP4A11 has been associated with increased blood pressure in humans. We tested the hypothesis that CYP4A11 T8590C genotype is associated with salt sensitivity in the International Hypertensive Pathotype cohort. CYP4A11 T8590C genotype was associated with hypertension in whites. ...
Lin Dexin - - 2011
Current large animal models that could closely resemble the typical features of cirrhotic portal hypertension in human have not been well established. Thus, we aimed to develop and describe a reliable and reproducible canine cirrhosis model of portal hypertension. A total of 30 mongrel dogs were randomly divided into four ...
Li Jun J The Postdoctoral Workstation, General Surgery Center of PLA, General Hospital of Chengdu Military Command, Chengdu 610083, Sichuan Province, - - 2011
To observe the hepatic injury induced by carbon dioxide pneumoperitoneum (CDP) in rabbits, compare the effects of low- and high-pressure pneumoperitoneum, and to determine the degree of hepatic injury induced by these two clinically relevant CDP pressures. Thirty healthy male New Zealand rabbits weighing 3.0 to 3.5 kg were randomly ...
Nzietchueng Rosine - - 2011
BACKGROUND AND AIMS: Genome-wide linkage analysis studies reported the importance of the long arm of chromosome 13 in systolic blood pressure regulation. Therefore, isolating a genetic variant related to this chromosomal region could be challenging. Klotho KL-VS allele is located on this chromosomal region and its relationships with cardio-vascular risk ...
Rhaleb Nour-Eddine - - 2011
Autocrine, paracrine, endocrine, and neuroendocrine hormonal systems help regulate cardio-vascular and renal function. Any change in the balance among these systems may result in hypertension and target organ damage, whether the cause is genetic, environmental or a combination of the two. Endocrine and neuroendocrine vasopressor hormones such as the renin-angiotensin ...
Reginato Rosane - - 2011
This study was designed to determine whether infants generate sufficient inspiratory pressure gradient to open the unidirectional valve of various commercially available holding chambers, as well as the time required to reach this gradient. A prospective, cross-sectional study was performed of 80 healthy infants (aged 1-24 months) seen in the ...
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