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Results 351 - 400 of 942
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Schipke Kimberly J - - 2011
The aortic valve, located between the left ventricle and the aorta, allows for unidirectional blood flow, preventing backflow into the ventricle. Aortic valve leaflets are composed of interstitial cells suspended within an extracellular matrix (ECM) and are lined with an endothelial cell monolayer. The valve withstands a harsh, dynamic environment ...
Ellison David H DH Division of Nephrology and Hypertension, Oregon Health and Science University, Portland, Oregon 97239, USA. - - 2011
The distal convoluted tubule (DCT) plays a central role in blood pressure and potassium homeostasis, as evidenced by diseases that occur when its function is modified. The paper by van der Lubbe and colleagues makes clear that angiotensin II itself increases the activity and abundance of the thiazide-sensitive Na-Cl cotransporter ...
McGinnis Elizabeth E Leeds Teaching Hospitals NHS Trust, c/o 2nd Floor Stable Block, Old Trust HQ, Leeds General Infirmary, Great George St, Leeds, UK, LS1 - - 2011
Pressure ulcers are areas of localised damage to the skin and underlying tissue caused by pressure or shear. Pressure redistribution devices are used as part of the treatment to reduce the pressure on the ulcer. The anatomy of the heel and the susceptibility of the foot to vascular disease mean ...
Nantel Pierre - - 2010
Dysregulation of the renin-angiotensin system is implicated in many cardiovascular and renal pathologies. Discovery of the renin-angiotensin system represents a major advance in the understanding of hypertension and cardiovascular disease, leading to the development of the anti-angiotensin medications: angiotensin-converting enzyme inhibitors, angiotensin receptor blockers and direct renin inhibitors. Clinical trials ...
Jorge Jorge - - 2010
The aim of this study was to assess the influence of the position (upright vs. supine) in the intraocular pressure (IOP) measured with a non-contact portable tonometer. Fifty university students with a mean age of 22.3±4.2 years (mean±SD) were recruited to participate in this study. IOP was measured with the ...
Lan Chou-Chin - - 2010
Positional changes are thought to affect hemodynamics, respiratory mechanics, and gas exchange after pneumonectomy. The objective of this study was to compare hemodynamic and respiratory parameters and gas exchange in different positions before and after pneumonectomy. Twenty pigs were anesthetized and mechanically ventilated. Seven received right-side pneumonectomy, seven received left-side ...
Gomez Max A - - 2010
Over the past year, Toyota has come under harsh scrutiny as a result of several recalls. These well publicized mishaps have not only done damage to Toyota's otherwise sterling reputation for quality but have also called into question the assertions from a phalanx of followers that Toyota's production system (generically ...
Takada Jun-Ichi - - 2011
Although it has been suggested that an imbalance in buccolingual pressure may play a role in dental compensation of the molars and asymmetry in the mandibular dental arch in subjects with facial asymmetry, it is still unclear whether buccolingual pressure is associated with this phenomenon. Thus, the purpose of this ...
Moon Jee Y - - 2010
BACKGROUND: The hanging drop technique is used for identifying the cervical epidural space, using its negative pressure. However, it is doubtful whether the epidural space intrinsically exhibits a negative pressure. We designed this study to test the hypothesis that the cervical epidural pressure (CEP) is significantly higher in the prone ...
Jeon Young-Tae - - 2010
BACKGROUND: We investigated whether preoperative positional arterial blood pressure change predicted hypotension and ephedrine requirement during spinal anesthesia for cesarean delivery. METHODS: Arterial blood pressure was measured in 66 women undergoing cesarean delivery in the supine and the right lateral positions. Positional blood pressure change was defined as the difference ...
Hughes Samantha Jane - - 2010
Bioindicators are essential for detecting environmental degradation and for assessing the success of river restoration initiatives. River restoration projects require the identification of environmental and pressure gradients that affect the river system under study and the selection of suitable indicators to assess habitat quality before, during and after restoration. We ...
Martell María - - 2010
In liver cirrhosis, the circulatory hemodynamic alterations of portal hypertension significantly contribute to many of the clinical manifestations of the disease. In the physiopathology of this vascular alteration, mesenteric splanchnic vasodilation plays an essential role by initiating the hemodynamic process. Numerous studies performed in cirrhotic patients and animal models have ...
Guillas Serge - - 2010
We present statistical evidence for a temporal link between variations in the El Niño-Southern Oscillation (ENSO) and the occurrence of earthquakes on the East Pacific Rise (EPR). We adopt a zero-inflated Poisson regression model to represent the relationship between the number of earthquakes in the Easter microplate on the EPR ...
Mekis Dusan - - 2010
INTRODUCTION: The cardiovascular response to decreased or increased preload in high-risk patients with ischemic heart disease enables us to understand the physiologic response to hemorrhage and its treatment. Although numerous studies have failed to show its effectiveness, the head-down position is still widely used to treat patients with hypotension and ...
George Thomas - - 2010
Left ventricular hypertrophy (LVH) particularly in hypertensive patients is a strong predictor of adverse cardiovascular events. Identifying LVH not only helps in the prognostication but also in the choice of therapeutic drugs. The prevalence of LVH is age linked and has a direct correlation to the severity of hypertension. Adequate ...
Fougères Emilie - - 2010
OBJECTIVE: The hemodynamic impact of positive end-expiratory pressure in acute respiratory distress syndrome and the underlying mechanisms have not been extensively investigated during low stretch ventilation. Our aim was to evaluate the hemodynamic effect of increasing positive end-expiratory pressure when tidal volume and the plateau pressure are limited and to ...
Li Jin - - 2010
Photoplethysmography (PPG) is an optical method for detecting blood volume changes in tissue. Respiratory-induced intensity, frequency and amplitude variations are contained in the PPG signal; thus, an understanding of the relationships between all of these variations and respiration is essential to advancing respiration monitoring based on PPG. This study investigated ...
Corno Antonio F - - 2010
Fontan connection with intermittent compression by wrapped latissimus dorsi (LD) was tested in vivo, in vitro and by means of computational fluid dynamics (CFD). Experimental study: LD was conditioned in four pigs for three weeks before Fontan connection by valved conduit wrapped with LD. Mock circuit: Inflatable cuff wrapped around ...
Ros-Mar Ricardo - - 2011
This study examines, for the first time, the differences of interface pressure in different positions on a standard hospital bed and a double-regression hospital bed. For both beds, the interface pressure was recorded in four supine positions and three lateral positions in 49 healthy volunteers (30 men and 19 women). ...
Kim Joo-Han - - 2010
Heartbeat and respiration are fundamental vital signs used for estimation of patient's status. In this study, we have proposed a simple method to monitor the heartbeat and respiration based on displacements of human body which occur due to periodic heartbeat and breathing.
Cheriyan Joseph - - 2010
Hypertension (persistent diastolic blood pressure of 90 mm Hg or greater and systolic blood pressure 140 mm Hg or greater) affects 20% of the world's adult population, and increases the risk of cardiovascular disease, end-stage renal disease, and retinopathy. METHODS AND OUTCOMES: We conducted a systematic review and aimed to answer the following clinical ...
Tanaka Yoshitaka - - 2010
BACKGROUND: Thoracic outlet syndrome is thought to be caused by compression of the brachial plexus or subclavian artery in the interscalene, costoclavicular, or subcoracoid space. Some provocative tests are widely used for diagnosing thoracic outlet syndrome. However, whether provocative positions actually compress the neurovascular bundle in these spaces remains unclear. ...
Burnier Michel - - 2010
A majority of hypertensive patients need more than one antihypertensive drug to control their blood pressure. For this reason, most guidelines have introduced the possibility of prescribing fixed-dose combination therapies as first-line treatment in hypertension. Today, the concept of fixed-dose combinations has evolved and the term single pill combination might ...
Rashid Haroon-Ur - - 2010
Hypertension (HTN) is an important factor in progressive loss of renal function. The kidney can be both a contributor to and a target of HTN. The functional integrity of the kidney is vital for the maintenance of cardiovascular homeostasis. Chronic activation of the renin system causes HTN and, ultimately, end-organ ...
Machado Calixto - - 2010
Brain death (BD) should be understood as the ultimate clinical expression of a brain catastrophe characterized by a complete and irreversible neurological stoppage, recognized by irreversible coma, absent brainstem reflexes, and apnea. The most common pattern is manifested by an elevation of intracranial pressure to a point beyond the mean ...
Urban Frantisek - - 2010
This paper describes steps involved in the design and realization of a new type of pressure sensor based on the optical fiber Bragg grating. A traditional pressure sensor has very limited usage in heavy industrial environments, particularly in explosive or electromagnetically noisy environments. Utilization of optics in these environments eliminates ...
Gorman Peter H - - 2010
Outpatient clinic of a spinal cord injury rehabilitation center. Case report. A 40-year-old man with a 20-year history of C4 complete tetraplegia complained of 5 years of excessive intermittent left-sided sweating. The sweating occurred only in the seated upright position. There was no associated headache, blurred vision, or blood pressure ...
Lapalu Jordane - - 2010
Totally implanted ports (TIP) have become a standard part of patient care, providing long-term central venous access for treatment administration and other procedures. Despite overall the safety and effectiveness of TIP, complications still occur. Negative pressure created during needle withdrawal induces blood reflux and subsequent catheter occlusion. Application of positive ...
Effenberger Andrew J AJ Jr Idaho National Laboratory (INL), 1765 W. Yellowstone HWY, Idaho Falls, ID 83415-2208, USA. - - 2010
Laser-induced breakdown spectroscopy (LIBS) is typically performed at ambient Earth atmospheric conditions. However, interest in LIBS in other atmospheric conditions has increased in recent years, especially for use in space exploration (e.g., Mars and Lunar) or to improve resolution for isotopic signatures. This review focuses on what has been reported ...
Donina Zh A - - 2009
Effect of posture on the hypercapnic ventilatory response was studied on the anaesthetized rats by using rebreathing techniques in the supine and head-down positions. There were no statistically significant alterations in tidal volume, frequency, minute ventilation, and P(ET)CO(2)between the head-down and supine positions during breathing at rest. However, the esophageal ...
Gordon Susan - - 2011
What effect does body position have on cardio-respiratory variables in active older people? An experimental laboratory study was undertaken measuring heart rate, systolic and diastolic blood pressure and oxygen saturation when 26 active people aged 60 years and over adopted five standardized body positions. Measurements were taken every 2 min ...
Georgiou C - - 2010
To investigate the proposed mechanism by which intrauterine balloons achieve their tamponade effect of creating an 'intrauterine pressure that is greater than the systemic arterial pressure'. To determine the intraluminal pressures within a Bakri balloon during the establishment of a positive 'tamponade test' in the management of postpartum haemorrhage. To ...
Sagar Sam S - - 2009
This study investigated how aspects of perfectionism in athletes (N = 388) related to the fears of failure proposed by Conroy et al. (2002), and how perfectionism and fears of failure predicted positive and negative affect after imagined success and failure in sports competitions. Results showed that perfectionistic personal standards ...
Tang Clarice Y - - 2010
OBJECTIVES: To examine the effectiveness of chest physiotherapy for patients admitted to hospital with an acute exacerbation of chronic obstructive pulmonary disease (COPD). DATA SOURCE: CINAHL, MEDLINE, Embase, Cochrane, Expanded Academic Index, Clinical Evidence, PEDro, Pubmed, Web of Knowledge and Proquest were searched from the earliest available time to September ...
Paddock Natasha - - 2009
Complete inversion of the body in a seated position may occur in exceptional circumstances such as in overturned vehicles and during military maneuvers, with direct consequences on health and fatalities. However, the physiological responses to this condition have not been published previously. The purpose of this study was to compare ...
Cheatham Michael L - - 2009
OBJECTIVE: Elevated intra-abdominal pressure (IAP) is a frequent cause of morbidity and mortality among the critically ill. IAP is most commonly measured using the intravesicular or "bladder" technique. The impact of changes in body position on the accuracy of IAP measurements, such as head of bed elevation to reduce the ...
Chuckpaiwong B - - 2009
INTRODUCTION: Doing repetitive push-ups is among the most common exercise for the upper body and shoulder stabiliser muscle strength training. However, adverse effects such as neck pain, back pain, palmar pain and wrist pain have been reported. To date, to our knowledge, palmar pressure when performing push-ups has not been ...
Pimenta Eduardo - - 2009
The renin-angiotensin-aldosterone system (RAAS) is a key mediator of blood pressure (BP) and volume regulation in both normotensive and hypertensive persons. Stimulation of RAAS also contributes to hypertension-related target organ damage. The renin-angiotensinogen reaction is the first and rate-limiting step in the generation of angiotensin II (Ang II) and has ...
Brummett B H - - 2009
Positive affect was examined as a predictor of (1) cardiovascular reactivity during a sadness and an anger recall task and recovery following the protocol, (2) epinephrine (EPI) and norepinephrine (NOREPI) reactivity and level during the recall protocol, and (3) the diurnal pattern of salivary cortisol. Sample was 328 individuals. Negative ...
Russell W J - - 2009
The effect of intermittent positive airway pressure to the non-ventilated lung was assessed in 10 patients who desaturated during one-lung ventilation. Once their saturation fell below 95% they were given a slow inflation of 2 l/min of oxygen into the non-ventilated lung for two seconds. This was repeated every 10 ...
De Keulenaer B L BL Fremantle Hospital, Intensive Care, Fremantle, Western Australia (WA), Australia. - - 2009
Intra-abdominal pressure (IAP) has traditionally been measured in the supine position, however, measuring the pressure in lateral semi-recumbent position has not been studied. A single centre prospective 1-day study. 10 patients admitted for more then 24 hours who were mechanically ventilated and had an indwelling urinary catheter. Inclusion criteria included ...
Morishita Yuichiro - - 2009
STUDY DESIGN: The clinical relationship between the local pressure of the intervertebral foramen and the clinical findings in lumbar spinal canal stenosis were evaluated. OBJECTIVE: To investigate the pathogenesis of neurogenic intermittent claudication in lumbar spinal canal stenosis. SUMMARY OF BACKGROUND DATA: The genesis of neurogenic intermittent claudication is generally ...
De Keulenaer B L - - 2009
PURPOSE: To describe what is defined as normal intra-abdominal pressure (IAP) and how body positioning, body mass index (BMI) and positive end-expiratory pressure (PEEP) affect IAP monitoring. METHODS: A review of different databases was made (Pubmed, MEDLINE (January 1966-June 2007) and EMBASE.com (January 1966-June 2007)) using the search terms of ...
Tempelhof Michael W - - 2009
This report describes an elderly patient evaluated for generalized fatigue, dyspnea, presyncopal episodes, and positional hypoxemia. Workup revealed posturally related oxygen desaturation, a patent foramen ovale (PFO), an atrial septal aneurysm, and primary adrenal insufficiency. Normal intracardiac pressures and a right-to-left PFO shunt were present only while the patient was ...
Topouzis Fotis - - 2009
The role of vascular risk factors in glaucoma is increasingly being supported by the literature, with the association between low ocular perfusion pressure (PP) and glaucoma being the most consistent result. However, we need to be cautious when interpreting these results and consider all possible confounders in the observed associations. ...
Ekmark Elaine McGarr - - 2009
The purpose of this article is to provide an overview of skin issues in children with spina bifida. Included in the discussion below is a review of the etiology of pressure ulcers and the updated 2007 pressure ulcer definition and pressure ulcer staging system as defined by the National Pressure ...
Kato Koji - - 2009
The RTX respirator is a biphasic external cuirass-style ventilator that supports both inspiration and expiration at various cycle rates and pressures, as well as allowing application of the vibration and cough modes. With this respirator, the duration and pressure can be altered in both the inspiratory and expiratory phases, and ...
Strauss Gregory P - - 2009
Previous research demonstrates that the attentional system is capable of redirecting focus to threatening information under periods of pressure. This bias may enable specific action tendencies capable of initiating thoughts and actions that promote adaptive life functions. However, relatively little is known about whether the attentional system is biased to ...
Carpes Felipe Pivetta - - 2009
OBJECTIVE: There is a common belief that seat pressure during cycling can compress specific neurovascular tissues over the perineum leading to genital pathologies. This topic has seldom been discussed for women. The present study was conducted to verify the effect of trunk position and saddle design on saddle pressure in ...
Fogelberg Donald - - 2009
Individuals with spinal cord injury (SCI) use wheelchairs for mobility and for full participation in their daily activities. The use of wheelchairs, however, can increase the risk of pressure ulcers. This study focused on wheelchair users' perceptions of the interplay between their wheeled mobility and the development of pressure ulcers ...
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