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Marik Paul E - - 2013
: Despite a previous meta-analysis that concluded that central venous pressure should not be used to make clinical decisions regarding fluid management, central venous pressure continues to be recommended for this purpose. : To perform an updated meta-analysis incorporating recent studies that investigated indices predictive of fluid responsiveness. A priori ...
Randsoe Thomas - - 2013
Bubble formation during altitude exposures, causing altitude decompression sickness (aDCS), has been referred to in theoretical models as venous gas embolisms (VGE). This has also been demonstrated by intravascular gas formation. Previous reports indicate that the formation of VGE and aDCS incidence increase abruptly for exposures exceeding 40-44 kPa ambient ...
Dutta Abhaya - - 2013
Capsaicin is used to evoke pulmonary C reflexes and produces complex pressure responses along with apnea/tachypnea, and bradycardia. In the present study, the mechanisms involved in capsaicin-induced pressure responses were explored. Tracheal, jugular venous, and femoral artery cannulations were performed in anesthetized adult rats. Blood pressure, respiratory excursions, and electrocardiogram ...
Ohmae Eiji - - 2013
Hydrostatic pressure analysis is an ideal approach for studying protein dynamics and hydration. The development of full ocean depth submersibles and high-pressure biological techniques allows us to investigate enzymes from deep-sea organisms at the molecular level. The aim of this review was to overview the thermodynamic and functional characteristics of ...
Ducrocq N - - 2013
In the current management of critically ill patients, variables such as blood pressure, urine output or central venous pressure guide resuscitative efforts. Unfortunately, global tissue hypoxia may persist leading to multiple organ failure and death. To address tissue well-being, indices such as central venous oxygen saturation (ScvO2) and lactataemia are ...
Paulo Michele - - 2013
Despite the importance of the venous system in the regulation of blood pressure, there are few studies that evaluate venous function in health and disease, and the effects of drugs on venous function. Blood pressure depends directly on the peripheral resistance and cardiac output. Unlike the peripheral resistance, in which ...
García María Eugenia García - - 2013
Episodes of loss of consciousness are common, even in young, healthy people, and can sometimes represent a diagnostic challenge. The main diagnoses to consider are syncope and epileptic seizures, both of which may have similar symptomatology such as dizziness, loss of consciousness, falls, or "convulsive" phenomena. We present the case ...
Morgan William H - - 2013
The translaminar pressure gradient (TLPG) is largely influenced by the difference between intraocular pressure (IOP) and cerebrospinal fluid pressure (CSFP), but modulated by the buffering effect of orbital tissue and pia mater, which limits the reduction in retrolaminar tissue pressure as intracranial CSFP falls below 0 mm Hg. Across the ...
Yu Zhihong - - 2013
The aim of this study was to explore the mechanism of domestic beta-aescin treating chronic venous insufficiency through observing its actions on the isolated canine saphenous venous tension, venous pressure, venous return and lymphatic return. The isolated canine spiral saphenous venous tension test was performed to detect the activity of ...
Vasdev Sumit S Department of Cardiac Anaesthesia, All India Institute of Medical Sciences, New Delhi, - - 2013
To compare external and internal jugular venous pressures to monitor pulmonary artery pressure during the Fontan procedure. During the Fontan procedure, the internal jugular vein is used to assess pulmonary artery pressure. The risk of venous thrombosis in the low-pressure Fontan circuit may compromise the long-term success of cavopulmonary anastomosis. ...
Cui Jian J Pennsylvania State University College of Medicine, Penn State Hershey Heart and Vascular Institute, Milton S. Hershey Medical Center, Hershey, PA 17033, - - 2013
Classic canine studies suggest that central great vein distension evokes an autonomic reflex tachycardia (Bainbridge reflex). It is unclear whether central venous distension in humans is a necessary and sufficient stimulus to evoke a reflex increase in heart rate (HR), blood pressure (BP), and muscle sympathetic nerve activity (MSNA). Prior ...
Calzada J - - 2013
Penicillium roqueforti plays an important role in the ripening of blue-veined cheeses, mostly due to lactic acid consumption and to its extracellular enzymes. The strong activity of P. roqueforti proteinases may bring about cheese over-ripening. Also, free amino acids at high concentrations serve as substrates for biogenic amine formation. Both ...
Reverter Enric - - 2013
BACKGROUND & AIMS: Measurement of the hepatic venous pressure gradient (HVPG) offers valuable prognostic information in patients with cirrhosis. In specific circumstances, (children, agitated patients, TIPS placement) deep sedation is required. This study aims to assess the impact of deep sedation on the accuracy of hepatic/portal pressure measurements. METHODS: Forty-four ...
Koster M - - 2013
OBJECTIVES: Venous pressure measurement using an intravenous catheter is the sole method for the diagnosis of venous hypertension in patients with chronic venous insufficiency. A noninvasive tool to quantify increased venous pressure is essential for studying venous pathophysiology. Aim of the study was to investigate the value of controlled compression ...
Mosti G - - 2013
OBJECTIVE/BACKGROUND: Treatment for leg oedema conventionally starts with compression bandaging followed by elastic stockings once swelling is reduced. The aim was to investigate if a kit consisting of a liner and outer stocking, each exerting 20 mmHg of pressure, would be equally effective in achieving and maintaining volume reduction compared with ...
Aboud Anas - - 2013
OBJECTIVES: Miniaturized cardiopulmonary bypass (MCPB) is increasingly used in cardiac surgery, because it can lower clinically significant complications such as systemic inflammatory response, haemolysis and high transfusion requirements. A limitation of MCPB is the risk of excessive negative pressure in the venous line during volume depletion, probably leading to gaseous ...
Bartek Jiri J - - 2013
We report a patient with intracranial hemorrhage secondary to venous hypertension as a result of a giant aortic pseudoaneurysm that compressed the superior vena cava and caused obstruction of the venous return from the brain. To our knowledge, this is the first patient reported to have an intracranial hemorrhage secondary ...
Cecconi Maurizio - - 2013
PURPOSE: The difference between mean systemic filling (Pmsf) and central venous pressure (CVP) is the venous return gradient (dVR). The aim of this study is to assess the significance of the Pmsf analogue (Pmsa) and the dVR during a fluid challenge. METHODS: We performed a prospective observational study in postsurgical ...
Iblher Peter - - 2013
Long-haul flights (LHF) are known to be connected with an increased risk of deep vein thrombosis. There is still some lack of clarity about the impact of hypoxia and lower levels of air pressure and humidity on passengers during flight. This cross-over study researched interstitial fluid shifts traced by measurements ...
Benigni Jean-Patrick - - 2013
Although medical compression stockings (MCSs) represent the cornerstone of conservative treatment for patients with chronic venous disease, high rates of noncompliance exist. This study compared comfort levels and the difficulty associated with putting on/removing two different MCSs; a conventional degressive MCS (ankle pressure: 24-28 mmHg; calf pressure: 14-18 mmHg) and ...
Georgakarakos Efstratios I - - 2013
<b>Purpose: </b>To investigate<b> </b>the factors influencing the hydrostatic pressure exerted within the venous aneurysms (VA) of an arteriovenous fistula (AVF). <b>Methods:</b> Ideal models of a side-to-end brachial-cephalic AVF were computationally constructed and typical values for the length and the local diameters were considered for both the artery and vein sections ...
Debreczeni B - - 2013
We aimed to test two hypotheses: 1) isolated small veins develop substantial myogenic tone in response to elevation of intraluminal pressure, 2) H2O2 contributes to the mediation of myogenic response via activation of arachidonic acid (AA) cascade and release constrictor prostaglandins. METHODS: Small veins were isolated from gracilis muscle of ...
Kwon Mi-Young - - 2013
BACKGROUND:The effects of maneuvers to increase intrathoracic pressure and of Trendelenburg position on the cross-sectional area (CSA) of the subclavian vein (SCV) and the relationship between the SCV and adjacent structures have not been investigated.METHODS:In ultrasonography-guided SCV catheterization (N = 30), the CSA of the SCV and the distance between ...
Lim Chang-Sup - - 2013
BACKGROUND: Recently, various hemostatic devices, such as metal or plastic clips, ultrasonic coagulating shears, and electrothermal bipolar vessel sealer, have been widely applied during an operation. The purpose of this study was to analyze the mechanical, histological, and biochemical differences of vessels sealed with various hemostatic devices. METHODS: Thirty New ...
Recek Cestmir C (Retired from) Division of Vascular Surgery, Department of Surgery, Faculty Hospital, Charles University, Hradec Kralove, Czech - - 2013
Calf muscle pump is the motive force enhancing return of venous blood from the lower extremity to the heart. It causes displacement of venous blood in both vertical and horizontal directions, generates ambulatory pressure gradient between thigh and lower leg veins, and bidirectional streaming within calf perforators. Ambulatory pressure gradient ...
Simons Antoine P - - 2013
Next to severely decreased pump flow, hypovolemia in extracorporeal life support (ELS) can result in subatmospheric venous line pressure. Such pressure may lead to degassing and resultant gaseous microemboli (GME), with potential changes in neurological clinical outcome. CME activity resulting from degassing was investigated in relation to subatmospheric venous line ...
Lattimer Christopher R - - 2013
BACKGROUND: Graduated elastic compression (GEC) stockings have been demonstrated to reduce the morbidity associated with post-thrombotic syndrome. The ideal length or compression strength required to achieve this is speculative and related to physician preference and patient compliance. The aim of this study was to evaluate the hemodynamic performance of four ...
Ran Hai-Tao - - 2013
Objectives To prospectively assess changes in spleen stiffness and splenoportal venous flow before and after transjugular intrahepatic portosystemic shunt (TIPS) placement. Methods We prospectively evaluated spleen stiffness measured by the mean shear wave velocity with acoustic radiation force impulse imaging and the splenoportal venous velocity with color Doppler sonography in ...
Lai Jonathan - - 2013
Objective: To investigate the potential value of measuring mean arterial pressure (MAP), systolic (sBP) and diastolic (dBP) blood pressure at 30-33 weeks' gestation in the prediction of preeclampsia (PE) developing at or after 34 weeks. Methods: Screening study in singleton pregnancies at 30-33 weeks' gestation including 4,294 that were unaffected ...
Prekker Matthew E - - 2013
OBJECTIVE:: To determine the most accurate predictor of central venous pressure among three point-of-care venous ultrasound techniques. DESIGN:: Cross-sectional study. SETTING:: Medical ICU in an academic medical center. PATIENTS:: Convenience sample of 67 spontaneously breathing patients who had an intrathoracic central venous catheter to allow measurement of central venous pressure. ...
Kosmidou Ioanna - - 2013
Cryoballoon ablation (CBA) is an established therapy for atrial fibrillation (AF). Pulmonary vein (PV) occlusion is essential for achieving antral contact and PV isolation and is typically assessed by contrast injection. We present a novel method of direct pressure monitoring for assessment of PV occlusion. Transcatheter pressure is monitored during ...
Blaber Andrew P - - 2013
The goal of this study was to investigate the contribution of splanchnic volume redistribution and lower limb vasoconstriction in the maintenance of blood pressure during progressive central hypovolemia induced by graded lower body negative pressure (LBNP). It was hypothesized that splanchnic blood volume loss during LBNP would buffer decreases in ...
Zahir Muhammed - - 2013
Isolated giant varicocele has been reported with portal hypertension that results in abnormal communication between portal venous system and testicular vein venous system resulting in retrograde backflow of blood into the testicular venous system which leads to varicosity of the pampiniform plexuses. 65-year-old male with no past medical or surgical ...
Beggs Clive B - - 2013
Venous abnormalities contribute to the pathophysiology of several neurological conditions. This paper reviews the literature regarding venous abnormalities in multiple sclerosis (MS), leukoaraiosis, and normal-pressure hydrocephalus (NPH). The review is supplemented with hydrodynamic analysis to assess the effects on cerebrospinal fluid (CSF) dynamics and cerebral blood flow (CBF) of venous ...
Ajlan Abdulrazag M - - 2013
Spontaneous intracranial hypotension (SIH) is a syndrome of low pressure headache associated with low CSF pressure. The condition is generally considered benign but extreme cases of SIH can lead to changes in the level of consciousness. We describe a case in which alteration in the level of consciousness was prolonged ...
Zöllei Eva E Department of Anaesthesiology and Intensive Therapy, University of Szeged, Semmelweis u, 6, Szeged 6725, Hungary. - - 2013
In the assessment of hypovolemia the value of functional hemodynamic monitoring during spontaneous breathing is debated. The aim of our study was to investigate in spontaneously breathing subjects the changes in hemodynamic parameters during graded central hypovolemia and to test whether slow patterned breathing improved the discriminative value of stroke ...
Strohmaier Clemens A CA Department of Ophthalmology, University of Texas Health Science Center at San Antonio, San Antonio, - - 2013
Histological evidence suggests a role for the central nervous system in controlling episcleral venous pressure (EVP). Based on prior studies that identified candidate regions in the brain stem, the present study assessed the effect of electrical stimulation at the location of the superior salivatory nucleus (SSN) on EVP in rats. ...
Abdel-Sayed Saad - - 2012
A new plastic self-expanding Smartcanula (Smartcanula LLC, Lausanne, Switzerland) is designed for central insertion and prevention of caval collapse. The objective of our work is to assess the influence of the new design on atrial chatter. Caval collapse over the entire caval axis, right atrial, hepatic, renal vein, and iliac ...
F Gnanaraj Joseph - - 2012
Worsening renal function (WRF) during the treatment of acute decompensated heart failure (ADHF) occurs in up to a third of patients and is associated with worse survival. Venous congestion is increasingly being recognized as a key player associated with WRF in ADHF. Understanding the hemodynamic effects of venous congestion and ...
Wakerley Benjamin - - 2012
In many intracranial disease states, monitoring of intracranial pressure (ICP) is essential to evaluate response to the therapeutic measures as well as estimation of prognosis. Although, direct estimation of ICP is reliable, it is invasive and not possible in all patients. Transcranial Doppler (TCD) ultrasonography is a bedside and noninvasive ...
Tonnelier Alexandre - - 2012
BACKGROUND: Different filtering devices are used during mechanical ventilation to avoid dysfunction of flow and pressure transducers or for airborne micro7organisms containment. Water condensates resulting from the use of humidifiers, but also residual nebulization particles, may have a major influence on expiratory limb resistances. OBJECTIVES: To evaluate the influence of ...
Wang Zhiguo - - 2012
To study the anaphylaxis of Qingkailing injection (QI) and its components. Experimental anaphylactoid and allergic reactions were used. Changes in the behaviors of Beagles and serum levels of histamine, immunoglobulin (Ig)E, IgG, IgM, eosinophil cationic protein (ECP), and interleukin (IL)-4, as well as blood pressure, after injecting QI and its ...
Araos Joaquin D - - 2012
Objective-To evaluate the use of the oxygen content-based index, Fshunt, as an indicator of venous admixture ([Formula: see text]s/[Formula: see text]t) at various fractions of inspired oxygen (Fio(2)s) in anesthetized sheep undergoing Flung or 2-lung ventilation. Animals-6 healthy adult female sheep. Procedures-Sheep were anesthetized and administered 5 different Fio(2)s (0.21, ...
Persichini Romain - - 2012
Norepinephrine exerts venoconstriction that could increase both the mean systemic pressure and the resistance to venous return, but this has not yet been investigated in human septic shock. We examined the relative importance of both effects and the resulting effect on venous return when decreasing the dose of norepinephrine. Intensive ...
Schuren Jan J 3M Skin and Wound Care Division, Neuss, Germany - - 2012
Chronic venous insufficiency can lead to recalcitrant leg ulcers. Compression has been shown to be effective in healing these ulcers, but most products are difficult to apply and uncomfortable for patients, leading to inconsistent/ineffective clinical application and poor compliance. In addition, compression presents risks for patients with an ankle-brachial pressure ...
Dwyer Christopher M - - 2012
Object The authors examined the role of venous sinus obstruction in the etiology of idiopathic intracranial hypertension (IIH) by reviewing more than 200 MR venograms performed in suspected cases of IIH. Methods Individual MR venograms performed in cases of suspected IIH at the Children's Hospital at Westmead in Sydney, Australia, ...
Rohan C P-Y - - 2012
A patient-specific finite-element (FE) model of the human leg is developed to model the stress distribution in and around a vein wall in order to determine the biomechanical response of varicose veins to compression treatment. The aim is to investigate the relationship between the local pressure on the soft tissues ...
Caspersen C - - 2012
The purpose of this study was to assess immediate changes in the partial pressure of nitric oxide (NO) in exhaled gas (PE(NO) ) in healthy trained subjects who were acutely exposed to moderate altitude. One group of nine and another group of 20 healthy subjects were exposed to an ambient ...
Lurie F - - 2012
PurposeTo assess the variability of interface pressure and changes in this pressure over one month time interval under ready-to-use compression stockings. METHODS: Fifteen healthy volunteers with a broad range of sizes and shapes of the calves were included in final analysis. Each volunteer sequentially used six pairs of stockings daily ...
Van Canneyt K - - 2012
Although arterio-venous grafts (AVGs) are the second best option as long-term vascular access for hemodialysis, they suffer from complications caused by intimal hyperplasia, mainly located in vessel regions of low and oscillating wall shear stress. However, certain flow patterns in the bulk may reduce these unfavorable hemodynamic conditions. We therefore ...
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