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Wong Heong-Ieng - - 2010
Nutcracker syndrome occurs when the left renal vein (LRV) is compressed between the superior mesenteric artery and the aorta, and this syndrome is often characterized by venous hypertension and related pathologies. However, invasive studies such as phlebography and measuring the reno-caval pressure gradient should be performed to identify venous hypertension. ...
Polaschegg Hans-Dietrich - - 2010
The historical development of the use of pressure sensors as protective system against blood loss to the environment is reviewed. In spite of early warnings about the deficiency of such sensors, the venous pressure sensor is still formally accepted as protective system against blood loss to the environment in case ...
Di Nardo M - - 2010
Although significant steps have been taken to monitor complex hemodynamics in neonatal and pediatric intensive care units, cardiovascular function in neonates is still evaluated by measuring blood pressure, heart rate, diuresis, central venous pressure (if a central venous catheter was placed), capillary refill time and oxygen saturation measurement in the ...
Wuethrich Patrick Yves - - 2010
The case of a 38-year old man with recurrent adenocarcinoma of the right lung and infiltration of the thoracic wall, who underwent a right pneumonectomy with thoracic wall resection, is described. Dissection of the right pulmonary hilous was extremely difficult due to the previous operations. The superior vena cava (SVC) ...
Chao Chia Sheng - - 2010
Iatrogenic injury is a difficult situation for a surgeon. Being successful in saving a patient at risk is the major concern in this situation. Once an iatrogenic injury to the superior vena cava (SVC) is found, increasing the intrathoracic pressure is theoretically able to overcome the venous pressure and to ...
Lakhal Karim - - 2010
PURPOSE: Passive leg raising (PLR) is a maneuver performed to test the cardiac Frank-Starling mechanism. We assessed the influence of PLR-induced changes in preload on the performance of PLR-induced change in pulse pressure (Delta(PLR)PP) and cardiac output (Delta(PLR)CO) for fluid responsiveness prediction. METHODS: Sedated, nonarrhythmic patients with persistent shock were ...
Martinez Ricky R Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, - - 2010
Venous tortuosity is associated with multiple disease states and is often thought to be a consequence of venous hypertension and chronic venous disease. However, the underlying mechanisms of vein tortuosity are unclear. We hypothesized that increased pressure causes vein buckling that leads to a tortuous appearance. The specific aim of ...
Chung Chih-Ping - - 2010
It has been demonstrated that internal jugular vein (IJV) compression aggravates headache intensity in patients of migraine. We hypothesized that patients with migraine may have veins that are less distensible; consequently, these veins are more likely to develop and transmit venous hypertension caused by the increased venous blood volume during ...
Latham Heath E - - 2010
Early goal directed therapy improves survival in patients with septic shock. Central venous pressure (CVP) monitoring is essential to guide adequate resuscitation. Use of peripherally inserted central catheters (PICC) is increasing, but little data exists comparing a PICC to a conventional CVP catheter. We studied the accuracy of a novel ...
Calotă F - - 2010
The valvular segment is a distinct venous structure, which, from a morphological point of view, is comprised of the following components: the valvular insertion, the valvular gorge entrance orifice, the valvular defile, the valvular gorge exit orifice, the valvular sinus. Endoscopic and echo Doppler examinations are used to identify the ...
Smit Jeroen M - - 2010
During deep inferior epigastric artery perforator (DIEP) flap dissection, we noted that in many cases the superficial vein on the ipsilateral side of the flap was engorged and tense, and in others, it was empty. This led us to believe that the pressure is increased as the result of preferential ...
Amirak Emre E Section of Molecular Medicine, National Heart and Lung Institute, Imperial College London, Sir Alexander Fleming Building, South Kensington Campus, London SW7 2AZ, - - 2010
Vascular smooth muscle cell (VSMC) proliferation remains a major cause of veno-arterial graft failure. We hypothesised that exposure of venous SMCs to arterial pressure would increase KLF5 expression and that of cell cycle genes. Porcine jugular veins were perfused at arterial or venous pressure in the absence of growth factors. ...
Wardhan Richa - - 2009
PURPOSE OF REVIEW: The focus of intraoperative monitoring is moving away from invasive monitoring. This has been attributed to procedure time, cost, and the known risks, which include carotid artery puncture, arrhythmia, pneumothorax, and infection. Until recently, the venous system's contribution to the circulatory system has been incorrectly identified as ...
Krishnan Usha S US Department of Pediatric Cardiology, New York Medical College, Valhalla, NY 10595, USA. - - 2009
The Fontan circulation is critically dependent on elevated venous pressures to sustain effective venous return. We hypothesized that chronically increased systemic venous pressures lead to adaptive changes in regional and peripheral vessels to maintain cardiac output, especially when patients are upright. Nine post-Fontan procedure patients (aged 13 to 24 years) ...
Grissom Colin K - - 2009
OBJECTIVE: To correlate physical examination findings, central venous pressure, fluid output, and central venous oxygen saturation with pulmonary artery catheter parameters. DESIGN: Retrospective study. SETTING: Data from the multicenter Fluid and Catheter Treatment Trial of the National Institutes of Health Acute Respiratory Distress Syndrome Network. PATIENTS: Five hundred thirteen patients ...
Mitchell Matthew D - - 2009
This paper is a report of a review to assess clinical studies comparing the effectiveness of different means of maintaining central venous catheter patency. Flushing with heparin is a routine part of central venous catheter maintenance, but it presents risks, including heparin-induced thrombocytopenia. Other techniques used to prevent occlusion of ...
Trzebicki J - - 2009
To ensure appropriate function of the transplanted organ, it is necessary to adequately maintain vascular volume during the kidney transplantation procedure. For this purpose, central venous pressure (CVP) is monitored through a catheter inserted into the superior vena cava (SVC). Central venous cannulation is associated with a risk of serious ...
Macha Douglas B - - 2009
PURPOSE: To evaluate a widely used nontunneled triple-lumen central venous catheter in order to determine whether the largest of the three lumina (16 gauge) can tolerate high flow rates, such as those required for computed tomographic angiography. MATERIALS AND METHODS: Forty-two catheters were tested in vitro, including 10 new and ...
Hsieh Teng-Kuei - - 2009
We describe a case of the sudden onset of cardiovascular collapse during emergence from anesthesia resulting from a massive venous air embolism, which was detected by transesophageal echocardiography. We present this case to remind anesthesiologists to be aware of the risk of a sudden return of air trapped in the ...
Grissom Colin K - - 2009
OBJECTIVE:: To correlate physical examination findings, central venous pressure (central venous pressure), fluid output, and central venous oxygen saturation with pulmonary artery catheter parameters. DESIGN:: Retrospective study. SETTING:: Data from the multicenter Fluid and Catheter Treatment Trial of the National Institutes of Health Acute Respiratory Distress Syndrome Network (National Institutes ...
Thalhammer Christoph - - 2009
AIM OF THE STUDY: Information on central venous pressure (CVP) is helpful in clinical situations like cardiac failure and sepsis. Compression ultrasound (CU) of a forearm vein has been shown to be a reliable method for CVP measurement when assessed by experienced personal under study conditions. To test the hypothesis, ...
Kulkarni Venugopal - - 2009
Patients undergoing bi-directional Glenn shunt for various congenital anomalies of the heart will have their superior vena cava (SVC) clamped during the procedure. The duration of the procedure is variable, ranging from five to 30 minutes. This can affect the cerebral perfusion due to raised venous pressure [Cerebral blood flow ...
Keller A Scott - - 2009
BACKGROUND: Early goal-directed therapy for severe sepsis or septic shock improves outcomes but requires placement of a central venous catheter to measure central venous pressure (CVP), which may delay timely resuscitation and cause catheter-related complications. In addition, nonintensivists may not start early aggressive fluid resuscitation because of difficulty estimating CVP ...
Nagdev Arun D - - 2010
STUDY OBJECTIVE: Among adult emergency department (ED) patients undergoing central venous catheterization, we determine whether a greater than or equal to 50% decrease in inferior vena cava diameter is associated with a central venous pressure of less than 8 mm Hg. METHODS: Adult patients undergoing central venous catheterization were enrolled ...
Patel Tanmay R - - 2009
OBJECTIVE: Hirayama disease is a nonprogressive cervical myelopathy associated with epidural venous engorgement and spinal canal narrowing. It has been unclear whether dural venous pressure influences spinal cord injury in this illness. CLINICAL PRESENTATION: An 18-year-old man presented with profound hand weakness and atrophy that had developed over a period ...
Cohen Paul G - - 2009
Prostatic enlargement occurs over the course of a lifetime and is associated with many risk factors. Recent observations demonstrate that valvular damage, occurring in the internal spermatic veins results in increased hydrostatic pressures that lead to venous backflow. Two consequences of venous backflow are the prolonged exposure to hydrostatic pressure ...
Palardy Maryse - - 2009
BACKGROUND: Dynamic mitral regurgitation (MR) contributes to decompensation in chronic dilated heart failure. Reduction of MR was the primary physiological end point in the ESCAPE trial, which compared acute therapy guided by jugular venous pressure, edema, and weight (CLIN) with therapy guided additionally by pulmonary artery catheters (PAC) toward pulmonary ...
Wittels Bernard - - 2009
A 25-yr-old obese parturient with mild asthma underwent an uneventful spinal anesthetic for primary cesarean delivery. Within 4 h after delivery, the patient twice developed acute shortness of breath, inspiratory stridor, and hypoxemia that required intubation. A battery of blood tests revealed no evidence of an allergic reaction. She had ...
Krabbendam Ineke - - 2009
OBJECTIVE: Formerly preeclamptic women with low plasma volume are at increased risk of recurrent gestational hypertensive disease. We hypothesized that a 4-week cycling training in formerly preeclamptic women improves (venous) hemodynamic function. METHODS: In 9 formerly preeclamptic women, we examined physical fitness and hemodynamic function, before and after the training. ...
Smirk C - - 2009
OBJECTIVE: To examine pressure changes in neonatal percutaneous central venous catheters under varying laboratory conditions and to quantify the risks of rupture in clinical practice. DESIGN: We tested 27-gauge polyurethane Premicath and 24-gauge silicone ECC (both Vygon, Norristown, PA) catheters. Burst pressures were determined by applying a slowly ramped pressure ...
Kottenberg-Assenmacher Eva - - 2009
BACKGROUND: Calculation of systemic vascular resistance, used for hemodynamic decision-making, is based on central venous pressure taken as the downstream pressure. However, during circulatory arrest, arterial pressure decreases to a plateau higher than central venous pressure, the critical closing pressure (Pcrit). The authors assessed in humans undergoing arrest whether two-compartment ...
Islam M Tajul - - 2009
The open heart surgery like coronary artery bypass graft (CABG), repair of ventricular septal defect (VSD) and atrial septal defect (ASD), valve replacement need a circulatory arrest, which is normally safe under conventional hypothermia. During this time not only the heart and lungs are bypassed but also a wide range ...
Sankoff Jeffrey - - 2008
This study describes a means of assessing the external jugular venous pressure (JVP) as an indicator of normal or elevated central venous pressure (CVP). Intensive care unit patients having CVP monitoring were examined. With patients in bed, the external jugular vein (EJV) was occluded at the base of the neck ...
Choi Seong Wook - - 2008
During the use of pulsatile extracorporeal life support (pulsatile-ECLS), the patient's venous pressure near the inlet venous catheter tip must be monitored to maintain sufficient blood flow and to prevent vein collapse. However, direct measurement of the venous pressure and the estimate of suction using measured blood inflow and prepump ...
Yazigi A - - 2008
BACKGROUND: The rationale for using central venous oxygen saturation (ScvO(2)) in various clinical scenarios is that it reflects the balance between oxygen delivery (DO(2)) and demands. In this study, we evaluated the correlation between ScvO(2) and DO(2) changes (Delta Do(2), DeltaScvO(2)) in patients receiving fluid therapy following coronary surgery. We ...
Haouzi Philippe - - 2009
More than 70 years ago, Harrison and his group proposed that in the absence of pulmonary edema, an increased systemic venous pressure could be a major source of dyspnea upon exertion in cardiac patients. Harrison provided evidence that in resting animals systemic venous pressure can affect ventilatory control through afferent ...
Schummer Wolfram - - 2008
STUDY OBJECTIVE: To evaluate a new disposable syringe (Certofix PresSure Check [B Braun Melsungen AG, Melsungen, Germany]) that serves as a manometer. DESIGN: Prospective study. SETTING: University hospital's cardiac surgery suite. PATIENTS: 21 consecutive patients with continuous invasive monitoring of central venous and arterial pressures during cardiothoracic surgery. INTERVENTIONS AND ...
Madhavan Guruprasad - - 2008
OBJECTIVE: To evaluate the contributing roles of venous status, microvascular filtration, and calf muscle pump activity in the etiology of delayed orthostatic hypotension (OH). DESIGN: Unblinded within-subjects trial. SETTING: Academic clinical research center. PARTICIPANTS: Convenience sample of healthy adult women (N=30) with an age range of 30 to 65 years. ...
Memtsoudis Stavros G - - 2008
STUDY DESIGN: Prospective clinical observational study. OBJECTIVE: To evaluate the correlation and agreement between peripherally and centrally transduced venous pressures in prone spine surgery patients. SUMMARY OF BACKGROUND DATA: In view of a variety of potential complications associated with the placement of central venous lines for the purpose of central ...
von Segesser Ludwig K - - 2008
OBJECTIVES: Assess the benefit of temporary caval stenting for remote venous drainage during cardiopulmonary bypass (CPB). METHODS: Temporary caval stenting was realized in bovine experiments (65+/-6 kg) by the means of self-expanding (18F for insertion, 36F in situ) venous cannulas (Smartcanula LLC, Lausanne, Switzerland) with various lengths: 43 cm, 53 ...
Cordtz Joakim - - 2008
Intradialytic hypotension (IDH) is one of the most important short-term complications to hemodialysis (HD). Inadequate cardiac filling due to a reduction in the central blood volume is believed to be a major etiological factor. The aim of this study was to evaluate whether these pathophysiologic events are reflected in the ...
Gard Graham - - 2009
The aim of this study is to present a rational coherent hypothesis to explain the palpable involuntary movements of the cranium. The arterial and venous anatomy inside and around the skull and spinal column presents a complete vascular system with the capacity to regulate intra-cranial pressure to a level of ...
Behrendt Florian F - - 2009
The purpose of this study was to evaluate the influence of different peripheral vein catheter sizes on the injection pressure, flow rate, injection duration, and intravascular contrast enhancement. A flow phantom with a low-pressure venous compartment and a high-pressure arterial compartment simulating physiological circulation parameters was used. High-iodine-concentration contrast medium ...
Molnár A A - - 2008
AIM: In young, post-thrombotic patients, venous distensibility is decreased not only in the affected lower limb, but also in the contralateral limb and in the jugular vein when compared to age-matched control subjects. In the present study, we investigated venous wall mechanical properties in young, asymptomatic thrombophilic patients. METHODS: Eleven ...
Cui Sen - - 2008
Anaphylactic shock is a sudden, life-threatening allergic reaction associated with severe hypotension. The increased venous resistance accounts for the anaphylactic hypotension in anesthetized dogs. However, the change in peripheral vascular resistances during anaphylactic hypotension in other animals such as rats is not known. We measured the mean circulatory filling pressure ...
Larabee Todd M - - 2008
BACKGROUND: The incidence of pulseless electrical activity (PEA) as a presenting rhythm during cardiac arrest is increasing. The current animal models of PEA arrest, post-countershock or total asphyxiation, unreliably generate PEA for a specific time period. Neither of these models predictably generate pseudo-PEA. The purpose of this study was to ...
Raffetto Joseph D JD VA Boston Healthcare System, West Roxbury, Mass, - - 2008
Increased venous hydrostatic pressure plays a role in the pathogenesis of varicose veins. Increased expression of matrix metalloproteinases (MMPs) has been identified in varicose veins. Also, we have shown that MMP-2 inhibits venous contraction. However, the relation between venous pressure, MMP expression, and venous dysfunction is unclear. The purpose of ...
Yamamoto Yusuke - - 2009
A major drawback of the DIEP flap is the compromised venous drainage in the distal area, which is the rationale behind the creation of additional venous anastomoses for better flap survival. Although venous congestion is defined as an increase in the venous pressure, the effect of vascular augmentation on the ...
Sandblom Erik - - 2008
The venous haemodynamic response to enforced exercise and acute temperature increase was examined in the Antarctic fish Pagothenia borchgrevinki (borch) to enable comparisons with the existing literature for temperate species, and investigate if the unusual cardiovascular response to temperature changes previously observed in the borch can be linked to an ...
Momoo Takayuki - - 2008
Jugular phlebectasia, a dilatation of the jugular veins, is a relatively rare benign condition. Although the precise etiology is unknown, an increase in intrathoracic pressure that is transmitted to the jugular vein is believed to cause the venous ectasia. However, in this case of a 70-year-old woman with right internal ...
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