Search Results
Results 201 - 250 of 1290
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Magder Sheldon - - 2006
PURPOSE OF REVIEW: The proper use of central venous pressure requires a good understanding of basic measurement techniques and features of the waveform. RECENT FINDINGS: If attention is not paid to proper leveling of the transducer and consideration of transmural pressure then major errors are made in the use of ...
Hoftman Nir - - 2006
STUDY OBJECTIVE: To assess the reliability of peripheral venous pressure (PVP) as a predictor of central venous pressure (CVP) in the setting of rapidly fluctuating hemodynamics during orthotopic liver transplant surgery. DESIGN: Prospective clinical trial. SETTING: UCLA Medical Center, main operating room-liver transplant surgery. PATIENTS: Nine adult patients with liver ...
Marx Gernot - - 2006
PURPOSE OF REVIEW: Mixed venous and central venous oxygen saturations reflect the balance between oxygen requirement and oxygen delivery, and thus may be used to assess the adequacy of tissue oxygenation. This review discusses recent data on the impact of using venous oximetry by obtaining mixed venous oxygen saturation or ...
Saner F H - - 2006
BACKGROUND AND OBJECTIVES: Positive end-expiratory pressure may alter cardiac function and systemic haemodynamics. As transplanted livers may be sensitive to liver congestion, the aim of our study was to evaluate the effect of positive end-expiratory pressure on the cardiovascular system and in particular on central venous and iliac venous pressure ...
Chauveau M - - 2006
The mechanical properties of human veins remain incompletely known. However they play an important part in number of physiological and pathological situations, as hemodynamic adjustment to orthostasis, deep venous thrombosis (DVP) and chronic venous insufficiency (CVI). The aim of the study was to describe the pressure/volume (area) relationship of some ...
Yang Sungjae - - 2006
A 40-year-old woman who had primary pulmonary hypertension presented with dilated episcleral vessels, venous stasis retinopathy, and open-angle glaucoma with reflux of blood in Schlemm's canal in both eyes. Intraocular pressure was controlled with anti-glaucoma medication along with systemic treatment of congestive heart failure. However, venous stasis retinopathy progressed with ...
Schubert Armin - - 2006
Verification of appropriate precordial Doppler probe position over the anterior chest wall is crucial for early detection of venous air embolism. We studied responses to normal saline (NS) and carbon dioxide (CO2) test injections at various probe locations during elective craniotomy. All patients received four IV injections (10 mL of ...
Abbas Manzoor - - 2006
Right heart failure is associated with increased systemic venous pressure, which can be diagnosed clinically with the findings of elevated jugular venous pressure, pulsatile liver and distinctive cardiac murmurs (precordial systolic). Severe tricuspid regurgitation (TR) has occasionally been known to lead to marked pulsation of varicose veins. We report three ...
Yukio HAYASHI
In puppies weighing 500 to 1,500 grams, 50 ml./kg. saline was rapidly infused and the following results were obtaied. (1) With the use of the same amount of fluid per unit body weight, the rate of elevation of central venous pressure was higher in smaller puppies. (2) With the infusion ...
Wolf Jean-Pierre - - 2006
In the present study, the effects of L-dopa treatment on cardiovascular variables and peripheral venous tone were assessed in 13 patients with Parkinson's disease (PD) with Hoehn and Yahr stages 1-4. Patients were investigated once with their regular treatment and once after 12 h of interruption of L-dopa treatment. L-Dopa ...
Hadimioglu N - - 2006
BACKGROUND AND OBJECTIVE: Previous studies in adults have demonstrated a clinically useful correlation between central venous pressure (CVP) and peripheral venous pressure (PVP). The current study prospectively compared CVP measurements from a central versus a peripheral catheter in kidney recipients during renal transplantation. METHODS: With ethics committee approval and informed ...
Lakhal Karim - - 2006
OBJECTIVE: To study the influence on central venous pressure (CVP), measured at the distal port, of crystalloid infusions administered through the proximal port(s) of a central venous multi-lumen catheter. PATIENTS: Thirty-one intensive care patients. INTERVENTIONS: CVP was measured at the distal port of a multi-lumen catheter inserted in the subclavian ...
Jegger David - - 2006
OBJECTIVE: Transthoracic echocardiography (TTE) has been used clinically to disobstruct venous drainage cannula and to optimise placement of venous cannulae in the vena cava but it has never been used to evaluate performance capabilities. Also, little progress has been made in venous cannula design in order to optimise venous return ...
Maruyama Megumi - - 2006
We investigated the effects of heat acclimation on venous and arterial compliance in humans. Four male and four female volunteers were exposed to an ambient temperature of 40 degrees C and relative humidity of 40% for 4 h (1330-1730 hours) per day for 9-10 consecutive days. The calf venous compliance ...
Malis Leonard I - - 2006
A major concern in surgery is the prevention or control of bleeding. The ligature and the clip are the hallmarks of the last century of modern surgery. Therapeutic embolization is not really used to stop hemorrhage but to treat aneurysms and so prevent future rupture and bleeding. Blood clotting within ...
Aggarwal Vikram V Dept. of Biomed. Eng., Johns Hopkins Univ., Baltimore, MD, USA. - - 2006
Central venous pressure (CVP) is an important physiological parameter, the correct measure of which is a clinically relevant diagnostic tool for heart failure patients. A current challenge for physicians, however, is to obtain a quick and accurate measure of a patient's CVP in a manner that poses minimum discomfort. Current ...
Planken R Nils - - 2006
BACKGROUND: Preoperative assessment of forearm superficial venous diameter may predict early failure of newly created arteriovenous fistulas for haemodialysis access. However, early failure and non-maturation rates remain high (up to 30%) and reported cut-off diameters are inconsistent. We hypothesize that this inconsistency is due to differences in the methods used ...
Junghans Tido - - 2006
BACKGROUND AND AIMS: Hypovolemia after bowel preparation as well as capnoperitoneum (CP) may compromise hemodynamic function during laparoscopic colonic surgery. A fall in arterial pressure after induction of anesthesia is often answered by generous fluid administration, which might impair "fast-track" rehabilitation. Intraoperative assessment of the needed infusion volume is difficult ...
Bendjelid Karim - - 2005
According to the concept of Guyton, cardiac output is largely controlled by venous return, which is determined by the difference between mean systemic venous pressure and right atrial pressure. In the analysis of the venous return curve, other authors have suggested that right atrial pressure is the dependent variable and ...
Kolbach D N - - 2005
BACKGROUND: Accepted diagnostic criteria exist for the diagnosis of deep vein thrombosis (DVT). However, no uniform definition for the diagnosis and treatment of the post-thrombotic syndrome (PTS) exists. We examined the various definitions of PTS that are used and their relationships with invasive venous pressure measurement. METHODS: Patients who had ...
Skals Marianne - - 2005
The effects of adrenergic stimulation on mean circulatory filling pressure (MCFP), central venous pressure (P(CV)) and stroke volume (Vs), as well as the effects of altered MCFP through changes of blood volume were investigated in rattlesnakes (Crotalus durissus). MCFP is an estimate of the upstream pressure driving blood towards the ...
Ho A M-H - - 2005
Continuous central pressure monitoring and simultaneous continuous infusion via the same central venous catheter are sometimes necessary. Based on theoretical calculations and experimental measurements, we have determined that pressure monitoring is essentially unaffected if the continuous infusion rate is 50 ml.h(-1) or less for an adult and a paediatric central ...
Dix F P - - 2005
Patients with chronic venous insufficiency often have combined superficial and deep venous incompetence. The aims of this study were to determine the effects of superficial venous surgery (SVS) on deep venous haemodynamics and on ambulatory venous pressure (AVP) and to determine if the AVP tourniquet test can predict the effect ...
Bergan John J - - 2005
Chronic venous insufficiency is linked to venous hypertension and forces of shear stress on the endothelium. Venous hypertension depends upon two forces: the weight of a column of blood from the right atrium transmitted through the valveless vena cava and iliac veins to the femoral vein, and pressure generated by ...
Pascarella Luigi - - 2005
Recent histologic and immunocytochemical evidence of venous leg ulcers supports the hypothesis that lesions observed at different stages of chronic venous insufficiency may be associated with, and possibly caused by, an inflammatory process. Evidence has been obtained that venous valve deficiency may be associated with leukocyte infiltration into valve leaflets; ...
Krantz T - - 2005
BACKGROUND: Hypovolaemia may be considered to represent a volume-restricted cardiac output (CO), but CO varies inversely with the haemoglobin concentration (Hb) and a maximal mixed venous oxygen saturation (SvO2) may be a better target for volume administration than a maximal CO. METHODS: In 10 anaesthetized pigs, volume loading with 6% ...
Munns Suzanne L - - 2005
The effects of treadmill exercise on components of the cardiovascular (heart rate, mean arterial blood pressure, central venous pressure, venous return) and respiratory (minute ventilation, tidal volume, breathing frequency, rate of oxygen consumption, rate of carbon dioxide production) systems and on intra-abdominal pressure were measured in the American alligator, Alligator ...
Anderson Stephen I - - 2005
The decrease in pre-capillary resistance in the human calf during gradual cumulative increases in venous congestion pressure has been proposed to represent vasodilator signalling between the venous and arterial microcirculations. The present study investigated whether prostaglandins are involved in this local flow regulation by measuring calf blood flow and microvascular ...
Wang Jiun-Jr - - 2006
Compared with arterial hemodynamics, there has been relatively little study of venous hemodynamics. We propose that the venous system behaves just like the arterial system: waves propagate on a time-varying reservoir, the windkessel, which functions as the reverse of the arterial windkessel. During later diastole, pressure increases exponentially to approach ...
Danielsson G - - 2005
PURPOSE: To define the association between venous volume as measured with air-plethysmography and the duplex ultrasound measured diameter of incompetent perforator of the lower limb. PATIENTS AND METHODS: Thirty-six patients with chronic venous disease were investigated with air-plethysmography and duplex ultrasound. Venous volume and venous filling time was measured. Venous ...
Sahin Altan - - 2005
STUDY OBJECTIVE: Previous studies suggest a correlation of central venous pressure (CVP) with peripheral venous pressure (PVP) in different clinical setups. The aim of this study was to investigate the effect of measurement site on PVP and its agreement with CVP in patients undergoing general anesthesia. DESIGN: Prospective randomized study. ...
Létienne Robert - - 2005
The aim of the present study was to determine whether donitriptan and sumatriptan decreased jugular venous oxygen saturation and increased carbon dioxide partial pressure in venous blood. However, previous studies conducted with these compounds cannot discriminate whether the decrease of venous oxygen saturation is dependent of cranial vasoconstrictor. In the ...
Molnár Andrea Agnes - - 2006
INTRODUCTION: In situ biomechanical properties of peripheral large veins were compared between asymptomatic young patients who had previously unilateral femoro-popliteal deep venous thrombosis (DVT) and age-matched, healthy controls; the aim of this study was to assess local or generalized alterations of venous wall biomechanics in postthrombotic patients. PATIENTS AND METHODS: ...
Okazaki Kazunobu - - 2005
We dissected the relative contribution of arteriovenous hemodynamics, the venoarteriolar response (VAR), and the myogenic reflex toward a decrease in local blood flow induced by venous congestion. Skin blood flow (SkBF) was measured in 12 supine subjects via laser-Doppler flowmetry 1) over areas of forearm and calf skin, in which ...
Van Tricht Ilse - - 2005
The hemodynamics in the vascular access graft are influenced by the flow aspirated and injected through the two needles during hemodialysis. For the first time, the impact of needle flow on vascular access performance, measured in an in vitro set up, is reported. A vascular access model, consisting of a ...
Singh D V - - 2005
The intravenous (i.v.) infusion of lipopolysaccharide (LPS) of E. coli endotoxin in buffalo calves (n = 15) at 5 microg/kg bw per h for 3 h caused a significant (p<0.05) fall in plasma volume, blood volume, haematocrit haemoglobin, and systolic, diastolic and pulse pressure, mean arterial pressure and central venous ...
Cox Paul - - 2005
OBJECTIVES: The measurement of central venous pressure (CVP) is used to assess intravascular status. Although this is usually accomplished by placement of a central venous catheter (CVC), there are circumstances when placement of a CVC may be technically difficult or impossible. The current study investigates the feasibility of measuring CVP ...
Patel Rupa - - 2005
We describe the case of a 76-year-old man with a renal cell carcinoma thrombus extending into the right atrium, prolapsing across the tricuspid valve into the right ventricle during diastole, and producing sufficient portal venous pressure to result in intestinal venous thrombosis and necrosis of the upper gastrointestinal mucosa. The ...
Magder Sheldon - - 2005
PURPOSE OF REVIEW: Central venous pressure is a very common clinical measurement, but it is frequently misunderstood and misused. As with all hemodynamic measurements, it is important to understand its basic principles. RECENT FINDINGS: This analysis indicates that it is best to always consider the significance of central venous pressure ...
Kim Kyongsong - - 2005
BACKGROUND: Measurement of dural sinus or drainage vein pressure is useful for determining the appropriate treatment for some patients. We report a novel measurement procedure that reduces bleeding from the needle puncture site as well as further tearing of the wall. METHODS: The vessel is punctured through the patch by ...
Korkut A Kubilay - - 2005
The early patency of arteriovenous fistulas created for hemodialysis is affected by various factors, including venous stenosis. We conducted a study to investigate the effect of venous stenosis on early patency by examining perioperative arterial and venous pressures of the fistula. Among the 15 patients selected for the study, 11 ...
Alemohammad Mahmood M Department of Anesthesiology, Imam Khomeini Medical Center, Tehran University of Medical Sciences, Tehran, - - 2005
Although central venous pressure (CVP) is a valuable guide and measurement during cardiac surgery anesthesia, there are many occasions however, when the time consumed in inserting a peripheral catheter, defeats the actual purpose. The purpose of this study was to compare central venous pressure and internal jugular veins pressure, and ...
Sandblom Erik - - 2005
Cardiac preload (central venous pressure, P(CV), mean circulatory filling pressure (MCFP), dorsal aortic blood pressure (P(DA)) and relative cardiac output (Q) were measured in sea bass (Dicentrarchus labrax) at rest and while swimming at 1 and 2 BL s(-1). MCFP, an index of venous capacitance and the upstream venous pressure ...
Sahin Altan - - 2005
Previous studies suggest a correlation of central venous pressure (CVP) with peripheral venous pressure (PVP) in different clinical settings. The effect of body temperature on PVP and its agreement with CVP in patients under general anesthesia are investigated in this study. Fifteen American Society of Anesthesiologists I-II patients undergoing elective ...
Pilcher D V - - 2005
BACKGROUND: Poor oxygenation might occur in transplanted lungs as a result of reperfusion injury and lack of lymphatic drainage. Low central venous and pulmonary capillary wedge pressures are advocated to reduce pulmonary edema and maximize oxygenation but might adversely affect cardiac index, circulation, and renal function. METHODS: Histories, intensive care ...
Martin Elizabeth A - - 2005
We tested whether central venous pressure (CVP) changes during vasoactive drug injections used for baroreflex assessment in humans. We measured CVP during sequential intravenous boluses of nitroprusside (NTP) and phenylephrine (PHE; modified Oxford technique). NTP caused a decrease in CVP of 1.9+/-0.2 mmHg from baseline (P<0.01) and PHE caused an ...
Dhawan Vivek - - 2005
In humans, multiparity (repeated pregnancy) is associated with increased risk of cardiovascular disease. In rats, multiparity increases the pressor response to phenylephrine and to acute stress, due in part to changes in tone of the splanchnic arterial vasculature. Given that the venous system also changes during pregnancy, we studied the ...
Lin Ming-Chih - - 2005
PURPOSE: To compare the right atrial pressure to the central venous pressures measured at different points in spontaneously breathing children and try to find a formula to estimate right atrial pressure by central venous pressure measurement. METHODS: Fifty-one children, aged 5 +/- 4.7 years, who underwent right heart catheterization were ...
Sandblom E - - 2005
The baroreflex was triggered by altering branchial blood pressure with pre- and post-branchial occlusions for 30 s in rainbow trout Oncorhynchus mykiss. The cardiac limb of the baroreflex was monitored by continuous heart rate (f(H)) measurements. Responses of venous capacitance vessels were assessed, immediately following either occlusion, by measuring mean ...
Fullana J M - - 2005
To present a virtual model, the venous return simulator (VRS), designed to compute venous hemodynamic variations when compression is applied to the leg. The VRS defines a numerical network of the lower extremity and computes the dynamic variables (flow rate, venous diameter and internal pressure) for a defined external pressure. ...
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