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Results 251 - 300 of 1275
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Takase S - - 2004
OBJECTIVES: To identify possible mechanisms for destruction of valves in chronic venous hypertension and the results of treatment with an anti-inflammatory micronized purified flavonoid fraction. MATERIAL AND METHODS: The saphenous vein valves in a rat model of venous hypertension caused by a femoral arterial-venous fistula were studied. Studies included femoral ...
Tabrizchi Reza - - 2004
Some analogues of arginine vasopressin (AVP) reportedly possess hypotensive properties, and two such peptides are Cys(1)-Tyr(2)-Phe(3)-Val(4)-Asn(5)-Cys(6)-Pro(7)- d-Arg(8)-Gly(9)-NH(2) (VD-AVP) and d(CH(2))(5)-Cys(1)- d-Tyr(Et)(2)-Arg(3)-Val(4)-Asn(5)-Cys(6)-Lys(7)-Lys(8)-ethylenediamine(9) (TA-LVP). In the present investigation we examined the effects of TA-LVP (0.3, 1.0 and 3.0 microg/kg/min), VD-AVP (0.3, 1.0 and 3.0 microg/kg/min) and AVP (1.0, 3.0, 10 ng/kg/min) on ...
Valenza Franco - - 2005
OBJECTIVE: To investigate whether negative extra-abdominal pressure (NEXAP) improves respiratory function and induces a blood shift from the intrathoracic compartment and to assess whether these effects are influenced by abdominal pressure. DESIGN AND SETTING: Prospective, randomized, controlled trial in the animal laboratory of a university hospital. SUBJECTS: Eight sedated and ...
Weingarten Toby N - - 2004
Venous pressures measured from peripheral venous catheters (PVP) closely estimate the central venous pressure (CVP) in surgical and critically ill patients. CVP is often used to estimate intravascular volume; however, fluctuations of CVP may also be induced by changes in venous tone caused by alpha-adrenergic catecholamine stimulation. We simultaneously monitored ...
Anter A M - - 2004
BACKGROUND: Peripheral venous pressure (PVP) is easily and safely measured. In adults, PVP correlates closely with central venous pressure (CVP) during major non-cardiac surgery. The objective of this study was to evaluate the agreement between CVP and PVP in children during major surgery and during recovery. METHODS: Fifty patients aged ...
Zhang Hong Lei - - 2004
OBJECTIVE: We evaluated the potential for improving bolus chase peripheral MR angiography in patients with fast arterial flow using thigh compression to prevent venous contamination. SUBJECTS AND METHODS: We performed bolus chase peripheral MR angiography in 32 consecutive patients in whom the travel time for a contrast agent to reach ...
Meendering Jessica R - - 2005
Numerous studies have shown that the female sex hormones estrogen and progesterone have multiple effects on the vasculature. Thus our goal was to investigate the effects of estrogen and progesterone on calf venous compliance by looking for cyclic changes during the early follicular, ovulatory, and midluteal phases of the menstrual ...
Wright Christopher I - - 2004
BACKGROUND: The Brooksby-Donald approach uses two flow probes to measure the inflow and outflow from an organ or vascular bed; the difference in flow can be time-integrated to assess changes in venous capacitance. OBJECTIVES: To measure changes in subdiaphragmatic venous capacitance and arterial conductance in acutely instrumented rabbits, and to ...
Tachibana M - - 2004
AIM: The purpose of this study was to investigate the relationship between air-plethysmographic volume parameters under standard exercise loading and foot venous pressure parameters under ideal exercise loading in patients with primary varicose veins. METHODS: Seventy-one lower limbs in 39 patients with primary varicose veins and 8 lower limbs in ...
Durán A C - - 2004
The formation of cartilage in the mammalian heart has been studied in the aortic and pulmonary valves. The chondrogenetic process that takes place in the cardiac skeleton is still unknown. The present study was designed to illustrate the ontogeny of cartilaginous foci occurring in the central fibrous body of the ...
West Bruce J - - 2004
The purpose of the study was to determine the dependency of the statistical properties of the R to R interval (RRI) time series on progressive central hypovolemia with lower body negative pressure. Two data-processing techniques based on wavelet transforms were used to determine the change in the nonstationary nature of ...
Hadjikoutis S - - 2004
The venous drainage of the orbit is known to be via the ophthalmic and vortex veins which communicate with the cavernous sinus. We describe two patients with raised intracranial pressure presenting with periorbital bruising. In one patient dural venous sinus thrombosis was demonstrated and it is suspected that the cause ...
Neglén Peter - - 2004
This study was undertaken to assess which ultrasound-derived parameter was superior for measuring venous reflux quantitatively and to evaluate the importance of popliteal vein valve reflux. A retrospective analysis was performed of 244 refluxive limbs in 182 patients who underwent ultrasound scanning, venous pressure measurement, air plethysmography, and clinical classification ...
Tugrul Mehmet M Department of Anaesthesiology, Istanbul University, Istanbul, Turkey. - - 2004
To investigate the relationship between peripheral and central venous pressures in different patient positions (supine, prone, lithotomy, Trendelenburg, and Fowler), different catheter diameters (18 G and 20 G), and catheterization sites (dorsal hand and forearm) during surgical procedures. Prospective clinical study. University hospital. Five hundred adult patients. Peripheral over-the-needle intravenous ...
Santelices Samuel - - 2004
OBJECTIVE: To compare simultaneous central venous pressure measurements from rigid polyurethane and soft tunneled silicone elastomere catheters. HYPOTHESIS: There will be no significant difference in central venous pressure readings between polyurethane and silastic catheters. SETTING: Bone Marrow Transplant Unit in a tertiary care children's hospital. PATIENTS: Five children undergoing bone ...
Henkes H - - 2004
Arteriovenous malformations (AVMs) are composed of abnormal arterial and venous vessels in the brain causing arteriovenous shunts of arterialized blood directly from pial arteries to draining veins. The hemodynamics of these lesions is not well-understood. Changes in blood flow and pressure are probably related to the natural history of AVMs ...
Dawson E A - - 2004
Model studies have been advanced to suggest both that a siphon does and does not support cerebral blood flow in an upright position. If a siphon is established with the head raised, it would mean that internal jugular pressure reflects right atrium pressure minus the hydrostatic difference from the brain. ...
Takase Shinya - - 2004
In human beings, chronic venous insufficiency is linked to venous hypertension. This in turn is associated with venous valve incompetence. This study was designed to test the hypothesis that venous hypertension serves to initiate a process that results in the venous valve and venous wall damage observed in venous insufficiency. ...
Partsch Hugo - - 2004
BACKGROUND: Evening edema of the legs is a physiologic phenomenon occurring after sitting and standing. OBJECTIVE: The objective of this study was to investigate which compression pressure is necessary to prevent leg swelling. METHODS: In 12 volunteers, the volume of both lower legs was measured in the morning and 7 ...
Cesarone M R - - 2004
The aim of this efficacy study was to evaluate local capillary fragility with the vacuum suction chamber (VSC) in patients with chronic venous hypertension due to chronic venous disease. All included patients had important ankle edema due to venous hypertension because of a post-thrombotic syndrome. Severe, deep, venous incompetence was ...
Ruffini I - - 2004
Aescin and essential phospholipids (AEPL) in a gel was used in a microcirculatory model to assess the effects on skin perfusion in chronic venous insufficiency and severe venous hypertension. The aim of this efficacy study was to evaluate the efficacy of an AEPL gel on the microcirculation measuring transcutaneous skin ...
Howe B Matthew - - 2004
We examined c-Fos and FosB staining in the central nervous system 8 and 24 h following acute volume expansion in unanesthetized rats. Male rats were instrumented with a femoral artery catheter for measurement of blood pressure and heart rate (HR), a jugular venous catheter for measurement of central venous pressure ...
Mulhall J P - - 2004
While dynamic infusion cavernosometry (DIC) is being performed with increasing rarity, some centers continue to use this investigation modality. Cavernosography may be utilized to identify the location of patent venous channels in men with venous leak. In an era when venous ligation surgery is being performed with less frequency, the ...
Jonas J B - - 2004
To evaluate whether determination of the central retinal artery and vein collapse pressure correlate with systemic blood pressure measurements, using a new Goldmann contact lens associated ophthalmodynamometric device The prospective clinical study included 92 eyes of 92 patients presenting with cataract or refractive problems (n = 40; control study group) ...
Uemura Kazunori - - 2004
A novel framework of circulatory equilibrium was developed by extending Guyton's original concept. In this framework, venous return (CO(V)) for a given stressed volume (V) was characterized by a flat surface as a function of right atrial pressure (P(RA)) and left atrial pressure (P(LA)) as follows: CO(V) = V/W - ...
YildizdaƟ D - - 2004
AIMS: To investigate the correlation of pH, partial pressure of oxygen (PO2), partial pressure of carbon dioxide (PCO2), base excess (BE), and bicarbonate (HCO3) between arterial (ABG), venous (VBG), and capillary (CBG) blood gases. METHODS: Patients admitted to the paediatric intensive care unit (PICU) in Cukurova University between August 2000 ...
Sezer M - - 2004
To investigate the relation between the degree of ST segment resolution (STR) after thrombolysis and the pressure derived collateral flow index (CFIp), determined using an intracoronary pressure measurement technique in patients with recent myocardial infarction. 33 patients were studied. TIMI grade III flow was achieved in the infarct related artery ...
Feldman L S - - 2004
BACKGROUND: While the popularity of laparoscopic donor nephrectomy (LDN) has increased, concern persists about the potential deleterious effects of pneumoperitoneum on renal function. Thus, preload optimization with vigorous intravenous hydration has been recommended. The purpose of this study was to compare central venous pressure (CVP) monitoring with a noninvasive measure ...
Bateman Grant A - - 2004
It has long been recognized that a clinical syndrome similar to idiopathic intracranial hypertension can occur secondary to venous sinus obstruction with the elevation in sinus pressure causing a reversal in the pressure gradient across the arachnoid granulations and therefore elevated CSF pressure. There remains, however, a group of predominantly ...
Sándor T - - 2004
Uniform view of chronic venous diseases has been formed in the last 3 decades. Chronic venous insufficiency (CVI) is a functional disorder of the venous system of the lower limb. The basis of the pathology is always the venous hypertension caused by valvular insufficiency and reflux with or without venous ...
Fernandez Edward G - - 2004
OBJECTIVE: To assess the value of low inferior vena caval (LIVC) catheters for estimating central venous pressure in pediatric intensive care patients and to assess influences of intra-abdominal pressures and mean airway pressure on these measurements. DESIGN: Prospective cohort of consecutive patients. SETTING: Pediatric intensive care unit. PATIENTS: Thirty patients ...
Ekim Hasan - - 2004
PURPOSE: Purulent pericarditis has become a rare disease since the introduction of antibiotics into clinical practice. Standard management consists of antibiotics and surgical drainage. In this study we also instilled streptokinase to obliterate the loculations and fibrin strands in patients with purulent pericarditis. METHODS: Between October 1997 and October 2002, ...
Modesti P A - - 2004
To characterise the efficiency of the cardiopulmonary baroreflex system in the early phase of heart failure and its relation to limitation of physical activity. Forearm blood flow (venous occlusion plethysmography), vascular resistance, and central venous pressure (CVP), estimated from an antecubital vein, were measured in the supine position at baseline ...
Bleeker M W P - - 2004
Venous function may be altered by bed rest deconditioning. Yet the contribution of altered venous compliance to the orthostatic intolerance observed after bed rest is uncertain. The purpose of this study was to assess the effect of 18 days of bed rest on leg and arm (respectively large and small ...
Higgins J N P - - 2003
BACKGROUND: The high pressures documented in the intracranial venous sinuses in idiopathic intracranial hypertension (IIH) could be the result of focal stenotic lesions in the lateral sinuses obstructing cranial venous outflow. OBJECTIVE: To explore the relation between venous sinus disease and IIH. METHODS: 12 patients with refractory IIH had dilatation ...
Donina Zh A - - 2003
Changes in the ratio between intrathoracic and central venous pressure were studied in narcotized cats under conditions of constant positive or negative pressure ventilation. Transformation of elastic characteristics in the respiratory system caused by changes in intrathoracic pressure led to inversion of the ratio between transpulmonary intrathoracic and central venous ...
Brinsuk Marina - - 2004
OBJECTIVE: Venous function contributes to the pathogenesis of thrombophlebitis, venous thrombosis, and possibly to arterial hypertension. Venous disease is presumably heritable; however, the genetic variance of venous function is unknown. METHODS AND RESULTS: We determined the heritability of venous function in 46 twin pairs (24 monozygotic, age 35+/-11 years, 14 ...
Monahan Kevin D - - 2004
Leg venous compliance is a determinant of peripheral venous pooling during orthostatic stress such that high venous compliance could contribute to reduced orthostatic tolerance. We tested the hypotheses that 1) calf venous compliance is reduced during baroreceptor unloading, and 2) calf venous compliance is greater in women than men. Twelve ...
Desjardins Roger - - 2004
OBJECTIVE: Pressure measurements at the level of the right atrium are commonly used in clinical anesthesia and the intensive care unit (ICU). There is growing interest in the use of peripheral venous sites for estimating central venous pressure (CVP). This study compared bias, precision, and covariance in simultaneous measurements of ...
Joseph Mathew - - 2003
INTRODUCTION: Vasospasm after subarachnoid hemorrhage remains a management challenge. The accepted treatment involves hypertensive, hypervolemic, hemodilution therapy. However, there is variation in the application of this treatment. Most authors increase mean arterial pressure (MAP), which can be associated with significant morbidity. Others increase cardiac output (CO). In this study, we ...
Healey Chris - - 2003
Venous hypertension leads to venous stasis ulcers. White cell activation, protein leakage from pressurized capillaries, and cytokine imbalances have all been implicated as indirect effects of venous hypertension that contribute to dermal changes seen in chronic venous insufficiency. The direct effect of increased tissue pressures on dermal elements has not ...
Schadt James C - - 2004
In the conscious rabbit, exposure to an air jet stressor increases arterial pressure, heart rate, and cardiac output. During hemorrhage, air jet exposure extends the blood loss necessary to produce hypotension. It is possible that this enhanced defense of arterial pressure is a general characteristic of stressors. However, some stressors ...
Fukuoka Masato - - 2003
The purpose of this study was to evaluate lower extremity venous function in patients with chronic venous insufficiency, with foot venous pressure (FVP) measurements and air plethysmography (APG). Eighty-five limbs of 63 patients with a history of chronic venous insufficiency (CVI) from 1995 to 1999 were studied. FVP parameters studied ...
Wang Liyun L Department of Orthopaedics, The Mount Sinai School of Medicine, New York, NY 10029, USA - - 2003
This paper addresses the question of whether or not interstitial fluid flow due to the blood circulation accounts for the observed periosteal bone formation associated with comprised venous return (venous stasis). Increased interstitial fluid flow induced by increased intramedullary pressure has been proposed to account for the periosteal response in ...
Alomari Mahmoud A - - 2004
The main purpose of the present study was to examine the relationships between measures of fitness [estimated peak oxygen consumption (V(O2) peak) and handgrip strength] and forearm vascular function in 55 young (22.6 +/- 3.5 yr) adults. In addition, the present study considered methodological and technical aspects regarding the examination ...
Milhoan K A - - 2004
After the bidirectional cavopulmonary or Fontan operation, the physiologic consequence is passive flow of the systemic venous return to the pulmonary arteries. Knowledge of pulmonary artery pressure (PA) is valuable in the management of these patients, and obtaining this information without the need for a central line or cardiac catheterization ...
Desmond Joel - - 2003
A short cut review was carried out to establish whether femoral central venous lines were as reliable as subclavian or jugular lines at assessing right atrial filling pressure. Altogether 141 papers were found using the reported search, of which seven presented the best evidence to answer the clinical question. The ...
Tkachenko B I - - 2003
Experiments on cats treated with nitroglycerin showed dynamic relationship between changes in caval venous flows: blood flow increased in the superior vena cava and decreased in the inferior vena cava. Blood pressure in the right atrium either decreased, or increased. No significant changes in total venous return were observed during ...
Moore A - - 2003
The ageing process is associated with important changes in the responses of the cardiovascular system to pharmacological stimuli. They are not limited to the arterial system, involved in the modulation of cardiac afterload and vascular resistance, but they also involve the low-resistance capacitance venous system and the heart. The main ...
Schipke J D - - 2003
The static pressure resulting after the cessation of flow is thought to reflect the filling of the cardiovascular system. In the past, static filling pressures or mean circulatory filling pressures have only been reported in experimental animals and in human corpses, respectively. We investigated arterial and central venous pressures in ...
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