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Pascoe P J - - 1994
Cardiopulmonary effects of halothane administration were studied in hypovolemic dogs. Baseline cardiopulmonary data were recorded from conscious dogs after instrumentation. Hypovolemia was induced by withdrawal of blood from dogs until mean arterial pressure of 60 mm of Hg was achieved. Blood pressure was maintained at 60 mm of Hg for ...
Shiramoto M - - 1994
Calcium antagonists are potent dilators of resistance vessels but do not dilate capacitance vessels. CD832 is a novel dihydropyridine calcium antagonist which has a nitrate moiety in its chemical structure. The authors examined the effects of CD832 on venous capacitance in anesthetized rats. Venous capacitance was assessed by measuring mean ...
Deschamps A - - 1994
To determine the effect of neuropeptide Y (NPY) on regional vascular capacitances, we measured the regional blood volume (Vb), unstressed volume (V0), blood flow distribution, venous compliance (Cv), venous resistance (Rv), and the time constant of venous drainage (tau v) in the splanchnic and extrasplanchnic circulation of 13 dogs anesthetized ...
Hassler W - - 1994
During ten operations for spinal dural arterio-venous fistulas (AVF), intraoperative measurement of flow velocity and intravascular pressure was performed. Flow velocities were recorded using a miniaturized Doppler probe. Intravascular pressure changes in the draining veins before and after AVF removal was measured with small needles. Varying the pCO2 between 20 ...
Lung M A - - 1993
It is known that parasympathetic nerve stimulation elevates venous pressure in the dog submandibular gland, and that the venous pressure wave is transformed to that of the arterial pulse. The vascular arrangements and histological characteristics of the dog submandibular gland were therefore examined to establish which anatomical structures are responsible ...
Taylor A W - - 1993
The exact anatomy of the central retinal vein as it exits the eye is unknown. In this study serial sections of the central retinal vein and artery in the anterior optic nerve from six globes (five from cornea donors and one exenteration specimen) were examined by image analysis and three-dimensional ...
Belcaro G V - - 1993
Chronic venous hypertension produces microangiopathy which often progresses to ulceration. It has been recently observed that intermittent sequential compression (ISC) increases the rate of healing of venous ulcers. The aim of this study was to investigate the effect of this form of therapy on the microcirculation in limbs with venous ...
Rose W C - - 1993
Hemodynamic properties of the systemic vasculature were measured in eight anesthetized dogs using two-port impedance analysis. Blood pressures and flows were measured at the aortic root and the caval-atrial junction. Impedances were computed from 0.05 to 20 Hz to characterize the systemic vasculature. Pseudorandom variations in flow were produced with ...
Kiev J - - 1993
We studied 27 patients with venographically documented bilateral subclavian vein occlusion thrombosis after the use of dual lumen hemodialysis catheters. Immediate venous access was severely limited because all patients had previously had multiple access failures. The rate of venous pressure rise between hemodialysis treatments is inconsistent in suggesting imminent thrombosis ...
van Bemmelen P S - - 1993
Duplex ultrasonography with distal cuff deflation was used to determine the presence and size of incompetent veins and compare the results with those of air plethysmography in patients with chronic venous insufficiency. Thirty-two legs underwent a detailed study with both modalities. Sixteen legs had venous ulceration, six had stasis dermatitis, ...
Lee T S - - 1993
The insertion of a central venous pressure (CVP) catheter has been known to be associated with a variety of complications. Among these, isolated hydromediastinum is relatively rare. We recently encountered a patient who developed hydromediastinum due to extravascular penetration of a CVP line inserted via the right external jugular vein. ...
Palmer M - - 1993
Argon-enhanced coagulation (AEC) is a method for operative coagulation of tissues that utilizes a jet of argon gas encompassing an electrofulguration arc. Concern has been raised that the argon jet may produce harmful venous gas embolization. Two questions were addressed by this study. First, does AEC result in generation of ...
Arcaya J - - 1993
The natural history of symptomatic adult type I Arnold-Chiari (ACM1) malformation is variable. Patients with this condition frequently develop corticospinal and sensory deficits, together with cerebellar signs and lower cranial nerve palsies in various combinations. In the present report we describe a patient with ACM1 in whom sleep apnea together ...
Lew T W - - 1993
To confirm the incidence of venous air embolism (VAE), we simultaneously monitored expired nitrogen concentration (FEN2) and precordial Doppler in 30 patients undergoing cesarean delivery during general anesthesia. Patients were randomized into two groups and the effect of a 10 degrees reverse Trendelenburg tilt versus the horizontal position was evaluated. ...
Aita D J - - 1993
Four-compartment fasciotomies used to relieve abnormally high compartment pressures necessitate interruption of the ensheathing fascial membrane. In the calf, this is considered an important component in maintaining a viable musculovenous pump and preventing venous hypertension, a leading cause of venous insufficiency. Through postoperative physical examination and photoplethysmography evaluation of 47 ...
Ferguson J - - 1993
Interface pressures beneath six types of collar in volunteers were measured. Under certain types of collar mean interface pressures of more than 10 mmHg were obtained, with several individual readings around 30 mmHg. By causing jugular venous obstruction a similar rise in intracranial pressure may be produced inadvertently. The mechanisms ...
Payne S P - - 1993
Air plethysmography was compared with clinical assessment, ambulatory venous pressure measurement and duplex ultrasonography in 103 unselected limbs with venous disease and ten normal control limbs without such disease. Measurements of venous function obtained by air plethysmography showed considerable overlap between groups of limbs classified on the basis of clinical ...
Gabrielsen A - - 1993
Thermoneutral (34.9 degrees C) water immersion (WI) was conducted with 12 upright seated normal males at four consecutive water levels (5-10 min each): knee (reference), xiphoid process, fourth intercostal space, and sternoclavicular notch. Thereafter, water was let out of the tank and the experiment was repeated from the neck to ...
Liang J - - 1993
The purpose of this study was to examine the effects of prostaglandin E1 (PGE1) on venous capacitance during controlled hypotension. Trinitroglycerin (TNG) was used as a control agent. In rats anesthetized with ketamine, mean arterial pressure was lowered to 70 mmHg and subsequently 50 mmHg by intravenous infusion of PGE1 ...
Tollan A - - 1993
Effects of ovarian stimulation for in vitro fertilization on blood pressure and plasma catecholamine levels were studied in 10 women. The examinations were carried out before hormonal treatment with human menopausal gonadotropin (day three of the menstrual cycle, mean serum oestradiol concentration 0.2 nmol l-1, and on the day after ...
Shi X - - 1993
Fourteen healthy young men were exposed to progressive increases in lower body positive pressure (LBPP) from 0 to 40 Torr in the supine position. Central venous pressure (CVP) increased 1.09 mmHg (P < 0.05) at 5 Torr LBPP. Between 20 and 40 Torr LBPP CVP increased 0.85 mmHg, resulting in ...
Kitoh T - - 1993
To study the contribution of tissue components to the mechanical properties of veins, pressure-volume relationships were obtained with the cylindrical segments of isolated dog external jugular veins at several levels of longitudinal extension. At each length, the transmural pressure of the segment was raised up to 20 cmH2O and then ...
Leon M - - 1993
The aim of this study was to establish the long-term effect of graduated elastic compression on venous elasticity in patients with superficial or deep venous disease and to determine the possible relationship between elasticity and the duration of the disease. The elastic modulus of 29 patients, 19 with superficial vein ...
Nakhostine M - - 1993
Pressures in the tibialis anterior muscle were recorded at rest and during exercise with transducer-tipped catheters in 12 volunteers while they were supine or standing. The recordings were repeated with venous stasis created by an inflated tourniquet cuff on the thigh. Catheters were placed at 3 different sites in the ...
Gamble J - - 1993
1. We have used non-invasive mercury in a silastic strain gauge system to assess the effect of pressure step size, on the time course of the rapid volume response (RVR) to occlusion pressure. We also obtained values for hydraulic conductance (Kf), isovolumetric venous pressure (Pvi) and venous pressure (Pv) in ...
Beebe D S - - 1993
Intraoperative venous stasis may increase the risk for perioperative deep vein thrombosis and pulmonary embolism. To determine if abdominal insufflation during laparoscopic cholecystectomy causes venous stasis, eight patients undergoing this procedure had their left common femoral veins examined by a duplex scanner before and after abdominal insufflation; the veins then ...
Langham B T - - 1993
We have compared the cardiovascular response to insertion of an 18-gauge venous cannula in 40 healthy patients. In 20 of the patients, cannulation was preceded by infiltration of local anaesthetic. Both rate-pressure product and mean arterial pressure increased significantly (P < 0.01) compared with baseline when no local infiltration was ...
Fukutome T - - 1993
A newly designed 4 FG double-lumen catheter with the second port located either 5 or 7 cm proximal to the tip was tested in five children undergoing open heart surgery. The catheter was inserted percutaneously and initially positioned in the superior vena cava, right atrium or inferior vena cava. During ...
Doig J C - - 1993
A 62-year-old lady who was receiving corticosteroids for rheumatoid arthritis was admitted suffering from dehydration due to salmonella enteritis. Despite rehydration and appropriate chemotherapy she remained unwell and developed hypotension and elevation of her jugular venous pressure. Echocardiography and subsequent aspiration demonstrated a purulent pericardial effusion from which S typhimurium ...
Hopf H B - - 1993
In healthy humans, the increase in arterial blood pressure seen in patients with autonomic dysfunction in response to exogenous vasopressin (AVP) is abolished. We tested the hypothesis that redistribution of blood from the intra- to the extrathoracic vascular compartment might contribute to this buffer response. Regional distribution of 99mTc labeled ...
Manyari D E - - 1993
BACKGROUND: No method exists to assess human splanchnic venous function, the most important region in terms of vascular capacity. METHODS AND RESULTS: We studied 25 stable patients without heart failure or hypertension to develop a method to assess the splanchnic venous volume-pressure (V-P) relation and to determine the effect of ...
Sullivan K L - - 1993
Pressures were measured in the graft and the central vein during 104 consecutive angiographic examinations of failing hemodialysis grafts. Stenosis severity greater than 40% led to a statistically significant rise in graft pressure. In grafts in which all stenoses were of 40% or less severity, the systolic pressures in the ...
Weiner C P - - 1993
OBJECTIVE: Nonimmune hydrops fetalis continues to have a perinatal mortality rate > 50%. Although many abnormalities are associated with nonimmune hydrops fetalis, the direct mechanism by which the hydrops occurs is often obscure, even after delivery. There are at least three possible mechanisms for hydrops: heart failure (whether primary or ...
Raju S - - 1993
We investigated the factors determining postexercise pressure and the relationship of venous valve closure and venous column segmentation to ambulatory venous pressure changes. Valve closure and venous segmentation were observed during dynamic ascending phlebography in 40 nonrefluxive limbs and by duplex imaging in 25 normal limbs in healthy volunteers. Simultaneous ...
Merrett N D - - 1993
Graduated compression stockings are frequently used in the prevention of deep venous thrombosis and the treatment of venous insufficiency. Two patients are discussed who sustained ischaemic complications after application of graduated compression stockings. Review of the literature demonstrates that low cutaneous pressures significantly decrease local blood flow and that the ...
Neglén P - - 1993
This study compares three different modes for measuring hemodynamically significant outflow obstruction in chronic venous insufficiency: (1) arm-foot venous pressure differential combined with foot venous pressure elevation to reactive hyperemia, (2) outflow fraction determination with plethysmography, and (3) calculation of resistance from simultaneously obtained foot venous pressure and calf volume ...
Pesola G R - - 1993
OBJECTIVE: To assess the accuracy of room-temperature thermodilution cardiac output measurements from the venous infusion port. DESIGN: Central venous port cardiac output measurements were compared with venous infusion port measurements in 48 right-heart catheters. INTERVENTION: Three 10-mL injections of 5% dextrose in water were made through each port. The order ...
Gaylarde P M - - 1993
Skin blood flow in the lower leg is increased by external compression in standing subjects. This prevents the hypoxia induced by standing. The maximum increase in oxygen tension is seen when the external pressure is 40-50 mmHg. Pressures in the range of those produced by lightweight elastic stockings were found ...
Martin D S - - 1993
Venous capacitance plays an important role in cardiovascular homeostasis. The anatomical loci within the central nervous system involved in modulating venous function remain to be elucidated. Stimulation of the hypothalamic paraventricular nucleus is known to increase sympathoadrenal outflow and arterial blood pressure. The present study was undertaken to determine whether ...
Madsen P - - 1993
We compared central venous oxygen saturation and central venous pressure (CVP) as indices of the effective blood volume during 50 degrees head-up tilt (anti-Trendelenburg's position) induced hypovolaemic shock in eight healthy subjects. Head-up tilt increased thoracic electrical impedance from 31 (28-36) (median and range) to 34 (30-40) Ohm, mean arterial ...
Bealer S L - - 1993
Vascular capacitance was studied in anesthetized control (CONT) animals and in rats after electrolytic ablation of the periventricular tissue surrounding the anteroventral third cerebral ventricle (AV3V-X). Blood volume (BV) was determined by use of radiolabeled serum albumin, and mean arterial pressure (MAP) and central venous pressure (CVP) were continuously measured. ...
Nicolaides A N - - 1993
Two hundred thirty-six limbs of 220 unselected patients who were admitted with venous problems (83 with ulcers) were studied with continuous-wave Doppler ultrasonography, duplex scanning, and ambulatory venous pressure measurements. Patients with evidence of deep venous disease because of reflux or obstruction in the deep veins on Doppler and duplex ...
Kristiansen A B - - 1993
The haemodynamic effects of sympathetic agonists causing decongestion of the nasal mucosa have been investigated in rats. Access to mucosa was obtained from the dorsal side through a small cavity drilled in the nasal bone. The pressures in the venous sinusoids and in the interstitial fluid of nasal mucosa were ...
Fang B R - - 1993
A 26-year-old female was involved in a car accident with impaction of the steering wheel to the anterior chest. She became unconscious immediately. Blood pressure was unmeasurable, central venous pressure was measured at 25 cm H2O. Cross-sectional echocardiography revealed pericardial effusion and a band-like blood clot in the posterior inferior ...
Latham R D - - 1993
Theoretical concepts hold that blood in the gravity-dependent portion of the body would relocate to more cephalad compartments under microgravity conditions. The result is an increase in blood volume in the thoracic and cardiac chambers. This increase in central volume shift should result in an increase in central atrial filling ...
Tabrizchi R - - 1993
The mean circulatory filling pressure technique has been used to assess total body venous tone. It involves measuring central venous pressure (CVP) at 5-8 s following circulatory arrest. This study examines if CVP and portal venous pressure (PVP) equilibrate when circulation is stopped by inflating a balloon implanted in the ...
Vernalis M N - - 1993
The central cardiovascular responses to transient microgravity are not well understood. Theoretically, entrance into microgravity results in the loss of the hydrostatic pressure head and an increase in central venous pressure (CVP) as a consequence of augmented venous return. However, controversy exists regarding the time course and magnitude of cephalad ...
Hildebrandt W - - 1993
Elevation of vascular hydrostatic pressure is known to increase capillary filtration causing, for example orthostatic plasma fluid losses. The present study investigated possible compensatory fluid intravasation in the human forearm during graded elevation, that is during hydrostatic venous collapse. Recordings were made of forearm fluid volume (impedance-plethysmography), forearm blood flow ...
Welch R D - - 1993
We investigated the effects of increased intraosseous pressure on new-bone formation in the proximal metaphysis of the caprine tibia. Intraosseous hypertension was produced by obstruction of venous outflow by ligation of the popliteal vein draining the proximal aspect of the tibia and occlusion of the medullary space with bone cement ...
Tollan A - - 1993
There is scant information on the effects of progesterone on circulation. Changes in catecholamine levels, blood pressure and transcapillary fluid balance were measured in 12 men before and during administration of natural progesterone (Utrogestan). Before administration, systolic blood pressure was significantly correlated with venous adrenaline (r = 0.67, p = ...
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