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Results 751 - 800 of 1283
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Muikku O - - 1992
In a placebo-controlled trial, we have studied the vasodilator properties of bolus doses of nitroglycerin (TNG) and isosorbide dinitrate (ISDN) in 32 patients during cardiopulmonary bypass with a constant pump flow. Blood volume of the venous reservoir and mean arterial pressure were recorded for 10 min after drug administration to ...
Nakamura Y - - 1992
The effects of selective cardiopulmonary receptor unloading on atrioventricular (AV) conduction were examined in 7 patients undergoing electrophysiologic testing. During -35 mmHg lower body negative pressure (LBNP) before autonomic blockade with propranolol and atropine, the AV-nodal conduction time (AH interval), the effective and functional refractory periods of AV node decreased ...
Lloyd T R - - 1992
Central venous pressure measurements in the abdominal inferior vena cava were compared with measurements in the right atrium in 10 infants and 10 children during cardiac catheterization. At end expiration, the mean pressures at these two sites were within 1 mm Hg of each other in all 20 patients, with ...
Davis M J - - 1992
We tested the hypothesis that the frequency and amplitude of spontaneous venular contractions in the bat wing could be modulated by changes in transmural pressure. In one series of experiments, venous pressure in the wing was elevated by pressurizing a box containing the body of the animal while the wing ...
Chien Y Y Alton Ochsner Medical Foundation, New Orleans, Louisiana - - 1992
To test whether quinaprilat, a new angiotensin-converting enzyme (ACE) inhibitor, has any venous effect, we measured its immediate effects on mean circulatory filling pressure (MCFP), intravascular volume, and total body vascular (i.e., venous) compliance in conscious rats with healed myocardial infarction induced by coronary artery ligation. MCFP was determined by ...
Tibballs J - - 1992
The cardiovascular and haematological effects of purified prothrombin activator derived from the venom of the Australian Common Brown Snake (Pseudonaja textilis) were studied in anaesthetised, mechanically ventilated dogs. Severe depression of systemic blood pressure and cardiac output and a rise in central venous pressure were observed. Thrombocytopenia, prolongation of both ...
Rozen E K - - 1992
The administration of regional anesthesia to women with moderately severe and severe pre-eclampsia is commonly preceded by intravenous hydration guided by central venous pressure (CVP) monitoring. We are reporting the case of a gravida with incipient HELLP syndrome whose fluid management before, during, and after cesarean section under continuous extradural ...
Berg R A - - 1992
STUDY OBJECTIVE: To test the hypotheses that in multiple pathophysiologic settings (1) end-expiratory central venous pressure measurements in the intraabdominal inferior vena cava accurately reflect those in the superior vena cava and (2) mean central venous pressure monitoring is as reliable in the inferior vena cava as it is in ...
Gamble J - - 1992
We have used the mercury in silastic strain gauge plethysmography (MSG) system, which is wholly non-invasive, to obtain values (mean +/- s.e.m.) for the following parameters in the legs of supine control subjects: venous pressure (Pv) 9.89 +/- 0.88 mmHg, vascular compliance (Comp) 3.50 +/- 0.29 ml 100 g-1 mmHg-1 ...
Kruse A - - 1992
In 48 patients undergoing transsphenoidal surgery for pituitary adenoma, the intrasellar pressure was recorded during surgery. In 14 patients, adenoma blood flow was measured with the technique of local injection of 133xenon. Median intrasellar pressure was 30 mmHg (range 8-62), n = 48, and median adenoma blood flow was 8 ...
Pina J - - 1992
An internal jugular catheter, which was inserted into a patient with a traumatic haemopneumothorax, accidentally entered the pleural cavity. This was initially undetected because the two signs most frequently used to confirm correct placement, those of blood reflux and fluctuation of central venous pressure with respiration, were positive. A number ...
Hirakawa S - - 1992
To investigate the effect of milrinone (MIL) on systemic capacitance vessels, we measured the mean circulatory filling pressure (MCP) in anesthetized open chest dogs. We measured hemodynamic parameters (a) at baseline blood volume (BV), (b) immediately after bloodletting (5 ml/kg), and (c) immediately after dextran injection (5 ml/kg). These measurements ...
Suzuki T - - 1992
In dogs, the venous blood from the prostate gland was observed under X-ray fluoroscopy to drain into the vertebral venous system under conditions of abdominal compression, the addition of various intraabdominal pressures, and occlusion of the inferior vena cava by a balloon catheter. Pressure in the inferior vena cava and ...
Fallentin N - - 1992
1. The relationship between [K+] in venous effluent blood and alterations in mean arterial blood pressure was studied during static handgrip contractions at 15 and 30% of maximal voluntary contraction (MVC). 2. To further elucidate the importance of K+ in the reflex regulation of blood pressure a situation with normal ...
Szendro G - - 1992
The long term effect of elastic compression, with an emphasis on the changes in venous wall elasticity, was studied in 10 limbs with varicose veins. By simultaneously measuring venous volume, using the air plethysmograph (APG), and venous pressure, while the venous outflow was occluded, the pressure/volume (P/V) relationship of the ...
Martin C - - 1992
Continuous monitoring of mixed venous (SvO2) and central venous (ScO2) oxygen saturation was compared in 7 critically-ill patients (Apache II score: 19 +/- 2.1) to determine whether or not information derived from ScO2 were reliable in clinical practice. Patients were catheterized with both a pulmonary artery (PA) and a central ...
Murthy K R - - 1991
The efficacy of insulin administration in reversing haemodynamic changes in pulmonary oedema in victims of poisonous scorpion sting is assessed by a study based on animal experiments in which insulin administration reversed metabolic and electrocardiographic changes induced by scorpion envenomation. Six previously healthy children aged 18 months to 11 years ...
Kalen V - - 1991
Pericardial tamponade from an indwelling central venous catheter developed in four orthopaedic patients. Two of these patients died acutely, and the other two sustained severe anoxic brain injury. The early signs of tamponade include tachycardia, hypotension, and increased central venous pressure. The outcome most often is fatal. When a central ...
Yamada H - - 1991
The cardiohemodynamic effect of (+/-)-(E)-4-ethyl-2-[(E)-hydroxyimino]-5-nitro-3-hexenamide (FK409), a novel potent vasodilator, was studied in anesthetized open-chest dogs. FK409 (1 to 10 micrograms/kg, i.v.) decreased mean blood pressure, cardiac output and venous return (sum of the flow through the inferior and the superior vena cava). These changes accompanied decreases in left ventricular ...
van den Broek T A - - 1991
In a prospective study, the results of venous function tests in 19 lower extremities with deep venous insufficiency and in seven control extremities were compared. First, the routine method of asking the patients to exercise their calves was used. Second, cuffs around the calves were rapidly inflated, producing standardized external ...
Ali J - - 1991
STUDY OBJECTIVES: To clarify apparently conflicting reports on the hemodynamic effects of the pneumatic antishock garment (PASG). DESIGN: Ten anesthetized dogs with hemorrhagic hypotension had hemodynamics measured without PASG inflation (group 1) and were compared with ten dogs with PASG inflation (group 2). MEASUREMENTS AND MAIN RESULTS: Baseline and immediate ...
Wakefield T W - - 1991
Experimental models of deep venous thrombosis, heretofore, have not been available for laboratory studies. This investigation establishes a novel model of venous thrombosis by inhibiting the protein C system combined with venous stasis and subtle venous injury. Ten adolescent baboons were studied in pairs, with one animal receiving saline solution ...
Shabsigh R - - 1991
A total of 50 patients with impotence underwent cavernosometry and cavernosography with intracavernous injection of vasoactive drugs. Several hemodynamic parameters were analyzed, including the pressure response curve after injection of vasoactive drugs and infusion of saline, the volume required to achieve erection, venous outflow resistance, erection maintenance infusion rate, rate ...
Esato K - - 1991
Twelve patients with peripheral arterial occlusive disease were evaluated prospectively in an effort to further investigate the etiology of pedal and lower leg edema that occurs following revascularization (e.g., aorto-iliac or femoropopliteal bypass). Serum total protein, albumin, blood urea nitrogen, and creatinine levels were measured (in addition to peripheral venous ...
Gascho J A - - 1991
The venodilatory response to nitroglycerin (0.8 mg sublingually) was measured in 10 healthy young male volunteers in a cool [24.3 +/- 0.6 degrees C skin temperature (Tsk)] and a warm environment (34.7 +/- 0.2 degrees C Tsk). Nitroglycerin caused mean arterial pressure to fall and heart rate to rise in ...
Sami H M - - 1991
Venous pulsations are thought, but to our knowledge have never been demonstrated, to result in underestimation of oxygen saturation measured by pulse oximetry (SpO2); however, to our knowledge, this has never been demonstrated. A patient with ischemic cardiomyopathy requiring intra-aortic balloon counterpulsation (IABC) had to withstand a temporary cessation of ...
Diament M J - - 1991
A commercially available double-lumen central venous catheter that can be inserted over a 0.018-inch guide wire was used for ureteral perfusion studies in three infants. Complications or difficulties were not encountered in any patients. This technique allows simultaneous monitoring of perfusion and intrarenal pressure and requires only a single puncture ...
Raju S - - 1991
One hundred thirty-seven limbs with venous obstruction were analyzed. The arm/foot venous pressure differential and reactive hyperemia tests were found to be useful techniques to diagnose and grade venous obstruction. Traditional techniques including venography and ambulatory venous pressure are inferior in this regard. The newer techniques have provided newer insights ...
Bederson J B - - 1991
A model of rat arteriovenous fistula (AVF) was created using a proximal common carotid artery to distal external jugular vein anastomosis. Anatomical dissections revealed that the external jugular vein is the primary vessel draining intracranial venous blood. Physiological measurements were made with the AVF open and closed, and during venous ...
Gogoi S N - - 1991
Twenty-five buffalo calves (age: 14 +/- 1.9 months; body weight: 102 +/- 9.4 kg) were subjected to intravenous regional analgesia (IRA) of the hind limb with 2% lignocaine HCl (4 mg/kg b.w.), infused through the dorsal digital vein. In control animals 15 ml of normal saline was infused. The effect ...
Besarab A - - 1991
Venous pressure measured at the venous bubble trap (VPdm) is a complex function of true intra-access pressure (VP0), hematocrit, needle gauge, and blood flow. In a patient free circuit, needle gauge, hematocrit, and blood flow influenced the pressure drop through the venous return needle. Measured intra-access pressure (VPm) and VPdm ...
Fukui A - - 1991
The pedicled venous flap is used at various sites, such as the finger, forearm, and leg. The authors previously reported that the reasons for the viability of such flaps, based on the digital dorsal vein and used for repairing digital skin defects in the earlier study, were high venous pressure ...
Björnberg J - - 1991
The relation between the capacitance response (regional blood volume mobilization) and the venous resistance response, i.e. the two main functions of the venous system, was investigated during graded sympathetic nerve excitation in cat gastrocnemius muscle under well defined experimental conditions. The neural capacitance response was also compared with the total ...
Chihara E - - 1991
To determine viscoelastic features of the rat hindquarters vasculature, we measured pressure-volume curves. Male Wistar rats were transected at the lumbar level, and the perfused hindquarters were oxygenated with a hollow fiber artificial lung. The blood volume was measured by counting 51Cr-labeled red cells led to a gamma counter through ...
Billett H H - - 1991
Leg ulcers are a well recognized complication of sickle cell disease that has been attributed to venous insufficiency. We studied 16 patients with sickle cell disease and active ulcers using venous pulse volume recordings and photoplethysmography (Doppler studies). Based on hemodynamic monitoring, all 16 patients exhibited rapid refilling times, findings ...
Mukherjee D - - 1991
Noninvasive diagnosis of axillary and subclavian venous thrombosis or documentation of the post-thrombotic syndrome using modalities currently in use is not definitive. Light reflection rheography, which is a reflection of venous pressure changes in the extremity as recorded from the subdermal capillary plexus, was used to correctly diagnose axillary or ...
Muir A L - - 1991
Venodilatation may be an important property in drugs used to treat heart failure. Deductions about venous tone from standard hemodynamic studies may be misleading since filling pressures may be reduced by improved left ventricular function. To study the venodilator properties of drugs, we have modified a radionuclide blood pool method ...
Katahira J - - 1991
The efficacy of a controlled-release topical dosage form of glyceryl trinitrate (Nitroglycerin Transdermal Therapeutic System, Nitroderm TTS, NTG-TTS; CAS 55-63-0) was studied in the experimental model of congestive heart failure in beagles. NTG-TTS suppressed the increase in left ventricular end-diastolic and central venous pressure, and total peripheral resistance resulting from ...
Rosfors S - - 1991
Intramuscular pressures were measured in the anterior tibial muscle with the microcapillary infusion method in 10 patients (11 limbs) with deep venous valvular insufficiency. The results were compared with pressure measurements in healthy controls (n = 8) and in patients with only superficial venous insufficiency (n = 7). The technique ...
Audi S H - - 1991
In this study, we present a new approach for using the pressure vs. time data obtained after various vascular occlusion maneuvers in pump-perfused lungs to gain insight into the longitudinal distribution of vascular resistance with respect to vascular compliance. Occlusion data were obtained from isolated dog lung lobes under normal ...
Raju S - - 1991
Approximately 25% of patients with stasis ulceration have normal or below normal ambulatory venous pressures. A reflux index was calculated by multiplying postexercise pressures by Valsalva-induced foot venous pressure elevation. In patients with stasis ulceration, reflux index was found to have an excellent negative predictive value with a clear discriminant ...
Angelides N S - - 1991
The aim of this study was to understand the possible mechanisms by which deep venous insufficiency and venous hypertension are associated with trophic skin changes and ulceration and to explain the therapeutic effect of Pentoxifylline in patients with leg ulcers due to deep venous incompetence. Twenty patients were included in ...
Ogawa S - - 1991
The authors investigated, in vivo, the effects of four vasodilators on venous tone in dogs. Baseline venous tone was determined from the pressure: diameter relationships in the inferior vena cava (VSIVC) and femoral vein (VSFV) as measured during several seconds of occlusion of the proximal inferior vena cava. All of ...
Cheatle T R - - 1991
Plugging of skin capillaries by activated white blood cells is one of the proposed mechanisms by which skin damage may be initiated in chronic venous insufficiency. The aim of this study was to determine whether a microcirculatory deficit was induced in the skin by raising the venous pressure proximally for ...
West B R - - 1991
Venous congestion is a constant threat in the survival of free flaps, pedicled flaps, tissue replantations and traumatized tissue. Leech therapy has proved effective in salvaging much of these compromised tissues. To be effective, leeches must be both readily available and hungry, requirements not always easily met. Our investigation seeks ...
Liu S L - - 1991
Thirty-two patients in whom Legg-Perthes disease apparently involved only one hip were examined with venography, measurement of intraosseous and intra-articular pressures, arthrography, and dynamic triphasic bone-imaging with 99mTc methylene diphosphonate. The arterial flow of blood in the affected femoral head was slightly decreased, but the difference from that on the ...
Hakim T S - - 1991
To provide a better understanding of analysis of arterial (AO) and venous occlusion (VO) tracings, using a constant and nonpulsatile perfusion pressure system, we set up an isolated in situ dog lobe preparation perfused with autologous blood. Four signals were recorded: arterial pressure, arterial inflow rate, venous pressure, and venous ...
Nielsen H V - - 1991
The relationship between the arterio-venous pressure gradient and blood flow - the Hagen-Poiseuille principle - was reinvestigated. A main theme was to compare transmural pressure changes induced by either changing pressure inside or outside the vessels. Blood flow was measured in subcutaneous and skeletal muscle tissue in the lower limb ...
Rooks M D - - 1991
A two-stage project was developed to study the effect of increased venous pressure on blood flow and survival in microvascular free tissue transfers. A rabbit epigastric fasciocutaneous free flap model was used. The blood flow in the rabbit epigastric free flap is 1.07 +/- 0.06 ml/min. The average venous pressure ...
Cheatle T R - - 1991
The purpose of this study was to examine the effects on the skin microcirculation of a short period of venous hypertension. 34 subjects (17 patients with lipodermatosclerosis and 17 controls) were studied. Laser-Doppler flowmetry was used to assess the hyperaemic responsiveness of the skin following three minutes of ischaemia. This ...
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