Search Results
Results 501 - 550 of 1068
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Geake W B - - 1995
Most of the automated non-invasive blood pressure (NIBP) monitors in clinical use rely on the oscillometric technique for measuring the blood pressures. The functional evaluation of these monitors has relied on comparison with intra-arterial blood pressure measurements or comparison with 'standard' non-invasive blood pressure meters such as the Hawksley random ...
Foldes M S - - 1995
Surveillance is essential to the postoperative follow-up of lower extremity bypass grafts. Early, intermediate, and late thrombosis place the patient's limb at risk, so detection of problems before the graft fails is critical. Because contrast angiography is not routinely performed for surveillance, most vascular surgeons rely on history, physical examination, ...
Wingfield D - - 1995
Terminal digit preference is a well-known source of error in blood pressure measurements. This was demonstrated in general practice computer databases by conducting a routine search and constructing a frequency distribution of the 20 992 blood pressure readings using mathematical software for a personal computer. The charts produced have a ...
Lal S K - - 1995
Because of the clinical and experimental utility of continuous finger blood pressure measurements and the need for accuracy, we tested the performance of a new hydraulic device in 22 consecutive hypertensive subjects during physiological and pharmacological interventions. Ipsilateral brachial intra-arterial pressure was monitored during rest, Valsalva's maneuver, static handgrip, and ...
Abraham P - - 1995
Although the ratio of ankle-to-arm systolic pressures (AAI) at rest is widely used in the clinical diagnosis of peripheral arterial disease, the heart rate (HR) at which the measurements are performed is rarely reported. The relation of ankle-to-arm index (AAI) to HR was studied in a normal population (n = ...
Fischer M - - 1995
OBJECTIVE: To assess feasibility of a new technique for simultaneous measurement of digital artery and skin perfusion pressure at the same digit using the laser Doppler method and to measure the pressure gradient between the two vessel compartments in controls and patients with peripheral arterial occlusive disease. DESIGN: A pressure ...
Gains M J - - 1995
The precision and accuracy of an indirect oscillometric blood pressure measurement technique (Dinamap 8100) was assessed in 11 anesthetized Beagle dogs weighing 8 to 11.5 kg. Direct blood pressure measurements were made by catheterization of the lingual artery, and simultaneous indirect measurements were determined by placing a cuff over the ...
Axton S E - - 1995
PURPOSE: To compare brachial and calf blood pressures in infants under one year of age using the same size blood pressure cuff. METHODOLOGY: A convenience sample of 79 infants ages 4-300 days was selected from the General Pediatric, Pediatric Special Care, and Pediatric Intensive Care units in an acute care ...
Sun M - - 1995
This study describes a method for noninvasive hydrostatic validation of blood pressure devices. It is based on the hydrostatic pressure exerted by a column of blood. The mid-position of an upward-held wrist blood-pressure cuff marks the top of the column, and a cuff on the opposite wrist pointed downward similarly ...
Franklin C M - - 1995
When arterial cannulation is required, but the radial artery cannot be used, five alternatives can be considered: the ulnar, brachial, axillary, femoral, and dorsalis pedis arteries. Of these, the dorsalis pedis may be the next best choice: Collateral flow is excellent, and cannulation here is easy to perform, presents minimal ...
Muntinga J H - - 1995
Studies concerning vascular changes in hypertension and exercise have shown an increasing need to investigate the properties of a complete vascular bed in vivo. In this study, the repeatability of a non-invasive method for quantifying properties of the vascular bed of an upper arm segment, was investigated in two groups ...
Low J A - - 1995
The objective of this study was to determine the validity of oscillometric blood pressure in relation to arterial blood pressure. Thirty-one newborns were studied. Clinical characteristics, complications, and treatment interventions were documented. Arterial pressure (every 2 sec) and oscillometric pressure (every 3 min) were concurrently recorded for 1-2 h. Serial ...
Desvaux B - - 1995
Although recent studies have compared the effect of progressive exercise tests to constant moderate work load tests on ankle systolic blood pressure (ASBP) and ankle to arm index (AAI) in claudicants, little is known about the relation of ASBP and AAI to work load in healthy young men. Fifteen normal ...
Parry T - - 1995
The differences in simultaneous arterial pressure measurements from the radial and dorsalis pedis arteries were studied in anaesthetised adult patients in either the horizontal or reverse Trendelenburg position. Significantly higher pressures were measured from the dorsalis pedis artery than from the radial artery in both positions, even allowing for the ...
Lindqvist A - - 1995
The aim of this study was to investigate and quantify the agreement between simultaneous and ipsilateral non-invasive finger artery blood pressure (Finapres) and intra-arterial radial blood pressure among 13 volunteer hypertensive patients, aged 36-71 years and taking cardiovascular medication, during steady-state fluctuation of arterial blood pressure and during an increase ...
Whitcomb B L - - 1995
OBJECTIVE: To evaluate the Vita-Stat automated blood pressure computer (a patient-operated blood pressure measuring device available in the community) to determine its value as an instrument to monitor blood pressure in the ambulatory patient. DESIGN: Comparative study using the Vita-Stat vs a gold standard, the mercury sphygmomanometer. SETTING: Three local ...
Payne S P - - 1995
OBJECTIVE: To discover if limb swelling occurs after successful revascularisation by percutaneous transluminal angioplasty (PTA). DESIGN: Prospective Study. SETTING: Vascular Laboratory. MATERIALS: Twenty-five patients with occlusive arterial disease of the lower limb revascularised by percutaneous transluminal angioplasty were studied. CHIEF OUTCOME MEASURES: The ankle/brachial pressure index and foot volumes measured ...
Menard S W - - 1995
Blood pressure measurement in children is difficult and many inaccuracies are seen because of the method of measurement of the blood pressure cuff and the choice of apparatus with which to measure the blood pressure. This article will briefly review the ways in which blood pressures are measured in children ...
Carney S L - - 1995
Periodic evaluation over the past 20 years of the ability of clinical staff to accurately measure blood pressure, as well as the functional state of sphygmomanometers, has frequently demonstrated significant deficiencies. The data presented here are the results of a recent audit in the Newcastle area. Medical (48) and nursing ...
Ling J - - 1995
OBJECTIVE AND METHODS: A noninvasive blood pressure monitor (model BP8800MS, Colin Medical Instruments Corp., San Antonio, TX) that uses the oscillometric principle was evaluated against the manual auscultatory method in 85 adults and 85 children following the requirements of the 1992 AAMI SP-10 standard. This was the first evaluation study ...
Ursino M - - 1995
The main biomechanical factors which may affect the accuracy of the oscillometric method for indirect blood pressure measurement are analyzed using a new model of brachial hemodynamics. In a first stage of this work, the model has been used to reproduce some well-known responses of collapsing arteries, such as the ...
van Genderingen H R - - 1995
A computer simulation of a catheter manometer system was used to quantify measurement errors in neonatal blood pressure parameters. Accurate intra-arterial pressure recordings of 21 critically ill newborns were fed into this simulated system. The dynamic characteristics, natural frequency and damping coefficient, were varied from 2.5 to 60 Hz and ...
Ursino M - - 1995
A mathematical model of the arm tissue mechanical behavior under the effect of external pressure loads is presented. The model has been used to study stress and strain distribution across the tissue, and pressure transmission to the brachial artery, when the arm is compressed by two adjacent cuffs independently inflated. ...
De Jong J R - - 1995
The objective of the study was assess the utility during anaesthesia of noninvasive continuous blood pressure measurement techniques which use intermittent oscillometric blood pressure measurement for their calibration. The assessment was performed by comparing noninvasive blood pressure with intra-arterial blood pressure. The noninvasive blood pressure measurement device used for evaluation ...
Sakurada S - - 1995
The present study was performed to investigate the mechanism of heat-induced vasoconstriction (HIVC) in human fingers. The left fingers of five male subjects were immersed in water controlled at an initial temperature of 35.0 degrees C. The blood flows (BF) of the left index and fourth fingers were measured continuously ...
Mac Mahon M - - 1995
BACKGROUND: Pseudohypertension has frequently been reported in the elderly population, with the diastolic measurement being the most frequent source of error. There is no satisfactory noninvasive method of calculating the error in the blood pressure reading. We investigated the role of arterial closing pressure in the diagnosis of diastolic pseudohypertension. ...
Lindsell C J - - 1995
Finger systolic blood pressure measured after cold provocation and ischemia of a digit is used to assist in the diagnosis of vibration-induced white finger, VWF. A reduction in finger systolic blood pressure after cooling is assumed to indicate vascular dysfunction. The percentage pressure change observed in the tested finger is ...
Bovenzi M - - 1995
The aim of this experimental study was to investigate the pathophysiological mechanisms involved in the acute effects of unilateral vibration on the digital circulation of healthy men. In the fingers of both hands of eight male subjects (age 23-47 years) who had never worked with vibrating tools, finger blood flow ...
Hynson J M - - 1994
BACKGROUND: A decrease in radial artery blood pressure relative to central arterial blood pressure is commonly associated with the rewarming phase of cardiopulmonary bypass. Decreased hand vascular resistance has been suggested as a possible mechanism. Although decreased blood viscosity due to hemodilution may contribute to decreased hand vascular resistance, thermoregulatory ...
Lewis R R - - 1994
Indirect (cuff) and direct (intra-arterial) BPs were measured in 15 normotensive (mean age 79 years, range 72-88 years) and 21 hypertensive (mean age 76 years, range 65-89 years) elderly patients. Osler's test and arm arterial compliance, measured using Doppler-shifted ultrasound, were also assessed. In the normotensive, cuff systolic pressures were ...
Wilkes M P - - 1994
We have compared arterial pressures measured by an indwelling radial cannula with those obtained non-invasively by the Finapres 2000 (Ohmeda) during spinal anaesthesia for lower segment Caesarean section. The digital outputs of both pressures were recorded using a computerized system. We studied 20 patients, yielding a total of 18,772 data ...
Bovet P - - 1994
In this study we determine whether blood pressure readings using a cuff of fixed size systematically differed from readings made with a triple-bladder cuff (Tricuff) that automatically adjusts bladder width to arm circumference and assessed subsequent clinical and epidemiological effects. Blood pressure was measured with a standard cuff or a ...
Bodey A R - - 1994
Oscillometric measurements of arterial blood pressure were compared with direct measurements in anaesthetised dogs being monitored during routine surgery. Readings were obtained with tail cuffs and limb cuffs and the reproducibility (precision) of the readings from various cuff sites was also compared in conscious dogs. Tail cuffs gave the best ...
Sapinski A - - 1994
OBJECTIVE: The objective of this study was to compare blood pressure (BP) measured by the sphygmooscillographic method with that measured by the direct and auscultatory methods. METHODS: In 15 adult patients undergoing cardiac surgery, blood pressure was measured by the sphygmooscillographic and direct methods simultaneously on the same upper extremity. ...
Lyew M A - - 1994
Arterial blood pressure measurements (y) obtained from forefinger cuffs were compared with standard arm cuff readings (x) in 41 anaesthetised children and young adults. Mean (SD) differences between cuff measurements were -0.21 (9.15), -1.56 (10.2) and 1.23 (9.12) mmHg for the systolic, mean and diastolic pressures respectively. The correlation for ...
Nash C A CA Division of Hypertension and Internal Medicine, Mayo Clinic Rochester, MN - - 1994
To describe the techniques for assessing the accuracy of digital sphygmomanometers. The necessary equipment and the recommended procedures for determining the accuracy of digital units by comparison with a mercury sphygmomanometer were reviewed. Evaluation of the accuracy of digital sphygmomanometers is a simple two-phase process: (1) comparison of the pressure ...
Conroy R M - - 1994
We combined a database of paired blood pressure measurements taken using the Hawksley random-zero sphygmonanometer and a standard mercury sphygmomanometer and a database of paired measurements made on a SpaceLabs 90202 ambulatory blood pressure recorder and standard sphygmomanometer to determine how the SpaceLabs 90202 would have fared if it had ...
Rithalia S V - - 1994
Non-invasive oscillometric blood pressure and pulse measured by an Omron HEM-703CP monitor were compared with arterial values obtained from direct measurements of the radial artery. An excellent correlation and agreement was found between the two methods (systolic r = 0.99; diastolic r = 0.97; pulse r = 0.99), although there ...
Kurozawa Y - - 1994
First toe systolic blood pressures (FTSBP) before and after first toe cooling were measured with the laser Doppler method in 17 normal women and 10 female patients with primary Raynaud's phenomenon (PRP). The room temperature was maintained at 26 degrees C. There was no significant difference in toe-arm systolic blood ...
Siegel L C - - 1994
BACKGROUND: Arterial tonometry has been introduced for continuous noninvasive measurement of blood pressure. The accuracy of this method depends on the performance of two components: a piezoelectric crystal array and an oscillometric cuff. This study evaluates overall performance of arterial tonometry in terms of the performance of these two components ...
Campbell N R - - 1994
This article reviews the current recommendations on equipment when blood pressure is measured by sphygmomanometer. The scientific rationale underlying the current recommendations for selection and maintenance of blood pressure measuring equipment is presented. The errors that can occur when the recommendations are not followed are quantified whenever the data are ...
Maricq H R - - 1994
OBJECTIVE: To compare digital vascular responses to local finger cooling in 4 groups of subjects: patients with definite scleroderma (SD, systemic sclerosis) meeting ARA criteria (n = 16), patients with suspected early SD (n = 12), patients with primary Raynaud's phenomenon (RP) (n = 23) and a control group of ...
Silverman D G - - 1994
BACKGROUND: Cutaneous laser Doppler flowmetry enables monitoring of changes in skin perfusion by quantifying the phase shift of laser light induced by moving red blood cells under a fiberoptic probe. It thus can identify the presence of and response to a vasoconstrictive stimulus. However, aspects of the technique must be ...
Smith F C - - 1994
Ankle-branchial pressure indices (ABPIs), measured by sphygmomanometer and Doppler probe, are an accepted index of chronic leg ischaemia. However, tibial artery sclerosis or calcification decreases compliance, producing falsely elevated cuff occlusion pressures. Arterial cannulation is invasive and impractical, but by elevating the foot and measuring the height at which the ...
Kugler J - - 1994
OBJECTIVE: Sphygmomanometric recordings of blood pressure are a standard technique in clinical practice. We investigated whether arm-cuff inflation can induce short-term blood pressure changes ('cuff-inflation hypertension'), limiting the generalizability of recordings. METHODS: Progress in biomedical methodology makes it feasible to monitor blood pressure continuously and non-invasively at the finger artery ...
Urzua J - - 1994
OBJECTIVE: Thermoregulatory vasoconstriction locally increases arterial wall tension and arteriolar resistance, thereby altering physical properties of the arteries. The arterial pressure waveform is an oscillatory phenomenon related to those physical characteristics; accordingly, we studied the effects of thermoregulatory vasomotion on central and distal arterial pressures, using three hydraulic coupling systems ...
Yamakoshi K - - 1994
An improved technique based on the electrical admittance cuff was designed for the non-invasive measurement of haematocrit (Hct), together with blood pressure (BP) and arterial elasticity represented as volume elastic modulus (Ev), in human fingers. This device is made of a rigid annular chamber installed with a surrounding thin-walled tube ...
Tanaka H - - 1994
We evaluated the performance of continuous non-invasive finger arterial pressure measurement using the volume-clamp technique (Finapres). This study was designed to compare finger arterial pressure with brachial blood pressure estimated by the auscultatory method in 217 children (90 boys and 127 girls) aged 4-16 years and in 38 adults (aged ...
van Bemmelen P S - - 1994
This study was designed to investigate the effect of intermittent calf compression on popliteal arterial blood flow and to see how flow is influenced by position of the subject and by arterial blood pressure at the ankle. Volume flow in the popliteal artery of subjects in the sitting and prone ...
Ramsay M M - - 1994
1. Doppler recordings were made from the brachial artery of healthy female subjects during a series of manoeuvres which altered the pressure-flow characteristics of the vessel. 2. Changes were induced in the peripheral circulation of the forearm by the application of heat or ice-packs. A sphygmomanometer cuff was used to ...
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