Search Results
Results 551 - 600 of 1068
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Silke B - - 1994
The accuracy and precision of the Finapres in recording rest and exercise blood pressure compared with the intra-arterial (aortic and branchial) and random-zero sphygmomanometer methods was assessed in 84 ischaemic patients in three different studies. Firstly, comparison at rest with the aortic intra-arterial pressure in 50 ischaemic patients demonstrated that ...
Caulkett N A - - 1994
Systolic blood pressure measurement obtained with a pulse oximeter has been compared to values obtained by other indirect methods in man. Direct pressure measurement is subject to less error than indirect techniques. This study was designed to compare systolic pressure values obtained using a pulse oximeter, with values obtained by ...
Iyriboz Y - - 1994
OBJECTIVE: The objective of this study is to quantify agreement and differences between blood pressure (BP) measurements by large cuffs (15 x 33 cm) and small cuffs (12 x 23 cm) in a representative sample of the U.S. population with varying arm circumferences. METHODS: The arm circumference and blood pressure ...
Bennett S - - 1994
The measurement of blood pressure in epidemiological studies is difficult to standardize between centres in multi-centre studies and between repeat surveys over time. The use of standard mercury sphygmomanometers is common but especially prone to measurement error in terms of departure from the protocol and variation in measurement technique. Data ...
Belcaro G - - 1994
Laser-Doppler (LDF) skin perfusion pressure was measured and compared with Doppler ankle pressure measurements in 40 normal subjects and 20 patients with rest pain and ankle/foot Doppler pressure lower than 70 mmHg. Six different, commercially available LDF instruments were used. To obtain perfusion pressure a standard blood pressure cuff was ...
Birkett N J - - 1994
The random-zero sphygmomanometer is frequently used in epidemiologic and clinical research to increase the reliability and validity of blood pressure readings. However, recent reports have suggested that there is a correlation between the zero values of a random-zero sphygmomanometer and the zero-corrected blood pressure readings obtained. The design of the ...
Wise R A - - 1994
OBJECTIVE: To determine whether the orally absorbable prostaglandin E1 analog misoprostol might be a suitable treatment for Raynaud's phenomenon (RP). METHODS: We tested the acute effect of a single 400 micrograms oral dose of misoprostol on digital hemodynamics. Eight patients with RP and 6 healthy volunteers were evaluated in a ...
Stroud M A - - 1994
Measurements of digital artery blood pressure made using an automated photoplethysmographic method (Finapres), in the middle finger of the left hands of nine male subjects, were compared with pressure measures in the right brachial artery using a method relying on the abolition of Karotkoff sounds during occlusion of the upper ...
Nelson F E - - 1994
This study was undertaken as an interdisciplinary effort in response to a frequently frustrating clinical problem of interpreting variable blood pressure measurements under uncertain conditions of quality control. The method is an application of the Shewhart Control Chart analysis to blood pressure measurement in adults in an academic nursing center. ...
Bailey R H - - 1993
There are three sources of error in the indirect measurement of blood pressure: (1) observer bias, (2) faulty equipment, and (3) failure to standardize the techniques of measurement. This article examines each area extensively, discusses the cumulative effect of these errors on the accuracy of indirect blood pressure measurement, and ...
Lal S K - - 1993
OBJECTIVE: To test a prototype hydraulic, non-invasive, continuous finger blood pressure monitor based on the volume-clamp principle for procedure-related factors likely to influence precision. DESIGN: The influence of these factors was determined by repeatability of finger blood pressure measurement and the relationship to contralateral arm-cuff blood pressure. METHODS: Repeated blood ...
Hansen F - - 1993
A recently developed ultrasound phase-locked echo-tracking system makes it possible to measure non-invasive pulsatile vessel diameter changes, and, in combination with blood-pressure measurement, to calculate pressure strain elastic modulus (Ep) and stiffness (beta). The reproducibility in measurements of pulsatile diameter changes with this system was evaluated. Also the precision of ...
Ligtenstein D A - - 1993
OBJECTIVE: To assess the applicability of the transtibial route, via a drilled hole in the tibia, for femoral to anterior tibial artery bypass surgery. DESIGN: in a pilot study of 10 patients the preoperative arm/ankle systolic blood pressure indices were compared with those after operation. Patients were followed for 2 ...
Stolt M - - 1993
Fifty-eight patients, 31 women and 27 men, with a wide range of upper arm circumferences (20-43 cm), ages (16-82 years) and body mass indices (16-55 kg m-2) were studied. The direct blood pressure was measured in the brachial artery in one arm and simultaneously the indirect pressure was measured in ...
Levin M E - - 1993
OBJECTIVE: To evaluate the effect of crossing the legs at the knee and the ankle on peripheral arterial pressures. RESEARCH DESIGN AND METHODS: A prospective study of 6 diabetic patients with known peripheral vascular disease and 5 nondiabetic control subjects without peripheral vascular disease was conducted. Peripheral arterial pressures were ...
O'Flynn I - - 1993
This study was designed to determine which method of measuring the brachial systolic blood pressure is most accurate when determining the ankle/brachial index (ABI). The accuracy of the stethoscope diaphragm was compared with the accuracy of the stethoscope bell and Doppler methods in measuring the brachial systolic pressure. These pressures ...
She J - - 1993
All possible combinations of four measurements of blood pressure, blood flow and vascular diameter are examined by transmission-line theory. It is found that only nine measurement combinations can give the attenuation coefficient gamma, reflection coefficient R and characteristic impedance Z0 simultaneously. At least one pressure measurement must be included. Their ...
Tanaka H - - 1993
We examined the effect of temperature on digital arterial blood pressure obtained by continuous beat-to-beat non-invasive monitoring with a volume-clamp technique (Finapres). In 10 normal volunteers and 13 patients with symptoms of vasospasm, digital pressure and brachial artery pressure (cuff method) was simultaneously recorded in control conditions at room temperature, ...
Gardner A W - - 1993
BACKGROUND: Claudication patients who are candidates for exercise can frequently walk to maximal pain without experiencing exaggerated blood pressure and heart rate, as well as other clinical symptoms. However, these concomitant problems are more likely to become apparent as patients age. Consequently, this study compared the claudication and hemodynamic responses ...
Coulshed D S - - 1993
Measurement of action potential duration is made more valuable if it can be made simultaneously with other variables, to which it may be related. We have developed a microcomputer-based system which allows measurement of action potential duration, both for transmembrane action potentials and for monophasic action potentials. The system allows ...
Anderson F D - - 1993
BACKGROUND: Indirect blood pressure measurement is the assessment tool used most frequently in epidemiological studies and hypertension management in the population at large. OBJECTIVE: To review indirect blood pressure measurement within the context of nursing practice. RESULTS: Nurses are not following recommended American Heart Association measurement guidelines. CONCLUSION: A national ...
Ng K G - - 1993
Oscillometric blood pressures are derived from the amplitude envelope of oscillometric pulses generated in an occlusive cuff during cuff inflation or deflation; one factor which will affect the characteristics of these pulses is the size of the cuff bladder. Because limiting values are stipulated in recommendations and standards for bladder ...
Gerin W - - 1993
Cardiovascular reactivity testing is a widely used measure of risk for hypertension and coronary heart disease. Evidence for the reliability of the measures, however, is weak. If the measures (usually change scores) are unreliable, the usefulness of testing is limited, since relationships with other measures, such as disease outcomes, may ...
Jones R D - - 1993
Blood pressure measurements associated with malapplication of a finger cuff were compared with contemporaneous intra-arterial pressure data in seven volunteers to determine the influence of cuff application on the accuracy of the Finapres 2300e. Systolic readings in all cuff positions differed from arterial line data by more than the recommended ...
Cooper, Yvonne R.;
Mean arterial blood pressures were measured peripherally in the upper and lower positions of the right leg, right arm, and left arm by a neonate oscillometric blood pressure machine. They also were compared to the mean arterial pressures measured centrally by an umbilical artery catheter or radial arterial line. The ...
Holleman D R DR - - 1993
The authors measured the blood pressures of 36 subjects who had bare and sleeved arms to determine the effect of wearing sleeves on automatic oscillometric blood pressure measurements. They found no statistically significant effect of sleeves on the measurement of either systolic or diastolic blood pressure (p > 0.15). However, ...
Larsson J - - 1993
The predictive value of distal blood pressure measurements for the level of amputation was studied prospectively in 161 consecutive diabetic patients with foot ulcers. The patients were treated as outpatients except for periods of surgery and when complications requiring hospital care occurred. All patients were treated pre- and postoperatively by ...
Sato T - - 1993
A validation study of the continuous noninvasive tonometric blood pressure monitor called JENTOW was performed in 20 normotensive subjects and 10 hypertensive patients. Tonometric and intra-arterial blood pressures were simultaneously recorded at supine rest and during a Valsalva maneuver and tilting test. The results of the strict evaluation of the ...
Madec F - - 1993
Farrowing disorders in the sow have detrimental consequences in pig farming and many points of the condition still remain obscure. It was suggested to investigate blood pressure since this might provide an early indication of farrowing disturbances. A first study involved 29 pregnant sows. Blood pressure was measured indirectly using ...
Bond V V - - 1993
The application of automated blood pressure measurement during exercise has been limited by inaccuracies introduced by the effects of accompanying motion and noise. We evaluated a newly developed automated blood pressure monitor for measuring exercise blood pressure (Colin STBP-680; Colin, San Antonio, Texas, USA). The STBP-680 uses acoustic transduction with ...
Conroy R M - - 1993
The Hawksley random zero sphygmomanometer is used in all aspects of blood pressure research, from clinical trials to evaluation of new blood pressure recorders. It is designed to reduce observer bias in blood pressure measurement. The problem is that it also underestimates blood pressure. Furthermore, this was first reported more ...
Iwanaga K - - 1993
Threshold of decline in intracellular pH of muscle (pHT) during incremental wrist flexion was studied by 31P-MRS, under two levels of occlusions in which the cuff of the upper arm was inflated to systolic (ES) and diastolic blood pressure (ED), and no occlusion (E). To observe the effect of occlusion ...
Searle N R - - 1993
The N-CAT is a newly developed arterial tonometer (TBP) able to determine systolic, diastolic and mean arterial blood pressures continuously and noninvasively. The aim of this study was to evaluate the accuracy and reliability of TBP relative to directly measured invasive blood pressure (IBP) in ten haemodynamically stable postoperative cardiac ...
Leng G C - - 1993
The purpose of this article is to determine the performance of a reactive hyperemia test in the general population in terms of validity, increase in case identification, and test refusal; and to identify differences between the two major ways of expressing the results (the postocclusive ankle index and the percentage ...
Hasan M A - - 1993
We have compared two non-invasive methods of arterial pressure (AP) measurement used in labour wards: an automatic oscillometric measurement obtained by Dinamap 1846, and a conventional auscultatory measurement obtained by midwives. A total of 369 AP measurements were recorded, involving 28 normotensive and hypertensive pregnant women during labour, with or ...
Sheahan N F - - 1993
It has been suggested that certain artifacts in blood pressure measurement by auscultation stem from stiffness of the tissues underneath the pressure cuff, resulting in a component of cuff pressure being required to overcome resistance to brachial artery collapse. This paper describes a technique for measuring the pressure required to ...
Sheahan N F - - 1993
A technique is described which enables ultrasonic imaging of the brachial artery whilst pressure is applied via a pressure cuff. This involves a new instrument--a sphygmomanometer, which uses water as opposed to air as the pressure medium, in order to permit ultrasonic imaging through the cuff. The technique was found ...
Oliner C M - - 1993
Pseudohypertension is a condition where indirectly determined BP (e.g. via sphygmomanometry) significantly overestimates actual intraarterial pressure. A patient who has a palpable, although pulseless, radial artery while the blood pressure cuff is inflated above systolic pressure, has a positive 'Osler sign'. This 'Osler manoeuvre' has been reported to predict the ...
Baxter G M - - 1993
Peripheral lower limb vascular disease represents a substantial health problem. Arteriography is currently the 'gold standard' imaging modality. However, much effort is presently being channeled towards alternative non-invasive techniques. To date, this involves mainly the interpretation of ankle: brachial pressure indices and segmental pressure measurements. A prospective pilot study of ...
Olsen N - - 1993
The acute effects of unilateral 30 min exposure to hand-arm vibration on the vasoconstrictor response to cold in a finger from both hands were investigated in 12 healthy men (age 18-38 years) who had never worked with vibrating tools. One hand was exposed to accelerations of 4.0 and 16.0 m.s-2 ...
Rabbany S Y - - 1993
Experiments were conducted to examine the accuracy of the conventional auscultatory method of blood pressure measurement. The influence of the physiologic state of the vascular system in the forearm distal to the site of Korotkoff sound recording and its impact on the precision of the measured blood pressure is discussed. ...
Nicholson M L - - 1993
The value of bruits and Doppler ankle pressure measurements as indicators of arterial stenosis was studied in 50 patients with symptoms of lower limb ischaemia. The iliac and femoropopliteal arteries were examined for bruits, ankle systolic pressures were measured before and after an exercise stress test and the results were ...
Stolt M - - 1993
We studied 20 patients with moderate to severe obesity (body mass index 37 +/- 8 kg/m2) with obese arms (arm circumference 37 +/- 4 cm). Their blood pressure was measured directly in the brachial artery in one arm and simultaneously indirectly in the other arm using either a large standard ...
Dewar R - - 1992
The blood pressure in both arms of 103 unselected hemiplegic patients was measured using a random-zero sphygmomanometer. Although for the whole sample the mean blood pressure in the paretic and unaffected arm was similar, a significant difference was found when the patients were subdivided according to the tone of the ...
Virolainen J - - 1992
The aim of this investigation was to evaluate whether reliable estimates of aortic pressure can be derived using non-invasive finger blood pressure monitoring. Finger blood pressure (Ohmeda 2300 Finapres device; Finapres, Englewood, CO) was compared with simultaneous ascending aortic pressure measured with a catheter-transducer system both at rest and during ...
Riach C L - - 1992
This study was designed to investigate the biomechanics of anticipatory postural responses. In particular the aim was to determine whether the centre of pressure of ground reaction forces moves in anticipation of an expected upper limb movement, and if so to determine the pattern (s) of centre of pressure change ...
Muntinga J H - - 1992
In 13 healthy volunteers a computerized experimental set-up was used to measure the electrical impedance of the upper arm at changing cuff pressure, together with the finger arterial blood pressure in the contralateral arm. On the basis of a model for the admittance response, the arterial blood volume per centimeter ...
Carter S A - - 1992
Ankle and toe systolic pressures represent the most convenient and useful measurements in the assessment of limbs with arterial occlusive disease. Each is a sensitive index of the presence and severity of the arterial obstruction and they both correlate with angiographic findings and with the severity of the symptoms. The ...
Allen J A - - 1992
Since vibration white finger (VWF) became a prescribed industrial disease in 1985, objective testing for the diagnosis and grading of the severity of the condition has become desirable. Measurements have been made of finger blood flow and finger systolic pressure before and after cold challenge in 22 healthy control subjects ...
Stolt M - - 1992
This study compares blood pressures measured with a standard cuff (rubber bag 12 x 35 cm) with concomitantly measured intra-arterial pressures in 48 subjects. With the standard cuff, and using a diagnostic cut-off limit for diastolic hypertension of 90 mmHg, 15/48 patients were found to be hypertensive, whereas only 4/48 ...
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