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Results 251 - 300 of 1273
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Tsai Meng-Li - - 2008
We constructed a chassis that tightly fixes catheters for cannulation to the muscle. It can buffer pulling forces to avoid a mechanical tearing of the skin of mice as a result of movement. A simple hydraulic swivel was also made for blood pressure recording and drug infusion in freely moving ...
Kirkpatrick James N - - 2008
Hemodynamics play a crucial role in diagnosing and managing heart failure (HF) as diagnostic markers and therapeutic targets. In an era of declining physical examination skills and questions about the safety of invasive monitoring, quantitative, objective data provided by echo-Doppler measurements can function as a type of "echo Swan-Ganz catheter" ...
Farina Adriano - - 2008
This study evaluates the sound pressure at the ears of users of personal digital audio players, equipped with in-ear earbuds. More than 50 devices were measured, provided by students aged 1518. EN standard 50332 specifies the techniques for measuring the sound pressure level at the ears employing an head and ...
Dickens Paul - - 2008
Although the input impedance of a one-dimensional waveguide is simply defined by the ratio of pressure to volume flow measured at its input, the deficiencies of available transducers require a more complicated approach for precise measurements. These can involve multiple transducers at points within an impedance head connected to the ...
Dalmont Jean-Pierre - - 2008
Our aim was to build a low cost but accurate portable impedance sensor. The adopted technique is the one using a source with a back cavity. A first elctret microphone on the front of the source measures the pressure at the input of the instrument weather a second one measures ...
Schafer Sebastian - - 2008
The number of minimally invasive vascular interventions is increasing. In these interventions, a variety of devices are directed to and placed at the site of intervention. The device used in almost all of these interventions is the guidewire, acting as a monorail for all devices which are delivered to the ...
Allin David D UK Shunt Evaluation Laboratory and Academic Neurosurgical Unit, Addenbrooke's Hospital, Cambridge, - - 2008
The Sophysa Pressio (Sophysa Ltd., Orsay, France) is a new intracranial pressure monitoring system. This study aimed to evaluate its accuracy and compare it with the popular Codman intracranial pressure transducer (Codman/Johnson & Johnson, Raynham, MA) in vitro. A computerized rig was used to test the Pressio and Codman transducers ...
Stergiou George S - - 2008
BACKGROUND: Electronic devices that measure blood pressure (BP) at the arm level are regarded as more accurate than wrist devices and are preferred for home BP (HBP) monitoring. Recently, wrist devices with position sensors have been successfully validated using established protocols. This study assessed whether HBP values measured with validated ...
Donati A - - 2008
BACKGROUND: Both PiCCO and LiDCO can provide dynamic preload parameters, pulse pressure variation (PPV) and stroke volume variation (SVV). The PiCCO device also provides a measure of intrathoracic blood volume index (ITBVI). We investigated the agreement between SVV and PPV, as well as the reliability of LiDCO- and PiCCO-measured SVV, ...
Legendre Daniel - - 2008
A new digital computer mock circulatory system has been developed in order to replicate the physiologic and pathophysiologic characteristics of the human cardiovascular system. The computer performs the acquisition of pressure, flow, and temperature in an open loop system. A computer program has been developed in Labview programming environment to ...
Ellis Timothy - - 2008
The mean pressure is a term used to describe the baseline trend of physiological pressure signals that excludes fluctuations due to the cardiac cycle and, in some cases, the respiratory cycle. In many clinical applications and bedside monitoring devices, the mean pressure is estimated with a 3-8 s moving average. ...
De Greeff Annemarie - - 2008
OBJECTIVE: Noninvasive blood pressure (BP) measurement is dependent on either auscultation or oscillometry. The Tensoval duo control device uses auscultatory and/or oscillometric technology to determine BP. We evaluated the accuracy of this device in adults according to the British Hypertension Society (BHS) protocol and the International Protocol of the European ...
Richez B - - 2008
BACKGROUND: The i-gel is a new single-use supraglottic airway device with a noninflatable cuff and an esophageal vent. METHOD: In this prospective, observational study, we evaluated the i-gel in 71 women. RESULTS: Insertion success rate was 97%. Insertion was easy and performed at the first attempt in every patient. Mean ...
Ginggen Alec - - 2008
A new implantable pressure sensor for long-term monitoring of intracranial pressure is presented. The sensor is powered by telemetry and can be interrogated wirelessly. A capacitive pressure transducer, whose capacitance is converted to a frequency-encoded signal by an application-specific integrated circuit (ASIC), senses the absolute pressure. The pressure-encoded signal, the ...
Yazer Mark H - - 2008
BACKGROUND: Suction pressure is one variable that can affect the efficiency of red blood cell (RBC) recovery for intraoperative autotransfusion. This study compared a constant-suction-pressure system with a device that is expected to minimize hemolysis by automatically varying the suction pressure. STUDY DESIGN AND METHODS: Twenty-two 50-mL reconstituted whole-blood samples ...
Yoshida M - - 2008
The toroidal plasma rotation generated by the external momentum input and by the plasma itself (intrinsic rotation) has been separated through a novel momentum transport analysis in the JT-60U tokamak device. The toroidal rotation, which is not determined by the momentum transport coefficients and the external momentum input, has been ...
Szmuk P - - 2008
A new continuous noninvasive blood pressure measurement device, the T-Line Tensymeter TL100 (Tensys Medical Inc., San Diego, CA, USA) which enables avoidance of arterial cannulation has been developed. We compared the values obtained using the T-Line values to simultaneous arterial line measurements in patients undergoing general anaesthesia with induced hypotension. ...
de Greeff Annemarie - - 2008
OBJECTIVE: Any device intended for blood pressure measurement should be subjected to an independent accuracy assessment. This is particularly relevant to automated oscillometric devices that do not use Korotkoff sounds to identify blood pressure. Various validation protocols have been published with the view of standardizing the acceptable level of accuracy ...
Coleman Andrew - - 2008
BACKGROUND: The Omron M7 (HEM-780-E) is an automated oscillometric upper arm blood pressure monitor for the professional and home use markets. The aim of this study was to validate the accuracy of this device according to the British Hypertension Society (BHS) and the Association for the Advancement of Medical Instrumentation ...
Valentino Daniel J - - 2008
OBJECTIVE: Electromuscular incapacitation (EMI) devices are being used and evaluated by both military and law enforcement agencies. Although the gross muscular response is obvious, physiological responses to these devices are poorly understood. We hypothesized that the intense, repetitive, muscle contractions evoked by EMI devices would cause dose-dependent metabolic acidosis, accompanied ...
Cotte Uwe V - - 2008
OBJECTIVE: Two devices for self-measurement of blood pressure, one at the upper arm (Citizen CH-432B) and one at the wrist (Citizen CH-656C), were evaluated according to the International Protocol of the European Society of Hypertension. DESIGN: The International Protocol is divided into two phases: the first phase is performed on ...
Santoro Antonio - - 2008
The progressive increase in the mean age and the growing conditions of co-morbidity, especially of cardiovascular pathologies and diabetes, have significantly worsened the patients' clinical status and tolerance to the hemodialysis (HD) treatment. On the other hand, the demand for short treatment times enhances the risk for hemodynamic instability as ...
Matowe Wandikayi C - - 2008
OBJECTIVE: To determine the types of devices for self-monitoring of blood pressure available to consumers in Kuwait and the pharmacists' knowledge and level of information provided to consumers when purchasing such devices. MATERIALS AND METHODS: It was possible to contact 196 of the 230 eligible pharmacies from five governorates in ...
Sati Rohit - - 2008
Extensive use of pressurized steam in the oil and gas sectors has led to incidents where workers were seriously injured. In this study a test device and procedure to measure heat transfer through fabrics during steam exposure were developed and evaluated. Several factors were considered while designing the test device ...
Bowers Linda - - 2008
In this prospective, randomized study of 102 subjects with single-lumen peripherally inserted central catheters with positive pressure Luer-activated devices, 2 flushing solution groups were compared for their effect on occlusion rates. Of the 50 subjects randomly assigned to the normal saline group, 3 (6%) experienced occlusions, all of whom were ...
Lee Yong W - - 2008
High-frequency chest compression (HFCC) is shown to enhance clearance of pulmonary airway secretions. Several HFCC devices have been designed to provide this therapy. Standard equipment consists of an air pulse generator attached by lengths of tubing to an adjustable, inflatable vest/jacket (V/J) garment. In this study, the V/Js were fitted ...
Amoore John N - - 2008
OBJECTIVE: To explore the differences between oscillometric and auscultatory measurements. METHOD: From a simulator evaluation of a non-invasive blood pressure (NIBP) device regenerating 242 oscillometric blood pressure waveforms from 124 subjects, 10 waveforms were selected based on the differences between the NIBP (oscillometric) and auscultatory pressure measurements. Two waveforms were ...
Li Li - - 2008
Extensive marketing of devices for self-measurement of blood pressure has created a need for purchasers to be able to satisfy themselves that such devices have been evaluated according to agreed criteria. The Oregon Scientific BPU 330 blood pressure monitor is an electronic device for upper arm measurement. This study assessed ...
Zimmermann D - - 2008
A high-precision pressure probe is described which allows non-invasive online-monitoring of the water relations of intact leaves. Real-time recording of the leaf water status occurred by data transfer to an Internet server. The leaf patch clamp pressure probe measures the attenuated pressure, P(p), of a leaf patch in response to ...
Shoffstall Andrew J - - 2008
The objective of this study was to test a custom device aimed at increasing repeatability of abdominal leak point pressure (LPP) measurements in rodents. The device consisted of a soft-tipped force applicator with a force sensor which was moved in the vertical direction by a linear actuator, laser crosshairs for ...
Chambers I R IR The James Cook University Hospital, Marton Road, Middlesbrough TS4 3BW, UK. - - 2008
There is considerable interest in surgical decompression as a management strategy (RescueICP) for intractable intracranial hypertension. After such an operation measurements of intracranial pressure (ICP) and thus cerebral perfusion pressure (CPP) become less meaningful. Measurements of the biomechanical properties of the brain may be one measure capable of detecting changing ...
Pinheiro Eduardo C EC Setúbal's Superior School of Technology, Campus do Instituto Politécnico de Setúbal Estefanilha, 2650-761 Portugal. - - 2008
Oscillometric blood pressure monitors are fairly reliable medical equipment, inexpensive and widely used both in domicile and clinical measurements of blood pressure, however they have not yet been subject of deep investigation. The research reported in this paper presents the development of an analytical model of an oscillometric blood pressure ...
Pinheiro Eduardo C EC Setúbal's Superior School of Technology, Campus do Instituto Politúcnico de Setúbal Estefanilha, 2650-761 Portugal. - - 2008
Oscillometric blood pressure monitors are fairly reliable medical equipment, inexpensive and widely used both in domicile and clinical measurements of blood pressure, however they have not yet been subject of deep investigation. The research reported in this paper presents some a priori knowledge to build a model of an oscillometric ...
McCombie Devin B DB Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. - - 2008
This paper presents a novel adaptive algorithm for calibrating non-invasive pulse transit time (PTT) measurements to arterial blood pressure (BP). This new algorithm allows complete calibration of PTT to BP without the use of an oscillometric blood pressure cuff or external pressure sensor. Further, the algorithm can be used to ...
Hartley Craig J CJ Sections of Cardiovascular Sciences & Geriatrics, Dept. of Medicine, Baylor College of Medicine, TX, - - 2008
Mice are becoming more common as research models, and several companies now manufacture sensors and instrumentation to measure left ventricular (LV) pressure and volume in mice. It is often assumed that pressure is easier to measure than volume, and that all sensors perform similarly, but there are differences. We measured ...
Bern Linda - - 2007
Measurement of blood pressure is done frequently in hospitalized patients with an automated, noninvasive blood pressure device. While manufacturers have made significant design improvements which may have improved the accuracy of these devices, limited research is available on their performance in clinical practice. The purpose of this study was to ...
Rahman S - - 2007
The present study examines the effects that temporal and spatial averagings due to finite size and finite response time of pressure transducers have on the pressure measurements in blast wave flow fields generated by milligram charges of silver azide. In such applications, the characteristic time and length scales of the ...
O'Brien Eoin - - 2007
Inaccurate blood pressure measurement leads inevitably to the inappropriate diagnosis and treatment of hypertension with resultant disadvantages for patients. Despite the serious consequences of inaccurate measurement of blood pressure the fact is that there are many inaccurate devices in the market and many have not been validated independently for accuracy. ...
Aota Yoichi - - 2007
STUDY DESIGN: Subjective ratings of discomfort were compared between a fixed lumbar support and lumbar support continuous passive motion (CPM) device. OBJECTIVE: To compare a fixed lumbar support with a lumbar support CPM device during prolonged sitting. SUMMARY OF BACKGROUND DATA: To prevent low back pain during prolonged sitting, an ...
Loeffel Mario - - 2007
A novel computer-assisted injection device for the delivery of highly viscous bone cements in vertebroplasty is presented. It addresses the shortcomings of manual injection systems ranging from low-pressure and poor level of control to device failure. The presented instrument is capable of generating a maximum pressure of 5000 kPa in ...
Parikh Bijal R - - 2007
BACKGROUND: It is rapidly becoming the standard of care to employ the perioperative use of intermittent pneumatic compression (IPC) devices on the lower leg to prevent the development of deep venous thrombosis. There are instances when the anesthesiologist must apply a blood pressure cuff to the ankle in order to ...
Chang Dustin S - - 2007
Microfluidic systems often use pressure-driven flow to induce fluidic motion, but control of pumps and valves can necessitate numerous external connections or an extensive external control infrastructure. Here, we describe an electronically controlled pressure microregulator that can output pressures both greater and less than atmospheric pressure over a range of ...
Weibel Douglas B - - 2007
This paper demonstrates a methodology for storing and pumping fluids that provide a useful capability for microfluidic devices. It uses microfluidic screw valves to isolate fluids in poly(dimethylsiloxane) (PDMS) microcompartments, in which the pressure of the liquid is stored in the elastic deformation of the walls and ceiling of the ...
George Robert S - - 2007
BACKGROUND: Assessment of myocardial recovery during left ventricular assist device (LVAD) support is difficult to perform both safely and effectively. We developed a test involving short-term interruption of LVAD support with measurements of several hemodynamic and echocardiographic parameters at rest and, whenever possible, after exercise, to investigate inotropic reserve. METHODS: ...
Alpert Bruce S - - 2007
OBJECTIVES: To validate a significantly lower priced, new-generation blood pressure device by using the ANSI/AAMI SP10:2002 Standard evaluation. METHODS: The Spot Vital Signs device evaluation was performed using the procedure specified in the SP10: 2002 American National Standard. Both obese and hypertensive participants were overrepresented in the study population. RESULTS: ...
Siewiorek Gail M - - 2007
PURPOSE: To assess in vitro the performance of 5 distal protection devices (DPDs) by evaluating the capture efficiency, pressure gradient, volume flow rate, and vascular resistance in the internal carotid artery (ICA). METHODS: The time-averaged mean peak velocity in the common carotid artery and a blood-mimicking solution were used to ...
Fonseca-Reyes Salvador - - 2007
BACKGROUND: We compared the Omron 725 CIC device (Omron Healthcare Inc., Vernon Hills, Illinois, USA), which is designed to register the blood pressure on the arm, with a mercury sphygmomanometer. In addition, we evaluated the possible impact that this device might have on the decisions made in a hypertension clinic. ...
Viera Anthony J - - 2007
OBJECTIVE: We tested the accuracy of the HEM-780REL automatic blood pressure monitor with Easy Wrap Cuff. METHODS: We used the International Protocol for validation of blood pressure measuring devices developed by the Working Group on Blood Pressure Monitoring of the European Society of Hypertension. Thirty-three adults over the age of ...
Hess P - - 2007
The pro-arrhythmic risk inherent to a new drug must be assessed at an early preclinical stage. Telemetry system implantation is a method widely used in vivo in various species. The present study was designed to assess whether conscious freely moving guineapigs can be used to predict QT prolongation in vivo. ...
Schellenberg S - - 2007
To evaluate the effect of an adaptation period on systemic blood pressure readings, systolic blood pressure was measured in 12 young adult untrained beagles over several weeks by means of a Doppler flow detector and oscillometric devices. The pressure decreased gradually and significantly, and levelled out after 14 days. The ...
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