Embolization of a portion of the nidus of an arteriovenous malformation not only may alter hemodynamics within the nidus, but also may change blood flow dynamics in adjacent normal vessels. Sequential acetazolamide-challenge xenon CT cerebral blood flow studies were performed in eight patients before and after embolization of arteriovenous malformations to ...
Energy Citations Database
Acetazolamide increases cerebral blood flow. The generalized and regional changes in blood flow after administration of acetazolamide were evaluated by the xenon-133 inhalation technique in a series of patients with subacute or chronic focal cerebral ischemia. Acetazolamide augmented interhemispheric asymmetry of ...
Carotid balloon test occlusion (BTO) is used to assess the collateral circulation and cerebrovascular reserve in patients in whom carotid artery occlusion is contemplated. Eight patients in whom the test was successful were evaluated with perfusion computed tomography (CT) in the resting state and after acetazolamide challenge. Three of the patients showed ...
PubMed
The aim of this study was to develop a new method for quantifying regional cerebral blood flow (rCBF) with technetium-99m ethyl cysteinate dimer (ECD) and single-photon emission tomography (SPET). Employing a three-compartment model, we introduced a parameter, regional brain fractionation index (BFI), that reflects rCBF values and is obtained by a single SPET scan at optimum time T (min) after ...
Direct revascularization has been used successfully to prevent strokes by improving regional cerebral blood flow (rCBF) to the affected hemisphere faster in patients with moyamoya disease (MMD). Since most literatures have focused on the rCBF changes of operative hemisphere, we evaluated the hemodynamics of nonoperative side by xenon-enhanced computed tomography (Xe-CT) and ...
cortex of eight rats at baseline and after acetazolamide challenge. Trigeminal nerve stimulation.49 � 0.03 mL � min-1 � mL-1 at rest, after acetazolamide challenge, and during trigeminal nerve branch of the trigeminal nerve was stimulated with two stainless steel electrodes. The cathode
E-print Network
We compared three-dimensional time-of-flight MR angiograms obtained before and after acetazolamide administration to evaluate whether use of this drug could improve visualization of small peripheral intracranial arteries and atherosclerotic stenosis. For evaluation of small peripheral arteries, 10 patients with clinical diagnosis of ischemic cerebrovascular disease and 10 ...
The acetazolamide (ACZ) challenge test is a useful clinical tool and a reliable predictor of critically reduced perfusion. In patients with chronic steno-occlusive disease, the ability to maintain normal cerebral blood flow by reducing vascular resistance secondary to autoregulatory vasodilation is compromised. Identification of the presence and degree of ...
To evaluate changes in cerebral hemodynamics and metabolism induced by acetazolamide in healthy subjects, positron emission tomography studies for measurement of cerebral perfusion and oxygen consumption were performed. Sixteen healthy volunteers underwent positron emission tomography studies with 15O-gas and water before and after intravenous administration of ...
The role of the ophthalmic artery (OA) as a collateral to the cerebral circulation in carotid occlusive disease is somewhat controversial. The aim of this study was to assess the importance of this collateral by comparing the results of transorbital Doppler ultrasonography and regional cerebral blood flow measurements using SPECT and Xenon-133 inhalation in 41 patients with ...
We investigated 15 patients with one or more transient ischemic attacks (TIAs) in the internal carotid artery territory within the month following the most recent TIA. Cerebral blood flow (CBF) was measured by single-photon emission computed tomography, using intravenous xenon-133 before and after injection of 1 g acetazolamide. Six patients had severe ...
A study of cerebral and cerebellar blood flow reactivity to acetazolamide by xenon-133-inhalation single photon emission computed tomography (/sup 133/Xe SPECT) was carried out in a patient with bouts of transient basilar ischemia, whose neurological examination, computed tomographic scan, and auditory evoked potentials were normal. Though the patient was ...
We have studied regional cerebral blood flow (= test) and reactivity of acetazolamide injection (= retest) in 20 patients who had presented transient ischemic attacks (TIA). The cerebral blood flow was measured by the atraumatic Xenon 133 inhalation method and single photon emission tomography using a specially dedicated tomograph (TOMOMATIC 64), allowing ...
The aim of this prospective study was to investigate whether decreased cerebrovascular reactivity to acetazolamide, as determined by single-photon emission computed tomography (SPECT), is an independent predictor of the 5-year risk of subsequent stroke in patients with symptomatic major cerebral artery occlusion. Cerebrovascular reactivity to acetazolamide ...
... and various xenon ion charge states is concentrated in the blue and near ... engineers who have not yet been introduced to electric plasma thrusters ...
DTIC Science & Technology
...2011-04-01 2011-04-01 false Sterile sodium acetazolamide. 522.44 Section 522...NEW ANIMAL DRUGS § 522.44 Sterile sodium acetazolamide. (a) Specifications. Sterile sodium acetazolamide contains...
Code of Federal Regulations, 2011
21 Food and Drugs 6 2010-04-01...2010-04-01 false Sterile sodium acetazolamide. 522.44 ...DRUGS § 522.44 Sterile sodium acetazolamide. (a) Specifications. Sterile sodium acetazolamide contains...
Code of Federal Regulations, 2010
... acute mountain sickness: a prospective, double-blind, randomized, ... Table 2. Effect of lectures on the understanding of acetazolamide's ( ... ...
NBII National Biological Information Infrastructure
... Title : Effect of Acetazolamide on Leg Endurance Exercise at Sea Level and Simulated Altitude. Descriptive Note : Journal article. ...
... Title : Effect of Acetazolamide on Isolated Quadriceps Muscle Endurance Performance at Sea Level and During Acute Altitude Exposure. ...
... Accession Number : ADA168074. Title : Acetazolamide and ADH, Renin, Aldosterone, and Water Electrolytes at 4100 M in Man,. ...
... Accession Number : AD0287075. Title : ADDITIVE EFFECTS OF ACETAZOLAMIDE AND FAT EMULSION ON THE AA B(CO2) DIFFERENCE. ...
Three patients, two women and one man, aged 56-70 year (mean 59 years) with modest neurological deficits and bilateral occlusion of the common carotid arteries initially identified by duplex scanning and angiography were followed by repeated clinical and transcranial Doppler examination (TCD) over 6.5 years. Vasomotor reactivity (VMR) was tested by combined examination of TCD and ...
... frequent in porters taking acetazolamide than in the placebo group (P = .0001), but there were no serious side effects. Conclusions.�Acetazolamide was tolerable, but impractical for the ... ...
This article reviews the progress made over the last 20years in the development and applications of liquid xenon detectors in particle physics, astrophysics, and medical imaging experiments. A summary of the fundamental properties of liquid xenon as radiation detection medium, in light of the most current theoretical and experimental information is first ...
NASA Astrophysics Data System (ADS)
It is well established that patients presenting for orthotopic liver transplantation pose challenging surgical and anesthesiological problems. Intraoperatively, severe hemodynamic instability due to profuse bleeding and acute cardiomyopathy during reperfusion are major concerns. In addition, ischemia-reperfusion injury can compromise postoperative graft function. ...
The next generation of WIMP dark matter searches using liquid xenon as a target medium will require unprecedented rejection of residual krypton contamination. Krypton contains the beta emitting isotope ^85Kr, with a relative abundance of about 10-11 (^85Kr/^natKr), and this beta decay can be an important source of background for these experiments. Krypton is typically present ...
In order to increase our understanding of the nasal response to cold, dry air (CDA), we studied changes in xenon clearance as an indicator of nasal blood flow. Eight individuals previously shown to respond to CDA had measurements of xenon clearance made in the left inferior turbinate before, during, and after a 15-minute exposure to either CDA (-7 degrees ...
... Title : NEW LINES IN A PULSED XENON LASER,. ... Descriptors : (*LASERS, XENON), (*LINE SPECTRA, XENON), LIGHT PULSES. ...
... Title : THE SYSTEMS XENON HEXAFLUORIDE - GERMANIUM TETRAFLUORIDE AND XENON HEXAFLUORIDE - SILICON TETRAFLUORIDE. ...
Cerebral blood flow (CBF) was measured by xenon-133 inhalation tomography in 18 patients with cerebrovascular disease before and 4 months after extracranial-intracranial bypass surgery. Only patients who showed a reduced CBF in areas that were intact on the CT scan and relevant to the clinical and angiographical findings were operated. The majority of the patients had suffered ...
Changes in cerebral blood flow (CBF) were measured using the radioactive xenon technique and were related to the development of acute mountain sickness (AMS). In 12 subjects, ascending from 150 to 3,475 m, CBF was 24% increased at 24 h (45.1 to 55.9 initial slope index (ISI) units) and 4% increased at 6 days (47.1 ISI units). Four subjects had similar increases of CBF when ...
Effective long-term storage remains a significant challenge to the use and development of protein pharmaceuticals. We have investigated the interactions between clathrate hydrates and model protein solutions to determine the effects on hydrate formation. Here, the dissociation curve and equilibrium conditions for xenon clathrate hydrate with model lysozyme ...
Although different techniques are used to search for the neutrinoless double beta decay, the common challenges for all the existing or planned experiments are to achieve a good energy resolution and large background rejection factors. The NEXT collaboration addresses these two challenges with a high-pressure gas-Xenon TPC. Natural ...
A number of diagnostic tools have been developed over the past decade that facilitate the noninvasive evaluation of cerebral ischemia. From duplex Doppler ultrasound to xenon computed tomography and magnetic resonance angiography, a greater trend toward combining both anatomic and function information is anticipated. The methodology, limitations, and current clinical ...
... Xenon Fluoride and Mercury Chloride Photodissociation Lasers. ... Xenon, Fluorides, Mercury compounds, Chlorides, Optical pumping ...
... Title : XENON. VOLUME 1. ... Citations on Xenon Lamps have been excluded and will appear at a later date in separate volumes. ...
Liquid-xenon based particle detectors have been dramatically growing in size during the last years, and are now exceeding the one-ton scale. The required high xenon purity is usually achieved by continuous recirculation of xenon gas through a high-temperature getter. This challenges the traditional way of cooling ...
