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Flow Assessment (flow + assessment)

Distribution by Scientific Domains
Medical Sciences50%

Selected Abstracts

Transcranial Doppler Blood Flow Assessment in Patients With Mild Heart Failure: Correlates With Neuroimaging and Cognitive Performance

CONGESTIVE HEART FAILURE, Issue 2 2008
Raymond L. C. Vogels MD
Cardiac output and cerebral perfusion are reduced in patients with advanced stages of heart failure. Our aim was to determine whether cerebral blood flow velocity measured by transcranial Doppler ultrasonography was reduced in outpatients with mild heart failure in comparison to controls and, if so, whether this reduction was related to cognitive performance and abnormalities of the brain diagnosed by magnetic resonance imaging. [source]

Recognition of Indigenous Interests in Australian Water Resource Management, with Particular Reference to Environmental Flow Assessment

GEOGRAPHY COMPASS (ELECTRONIC), Issue 3 2008
Sue Jackson
Australia's new national water policy represents a substantial change from the previous approach, because it recognises a potential need for allocations to meet particular indigenous requirements, which will have to be quantitatively defined in water allocation plans. However, indigenous values associated with rivers and water are presently poorly understood by decision-makers, and some are difficult to quantify or otherwise articulate in allocation decisions. This article describes the range of Australian indigenous values associated with water, and the way they have been defined in contemporary water resource policy and discourse. It argues that the heavy reliance of indigenous values on healthy river systems indicates that, theoretically at least, they are logically suited for consideration in environmental flow assessments. However, where indigenous interests have been considered for assessment planning purposes indigenous values have tended to be overlooked in a scientific process that leaves little room for different world views relating to nature, intangible environmental qualities and human relationships with river systems that are not readily amenable to quantification. There is often an implicit but untested assumption that indigenous interests will be protected through the provision of environmental flows to meet aquatic ecosystem requirements, but the South African and New Zealand approaches to environmental flow assessment, for example, demonstrate different riverine uses potentially can be accommodated. Debate with indigenous land-holders and experimentation will show how suited different environment flow assessment techniques are to addressing indigenous environmental philosophies and values. [source]

Assessment of regional differences in myocardial blood flow using T2 -weighted 3D BOLD imaging

MAGNETIC RESONANCE IN MEDICINE, Issue 3 2001
Kara B. Wright
Abstract The feasibility of detecting regional differences in myocardial blood flow based on the blood oxygen level-dependent (BOLD) effect was evaluated in vivo in dogs (N = 9) using a 3D T2 -prepared segmented gradient-echo sequence at 1.5 T. Regional differences in myocardial blood flow were created by administering adenosine through a catheter placed in the left circumflex coronary artery (LCX). The difference in the R2 (1/T2) relaxation rate between the left ventricular myocardial region supplied by the LCX and regions supplied by the left anterior descending coronary artery (LAD) or septal artery during adenosine administration was correlated to the corresponding regional myocardial blood flow difference determined using fluorescent microspheres. A correlation coefficient of 0.80 was found between the MR BOLD measurements and the myocardial flow assessment. Our results show that the sequence used in this study allows fast 3D BOLD imaging of the heart, and is a promising technique for detecting regional myocardial perfusion differences. Magn Reson Med 46:573,578, 2001. © 2001 Wiley-Liss, Inc. [source]

Review Article: Ocular blood flow assessment using continuous laser Doppler flowmetry

ACTA OPHTHALMOLOGICA, Issue 6 2010
Charles E. Riva
Acta Ophthalmol. 2010: 88: 622,629 Abstract. This article describes the technique of continuous laser Doppler flowmetry (LDF) as applied to the measurement of the flux of red blood cells in the optic nerve head, iris and subfoveal choroid. Starting with the exposition of the physical principles underlying LDF, we first describe the various devices developed to perform LDF in these vascular beds. We then discuss the clinical protocols, blood flow parameters, calibration procedures, reproducibility and limitations of the LDF technique. Various problems still need to be solved in order to bring to light the full potential of LDF in the assessment of microcirculatory haemodynamics. [source]

Recognition of Indigenous Interests in Australian Water Resource Management, with Particular Reference to Environmental Flow Assessment

GEOGRAPHY COMPASS (ELECTRONIC), Issue 3 2008
Sue Jackson
Australia's new national water policy represents a substantial change from the previous approach, because it recognises a potential need for allocations to meet particular indigenous requirements, which will have to be quantitatively defined in water allocation plans. However, indigenous values associated with rivers and water are presently poorly understood by decision-makers, and some are difficult to quantify or otherwise articulate in allocation decisions. This article describes the range of Australian indigenous values associated with water, and the way they have been defined in contemporary water resource policy and discourse. It argues that the heavy reliance of indigenous values on healthy river systems indicates that, theoretically at least, they are logically suited for consideration in environmental flow assessments. However, where indigenous interests have been considered for assessment planning purposes indigenous values have tended to be overlooked in a scientific process that leaves little room for different world views relating to nature, intangible environmental qualities and human relationships with river systems that are not readily amenable to quantification. There is often an implicit but untested assumption that indigenous interests will be protected through the provision of environmental flows to meet aquatic ecosystem requirements, but the South African and New Zealand approaches to environmental flow assessment, for example, demonstrate different riverine uses potentially can be accommodated. Debate with indigenous land-holders and experimentation will show how suited different environment flow assessment techniques are to addressing indigenous environmental philosophies and values. [source]