Measuring blood-flow in dialysis.
نویسندگان
چکیده
منابع مشابه
11 Measuring Cerebral Blood Flow and Metabolism
The first well-recognized CBF studies on humans were performed by Kety and Schmidt in the 1940s using nitrous oxide (N2O) gas. The measurement of CBF was based on the principle that the rate of uptake and clearance of an inert diffusible gas is proportional to blood flow. The tissue concentration of the tracer at equilibrium must therefore be dependent on blood flow rather than diffusibility. T...
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We have measured total renal blood flow (TRBF) as the difference between signals from ultrasound flow probes implanted around the aorta above and below the renal arteries. The repeatability of the method was investigated by repeated, continuous infusions of angiotensin II and endothelin-1 seven times over 8 wk in the same dog. Angiotensin II decreased TRBF (350 +/- 16 to 299 +/- 15 ml/min), an ...
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脳 血管 障害 に おいて脳 循環 代謝 の検 索 は病 態把握 さ らには 治療 の上 に も有 用で あ り,日 常 診療 で もひろ く 用 い られて い る.臨 床的 に はradioisotopeを 利用 した 方 法 が 用 い られ,最 近 で はSPECT(singlephoton emissionCT)やPET(positronemissiontomography)に よ り脳血 流量,脳 酸 素消 費量 な どが測 定 されて い る. 実験 的 な脳 虚 血 やhyperglycemiaな ど種 々の モ デ ルに おい て も局所 の脳 血流 量や 脳代謝 量 の絶対値 を求 め る ことは病態 生理解 明 の上で 意義 のあ る不可 欠な検 索 手段 で あ り,種 々の実 験 デ ー タと ともに利 用 され る. 動 物実 験 にお ける脳血 流量 の...
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Sir, In a recent technical note, Zanen et al. reported poor agreement between different Doppler flow measurements in dialysis shunts, such as conventional Doppler (CD), quantitative colour velocity index (CVI-Q) and ultrasound dilution (DU) w1x. In particular, results of CD measurements did not correlate with those obtained with CVI-Q and DU, respectively. We share the experience of the investi...
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Magnetic resonance imaging techniques measuring CBF have developed rapidly in the last decade, resulting in a wide range of available methods. The most successful approaches are based either on dynamic tracking of a bolus of a paramagnetic contrast agent (dynamic susceptibility contrast) or on arterial spin labeling. This review discusses their principles, possible pitfalls, and potential for a...
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ژورنال
عنوان ژورنال: BMJ
سال: 1968
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.2.5598.176-c