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...
متن کاملAortic blood flow subtraction: an alternative method for measuring total renal blood flow in conscious dogs.
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 ...
متن کاملMeasuring cerebral blood flow using magnetic resonance imaging techniques.
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...
متن کاملA method for measuring cerebral hemispheric blood flow and metabolism.
A Method for Measuring Cerebral Hemispheric Blood Flow and Metabolism • A new method for measuring cerebral hemispheric blood flow together with metabolism using an injection of a 5 ml bolus of hydrogen-saturated saline into each internal carotid artery is described. This method was extensively evaluated in the monkey prior to being used in man. Under fluoroscopic control, a catheter was insert...
متن کامل[Autoradiographic method for measuring regional cerebral blood flow in rat].
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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ژورنال
عنوان ژورنال: JAMA Ophthalmology
سال: 2015
ISSN: 2168-6165
DOI: 10.1001/jamaophthalmol.2015.2287