Diffusion Processes Invalidating the Intra-arterial Krypton-85 Beta-Particle Clearance Method for Measurement of Skin Blood Flow in Man
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چکیده
منابع مشابه
Diffusion processes invalidating the intra-arterial krypton-85 beta-particle clearance method for measurement of skin blood flow in man.
Krypton-85 dissolved in 0.9% NaCl was injected into the femoral artery of man; fi particles were measured over the skin of the eras. Cutaneous mean blood flow was calculated using the integral equation of Zierler based on the mean transit time analysis of clearance curves recorded from the cutaneous tissue; these calculations gave estimates which were only about one-fifth those obtained by othe...
متن کاملExternal measurement of regional cerebral blood flow in man by common carotid arterial injection of radioactive krypton-85 saline solution.
1) External recording of cerebral clearance was performed after Kr85 saline solution injection into the common carotid artery. Clearance curve thus obtained was divided into 3 exponentials. The 3rd phase represents mainly clearance of the area perfused with external carotid artery and the rest of the curve after subtraction of the 3rd phase can be treated in the similar way to that of reported ...
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The measurement of cerebral blood flow by means of the nitrous oxide method of Kety and Schmidt (1) or the krypton-85 (Kr85) technique of Lassen and Munck (2) requires a steady state of at least ten minutes, for it is not until the end of such a period that the uptake of the gas by the brain can be estimated indirectly from its concentration in cerebral venous blood. These methods are, therefor...
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We have developed a new method for taking continuous measurements of rCBF by means of continuous infusion of 81mKr. Using this method, it is possible to follow the sequential changes in blood flow of various brain regions continuously. The method makes it possible to observe the sequential changes in CBF following drug administration, motor activation and various kinds of stimulation, and, furt...
متن کاملIntrarenal Distribution of Nutrient Blood Flow Determined with Krypton 85 in the Unanesthetized Dog.
• The development of the couutercnrrent hypothesis as an explanation for the osmotic gradient from cortex to papilla of the kidney has again stimulated investigation of the intrarenal distribution of blood flow. Theoretical considerations have emphasized the necessity of a relatively low medullary blood flow for the maintenance of this gradient. However, present methods of measuring renal blood...
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ژورنال
عنوان ژورنال: Circulation Research
سال: 1967
ISSN: 0009-7330,1524-4571
DOI: 10.1161/01.res.21.3.281