By Yu. E. Moskalenko
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Extra info for Biophysical Aspects of Cerebral Circulation
O n the basis of the above theoretical concepts, a study of the local cerebral blood flow using the clearance curve of hydrogen, generated locally in brain tissue by electrochemical means, was carried out by us. Figure 15 shows the scheme for generating hydrogen in the brain and recording it polarographically. T w o platinum electrodes (a generating electrode with a diameter of 150 μ and a recording electrode with a diameter of 100 μ) were stereotactically implanted at the same point either on the surface or in deeper layers of the brain of rabbits or cats.
30 l o g j o X and Do is the ordinal value of the slope of the curve on a log j o scale during the first minute of clearance (Fig. 13). Calculations of local cerebral blood flow based on the above equations have made it possible to elaborate various modified methods which mainly differ in the type of indicator used and the method of saturating the brain with it. Two types of indicator are used to record the regional cerebral blood flow. These are nondiffusable and diffusable indicators. With the exception of hydrogen, they are all radioactive isotopes of inert gases or isotopes of biologically inactive chemical elements.
It is also necessary to raise the concentration of Xe^^^ considerably, which leads to a corresponding increase in its recirculation which also lowers the accuracy of the measurements. In recent years it has been shown that hydrogen can be successfully used as an indicator of cerebral blood flow. Like the radioactive inert gases, it passes freely across the blood-brain barrier. The rate of its clearance can be measured by means of implanted platinum electrodes (Aukland et al, 1964; Fieschi et al, 1965).