Abstract:
:Artificial CSF containing 12mEq/1 of potassium (4 times normal concentration) was perfused over the surface of normal neocortex in 10 locally or barbiturate anesthetized cats. Extracellular potassium concentrations ([K+]OS) were measured as a function of time to 8 h and of depth to 3 mm. Analysis of the [K+]O versus depth and [K+]O versus time profiles showed that the distribution of extracellular potassium could be modelled by a process of diffusion with diffusion coefficient = 1.03 +/- 0.16 sq.mm/h, and a surface barrier to diffusion with magnitude given by a barrier constant 0.8 +/- 0.2 mm-1, and with a small correction for active uptake into cells and blood vessels. The profiles obtained differ considerably from those which could be predicted from kinetic properties of potassium in aqueous solution.
journal_name
Brain Resjournal_title
Brain researchauthors
Fisher RS,Pedley TA,Prince DAdoi
10.1016/0006-8993(76)90265-1subject
Has Abstractpub_date
1976-01-16 00:00:00pages
223-37issue
2eissn
0006-8993issn
1872-6240pii
0006-8993(76)90265-1journal_volume
101pub_type
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