Kinetics of potassium movement in norman cortex.

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 Res

journal_title

Brain research

authors

Fisher RS,Pedley TA,Prince DA

doi

10.1016/0006-8993(76)90265-1

subject

Has Abstract

pub_date

1976-01-16 00:00:00

pages

223-37

issue

2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(76)90265-1

journal_volume

101

pub_type

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