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- W1993313483 abstract "The significance of extracellular potassium in central respiratory control was investigated using the isolated brainstem–spinal cord preparation of the neonatal rat. Depth profiles of extracellular potassium activity ([K+])ECF in the medulla were measured with ion-sensitive microelectrodes. Although [K+]ECF increased with depth in medullary tissue during control (4 mM) and low (1 mM) potassium concentration ([K+])CSF superfusion, this gradient disappeared with higher [K+]CSF. With low [K+]CSF (1 mM), respiratory CO2 responsiveness was abolished, and increased with high [K+]CSF (8 mM). Respiratory frequency (fR) was diminished at low [K+]CSF (1 mM), and increased with elevated [K+]CSF (8 and 16 mM); with yet higher [K+]CSF (32 mM) apnea occurred after a transient increase in fR. Perforated patch recording revealed that high [K+]ECF decreased membrane resistance, depolarized membrane potential, and increased firing frequency in most of the recorded medullary neurons. High [K+]ECF also increased excitatory and inhibitory post-synaptic potentials of medullary neurons and augmented the functional connectivity among neurons. It is concluded that [K+]ECF is of importance in the maintenance of respiratory rhythm and central chemosensitivity." @default.
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- W1993313483 date "2005-03-01" @default.
- W1993313483 modified "2023-10-11" @default.
- W1993313483 title "Significance of extracellular potassium in central respiratory control studied in the isolated brainstem–spinal cord preparation of the neonatal rat" @default.
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- W1993313483 doi "https://doi.org/10.1016/j.resp.2004.10.009" @default.
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