Voltage-dependent K+ currents in hypoxia. Current recordings (holding potential -80 mV, ΔV 10 mV) in control, hypoxia and washout revealing different reactions of K+ currents to hypoxia. A) Most neurones (63%) showed a decreased K+ current during hypoxia which was irreversible in some cells (n = 17). B) Another group of neurones (26%, n = 7) displayed a reversible increase in K+ current. C) Some neurones showed no (11%) or only small differences in K+ currents during hypoxia (n = 3). Current-voltage relations shown right. Bath: sodium-free choline chloride, pipette: potassium fluoride.