Zusammenfassung
Das Gesamtkörpernatrium eines 70 kg schweren Menschen liegt bei 4200 mmol. Davon befi nden sich 40 % im Knochen, 10 % intra- und transzellulär und 50 % im Extrazellularraum. Die intrazelluläre Natriumkonzentration wird mit 5−20 mmol/l je nach Gewebe und Nachweismethode angegeben. Die Natriumkonzentration im Extrazellularraum liegt bei rund 145 mmol/l und wird durch osmotische Mechanismen relativ eng konstant gehalten. Natrium ist als wichtigstes Kation im extrazellulären Raum zusammen mit den Anionen Chlorid (105 mmol/l) und Bicarbonat (26 mmol/l) für die Osmolarität verantwortlich. Der Konzentrationsgradient zwischen intra- und extrazellulärem Natrium wird durch das Natrium-Kalium-ATPase-Enzymsystem als biochemisches Korrelat des transmembranen Transports aufrechterhalten [7].
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Forster, N. (2012). Elektrolyt- und Säure-Basen-Haushalt. In: Schwab, S., Schellinger, P., Werner, C., Unterberg, A., Hacke, W. (eds) NeuroIntensiv. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16911-3_12
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