Key Points
Potassium homeostasis:
• K+ is the most essential intracellular cation, generating the resting potential in neuronal and muscle cells.
• Extracellular K+ levels are tightly regulated.
• Any disturbances of serum K+ levels can affect the resting potential and lead to arrhythmias or muscular abnormalities.
Renal K+ handling and changes during maturation:
• The kidneys are primarily responsible for excreting excess K+.
• The goal of adult kidneys is to maintain a zero K+ balance, while newborn kidneys retain K+ to allow somatic growth.
• Premature infants are prone to develop hyperkalemia, because they cannot rapidly eliminate exogenous excess K+.
Disturbances in K+ balance:
• Serum K+ levels can be abnormal due to abnormal intake or abnormal excretion of K+, but can also be caused by abnormal distribution of K+ between the extra- and intracellular space.
• Clinical symptoms vary and do not allow distinguishing between hypo- and hyperkalemia.
Hypokalemia:
• Mild hypokalemia is a common finding in clinical practice.
• Administration of diuretics is the most common acquired cause of hypokalemia.
• Decreased intake of K+ can lead to total body K+ depletion and hypokalemia.
Hyperkalemia:
• Hyperkalemia is rare in individuals with normal renal function.
• ECG findings with hyperkalemia occur individually and cannot be correlated with the serum K+ level per se.
• Medications are a common cause of hyperkalemia in susceptible individuals
This chapter is dedicated to my beloved parents, Florenza and Yoan Goilav-Glück.
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Goilav, B., Trachtman, H. (2010). Disorders of Potassium Balance. In: Feld, L., Kaskel, F. (eds) Fluid and Electrolytes in Pediatrics. Nutrition and Health. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60327-225-4_3
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