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Disorders of Potassium Balance

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Fluid and Electrolytes in Pediatrics

Part of the book series: Nutrition and Health ((NH))

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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