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Potassium regulation in the neonate

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Abstract

Potassium, the major cation in intracelluar fluids, is essential for vital biological functions. Neonates maintain a net positive potassium balance, which is fundamental to ensure somatic growth but places these infants, especially those born prematurely, at risk for life-threatening disturbances in potassium concentration [K+] in the extracellular fluid compartment. Potassium conservation is achieved by maximizing gastrointestinal absorption and minimizing renal losses. A markedly low glomerular filtration rate, plus adaptations in tubular transport along the nephron, result in low potassium excretion in the urine of neonates. Careful evaluation of clinical data using reference values that are normal for the neonate’s postmenstrual age is critical to avoid over-treating infants with laboratory results that represent physiologic values for their developmental stage. The treatment should be aimed at correcting the primary cause when possible. Alterations in the levels or sensitivity to aldosterone are common in neonates. In symptomatic patients, the disturbances in [K+] should be corrected promptly, with close electrocardiographic monitoring. Plasma [K+] should be monitored during the first 72 h of life in all premature infants born before 30 weeks of postmenstrual age as these infants are prone to develop non-oliguric hyperkalemia with potential serious complications.

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  1. Department of Pediatrics, University of Puerto Rico, Medical Sciences Campus, PO Box 365067, San Juan, Puerto Rico, 00936-5067

    Melvin Bonilla-Félix

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1. d

2. c

3. d

4. b

5. e

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Bonilla-Félix, M. Potassium regulation in the neonate. Pediatr Nephrol 32, 2037–2049 (2017). https://doi.org/10.1007/s00467-017-3635-2

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