TYK285

Which of the following statements about the Fractional Excretion of Sodium (FENa) is correct?

a) FENa is greater than 1% in the neonate because of immature renal function leading to salt wasting

b) FENa is greater than 1% in utero in order to maintain amniotic fluid volume

c) FENa greater than 1% is necessary order to avoid hypernatremia under normal conditions

d) A single FENa value is sufficient to differentiate between prerenal and intrarenal causes of renal failure

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Answer

Answer b. FENa is increased in utero in order to maintain amniotic fluid volume, and premature infants may thus have an increased FENa and may be at risk for sodium wasting. The healthy term neonate has a FENa less than 1% to meet anabolic growth requirements.

Notes

This question originally printed in the Pediatric Anesthesiology Review Topics kindle book series, and appears courtesy of Naerthwyn Press, LLC.

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