TYK306
Which statement regarding thyroid hormone is FALSE?
a) Maternal thyroid hormone does not cross the placenta.
b) Neonatal T3/T4 serum levels are proportional to gestational age and birth weight.
c) The sodium-iodide symporter is inhibited by high levels of iodide (I-), also known as the Wolf-Chaikoff effect.
d) Thyroid hormone is essential during the perinatal period for maturation of the CNS.
e) Cardiovascular effects of thyroid hormone include decreased systemic vascular resistance.
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Answer
Answer a. Maternal thyroid hormone does cross the placenta and is essential for fetal central nervous system development. The remainder of the answer options are correct.
Notes
- This question originally printed in the Pediatric Anesthesiology Review Topics kindle book series, and appears courtesy of Naerthwyn Press, LLC.