Society for Pediatric Anesthesia
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A 1-month-old infant with projectile vomiting, inability to tolerate feeds, sunken fontanelles, and dry diapers is diagnosed with pyloric stenosis and severe dehydration. Which of the following MOST accurately describes a physiologic change that maintains adequate blood pressure and renal perfusion in the context of this patient’s clinical condition?

A.  Increased parasympathetic tone
B.  Decreased sodium reabsorption at the renal tubule
C.  Decreased secretion of arginine vasopressin by the pituitary gland
D.  Increased secretion of renin by the juxtaglomerular cells

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