A 5-week-old infant boy is brought to the emergency department because of worsening nonbilious projectile vomiting over the past week. He was born full-term without any complications and has been gaining weight normally.
His temperature is 98.6°F (37°C), pulse is 135 beats/min, respirations are 39 breaths/min, and blood pressure is 75/45 mm Hg. On palpation, there is a small mass in the epigastrium.
Which of the following laboratory findings is most likely to be seen in this infant?
A. Hyperglycemic metabolic acidosis
B. Hypernatremic, hyperchloremic metabolic acidosis
C. Hypochloremic, hypokalemic metabolic alkalosis
D. Hyponatremic, hyperkalemic metabolic acidosis
E. Hyponatremic, hypochloremic metabolic alkalosis
The answer will be disclosed shortly!
The present case appears in Medscape.