Which of the following serum electrolyte l

问题单项选择题

Which of the following serum electrolyte levels would the nurse expect to find in an infant with persistent vomiting()

A. K⁺, 3.2 mEq/L; Cl^-, 92 mEq/L; Na⁺, 120 mEq/L.

B. K⁺, 3.4 mEq/L; Cl^-, 120 mEq/L; Na⁺, 140 mEq/L.

C. K⁺, 3.5 mEq/L; Cl^-, 90 mEq/L; Na⁺, 145 mEq/L.

D. K⁺, 5.5 mEq/L; Cl^-, 110 mEq/L; Na⁺, 130 mEq/L.

答案

参考答案：A

解析：

The serum electrolyte values in an infant with persistent vomiting reflect hypokalemia (K⁺ level of 3.2mEq/L), hypochloremia (Cl^- level of 92mEq/L), and hyponatremia (Na⁺ level of 120mEq/L). Chloride and sodium function together to maintain fluid and electrolyte balance. With vomiting, sodium chloride and water are lost in gastric fluid. As dehydration occurs, potassium moves into the extracellular fluid.