An infant with prolonged vomiting secondary to pyloric stenosis has arterial blood gases (ABG) drawn. Which ABG results should a nurse expect when reviewing the laboratory report if the infant has an acid-base imbalance?

Elevated pH, decreased HCO3, and increased PaCO2 indicating respiratory alkalosis with metabolic compensation.

Decreased pH, increased HCO3, and decreased PaCO2 indicating respiratory acidosis with metabolic compensation.

Elevated pH, increased HCO3, and decreased PaCO2 indicating metabolic alkalosis with respiratory compensation.

Decreased pH, decreased HCO3, and increased PaCO2 indicating metabolic acidosis with respiratory compensation.