Which client is most likely to exhibit the ABG pattern pH 7.25, PCO2 60 mm Hg, HCO3 26 mEq/L?

Which client is most likely to exhibit the ABG pattern pH 7.25, PCO2 60 mm Hg, HCO3 26 mEq/L?

• A. A client with pulmonary fibrosis
• B. A client who has been vomiting for 3 days
• C. A client with uncontrolled type 1 diabetes
• D. A client who takes sodium bicarbonate for indigestion

Answer: (A)

This pattern reflects respiratory acidosis. The acidemia (pH 7.25) comes from elevated carbon dioxide (PCO2 60 mm Hg), meaning the primary problem is CO2 retention from inadequate ventilation. The bicarbonate level is normal (26 mEq/L), which suggests there has not yet been metabolic compensation, pointing to an acute rather than chronic process. Pulmonary fibrosis is a restrictive lung disease that impairs ventilation, leading to CO2 build-up and acute respiratory acidosis. The other scenarios fit different patterns: vomiting causes metabolic alkalosis with high bicarbonate and often a high pH; uncontrolled type 1 diabetes causes metabolic acidosis with low bicarbonate; taking sodium bicarbonate causes metabolic alkalosis with elevated bicarbonate.

This pattern reflects respiratory acidosis. The acidemia (pH 7.25) comes from elevated carbon dioxide (PCO2 60 mm Hg), meaning the primary problem is CO2 retention from inadequate ventilation. The bicarbonate level is normal (26 mEq/L), which suggests there has not yet been metabolic compensation, pointing to an acute rather than chronic process.

Pulmonary fibrosis is a restrictive lung disease that impairs ventilation, leading to CO2 build-up and acute respiratory acidosis. The other scenarios fit different patterns: vomiting causes metabolic alkalosis with high bicarbonate and often a high pH; uncontrolled type 1 diabetes causes metabolic acidosis with low bicarbonate; taking sodium bicarbonate causes metabolic alkalosis with elevated bicarbonate.