AACN ECCO Pulmonary Practice Exam 2026 - Free Pulmonary Exam Practice Questions and Study Guide

The given ABG results indicate a pH of 7.29 and a PaCO2 of 54, which are critical for determining the acid-base status of the patient. A normal pH range is 7.35 to 7.45, and a pH of 7.29 indicates acidosis. The PaCO2 value of 54 mmHg is elevated above the normal range of 35-45 mmHg, suggesting that carbon dioxide is retained in the body.

In cases of respiratory acidosis, the body is unable to effectively exhale carbon dioxide, leading to an accumulation of carbonic acid in the blood, which subsequently lowers the pH. The combination of low pH and high PaCO2 clearly aligns with the parameters for respiratory acidosis. The body's compensatory mechanisms may attempt to correct this, but with the current readings, it indicates an acute respiratory status that is not fully compensated.

Understanding these values allows for the diagnosis of respiratory acidosis, where the primary disturbance originates from respiratory failure or the inability to remove carbon dioxide effectively, demonstrating the impact of ventilation on acid-base balance in the body.