RCIS Practice Test 2025 – All-in-One Exam Prep

A person with chronic Chronic Obstructive Pulmonary Disease (COPD) often exhibits impaired gas exchange due to the destruction of alveolar walls and alterations in lung mechanics. As a result, they may experience elevated levels of carbon dioxide (CO2) in the bloodstream, which is a condition known as hypercapnia. This increase in CO2 occurs because the damaged lungs have reduced ability to expel this gas during respiration.

In conjunction with the elevated CO2 levels, patients with chronic COPD typically show decreased oxygen saturation levels, which indicates inadequate oxygenation of the blood. This hypoxemia occurs as a result of air trapping, airway obstruction, and compromised lung function. Therefore, the combination of increased CO2 levels along with decreased oxygen saturation is a characteristic finding in individuals suffering from chronic COPD.

The other options do not accurately reflect the typical physiological changes seen in chronic COPD. Normal oxygen saturation levels would suggest efficient gas exchange, which is uncommon in COPD patients. Similarly, increased oxygen saturation levels do not align with the typical presentation, as COPD often results in poor oxygenation. A stable respiratory rate may be observed at times, but it does not capture the underlying issues with gas exchange or the physiological strain caused by the disease.