Questions: Which is prevented when a low concentration of oxygen is given to a client with chronic obstructive pulmonary disease (COPD) rather than a high concentration of oxygen? Decrease in red cell formation Rupture of emphysematous bullae Depression of the respiratory center Excessive drying of the respiratory mucosa

The answer is the third one: Depression of the respiratory center.

Explanation for each option:

1. Decrease in red cell formation: This is not directly related to the concentration of oxygen given to a COPD patient. Red cell formation is more influenced by factors like erythropoietin levels and overall oxygenation status over time, not the immediate concentration of oxygen administered.

2. Rupture of emphysematous bullae: While high concentrations of oxygen can potentially lead to complications in COPD patients, the rupture of emphysematous bullae is more related to changes in pressure rather than oxygen concentration.

3. Depression of the respiratory center: This is the correct answer. In patients with COPD, the respiratory drive can be more dependent on hypoxia (low oxygen levels) rather than hypercapnia (high carbon dioxide levels). Administering high concentrations of oxygen can reduce the hypoxic drive, leading to depression of the respiratory center and potentially causing respiratory failure.

4. Excessive drying of the respiratory mucosa: This is more related to the humidity of the oxygen being delivered rather than its concentration. Oxygen therapy can dry out mucosa if not humidified, but this is not the primary concern when choosing oxygen concentration for COPD patients.

In summary, administering a low concentration of oxygen to a COPD patient helps prevent the depression of the respiratory center, which can occur if high concentrations of oxygen are given.