Advanced Cardiovascular Life Support (ACLS) Practice Exam

What is the danger of routinely administering high concentrations of oxygen during the post-cardiac arrest period?

1. Potential oxygen toxicity

2. Hypoxemia

3. Methemoglobinemia

4. Increased blood pressure

The correct answer is: Potential oxygen toxicity

Routinely administering high concentrations of oxygen during the post-cardiac arrest period can lead to potential oxygen toxicity, which is a significant concern in critical care settings. When high levels of oxygen are administered, especially beyond what the body needs, it can result in the generation of reactive oxygen species (ROS). These ROS can cause cellular damage and inflammation, leading to complications in various organs, particularly the lungs. In the context of a patient who has just undergone cardiac arrest, the goal is to optimize oxygen delivery without causing further harm. While supplemental oxygen is essential to ensure adequate tissue oxygenation post-resuscitation, it is crucial to strike a balance. High concentrations can also lead to complications such as respiratory issues or impaired neurologic outcomes due to oxidative stress. Other options reflect concerns that may arise in different contexts; for instance, hypoxemia is a risk associated with inadequate oxygen administration, methemoglobinemia can result from certain drugs or conditions but not typically from high supplemental oxygen, and increased blood pressure may be affected by various factors during resuscitation but does not directly correlate with oxygen concentration.