Certified Hyperbaric Technologist Practice Test

What factor can increase the likelihood of an oxygen toxicity seizure?

1. High ambient pressure

2. Dehydration

3. Levothyroxine (Synthroid)

4. Increased oxygen concentration

The correct answer is: Increased oxygen concentration

Increased oxygen concentration can significantly heighten the likelihood of an oxygen toxicity seizure. When the partial pressure of oxygen rises above normal physiological levels, it can lead to a range of toxic effects on the central nervous system, particularly when the oxygen is administered at higher pressures, such as in hyperbaric oxygen therapy or during deep dives. Oxygen toxicity primarily affects the brain, where elevated levels can disrupt neuronal function and trigger seizures. This is particularly critical for hyperbaric applications, as oxygen is delivered at various pressures. The higher the concentration of oxygen and the exposure duration, the greater the risk of seizures and other toxic effects. While high ambient pressure and dehydration can influence overall health and safety, they are not direct causes of oxygen toxicity seizures. Similarly, medications like levothyroxine do not play a direct role in increasing seizure risk related to oxygen exposure. Understanding the balance between oxygen concentration and pressure is essential for hyperbaric technologists to minimize risks and ensure patient safety during treatments.