At what PO2 does oxygen toxicity become a major concern?

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Complete your ADCI Dive Supervisor Certification. Review with flashcards and multiple-choice questions, each question includes hints and detailed explanations to ensure understanding and success on your test.

Multiple Choice

At what PO2 does oxygen toxicity become a major concern?

Explanation:
Oxygen toxicity depends on the inspired oxygen partial pressure (PO2). When the PO2 gets high enough, the nervous system becomes at risk, and symptoms can appear quickly. The level at which CNS oxygen toxicity becomes a major concern is about 1.6 atmospheres absolute. At or above this PO2, even short exposures can trigger effects like visual changes, dizziness, twitching, or seizures, especially with longer durations. That’s why gas planning for dives and oxygen-rich mixes aims to keep the PO2 around or below this threshold. Values well below it are generally safe, while levels well above it pose severe risk and cardiopulmonary or CNS toxicity can occur rapidly.

Oxygen toxicity depends on the inspired oxygen partial pressure (PO2). When the PO2 gets high enough, the nervous system becomes at risk, and symptoms can appear quickly. The level at which CNS oxygen toxicity becomes a major concern is about 1.6 atmospheres absolute. At or above this PO2, even short exposures can trigger effects like visual changes, dizziness, twitching, or seizures, especially with longer durations. That’s why gas planning for dives and oxygen-rich mixes aims to keep the PO2 around or below this threshold. Values well below it are generally safe, while levels well above it pose severe risk and cardiopulmonary or CNS toxicity can occur rapidly.

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