What is the primary reason for monitoring time spent on 100% O2 in patients?

The primary reason for monitoring time spent on 100% oxygen in patients is to avoid oxygen toxicity. When patients are exposed to high concentrations of oxygen for extended periods, it can lead to cellular damage and complications, particularly in the lungs and central nervous system. Oxygen toxicity arises because high levels of oxygen can generate reactive oxygen species, leading to oxidative stress and subsequent injury to tissues. This is especially significant in patients with underlying respiratory conditions or in situations where 100% oxygen is used for therapeutic reasons, such as in hyperbaric oxygen therapy.

Monitoring the duration of exposure to 100% oxygen helps healthcare providers ensure that patients receive the necessary level of oxygen without exceeding safe limits. By controlling the time spent on such high concentrations, clinicians can mitigate the risk of toxic effects while still providing effective treatment. Other concerns, such as discomfort or anxiety, are important but secondary to the critical safety issue posed by oxygen toxicity.