What is a common sign that a patient is receiving too much oxygen?

Oxygen toxicity symptoms are indicative of a situation where a patient is receiving an excessive amount of oxygen. This condition can occur when high concentrations of oxygen are administered, typically at pressures greater than normal atmospheric pressure, or when the duration of exposure to high oxygen levels is prolonged. Symptoms of oxygen toxicity can include visual changes, dizziness, nausea, muscle twitching, and respiratory distress. This is particularly important in settings such as hyperbaric oxygen therapy or in patients with chronic lung conditions who might be more susceptible to the adverse effects of high oxygen levels.

The other choices present common responses or symptoms that might not explicitly indicate oxygen toxicity. For instance, an increased heart rate can result from various physiological responses and conditions, and dizziness and lightheadedness may also be caused by factors unrelated to oxygen levels. Decreased respiratory effort might suggest respiratory distress or failure rather than simply an overdose of oxygen. Thus, oxygen toxicity is the clearest indicator of a patient receiving too much oxygen.