What could be a vital sign change in an individual who has just ingested a large amount of a stimulant?

Tachycardia is a common vital sign change observed in individuals who have ingested a large amount of a stimulant. Stimulants, such as amphetamines or cocaine, increase the activity of the nervous system, leading to increased heart rate. This surge in sympathetic nervous system activity often causes the heart to beat faster in order to support the heightened state of arousal and energy that stimulants produce.

In contrast, hypotension and bradycardia are generally not associated with stimulant use. Instead, these conditions may be more likely seen in situations involving depressants, which lower the heart rate and blood pressure. Bradypnea, or slow breathing, is also inconsistent with stimulant ingestion as stimulants typically lead to increased respiratory rates, not decreases. Therefore, tachycardia is the expected vital sign change, reflecting the stimulating effects on the cardiovascular system.