Which of the following is a symptom of confusion in a patient?

Dehydration can manifest as a symptom of confusion in patients due to its impact on the body's physiological processes. When a person becomes dehydrated, the balance of electrolytes is disrupted, which can affect brain function. This disruption can lead to cognitive impairment, including confusion, as the brain requires adequate hydration to operate optimally. Electrolyte imbalances may impair neuronal function and lead to altered mental status, including confusion or disorientation.

In this context, while other options may also lead to complications in patient health, they are not directly associated with cognitive symptoms like confusion. Chest pain typically indicates a problem with the heart or lungs, tachycardia is primarily a cardiac symptom, and hypotension can indicate overall circulatory issues, but they do not specifically correlate to the cognitive changes seen in confusion.