What is a potential symptom of local anesthetic toxicity?

Local anesthetic toxicity can lead to a variety of symptoms stemming primarily from its effects on the central nervous system (CNS) and the cardiovascular system. When local anesthetics enter the bloodstream in higher than intended concentrations, they can disrupt normal neuronal function, resulting in various CNS symptoms. These may include seizures, confusion, or even coma. The cardiovascular system can also be adversely affected, leading to issues such as arrhythmias, hypotension, or cardiovascular collapse.

The other options presenting potential symptoms do not directly correlate with the primary manifestations of local anesthetic toxicity. Sleepiness can be a symptom of various conditions but is not a direct result of local anesthetic overdose. High blood pressure is typically not associated with local anesthetic toxicity; in fact, hypotension is more likely due to the vasodilatory effects of some anesthetics. Stomach upset can occur from general anesthesia or procedural anxieties, but it is not a classic symptom of local anesthetic toxicity. Thus, the implications of CNS and cardiovascular symptoms are the most pertinent and significant manifestations that should be monitored during the use of local anesthetics.