Certified Nurses Operating Room (CNOR) Practice Exam

What is an initial symptom of local anesthesia toxicity?

1. Hypotension

2. Bradycardia

3. Hypertension

4. Decreased responsiveness

The correct answer is: Hypertension

The initial symptom of local anesthesia toxicity is often a central nervous system (CNS) manifestation rather than cardiovascular changes, which explains why the correct answer is not hypertension. Early signs of local anesthesia toxicity typically begin with CNS stimulation, which can progress to CNS depression. Symptoms such as confusion, dizziness, and even seizures may occur before significant cardiovascular effects take place. While hypertension may occur later in the progression of toxicity due to compensatory mechanisms, it is not the initial symptom. Understanding that local anesthetics can affect the CNS first is key to recognizing the signs of toxicity. Early detection is crucial as it allows for timely intervention before the condition worsens. Monitoring for initial signs of toxicity, such as neurological changes, is essential to ensure patient safety during procedures involving local anesthesia.