Which sign may occur as a progression with increasing local anesthetic blood levels?

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Multiple Choice

Which sign may occur as a progression with increasing local anesthetic blood levels?

Explanation:
Local anesthetic systemic toxicity (LAST) shows a progression as blood levels rise. Initially, patients often notice sensory and mild CNS signs such as perioral numbness (around the lips), tinnitus, and light-headedness. These reflect rising but still early CNS involvement. As the concentration continues to climb, the CNS can become irritable and then experience more serious effects, culminating in seizures. Seizures represent a later, more severe manifestation of CNS toxicity before potential cardiovascular complications occur. Therefore, seizures are the sign that may appear as toxicity progresses with increasing local anesthetic blood levels, whereas lip numbness, tinnitus, and light-headedness tend to appear earlier.

Local anesthetic systemic toxicity (LAST) shows a progression as blood levels rise. Initially, patients often notice sensory and mild CNS signs such as perioral numbness (around the lips), tinnitus, and light-headedness. These reflect rising but still early CNS involvement. As the concentration continues to climb, the CNS can become irritable and then experience more serious effects, culminating in seizures. Seizures represent a later, more severe manifestation of CNS toxicity before potential cardiovascular complications occur. Therefore, seizures are the sign that may appear as toxicity progresses with increasing local anesthetic blood levels, whereas lip numbness, tinnitus, and light-headedness tend to appear earlier.

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