Final answer:
The definitive treatment for local anesthetic systemic toxicity is Intralipid, which is administered intravenously and works by binding with the local anesthetic and removing it from the bloodstream.
Step-by-step explanation:
The definitive treatment for a patient with local anesthetic systemic toxicity is Intralipid.
Local anesthetic systemic toxicity (LAST) occurs when large amounts of local anesthetic are absorbed into the bloodstream, leading to systemic effects such as cardiac arrhythmias or central nervous system excitation. Intralipid, a lipid emulsion, is the recommended treatment for LAST due to its ability to bind with the local anesthetic and remove it from the bloodstream.
Intralipid is administered intravenously and works by creating a lipid sink that sequesters the local anesthetic, reducing its concentration in the blood and mitigating its toxic effects. It has been shown to be effective in reversing the cardiac and central nervous system effects of local anesthetic toxicity.