Final answer:
For the treatment of local anesthetic systemic toxicity (LAST) crisis, the administration of a 20% lipid emulsion is the correct intervention, as it helps to reduce the toxic effects of local anesthetics in the bloodstream.
Step-by-step explanation:
The medication that should be administered for the treatment of local anesthetic systemic toxicity (LAST) crisis is c) 20% lipid emulsion. This is the preferred treatment as per the guidelines of medical authorities.
Local anesthetics, such as lidocaine and novocaine, work by blocking voltage-gated sodium channels, preventing sodium ions from entering neurons, which is necessary for the initiation of nerve impulses. This blockade effectively causes numbness and prevents pain signal transmission, providing the desired local anesthetic effect. However, if a local anesthetic is inadvertently introduced into the systemic circulation in large quantities, it can lead to LAST, a dangerous condition that requires immediate treatment.
In such a scenario, treatment with a lipid emulsion can be effective. This treatment involves intravenous administration of a 20% lipid emulsion which acts as a 'lipid sink', absorbing and sequestering the local anesthetic molecules, reducing their concentration in cardiac and brain tissue, thereby mitigating the toxic effects. This approach is in line with the latest resuscitation protocols and has been shown to be effective in reversing the severe cardiac and neurological symptoms associated with LAST.