Final answer:
Lidocaine is used as a local anesthetic for nasal, laryngeal, and esophageal surgeries. It works by blocking voltage-gated sodium channels, providing numbness and pain relief.
Step-by-step explanation:
The local anesthetic used for nasal, laryngeal, and esophageal surgeries is Lidocaine. Lidocaine works by blocking voltage-gated sodium channels, which prevents the initiation and transmission of sensory impulses, resulting in numbness and pain relief. It is commonly used for its fast-acting and long-lasting effects.