Final answer:
To decrease bleeding during nasotracheal intubation, epinephrine is the best option as it causes vasoconstriction, thus reducing blood flow and bleeding. Lidocaine serves as a local anesthetic and dexamethasone as an anti-inflammatory, neither of which directly reduces bleeding during the procedure.
Step-by-step explanation:
To decrease bleeding during nasotracheal intubation, epinephrine is commonly used. Epinephrine can cause vasoconstriction of blood vessels, which helps to reduce blood flow and bleeding. Option 1, lidocaine, is normally used as a local anesthetic to numb the area, which may help with pain but not specifically with bleeding. Option 3, saline, is often used for cleaning or hydrating tissues but does not decrease bleeding. Option 4, dexamethasone, is a corticosteroid that reduces inflammation but is not typically used to reduce acute bleeding during a procedure like intubation.