Indicate the sympathomimetic agent, which is combined with a local anesthetic to prolong the duration of infiltration nerve block:

Correct Answer: A

Rationale: Step-by-step rationale: 1. Epinephrine is a sympathomimetic agent that constricts blood vessels, reduces bleeding, and prolongs the effect of local anesthetics. 2. By vasoconstriction, epinephrine delays systemic absorption of the anesthetic, leading to a longer duration of action. 3. Xylometazoline is a nasal decongestant, not used for nerve blocks. 4. Isoproterenol and dobutamine are primarily used for cardiac conditions, not for local anesthesia. Summary: Epinephrine is the correct choice due to its vasoconstrictive properties prolonging the effect of local anesthetics. Xylometazoline, Isoproterenol, and Dobutamine are incorrect as they do not serve the same purpose in nerve blocks.

Correct Answer: A

Rationale: The correct answer is A, depression of the medullar respiratory center. Hypnotics can suppress the central nervous system, leading to respiratory depression, which can result in death. This is the most common cause of death in hypnotic overdoses. B: Hypothermia is not a usual cause of death in hypnotic overdoses. C: Cerebral edema is not a direct result of hypnotic overdose and would not typically be the cause of death. D: Status epilepticus is not a typical outcome of hypnotic overdose and would not directly lead to death in this context.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.