Indications for adding epinephrine to local anesthetics include all the following EXCEPT:

• A. Decrease oozing
• B. Prolong the duration of anesthetic effect
• C. Reduced risk in patients with severe cardiovascular disease
• D. Decrease risk of toxic reaction by reducing circulating levels of the local

Answer: (C)

Epinephrine added to local anesthetics works mainly through vasoconstriction. By constricting small blood vessels, it keeps the anesthetic localized where it’s injected, slows its absorption into the bloodstream, and reduces bleeding in the area. This combination leads to three practical benefits: less oozing during the procedure, a longer duration of numbness because the drug remains near the nerve longer, and a lower peak level of the anesthetic in the bloodstream, which decreases the risk of systemic toxicity.

The statement about reducing risk in patients with severe cardiovascular disease is not an indication. In fact, epinephrine can increase heart rate and blood pressure and may provoke ischemia or arrhythmias in those patients, so it’s used with caution or avoided in such individuals. In those cases, a vasoconstrictor-free alternative or careful medical consultation is preferred.