NPLEX II Minor Surgery Practice Test

Recognizing a neurally mediated vasovagal reaction during local anesthesia involves identifying prodromal signs that reflect a sudden autonomic shift to vasodilation and bradycardia. Flushing and sweating, along with weakness and nausea, fit this pattern and signal impending fainting rather than tissue injury or an allergic reaction. The management—placing the patient in Trendelenburg to improve venous return, providing high-flow oxygen, and giving IV fluids—targets the drop in blood pressure and perfusion that can accompany a vasovagal syncope.

Other symptom clusters point to different problems. A metallic taste and tinnitus are classic early signs of local anesthetic systemic toxicity, which involves CNS and cardiovascular effects from high plasma levels of the anesthetic. Ischemia and necrosis would involve tissue damage and pain before any fainting. Hives and wheezing indicate an allergic reaction or anaphylaxis, which requires airway support and epinephrine.