Medical Emergencies · single question
A patient who recently received a local anesthetic injection feels lightheaded. They have no relevant medical history. What is the FIRST step?
Show answer and explanation
Correct answer: B. Administer oxygen
- A. Aspirin is given for suspected MI with chest pain/ST elevation — not for lightheadedness from LA.
- B. The most likely cause of lightheadedness after LA injection in a healthy patient is a vasovagal response (psychogenic syncope). First step: recline the chair, administer oxygen, and monitor. Oxygen corrects any hypoxia from reduced cardiac output. ✓
- C. Calling 911 immediately would be premature for a simple vasovagal episode. First perform basic supportive measures.
- D. Nitroglycerin is given for angina with chest pain — not for vasovagal lightheadedness from LA injection.
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