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Summary
Adverse reactions to local anesthetics are usually from excessive drug doses, not true allergies. Allergic reactions, though rare, can be severe, but localized reactions and contact dermatitis are treatable.
Area of Science:
- Anesthesiology
- Dermatology
- Allergology
Background:
- Adverse reactions to local anesthetics are frequently misattributed to allergy.
- True allergic reactions are uncommon compared to other drug classes.
Purpose of the Study:
- To differentiate true allergic reactions from dose-related adverse effects of local anesthetics.
- To review the mechanisms, manifestations, and diagnostic approaches to local anesthetic hypersensitivity.
Main Methods:
- Review of existing literature on local anesthetic adverse reactions.
- Analysis of reaction types: systemic vs. local, cell-mediated vs. antibody-mediated.
- Evaluation of diagnostic testing: patch testing, intradermal testing.
Main Results:
- Most reactions result from high plasma concentrations (toxicity), not allergy.
- Cell-mediated reactions (contact dermatitis) account for over 80% of allergic cases.
- Systemic anaphylaxis is rare but potentially fatal; localized reactions are less severe.
- Patch testing is valuable for contact allergy; intradermal testing is not useful for systemic sensitivity.
Conclusions:
- Distinguishing local anesthetic toxicity from true allergy is crucial for appropriate management.
- Contact dermatitis is the most common allergic manifestation.
- Prompt treatment with epinephrine, antihistamines, and steroids is essential for systemic reactions, while topical steroids manage contact dermatitis.