Anaphylaxis in Dentistry

What is anaphylaxis?

• A rapid, systemic allergic reaction that can involve the skin, respiratory, cardiovascular, and gastrointestinal systems. It can progress from mild symptoms to life‑threatening airway obstruction and circulatory collapse within minutes.

Pathophysiology

• IgE‑mediated mast‑cell and basophil degranulation releases histamine, leukotrienes, prostaglandins, and cytokines.
• Resulting vasodilation, increased vascular permeability, bronchoconstriction, and myocardial depression produce the classic clinical picture.

Common Dental Triggers

• Local anesthetics (especially amide agents with preservatives)
• Latex in gloves, dams, and impression materials
• Antibiotics (penicillins, clindamycin) and analgesics (NSAIDs)
• Mouth rinses containing chlorhexidine or essential oils
• Sedation agents (midazolam, propofol) and general anesthetic gases

Recognition – Early Signs

System	Typical Findings
Skin	Urticaria, flushing, angio-edema, pruritus
Respiratory	Dyspnea, wheeze, stridor, throat tightness
Cardiovascular	Tachycardia → hypotension, syncope
Gastro-intestinal	Nausea, vomiting, abdominal pain
Neurologic	Dizziness, sense of impending doom

Symptoms usually appear within minutes of exposure, but delayed or biphasic reactions can occur up to several hours later.

Immediate Management (Step‑by‑Step)

1. Call emergency services (activate EMS) and assign a team member to do it.
2. Position the patient – supine with legs elevated unless respiratory distress dictates a semi‑upright posture.
3. Administer intramuscular epinephrine 0.3 mg (1:1000) into the anterolateral thigh; repeat every 5–15 min if no improvement.
4. Secure the airway – high‑flow oxygen, consider jaw thrust, and be prepared for advanced airway if swelling progresses.
5. Adjunctive meds (after epinephrine):
   • Antihistamine (e.g., diphenhydramine 25–50 mg IV/IM) for cutaneous symptoms.
   • Corticosteroid (e.g., methylprednisolone 125 mg IV) to reduce late‑phase reactions.
   • Bronchodilator (e.g., albuterol) for bronchospasm.
6. Monitor vitals continuously; treat hypotension with IV fluids (crystalloid bolus 1–2 L).
7. Document the event, drug administered, dose, time, and patient response. Arrange follow‑up with the patient’s GP/allergist.

Prevention Strategies

• Comprehensive medical history: ask about known drug, latex, and food allergies; previous anaphylaxis episodes.
• Allergy testing when a patient reports a suspected drug reaction.
• Latex‑free protocols for patients with latex sensitivity.
• Use preservative‑free anesthetic solutions and consider alternative agents (e.g., articaine without epinephrine).
• Maintain an emergency kit (epinephrine auto‑injectors, oxygen, airway adjuncts) and ensure all staff are trained annually per Resuscitation Council guidelines.

Post‑Event Care

• Observe the patient for at least 4–6 hours (longer if biphasic risk).
• Provide a written emergency action plan and advise the patient to wear medical alert identification.
• Report the incident to local health authorities if required and update the patient’s dental record.

Clinical Pearls

• Never hesitate – epinephrine delay is the single biggest predictor of fatal outcome.
• Keep epinephrine auto‑injectors in the front drawer; check expiration dates quarterly.
• Use a “two‑person” drill: one administers meds, the other manages airway and calls EMS.
• Ask about recent exposures (e.g., new mouthwash) even if the patient reports no known allergies.
• Biphasic reactions are more common after severe initial episodes; extend monitoring accordingly.

Quick Reference

• Recognize: skin rash + respiratory distress + hypotension = anaphylaxis.
• Call EMS immediately; assign a team member.
• Epinephrine IM 0.3 mg (repeat q5‑15 min if needed).
• Airway: high‑flow O₂, jaw thrust, prepare for intubation.
• Adjuncts: antihistamine, steroids, bronchodilator after epinephrine.
• Observe ≥4 h; document thoroughly; arrange allergy follow‑up.

FAQ