Anaphylaxis Management Guidelines

Immediate Interventions

The American Academy of Allergy, Asthma, and Immunology recommends administering intramuscular epinephrine immediately at the first sign of anaphylaxis, as it is the single most critical intervention that saves lives, with no absolute contraindication to its use in this setting 1, 2, 3
Epinephrine administration should never be delayed while considering other diagnoses or waiting for symptoms to worsen, as recommended by the American Academy of Allergy, Asthma, and Immunology 1, 4
Positioning the patient supine with legs elevated can help counteract hypotension, as up to 50% of intravascular fluid can shift to extravascular space within 10 minutes, according to the American Heart Association 5, 4
Administering epinephrine intramuscularly into the lateral thigh immediately is recommended, with dosages of 0.3-0.5 mg for adults, 0.3 mg for children ≥25 kg, and 0.15 mg for children 10-25 kg, as suggested by the American Academy of Pediatrics and the American Heart Association 1, 3, 6
Calling for emergency medical services immediately and noting the time is crucial, as recommended by the American Heart Association 2, 3, 4
Removing the triggering agent, if identifiable, is essential, as recommended by the American Academy of Allergy, Asthma, and Immunology 2, 4
Establishing an airway and administering 100% oxygen, with intubation if necessary for airway compromise, is critical, as recommended by the American Society of Anesthesiologists 1, 2, 4

Administering normal saline or lactated Ringer's solution rapidly via large-bore IV can help with fluid resuscitation, as recommended by the American Heart Association 2, 4
Repeating epinephrine every 5-10 minutes if there is an inadequate response to the initial dose is recommended, as suggested by the American Academy of Allergy, Asthma, and Immunology 1, 3
Considering continuous IV epinephrine infusion if multiple doses are required is essential, as recommended by the American Society of Anesthesiologists 2, 4
Between 7-18% of patients require more than one dose of epinephrine, according to the American Heart Association 3

H1 antihistamine, such as chlorphenamine 10 mg IV, can be used for urticaria and itching relief only, as recommended by the American Academy of Allergy, Asthma, and Immunology 2, 4
Corticosteroids, such as hydrocortisone 200 mg IV, can be used, but their onset of action is 4-6 hours, so they have no immediate effect on acute anaphylaxis, as noted by the American Academy of Allergy, Asthma, and Immunology 2, 4
Beta-2 agonists, such as salbutamol infusion or inhaled, can be used for persistent bronchospasm, as recommended by the American Thoracic Society 2, 4

Observing patients for a minimum of 4-6 hours after symptom resolution is recommended, as suggested by the American Academy of Allergy, Asthma, and Immunology 7
Extending observation or admitting patients with severe reactions, cardiovascular comorbidity, those requiring multiple epinephrine doses, or those with poor self-management capability is essential, as recommended by the American Heart Association 7
Biphasic reactions can occur in up to 20% of cases, particularly in severe initial presentations, wide pulse pressure, unknown triggers, or drug triggers in children, according to the American Academy of Allergy, Asthma, and Immunology 5, 7

Obtaining serum tryptase levels can help with diagnosis, with initial samples taken as soon as feasible after resuscitation starts, and subsequent samples taken at 1-2 hours and 24 hours after symptom onset, as recommended by the American Academy of Allergy, Asthma, and Immunology 2, 6

Prescribing two epinephrine autoinjectors with proper dosing and training on technique is crucial, as recommended by the American Academy of Allergy, Asthma, and Immunology 7, 6
Providing a written anaphylaxis emergency action plan detailing symptom recognition and step-by-step treatment is essential, as recommended by the American Academy of Pediatrics and the American Heart Association 7, 6
Mandatory referral to an allergist-immunologist for comprehensive trigger identification and long-term management is recommended, as suggested by the American Academy of Allergy, Asthma, and Immunology 7, 6