How do you administer AIT?
FPs may be asked to administer AIT to their patients. Patients will typically have weekly office visits during the induction phase of AIT and should have appointments every 6 to 12 months during the maintenance phase.6,8
Collaboration with an allergy specialist is wise for dosing schedules and possibly for information regarding adverse reactions during administration. It is essential that AIT be administered by clinicians who are knowledgeable about the signs and symptoms of minor allergic reactions (eg, pruritus, mild erythema, and swelling at the administration site) and severe ones (eg, angioedema, shock, anaphylaxis), as well as who have immediate access to emergency medications and resuscitation, should it be needed.6-8,34
Most (86%) adverse reactions will occur within 30 minutes of administration of AIT; hence, the recommendation is to observe patients for 30 minutes following AIT administration.6,7,34 Continual training and “mock” severe reaction responses are beneficial for staff administering AIT to ensure appropriate equipment is available and that appropriate procedures are followed. Late-phase reactions can occur and usually present within 6 to 12 hours of administration; thus, it is essential for patients to be educated on the signs and symptoms of adverse reactions and on symptomatic and emergent treatment.9,34
Rush immunotherapy regimens for inhalant allergens are associated with increased AEs; therefore, pretreatment with antihistamines, leukotriene antagonists, the monoclonal antibody omalizumab, corticosteroids, or combinations of these agents is often used.6,34 In contrast to inhaled allergens, rush VIT has not been associated with an increased risk of adverse reactions in meta-analyses.6,22,34 Most experts recommend that AIT be discontinued if anaphylaxis occurs.8,34
Is AIT safe?
AIT is a proven safe and effective disease-modifying treatment option.6-8,31,35 Even when AIT is initiated within the season of increased allergen exposure, meta-analyses reveal no increase in adverse events in patients undergoing AIT.35 Given the lack of high-quality evidence confirming the safety of AIT in the following specific situations, both the AAAAI and EAACI have concluded that these conditions/situations are absolute contraindications for AIT due to the risk of severe reactions by activation of underlying disease8,21,36:
- severe asthma;
- acquired immune deficiency syndrome (AIDS); and
- initiation of AIT during pregnancy.
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