Anaphylaxis in the pediatric patient: optimizing management and prevention

Extrinsic and Intrinsic Modulators of Anaphylaxis

The severity of anaphylaxis is determined by many factors. The allergenic source as well as the age of the affected individual and the route of allergen exposure encompass the major contributors of the clinical outcome. Moreover, the severity can be modulated further by intrinsic and extrinsic factors. Among these, the genetic predisposition, certain comorbidities such as uncontrolled asthma, and hormonal fluctuations have been proposed as intrinsic and antihypertensive medications or physical activity as extrinsic factors. Recent advances have highlighted immunologic pathways that may exacerbate the response to allergens through receptors on mast cells, basophils, platelets, and other granulocytes. Atopy, platelet-activating factor acetylhydrolase deficiency, hereditary alpha tryptasemia, and clonal mast cell disorders are examples associated with genetic alterations that may predispose to severe anaphylaxis. Identifying risk factors that lower the threshold of reactivity or increase the severity of multisystem reactions is important in the management of this patient population.

Anaphylaxis management: a survey of school and day care nurses in Lebanon

OBJECTIVE

Children are at a high risk of developing allergic reactions. Since they spend lots of time at the school or day care, the odds of having an allergic event in this setting is high, hence placing the onus of properly managing their event on nurses. In Lebanon, little is known whether a standardised policy for managing allergic and anaphylactic reaction exists, leaving children unsafe and the school personnel liable. Thus, the aim of this study is to describe the current practices in the management of severe allergies and anaphylaxis by Lebanese nurses working in schools and day cares and to explore the perceived need for a protocol to manage anaphylaxis reaction.

METHODS

A cross-sectional survey with nurses working at schools and day cares in Lebanon was conducted.

RESULTS

A total of 59 school and day care nurses participated. Eighteen of the school and day care nurses reported having a written policy describing the management steps. Only 12 had witnessed an anaphylactic event. Of those, 10 reported administering an antihistamine medication orally instead of epinephrine intramuscular. Most respondents (56) believed that a standardised guideline for the management of anaphylaxis was essential, and 9 indicated being hesitant to give the epinephrine intramuscular even in the presence of a policy. Finally, 55 stated the need for training nurses in identifying and managing anaphylaxis as a must.

CONCLUSION

Currently, the management of anaphylaxis reaction in schools and day cares is suboptimal. Hence, there is a need for a standardised nursing guideline and training for nurses in these settings.

Comparison of drug delivery with autoinjector versus manual prefilled syringe and between three different autoinjector devices administered in pig thigh

Parenteral routes of drug administration are often selected to optimize actual dose of drug delivered, assure high bioavailability, bypass first-pass metabolism or harsh gastrointestinal environments, as well as maximize the speed of onset. Intramuscular (IM) delivery can be preferred to intravenous delivery when initiating intravenous access is difficult or impossible. Drugs can be injected intramuscularly using a syringe or an automated delivery device (autoinjector). Investigation into the IM delivery dynamics of these methods may guide further improvements in the performance of injection technologies. Two porcine model studies were conducted to compare differences in dispersion of injectate volume for different methods of IM drug administration. The first study compared the differences in the degree of dispersion and uptake of injectate following the use of a manual syringe and an autoinjector. The second study compared the spatial spread of the injected formulation, or dispersion volume, and uptake of injectate following the use of five different autoinjectors (EpiPen^® [0.3 mL], EpiPen^® Jr [0.3 mL], Twinject^® [0.15 mL, 0.3 mL], and Anapen^® 300 [0.3 mL]) with varying needle length, needle gauge, and force applied to the plunger. In the first study, the autoinjector provided higher peak volumes of injectate, indicating a greater degree of dispersion, compared with manual syringe delivery. In the second study, EpiPen autoinjectors resulted in larger dispersion volumes and higher initial dispersion ratios, which decreased rapidly over time, suggesting a greater rate of uptake of injectate than the other autoinjectors. The differences in dispersion and uptake of injectate are likely the result of different functional characteristics of the delivery systems. Both studies demonstrate that the functional characteristics of the method for delivering IM injections impact the dispersion and uptake of the material injected, which could significantly affect the pharmacokinetics and, ultimately, the effectiveness of the drug.

[Anaphylaxis: recognize and treat early]

Allergic emergencies in children are now more frequent and unpredictable and can cause death by anaphylactic shock, bronchospasm, and airway angioedema. Despite the publication of recent guidelines, many studies show that caregivers are still not at ease with the management of anaphylaxis and intramuscular administration of adrenaline. The prognosis depends on the early diagnosis of anaphylaxis and adrenaline administration before cardiorespiratory failure. The biphasic course of anaphylaxis requires systematic hospitalization of at least 6–24 hours depending on severity. To prevent recurrence, each child with anaphylaxis should permanently be in possession of two unexpired self-injectable adrenaline devices with a demonstration and written instructions on its use. Close collaboration between emergency departments, allergist, and family is essential to adapt therapeutic education and allergen avoidance to the allergen identified. This article focuses on opportunities to improve the skills of caregivers and standardize the management of anaphylaxis by proposing a practical definition and a therapeutic strategy based on Ring grading of severity.