A client has an anaphylactic reaction after receiving IV penicillin, what does the nurse conclude as the caus… - SCTIMST Staff Nurse - 2016

SCTIMST Staff Nurse - 2016

Medical Surgical Nursing

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Appeared in: SCTIMST Staff Nurse - 2016

Explanation

Anaphylaxis is a Type I (immediate) hypersensitivity reaction.
This type of reaction requires a prior exposure to an antigen (in this case, penicillin), which is called sensitization.
During sensitization, the immune system produces specific IgE antibodies against the antigen.
These IgE antibodies attach to mast cells and basophils.
Upon re-exposure, the antigen (penicillin) binds to the IgE on these cells, triggering a rapid, massive release of histamine and other mediators.
This mediator release causes the life-threatening symptoms of anaphylaxis within minutes.

Option A: The term 'atopic' typically refers to a genetic predisposition for allergic diseases like asthma, hay fever, and eczema, often related to environmental allergens. While anaphylaxis is an allergic reaction, this option is less precise than describing the specific immunologic mechanism.
Option B: Passive immunity involves receiving pre-formed antibodies from another source (e.g., from mother to fetus, or through an injection of immune globulin). In an allergic reaction, the individual's own immune system actively produces the antibodies.
Option D: The primary immune response to produce a significant amount of antibodies takes days to weeks, not minutes. An anaphylactic reaction is immediate because the antibodies are already present from a previous exposure.

Clinical Relevance

Nursing practice connection: Safe nursing care depends on performing Pathophysiology of Type I Hypersensitivity Reaction (Anaphylaxis) in the correct sequence, documenting the action clearly, and monitoring for the expected response.
Always assess for drug allergies before administering any new medication, especially antibiotics like penicillin, which are a common cause of anaphylaxis.
Recognizing the signs of anaphylaxis (e.g., sudden hives, difficulty breathing, hypotension) and acting quickly by stopping the drug and administering epinephrine is a critical life-saving nursing skill.
What if the client states they have no known allergies? The nurse must still monitor the client closely, as a previous sensitizing exposure may have been unknown or forgotten (e.g., exposure to penicillin mold in food).

How to Approach the Question

First, identify the key clinical event: an 'anaphylactic reaction' occurring immediately after 'IV penicillin' administration.
Recall the pathophysiology of anaphylaxis. It is a Type I hypersensitivity reaction, which is characterized by two stages: sensitization (first exposure) and immediate reaction (subsequent exposure).
Analyze the options based on this two-stage model.
Option A is too general. 'Atopy' is a predisposition, not the direct cause.
Option B describes 'passive immunity,' which is the transfer of antibodies, not the body's own production in response to an allergen.
Option D suggests antibodies are made 'when the infusion was instituted.' This is incorrect; antibody production is a slow process, while anaphylaxis is immediate.

Concept Tested & Keywords

Concept Tested: Pathophysiology of Type I Hypersensitivity Reaction (Anaphylaxis)
Stem keywords: anaphylactic reaction, IV penicillin
Lead-in keywords: cause
Clinical cues: The immediate onset of the reaction after receiving an IV drug is a classic sign of a pre-sensitized Type I hypersensitivity.

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