An adolescent boy is admitted to the emergency department following a bee sting. He arrives with a body rash and 30 minutes later becomes short of breath. The nurse obtains vital signs with a blood pressure of 90/52 mm Hg, heart rate 130 beats/minute, and respiratory rate 40 breaths/minute. The client is exhibiting clinical manifestations of which type of immune reaction?
IgE-mediated response
Cell-mediated hypersensitivity
Autoimmune response
Type II hypersensitivity
The Correct Answer is A
Choice A reason: An IgE-mediated (Type I) hypersensitivity reaction, like anaphylaxis, occurs post-bee sting, with rapid onset of rash, shortness of breath, hypotension, and tachycardia. IgE antibodies trigger mast cell degranulation, releasing histamine, causing vasodilation, bronchoconstriction, and systemic symptoms, matching the client’s acute presentation.
Choice B reason: Cell-mediated (Type IV) hypersensitivity involves T-cells, causing delayed reactions like contact dermatitis, not rapid systemic symptoms. Bee sting reactions are immediate, driven by IgE, not T-cells. Rash, hypotension, and respiratory distress indicate anaphylaxis, not a delayed cell-mediated response.
Choice C reason: Autoimmune responses involve self-directed antibodies, as in lupus, not triggered by external allergens like bee stings. The client’s acute rash, hypotension, and respiratory distress suggest an IgE-mediated anaphylactic reaction, not an autoimmune process, which is unrelated to acute allergen exposure.
Choice D reason: Type II hypersensitivity involves antibody-mediated cytotoxicity, as in transfusion reactions, not allergen-induced systemic symptoms. Bee sting reactions are IgE-driven, causing immediate anaphylaxis with rash and hypotension, not cytotoxic damage, making Type II inappropriate for the client’s acute presentation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Serum creatinine assesses kidney function, not cardiac injury. While relevant for overall health, it does not confirm myocardial infarction. Troponin is specific to cardiac muscle damage, making it the priority test to diagnose acute coronary events in the emergency setting.
Choice B reason: Troponin levels are the gold standard for diagnosing myocardial infarction, as they rise within hours of cardiac muscle injury due to ischemia. High specificity for heart tissue makes troponin critical for confirming acute coronary syndrome, guiding urgent treatment in the emergency department.
Choice C reason: Complete blood count evaluates anemia or infection but is nonspecific for myocardial infarction. While useful for overall assessment, it does not detect cardiac injury. Troponin directly indicates heart muscle damage, making it the priority test for confirming the diagnosis.
Choice D reason: Blood glucose may be elevated in stress or diabetes but is not diagnostic for myocardial infarction. Cardiac-specific markers like troponin are essential for confirming heart injury, as glucose levels lack specificity for acute coronary events, making them secondary.
Correct Answer is A
Explanation
Choice A reason: Hyperthyroidism increases metabolic rate, causing tachycardia and potential arrhythmias due to elevated thyroid hormone levels stimulating cardiac beta-receptors. Monitoring heart rate and rhythm is critical to detect cardiovascular complications, guiding urgent treatment to prevent heart failure or atrial fibrillation.
Choice B reason: High-calorie snacks address weight loss in hyperthyroidism but are secondary to cardiovascular risks. Tachycardia and arrhythmias pose immediate threats, making heart rate monitoring the priority, as uncontrolled hyperthyroidism can lead to life-threatening cardiac events before nutritional needs are addressed.
Choice C reason: Supplemental oxygen is not routinely needed in hyperthyroidism unless respiratory distress occurs, which is rare. Elevated heart rate and arrhythmias are more immediate concerns, as hyperthyroidism’s cardiac effects are primary, making heart monitoring critical to prevent acute cardiovascular complications.
Choice D reason: Restricting fluid intake is inappropriate, as hyperthyroidism increases metabolism, risking dehydration. Heart rate monitoring is prioritized, as tachycardia and arrhythmias are direct, life-threatening effects of excess thyroid hormone, requiring immediate assessment to guide antithyroid therapy and prevent cardiac crises.
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