A teenage client is admitted to the emergency department following a bee sting. The client arrives with a body rash and 30 minutes later becomes short of breath.
The client's vital signs are a heart rate of 130 beats/minute, respirations of 40 breaths/minute, and a blood pressure of 90/52 mm Hg. The client is exhibiting clinical manifestations of which type of immune reaction?
Autoimmune response.
Type II hypersensitivity.
Cell-mediated hypersensitivity.
IgE response hypersensitivity.
The Correct Answer is D
Choice A rationale:
Autoimmune responses occur when the immune system mistakenly attacks the body's own tissues. They are not typically triggered by allergens like bee stings.
Autoimmune responses often develop slowly over time and present with symptoms related to the specific tissues being attacked.
The rapid onset of symptoms in this case, along with the specific symptoms of rash, shortness of breath, and low blood pressure, are not characteristic of an autoimmune response.
Choice B rationale:
Type II hypersensitivity reactions involve antibodies that target and destroy cells or tissues. These reactions often take hours or days to develop, rather than minutes.
Examples of type II hypersensitivity reactions include transfusion reactions, hemolytic disease of the newborn, and some autoimmune diseases.
The rapid onset of symptoms in this case is not consistent with a type II hypersensitivity reaction.
Choice C rationale:
Cell-mediated hypersensitivity reactions involve T cells that directly attack cells or tissues. These reactions typically take 1-3 days to develop.
Examples of cell-mediated hypersensitivity reactions include contact dermatitis (e.g., poison ivy), graft-versus-host disease, and some drug reactions.
The rapid onset of symptoms in this case, as well as the specific symptoms of rash, shortness of breath, and low blood pressure, are not characteristic of a cell-mediated hypersensitivity reaction.
Choice D rationale:
IgE response hypersensitivity reactions are the most immediate type of allergic reaction.
They are mediated by immunoglobulin E (IgE) antibodies, which bind to mast cells and basophils.
When an allergen (like bee venom) cross-links IgE antibodies on mast cells, it triggers the release of histamine and other inflammatory mediators.
These mediators cause vasodilation, increased vascular permeability, smooth muscle contraction, and mucus secretion, leading to the characteristic symptoms of an allergic reaction.
The rapid onset of symptoms in this case, including rash, shortness of breath, and low blood pressure, are consistent with an IgE-mediated hypersensitivity reaction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Anorexia is a common symptom of cirrhosis, but it is not the most immediate concern in a client with esophageal varices.
Anorexia can result from various factors, including impaired liver function, hormonal imbalances, early satiety due to ascites,
and nausea.
While it's important to address anorexia to maintain nutritional status, it doesn't directly indicate a life-threatening
complication like bleeding varices.
Choice B rationale:
Brown, foamy urine is a characteristic of kidney problems, specifically proteinuria.
It's not directly associated with esophageal varices or their complications.
While cirrhosis can affect kidney function due to fluid imbalances and impaired filtering, brown, foamy urine wouldn't be the
primary indicator of bleeding varices.
Choice C rationale:
Clay-colored stool is a sign of biliary obstruction, which can occur in cirrhosis due to impaired bile flow.
However, it's not a direct indicator of bleeding varices.
Clay-colored stool results from a lack of bile pigments in the stool, which give it its typical brown color.
Choice D rationale:
Hematemesis, or vomiting of blood, is the most critical symptom to monitor in a client with esophageal varices.
Here's why:
Esophageal varices are enlarged, swollen veins in the esophagus that develop due to increased pressure in the portal venous
system, a common consequence of cirrhosis.
These varices are fragile and prone to rupture, which can lead to massive, life-threatening bleeding.
Hematemesis is a clear sign that variceal bleeding has occurred and requires immediate intervention.
Correct Answer is A
Explanation
Choice A rationale:
Hemoglobin A1C (HbA1C) is a blood test that reflects a person's average blood glucose levels over the past 2-3 months. It's considered the gold standard for diagnosing and monitoring diabetes.
An HbA1C level of 8.29% is significantly elevated above the reference range of 4-5.99%, indicating a high probability of diabetes.
The patient's HbA1C has also increased from 7.59% three months ago, suggesting a worsening of glycemic control.
Diabetes mellitus is a chronic metabolic disorder characterized by elevated blood glucose levels due to impaired insulin production or action, or both.
Common symptoms of diabetes include increased thirst, frequent urination, fatigue, blurred vision, and slow-healing wounds.
Early diagnosis and treatment of diabetes are crucial to prevent complications such as heart disease, stroke, kidney disease, nerve damage, and vision loss.
Choice B rationale:
Hypoglycemia refers to abnormally low blood glucose levels, typically below 70 mg/dL. It's often caused by excessive insulin or medication, missed meals, or strenuous exercise.
The patient's HbA1C level of 8.29% does not support a diagnosis of hypoglycemia.
Choice C rationale:
Hyperglycemia refers to abnormally high blood glucose levels, typically above 180 mg/dL. It can be caused by diabetes, stress, infection, or certain medications.
While the patient's HbA1C level does indicate hyperglycemia, it's specifically the pattern of elevated HbA1C over time that points to a diagnosis of diabetes mellitus, rather than transient hyperglycemia.
Choice D rationale:
Prediabetes is a condition where blood glucose levels are higher than normal, but not high enough to be classified as diabetes. People with prediabetes are at increased risk of developing diabetes.
The patient's HbA1C level of 8.29% is above the threshold for prediabetes, which is typically 5.7-6.4%.
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