WorksheetsUnderstanding Allergic Reactions
Total questions: 70
Worksheet time: 35mins
What is an allergic reaction?
A response of the immune system to fight infection
A manifestation of tissue injury resulting from interaction between an antigen and an antibody
A process that eliminates foreign particles from the bloodstream
An inappropriate but harmless immune response
Which of the following best defines an "allergy"?
A harmful immune system response to substances normally harmless
A response that produces antibodies against foreign antigens
A reaction caused only by pathogens like bacteria
A condition where no immune response occurs
What is the role of an allergen in an allergic reaction?
It eliminates harmful antigens from the body
It causes manifestations of allergy and is considered harmless by the body
It reduces the immune system response
It is responsible for producing antibodies to fight infection
How does the body recognize an antigen?
As a harmful substance causing immediate immune suppression
As a foreign invader that induces the production of antibodies
As a harmless protein in the body
As an inactive mediator waiting for primary mediators
Which statement describes "Primary Mediators" during an allergic reaction?
They are inactive precursors formed after secondary mediators
They are preformed and found in mast cells or basophils
They are released in response to secondary mediators
They are only formed in the bloodstream during an allergic reaction
What describes "Secondary Mediators" in an allergic reaction?
They are found preformed in mast cells
They are inactive precursors formed or released in response to primary mediators
They are always active at the start of the reaction
They neutralize the allergens to prevent harm
Which of the following are the two types of chemical mediators involved in allergic reactions?
Primary and Tertiary Mediators
Primary and Secondary Mediators
Antigens and Allergens
Antibodies and Antigens
What is the role of histamine as a primary mediator in allergic reactions?
It causes dilation of blood vessels, erythema, and localized edema
It stimulates nerve cell fibers to produce pain
It causes smooth muscle contraction and bronchial constriction
It enhances the release of serotonin and bradykinin
When do histamine’s effects peak after antigen contact?
1-2 minutes
5-10 minutes
30-45 minutes
60 minutes
What is the function of prostaglandins as a primary mediator?
They attract eosinophils to the site of allergens
They produce smooth muscle contraction, vasodilation, and increase capillary permeability
They initiate platelet aggregation and leukocyte infiltration
They act as severe vasoconstrictors in smooth muscle
What is the role of the eosinophil chemotactic factor of anaphylaxis?
It sensitizes pain receptors during inflammation
It attracts eosinophils to the site of allergens and releases cytotoxic protein
It causes contraction of bronchial smooth muscles
It releases serotonin to mediate allergic response
What is the function of the platelet-activating factor during hypersensitivity reactions?
It stimulates nerve cell fibers to produce pain
It induces smooth muscle relaxation
It initiates platelet aggregation and leukocyte infiltration
It triggers the release of histamine from mast cells
What are leukotrienes responsible for in the inflammatory response?
Increasing vascular permeability and producing pain
Causing smooth muscle contraction, bronchial constriction, and mucus secretion
Initiating platelet aggregation and sensitizing pain receptors
Causing vasodilation and releasing cytotoxic protein
How do leukotrienes compare to histamine in causing bronchospasm?
They are equally potent as histamine
They are less potent than histamine
They are 100 to 1000 times more potent than histamine
They have no role in causing bronchospasm
What effect does bradykinin have during the allergic response?
It decreases capillary permeability and reduces inflammation
It stimulates nerve cell fibers, causing pain and increased vascular permeability
It releases histamine and serotonin from mast cells
It triggers the wheal-and-flare reaction in the skin
What is the primary function of serotonin as a secondary mediator?
It acts as a severe vasoconstrictor and causes bronchial smooth muscle contraction
It induces platelet aggregation and increases leukocyte activity
It enhances histamine production and inflammatory response
It causes vasodilation and smooth muscle relaxation
Which of the following mediators is released first during an immune response?
Leukotrienes
Histamine
Bradykinin
Serotonin
Which statement accurately describes hypersensitivity disorders?
They occur immediately after the first exposure to an allergen.
They cause a normal immune response to harmful antigens.
They are overreactions or inappropriate responses to antigens.
They occur without causing tissue damage or harm.
Which of the following is NOT one of the four types of hypersensitivity disorders?
Anaphylaxis
Cytotoxic
Autoimmune suppression
Delayed or cellular
What characterizes Type I (Anaphylactic) Hypersensitivity?
It is mediated by IgE antibodies and occurs within minutes of antigen exposure.
It is caused by immune complexes depositing in tissues.
It involves T cells and occurs 48-72 hours after exposure.
It leads to blood transfusion incompatibility.
What are the symptoms associated with Type I Hypersensitivity reactions?
Cell lysis and tissue damage
Edema, hypotension, bronchospasm, and cardiovascular collapse
Delayed erythema and induration
Autoantibody formation and joint inflammation
Type II (Cytotoxic) Hypersensitivity is mediated by which antibodies?
IgE
IgG and IgM
T cells
Histamine
Which situation can cause a Type II hypersensitivity reaction?
Injection of purified protein derivative (PPD) for TB testing
Exposure to an allergen causing immediate mast cell activation
Blood transfusion incompatibility where anti-B antibodies attack infused type B blood
Formation of immune complexes deposited in tissues
What causes Type III (Immune Complex) Hypersensitivity reactions?
IgE antibodies binding to mast cells
Insoluble immune complexes formed by antigens and antibodies that trigger inflammation
Cytotoxic antibodies targeting tissue membranes
T cells releasing delayed inflammatory mediators
Which conditions are examples of Type III hypersensitivity reactions?
Myasthenia gravis and idiopathic thrombocytopenia
Allergic rhinitis and asthma
Rheumatoid arthritis and systemic lupus erythematosus
Contact dermatitis and graft-versus-host disease
How long does it take for a Type IV (Delayed) Hypersensitivity reaction to occur?
Immediately after exposure to an antigen
5-10 minutes after antigen contact
24 hours after exposure
48-72 hours after exposure
What is a common example of a Type IV hypersensitivity reaction?
Medication reactions
Contact dermatitis from poison ivy
Blood transfusion incompatibility
Atopic dermatitis
What mediates Type IV hypersensitivity reactions?
IgG and IgM antibodies
IgE antibodies and mast cells
T cells
Insoluble immune complexes
Which hypersensitivity reaction involves delayed erythema and induration as seen in TB testing?
Type I
Type II
Type III
Type IV
Which factors should be assessed when evaluating hypersensitivity disorders?
Age, medications, and allergies
Medications, body temperature, and pulse rate
Immunization status, age, and cholesterol levels
Recent illness, heart rate, and pain levels
What diagnostic test is MOST commonly used for Type I hypersensitivity reactions?
Serum-specific IgE test
Skin tests such as prick or scratch tests
Eosinophil count
CBC (Complete Blood Count)
Which condition does an eosinophil level greater than 5% to 10% indicate?
Anemia
Allergic disorders
Autoimmune disorders
Bacterial infections
What is the significance of high total serum IgE levels?
They indicate inflammation from bacterial infection.
They support the diagnosis of allergic disease.
They show decreased immune function.
They confirm autoimmune diseases.
Which of the following is TRUE about serum-specific IgE tests (RAST)?
It requires stopping anti-allergic medications before testing.
It poses a high risk of systemic allergic reactions.
It detects free antigen-specific IgE in serum.
It provides immediate results with low costs.
What is the main disadvantage of provocative testing for hypersensitivity disorders?
Limited allergen selection and lack of immediate results
High risk of systemic reactions and severe symptoms like bronchospasm
Requirement of multiple sessions over weeks
Decreased antigen stability during testing
Which diagnostic method involves direct administration of suspected allergens to sensitive tissues?
Intradermal testing
Provocative testing
Prick or scratch testing
Serum-specific IgE test
What is a positive result in skin testing for hypersensitivity disorders?
Increased white blood cell count
Wheal-and-flare reaction at the testing site
Painful induration lasting more than 72 hours
High total serum IgE levels
Which precaution must be taken during skin testing for allergens?
Ensuring the patient is on antihistamines
Having emergency equipment ready for potential anaphylaxis
Using the back as the testing site for better allergen stability
Delaying the test if the patient has a history of infections
What are the advantages of serum-specific IgE tests over skin tests?
Immediate results and lower costs
Decreased risk of systemic reactions and stability of antigens
Higher sensitivity and broader allergen selection
Ability to detect IgG antibodies as well
When should skin testing NOT be performed for hypersensitivity disorders?
During periods of bronchospasm
After stopping anti-allergy medications
After a recent illness
When eosinophil levels are elevated
Which of the following is TRUE about positive skin test reactions?
They are evidenced by wheals with erythema or pseudopodia projections.
They are always a definitive indicator of hypersensitivity disorders.
They are unaffected by antihistamines or corticosteroids.
They occur only during Type II hypersensitivity reactions.
Which factor can cause false-positive results during skin testing?
Delayed hypersensitivity response
Improper preparation or administration of allergens
Lack of antibodies due to immune suppression
Excessive eosinophil count
What effect do corticosteroids and antihistamines have on skin testing?
They enhance the accuracy of the results.
They suppress skin test reactivity, leading to false-negative results.
They increase sensitivity to allergens.
They prevent systemic reactions caused by allergens.
What is an example of a Type IV hypersensitivity test?
Prick skin test for pollen allergies
Intradermal serum IgE test
PPD test for tuberculosis
Provocative challenge test
What defines atopy in allergic disorders?
A reaction mediated by IgM antibodies
A genetic predisposition to mount an IgE response to innocuous proteins
A non-genetic allergic response to contact allergens
A delayed immune response involving T cells
Which of the following disorders is classified as atopic?
Latex allergy
Asthma
Tuberculosis
Rheumatoid arthritis
Which clinical sign is a hallmark symptom of anaphylaxis?
Joint swelling and pain
Severe flushing, hives, low blood pressure, and airway narrowing
Chronic fatigue and erythema
Localized edema lasting 24-48 hours
Which medication is most commonly associated with anaphylaxis?
Ibuprofen
Aspirin
Penicillin
Acetaminophen
Which of the following can trigger an anaphylactic reaction?
Exercise
Exposure to tree nuts
Insect stings like bee or wasp bites
All of the above
What is the most important initial action when a patient experiences an anaphylactic reaction?
Administer antihistamines immediately.
Stop the causative agent or medication and use epinephrine.
Place the patient in a recovery position.
Perform skin testing to confirm the allergen.
What is a key pathophysiological change during anaphylaxis?
Bronchodilation and increased mucus production
Vasodilation, increased vascular permeability, and smooth muscle constriction
Activation of B cells and decreased platelet aggregation
Delayed histamine release and tissue repair
Which systemic manifestation is associated with severe anaphylaxis?
Peripheral tingling and mild nasal congestion
Anxiety, itching, and mild flushing
Bronchospasm, laryngeal edema, hypotension, and seizures
Periorbital swelling and tearing of the eyes
What symptom progression is expected in untreated severe anaphylaxis?
Gradual improvement of symptoms
Development of anaphylactic shock leading to cardiac arrest and coma
Rapid increase in antibody production
Recovery with mild symptoms of flushing and anxiety
Which symptom differentiates mild anaphylaxis from moderate anaphylaxis?
Peripheral tingling and tearing of the eyes
Anxiety, warmth, and flushing
Laryngeal edema and bronchospasm
Severe hypotension and cyanosis
Which of the following is a hallmark sign of laryngeal edema during anaphylaxis?
Narrowing of the airway causing severe dyspnea
Vasodilation leading to peripheral swelling
Pruritus and mucus secretion
Seizures and abdominal cramping
What role do histamine, prostaglandins, and leukotrienes play in anaphylaxis?
They reduce vascular permeability and promote tissue healing.
They cause flushing, angioedema, hypotension, and bronchoconstriction.
They inhibit platelet activation to reduce systemic inflammation.
They increase mucus secretion and prevent airway narrowing.
What is a defining feature of systemic anaphylaxis progression?
Symptoms develop over 24 hours with mild respiratory issues.
Symptoms are sudden in onset and progress in severity over minutes to hours.
Symptoms remain localized to the skin with mild pruritus.
Symptoms begin with delayed reactions but do not progress further.
What clinical symptom is associated with mucus secretion during anaphylaxis?
Periorbital swelling
Nasal congestion and bronchoconstriction
Cyanosis and seizures
Severe vomiting and diarrhea
Which severe systemic reaction is also known as anaphylactic shock?
Peripheral tingling and pruritus
Flushing, warmth, and mild anxiety
Severe hypotension, dysphagia, and seizures
Increased vascular permeability and erythema
Which of the following symptoms typically occurs first in mild anaphylaxis?
Severe laryngeal edema
Peripheral tingling and fullness in the mouth and throat
Sudden cardiac arrest
Bronchospasm and cyanosis
What is the primary medication used to manage anaphylaxis?
Antihistamines
Corticosteroids
Epinephrine
Bronchodilators
Which measure is critical during the observation phase after an anaphylactic reaction?
Encouraging physical activity to prevent rebound reactions
Monitoring for rebound reactions 4 to 8 hours post-recovery
Administering antibiotics to prevent infection
Performing CPR on all patients as a precaution
What is the purpose of vasopressors during anaphylaxis management?
To dilate bronchial airways and improve breathing
To maintain blood pressure and hemodynamic stability
To reduce mucus secretion in the airway
To prevent systemic infections
What is a key nursing intervention for managing anaphylaxis?
Assessing airway, breathing, and circulation (ABC) and vital signs
Delaying emergency medications until symptoms progress
Educating patients to stop antihistamines before testing
Providing long-term antibiotics to prevent recurrence
Why is patient education important for anaphylaxis prevention?
To avoid exposure to allergens and know how to use an EpiPen
To recognize systemic infections before they occur
To reduce vascular permeability in future reactions
To increase sensitivity to allergens over time
What precaution should a patient take after experiencing anaphylaxis?
Undergo monthly skin testing
Wear a medic alert bracelet
Carry oxygen therapy equipment at all times
Schedule weekly corticosteroid injections
What is the role of intravenous fluids in the management of anaphylaxis?
They reduce vascular permeability and histamine release.
They stabilize blood pressure and maintain hemodynamic status.
They directly relieve bronchoconstriction and airway narrowing.
They prevent angioedema and urticaria from worsening.
Which symptom indicates a rebound anaphylactic reaction post-treatment?
Sudden cardiac arrest within 2 hours
Peripheral tingling and flushing
Recurrence of respiratory distress and hypotension
Localized itching and rash without systemic symptoms
When should a rapid response team or provider be notified during an anaphylactic reaction?
When there is an increase in edema or respiratory distress
After administering the second dose of epinephrine
If vital signs remain stable for 30 minutes
Before initiating emergency measures
What is an essential component of patient teaching for anaphylaxis management?
Learning CPR techniques for emergencies
Administering corticosteroids during mild reactions
Carrying an EpiPen auto-injector at all times
Scheduling regular immunizations to prevent anaphylaxis
