Nremt Aemt Level Quiz: Allergic Reactions And Anaphylaxis

What this quiz covers

This quiz focuses on Allergic Reactions And Anaphylaxis, giving you a quick way to practice the rules, question types, and explanations that matter most for Nremt Aemt Level.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. The patient's subjective level of anxiety and fear.
2. The size and redness of the cutaneous urticaria.
3. Blood pressure and the quality of breathing. (correct answer)
4. The patient's core body temperature and skin signs.

Explanation: The primary purpose of epinephrine in anaphylaxis is to reverse life-threatening hypotension (via alpha-1 vasoconstriction) and respiratory compromise (via beta-2 bronchodilation and reduced edema). Therefore, the most critical parameters to reassess are the blood pressure and the patient's respiratory status (rate, effort, lung sounds) to determine if the intervention was effective. Skin signs (B) and anxiety (A) resolve more slowly and are not immediate life threats.

Question 2

1. Epinephrine 1:1,000, 0.3 mg IM in the lateral thigh (correct answer)
2. Epinephrine 1:10,000, 1 mg IV push as a single dose
3. Epinephrine 1:1,000, 0.1 mg IM in the deltoid muscle
4. Epinephrine 1:1,000, 1 mg IM repeated every two minutes

Explanation: This question tests the management of allergic reactions and anaphylaxis at the AEMT level. Allergic reactions and anaphylaxis involve hypersensitivity to allergens, requiring prompt identification and intervention. Common symptoms include hives, respiratory distress, and hypotension. In this scenario, the patient's symptoms and history indicate anaphylaxis, necessitating immediate administration of epinephrine. The correct answer is choice A because it aligns with AEMT guidelines for immediate management of anaphylaxis, ensuring rapid symptom relief with the standard adult dose. Choice B is incorrect because it suggests an inappropriate sequence of interventions, which can delay critical treatment and worsen patient outcomes. To help students: Emphasize the importance of recognizing signs of anaphylaxis and following established protocols. Practice scenarios should include identifying critical symptoms and correctly administering emergency medications. Watch for common errors such as confusing symptom severity and misapplying intervention sequences.

Question 3

1. Administer the 0.15 mg autoinjector into the anterolateral thigh. (correct answer)
2. Withhold epinephrine and transport, as the dose may be too high.
3. Request orders from medical control to administer the adult 0.3 mg dose.
4. Attempt to administer only half the contents of the 0.15 mg autoinjector.

Explanation: The patient's weight is 33 lbs, which is 15 kg. The standard pediatric dose of epinephrine for anaphylaxis is 0.01 mg/kg. For this child, the calculated dose is 15 kg * 0.01 mg/kg = 0.15 mg. Therefore, the 0.15 mg auto-injector is the correct dose. Withholding treatment (B) or giving an incorrect dose (C, D) would be dangerous.

Question 4

1. Epinephrine 1:1,000, 0.5 mg IM in the forearm near the rash
2. Epinephrine 1:1,000, 0.03 mg IM in the lateral thigh
3. Epinephrine 1:10,000, 0.3 mg IV push over 30 seconds
4. Epinephrine 1:1,000, 0.3 mg IM in the lateral thigh (correct answer)

Explanation: This question tests the management of allergic reactions and anaphylaxis at the AEMT level. Allergic reactions and anaphylaxis involve hypersensitivity to allergens, requiring prompt identification and intervention. Common symptoms include hives, respiratory distress, and hypotension. In this scenario, the patient's symptoms and history indicate anaphylaxis, necessitating immediate administration of epinephrine. The correct answer is choice D because it aligns with AEMT guidelines for immediate management of anaphylaxis, ensuring rapid symptom relief with the standard adult dose. Choice C is incorrect because it suggests an inappropriate sequence of interventions, which can delay critical treatment and worsen patient outcomes. To help students: Emphasize the importance of recognizing signs of anaphylaxis and following established protocols. Practice scenarios should include identifying critical symptoms and correctly administering emergency medications. Watch for common errors such as confusing symptom severity and misapplying intervention sequences.

Question 5

1. It stabilizes mast cells, preventing them from releasing more histamine.
2. It competitively blocks H1 histamine receptors on target cells. (correct answer)
3. It provides a beta-2 adrenergic effect, causing bronchodilation.
4. It causes systemic vasoconstriction through alpha-1 adrenergic effects.

Explanation: Diphenhydramine is a first-generation antihistamine. Its primary mechanism of action is to competitively block H1 histamine receptors, preventing histamine released from mast cells from binding and causing symptoms like hives, itching, and vasodilation. It does not prevent histamine release (A). Beta-2 effects (C) are characteristic of albuterol, and alpha-1 effects (D) are characteristic of epinephrine.

Question 6

1. Give antihistamine first because epinephrine has already been used once
2. Administer 0.1 mg epinephrine IM to minimize tachycardia risk
3. Reassess and administer a repeat IM epinephrine dose per protocol if symptoms persist (correct answer)
4. Observe on scene until hives resolve before initiating transport

Explanation: This question tests the management of allergic reactions and anaphylaxis at the AEMT level. Allergic reactions and anaphylaxis involve hypersensitivity to allergens, requiring prompt identification and intervention. Common symptoms include hives, respiratory distress, and hypotension. In this scenario, the patient's symptoms and history indicate anaphylaxis, necessitating immediate administration of epinephrine. The correct answer is choice C because it aligns with AEMT guidelines for immediate management of anaphylaxis, ensuring rapid symptom relief through reassessment and repeat epi if needed. Choice D is incorrect because it suggests an inappropriate sequence of interventions, which can delay critical treatment and worsen patient outcomes. To help students: Emphasize the importance of recognizing signs of anaphylaxis and following established protocols. Practice scenarios should include identifying critical symptoms and correctly administering emergency medications. Watch for common errors such as confusing symptom severity and misapplying intervention sequences.

Question 7

1. A history of a previous severe allergic reaction to bee stings.
2. A complaint of significant anxiety and a feeling of impending doom.
3. Development of swelling and redness localized to the sting site.
4. A complaint of abdominal cramping and sudden nausea. (correct answer)

Explanation: Anaphylaxis is defined by the involvement of two or more body systems. The patient already has skin involvement (urticaria). The development of gastrointestinal symptoms (abdominal cramping, nausea) indicates a second system is involved, meeting the criteria for anaphylaxis and warranting epinephrine. A history of severe reactions (A) is a risk factor but does not define the current event. Anxiety (B) is a common symptom but is less objective than GI distress. Localized swelling (C) is an expected finding of a simple allergic reaction, not systemic anaphylaxis.

Question 8

1. 0.4 mg of 1:1,000 solution administered intravenously.
2. 0.5 mg of 1:10,000 solution administered intramuscularly.
3. 0.4 mg of 1:1,000 solution administered intramuscularly. (correct answer)
4. 0.3 mg of 1:1,000 solution administered subcutaneously.

Explanation: First, convert the patient's weight: 88 lbs / 2.2 lbs/kg = 40 kg. The correct dose is 0.01 mg/kg, so 40 kg * 0.01 mg/kg = 0.4 mg. The correct concentration for intramuscular injection is 1:1,000. Intravenous administration of this concentration is dangerous (A). The 1:10,000 concentration is for IV/IO use in cardiac arrest, not IM administration (B). The subcutaneous route is no longer recommended due to less reliable absorption compared to IM (D).

Question 9

1. Insertion of a supraglottic airway.
2. Administration of a nebulized bronchodilator.
3. Application of continuous positive airway pressure (CPAP). (correct answer)
4. Initiating assisted ventilations with a bag-valve mask.

Explanation: This patient is showing signs of impending respiratory failure (accessory muscle use, tachypnea, hypoxia) despite initial treatment. CPAP is an excellent intervention in this scenario. It helps to stent open the smaller airways, improves gas exchange, and significantly reduces the work of breathing, potentially preventing the need for intubation. A nebulizer (B) is also helpful but does less to support the patient's ventilatory effort. A supraglottic airway (A) or BVM (D) are incorrect as the patient is still conscious and breathing spontaneously.

Question 10

1. Administer IM epinephrine, apply high-flow oxygen, establish IV access, and prepare for airway management. (correct answer)
2. Establish IV access, administer a fluid bolus, then give IM epinephrine.
3. Apply CPAP, administer nebulized albuterol, and then give IM epinephrine.
4. Administer IV diphenhydramine, apply high-flow oxygen, and transport rapidly.

Explanation: When you encounter a patient with signs of anaphylaxis—urticaria, angioedema, stridor, hypotension, and altered mental status—time is critical. The priority is immediate epinephrine administration followed by supportive airway and circulatory management. Answer A provides the correct sequence: IM epinephrine first (the definitive treatment for anaphylaxis), high-flow oxygen for hypoxemia, IV access for additional medications and fluids, and airway preparation since stridor indicates upper airway compromise that could progress to complete obstruction. Answer B delays epinephrine by prioritizing IV access and fluids first. While IV access is important, epinephrine is the life-saving intervention that must be given immediately. Fluid resuscitation alone won't reverse the underlying anaphylactic process causing vasodilation and increased capillary permeability. Answer C suggests CPAP and albuterol, but this patient's respiratory distress is from upper airway swelling (evidenced by stridor), not bronchospasm. CPAP could worsen upper airway obstruction, and delaying epinephrine is dangerous. Albuterol may help with any bronchospasm component but isn't the primary treatment. Answer D omits epinephrine entirely, relying only on diphenhydramine (an antihistamine). While antihistamines are adjunctive therapy for anaphylaxis, they work too slowly for life-threatening presentations. This patient needs immediate epinephrine to counteract the severe cardiovascular and respiratory compromise. Remember: In anaphylaxis, epinephrine is always first-line treatment. Don't let other interventions delay this critical medication—every minute counts when airway compromise and shock are present.

Question 11

1. The anaphylactic reaction is worsening and now affecting the cardiac system.
2. He is developing a biphasic reaction requiring an additional epinephrine dose.
3. He is experiencing an anxiety attack secondary to the overall stressful situation.
4. These are expected side effects from the beta-adrenergic stimulation of epinephrine. (correct answer)

Explanation: When evaluating a patient who has received epinephrine, you must understand that epinephrine is a powerful sympathomimetic drug that stimulates both alpha and beta adrenergic receptors throughout the body. This stimulation produces predictable physiological effects that can be mistaken for worsening pathology. The correct answer is D because the patient's symptoms of tachycardia ("racing heart") and tremors are classic beta-adrenergic effects of epinephrine. Beta-1 stimulation increases heart rate and contractility, while beta-2 stimulation can cause tremors and anxiety-like symptoms. The fact that his breathing is unlabored, blood pressure is normal, and urticaria hasn't worsened suggests the allergic reaction isn't progressing—these are simply medication side effects. Answer A is incorrect because worsening anaphylaxis would typically present with hypotension, worsening respiratory distress, and progression of skin symptoms, not isolated tachycardia with stable vital signs. Answer B is wrong because biphasic reactions involve a return of allergic symptoms hours later, not immediate cardiac effects following epinephrine administration. Answer C misses the mark because while anxiety can cause similar symptoms, the timing immediately after epinephrine administration and the specific symptom pattern point to direct pharmacological effects rather than psychological response. Remember that epinephrine's side effects often mimic emergency symptoms. When a patient develops new symptoms immediately after epinephrine administration but vital signs remain stable and the original condition isn't worsening, consider medication effects first. This distinction is crucial for appropriate treatment decisions in the field.

Question 12

1. Wait for the student's parents to arrive on scene to provide consent for treatment.
2. Withhold the patient's injector and administer epinephrine from the EMS drug box.
3. Instruct the school nurse that she is legally required to administer the medication.
4. Immediately assist the patient in self-administering their own prescribed auto-injector. (correct answer)

Explanation: When you encounter anaphylaxis scenarios on the NREMT, focus on rapid intervention and understanding consent laws for minors in emergency situations. Time is critical in anaphylaxis, and you must navigate both medical urgency and legal considerations. The correct action is D) Immediately assist the patient in self-administering their own prescribed auto-injector. Since the patient is alert and conscious, they can provide their own consent and self-administer their medication. As an AEMT, you can legally assist them with their own prescribed medication. This approach respects patient autonomy while ensuring rapid treatment of a life-threatening condition. A is dangerous because waiting for parents during anaphylaxis wastes precious time. Minors can consent to emergency treatment when alert and competent, and implied consent applies in life-threatening situations when parents aren't immediately available. B is incorrect because using the patient's own prescribed auto-injector is preferred and legal. There's no medical or legal reason to withhold their medication in favor of yours, and this approach might actually delay treatment. C misunderstands scope of practice and legal authority. You cannot compel school personnel to administer medications, and the nurse may have valid institutional policies preventing her from acting. Her hesitancy shouldn't delay your appropriate intervention. NREMT Strategy: Remember that conscious, alert minors can consent to emergency treatment, especially for life-threatening conditions. When you see anaphylaxis questions, prioritize speed of intervention while respecting the simplest legal pathway to treatment.

Question 13

1. To dilute the concentration of the circulating allergen in the bloodstream.
2. To counteract profound vasodilation and systemic capillary leakage. (correct answer)
3. To increase the glomerular filtration rate to accelerate histamine excretion.
4. To provide a direct vehicle for the rapid IV administration of epinephrine.

Explanation: Anaphylactic shock is a form of distributive shock. Massive histamine release causes systemic vasodilation and increases capillary permeability, allowing fluid to shift from the intravascular to the interstitial space. An isotonic fluid bolus helps to restore intravascular volume lost to this leakage and vasodilation. The other options describe incorrect or secondary mechanisms.

Question 14

1. Anaphylactic shock causing profound peripheral vasodilation.
2. A vasovagal response triggered by pain or fear from the sting. (correct answer)
3. A toxic reaction due to a large volume of injected venom.
4. Hypoglycemia causing an altered mental status and diaphoresis.

Explanation: The key findings that differentiate this from anaphylaxis are the normal blood pressure and the relative bradycardia (HR 58). Anaphylactic shock is characterized by hypotension and tachycardia. A vasovagal episode is a common response to a painful or frightening stimulus, causing a temporary drop in heart rate and blood pressure (which has resolved here) leading to syncope. The absence of other allergic signs (urticaria, stridor) further supports this diagnosis.

Question 15

1. A non-allergic, bradykinin-mediated angioedema. (correct answer)
2. A blunted response to the administration of epinephrine.
3. A falsely low SpO2 reading due to peripheral vasoconstriction.
4. Potentiating the effects of diphenhydramine, leading to severe sedation.

Explanation: When you encounter a patient with angioedema who's taking an ACE inhibitor like lisinopril, you need to understand that ACE inhibitors can cause a specific type of non-allergic swelling through a completely different mechanism than typical allergic reactions. ACE inhibitors work by blocking the enzyme that breaks down bradykinin, a substance that causes vasodilation and increased vascular permeability. When bradykinin accumulates, it can trigger angioedema affecting the face, lips, tongue, and potentially the airway. This is bradykinin-mediated angioedema, not an IgE-mediated allergic reaction, which is why answer A is correct. Answer B is incorrect because lisinopril doesn't interfere with epinephrine's mechanism of action. Epinephrine will still work through alpha and beta receptors regardless of ACE inhibitor use. Answer C is wrong because while ACE inhibitors affect blood pressure, they don't cause the peripheral vasoconstriction that could interfere with pulse oximetry readings. Answer D is incorrect because lisinopril doesn't have significant drug interactions with diphenhydramine that would cause enhanced sedation. The critical insight here is recognizing that ACE inhibitor-induced angioedema often doesn't respond to traditional allergic reaction treatments like epinephrine, antihistamines, or steroids because it's not histamine-mediated. This type of angioedema requires different management approaches and has a higher likelihood of airway involvement. Always consider medication history when evaluating angioedema patients, as the underlying mechanism determines your treatment approach.

Question 16

1. Epinephrine 1:1,000, 0.3 mg IM in the lateral thigh (correct answer)
2. Epinephrine 1:1,000, 0.05 mg IM in the lateral thigh
3. Epinephrine 1:10,000, 0.3 mg IV push
4. Epinephrine 1:1,000, 1 mg IM once, then reassess after one hour

Explanation: This question tests the management of allergic reactions and anaphylaxis at the AEMT level. Allergic reactions and anaphylaxis involve hypersensitivity to allergens, requiring prompt identification and intervention. Common symptoms include hives, respiratory distress, and hypotension. In this scenario, the patient's symptoms and history indicate anaphylaxis, necessitating immediate administration of epinephrine. The correct answer is choice A because it aligns with AEMT guidelines for immediate management of anaphylaxis, ensuring rapid symptom relief with the standard adult dose. Choice C is incorrect because it suggests an inappropriate sequence of interventions, which can delay critical treatment and worsen patient outcomes. To help students: Emphasize the importance of recognizing signs of anaphylaxis and following established protocols. Practice scenarios should include identifying critical symptoms and correctly administering emergency medications. Watch for common errors such as confusing symptom severity and misapplying intervention sequences.

Question 17

1. A second dose of IM epinephrine to augment the first dose.
2. Administration of IV diphenhydramine to block histamine receptors.
3. Initiation of an IV normal saline bolus for hydration.
4. Administration of a nebulized beta-2 agonist like albuterol. (correct answer)

Explanation: While epinephrine has both alpha and beta effects (including beta-2 for bronchodilation), persistent wheezing after initial stabilization is best treated with a targeted beta-2 agonist like albuterol. This directly addresses the bronchospasm. A second dose of epinephrine (A) is not indicated as the patient's blood pressure is stable. Diphenhydramine (B) primarily treats urticaria, not wheezing. A fluid bolus (C) is for hypotension.

Question 18

1. It is less likely to cause an allergic reaction compared to other fluid types.
2. It rapidly shifts into the intracellular space to rehydrate cells.
3. It is osmotically balanced to remain primarily in the intravascular space. (correct answer)
4. It contains dextrose to provide an immediate energy source for the patient.

Explanation: Isotonic solutions (like normal saline or lactated Ringer's) have a similar solute concentration to blood plasma. This osmotic balance causes them to remain primarily in the intravascular and interstitial spaces, making them ideal for expanding vascular volume during shock. Hypotonic solutions (like D5W) would shift into cells and be ineffective for resuscitation. Allergic reactions to crystalloids are extremely rare.

Question 19

1. A subjective complaint of a "lump in the throat." (correct answer)
2. A respiratory rate that has increased from 16 to 22.
3. An SpO2 reading that has dropped from 99% to 96%.
4. Visible angioedema of the lips and outer mouth.

Explanation: A complaint of a lump in the throat, throat tightness, or difficulty swallowing is a key early symptom of laryngeal edema (airway swelling). This indicates impending airway compromise and is an absolute indication for epinephrine. While changes in vitals (B, C) and visible swelling (D) are concerning, the subjective feeling of throat closure is a direct and early indicator of this specific life-threat.

Question 20

1. The administered epinephrine can cause rebound hypertension.
2. Anaphylactic symptoms may recur hours later without further exposure. (correct answer)
3. The diphenhydramine will cause profound sedation, making him unsafe.
4. He requires a formal allergy panel, which can only be done at the hospital.

Explanation: A significant percentage of anaphylactic reactions can be biphasic, meaning symptoms can recur 1 to 72 hours after the initial reaction has resolved, without any re-exposure to the allergen. This is the most critical reason for the patient to be observed in a hospital setting. While medication side effects (A, C) are possible and future testing (D) is important, the risk of a biphasic reaction is the most immediate threat to the patient's life.