- Despite the patient having taken oral antihistamines, what is the most appropriate treatment for the paramedic to provide?
Answer: Administer IM epinephrine because of respiratory system involvement.
Anaphylaxis is defined by the involvement of two or more body systems (in this case, skin and respiratory) after exposure to a likely allergen. The presence of shortness of breath, regardless of how mild, requires immediate treatment with epinephrine. Oral antihistamines have a slow onset and are insufficient to manage a systemic reaction with respiratory compromise. Epinephrine is the first-line, life-saving intervention. Albuterol is an adjunct, and observation alone is inappropriate.
- Shellfish allergy: hives and itching; vitals normal—what additional information is most helpful before treatment?
Answer: Any throat tightness, voice change, wheezing, or lightheadedness since onset
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on pre-treatment assessment (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, hives and itching with normal vitals require checking for subtle progression. The correct answer involves inquiring about symptoms like throat tightness or wheezing. A common distractor might involve preferences for medication form, which is incorrect for urgency. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and ask key questions. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- What is the most critical piece of information to convey to the patient to justify the need for transport to a hospital?
Answer: A biphasic reaction can occur, causing symptoms to return hours after they have resolved.
A significant percentage of patients with anaphylaxis (up to 20%) experience a biphasic reaction, where symptoms recur 1 to 72 hours after the initial reaction resolves, without any re-exposure to the allergen. This is the most compelling medical reason for transport and observation in an emergency department, as the recurrent symptoms can be as severe or worse than the initial presentation. The other options are either incorrect or not the primary justification for transport.
- New antibiotic started; hours later urticaria and crampy abdominal pain occur—what additional information is most helpful?
Answer: Exact time and dose of the new medication and any prior reactions
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on history-taking and assessment (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, the patient's urticaria and abdominal pain after a new antibiotic suggest a possible allergic reaction, making details about the medication crucial. The correct answer involves gathering information on the timing, dose, and prior reactions to guide treatment decisions. A common distractor might involve unrelated history like diet or family asthma, which is incorrect as it does not directly inform the allergic response. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and practice targeted questioning. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- 20 kg child, anaphylaxis, no IV. IM epinephrine 1:1000 dose?
Answer: 0.2 mg = 0.2 mL
For anaphylaxis, IM epinephrine 1:1000 is given at 0.01 mg/kg. A 20 kg child needs 20 x 0.01 = 0.2 mg. Since 1:1000 means 1 mg/mL, that is 0.2 mL. The tempting wrong answer is 0.2 mg = 2.0 mL, which mistakenly uses the 1:10,000 IV concentration instead of 1:1000 IM.
- After a bee sting, wheezing and BP 84/50 develop; which action should the paramedic take first?
Answer: Administer 0.3 mg IM epinephrine (1 mg/mL) and begin high-flow oxygen
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on rapid assessment and intervention for life-threatening symptoms (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, the patient's symptoms—such as wheezing and hypotension—indicate anaphylaxis, necessitating immediate epinephrine administration and oxygen therapy. The correct answer involves recognizing these critical symptoms and prioritizing epinephrine as the first-line treatment along with high-flow oxygen. A common distractor might involve suggesting antihistamines or albuterol first, which is incorrect because they do not address the systemic effects as quickly as epinephrine. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and practice rapid epinephrine administration. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- What is the most important consideration when administering epinephrine to this specific patient?
Answer: The benefits of treating life-threatening anaphylaxis outweigh the potential cardiac risks.
Anaphylaxis is a life-threatening emergency, and epinephrine is the only effective first-line treatment. While epinephrine's beta-1 effects (increased heart rate and contractility) can increase myocardial oxygen demand and pose a risk in patients with cardiac disease, the profound hypoxia and hypotension of untreated anaphylaxis pose a much greater and more immediate threat of cardiac ischemia or arrest. Therefore, the standard dose of epinephrine should be administered, as the benefits clearly outweigh the risks. Withholding this life-saving medication is not appropriate.
- New medication reaction: hives, nausea, and dizziness; BP 90/58—what is the primary treatment for anaphylaxis?
Answer: 0.3 mg IM epinephrine (1 mg/mL) with oxygen and readiness for airway support
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on treatment for borderline symptoms (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, hives, nausea, dizziness, and mild hypotension suggest anaphylaxis. The correct answer involves IM epinephrine with oxygen and airway readiness. A common distractor might involve observation only, which is incorrect with systemic signs. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and err on caution. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- Bee sting anaphylaxis treated with epinephrine; BP improves but wheezing persists—what action should occur next?
Answer: Administer nebulized albuterol and continue close reassessment during transport
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on ongoing management after initial treatment (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, improved blood pressure but persistent wheezing indicate the need for adjunctive therapy. The correct answer involves administering nebulized albuterol to address residual bronchospasm. A common distractor might involve withholding bronchodilators, which is incorrect as they complement epinephrine. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and practice post-treatment reassessment. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- The child's wheezing has not improved. What is the most appropriate next step?
Answer: Administer a second dose of epinephrine 0.18 mg IM via syringe.
The patient has signs of systemic reaction involving two body systems (skin and respiratory), which constitutes anaphylaxis. The first-line treatment is epinephrine. The initial dose from the auto-injector has not resolved his respiratory symptoms. The correct pediatric dose for epinephrine 1:1,000 is 0.01 mg/kg, which for this 18 kg patient is 0.18 mg. Administering a second, correctly calculated dose is the priority. Albuterol is an important adjunct for wheezing but does not address the systemic inflammatory cascade. Antihistamines and steroids are secondary treatments and should not delay repeat epinephrine administration.
- Bee sting with increasing work of breathing; which airway approach is most appropriate initially?
Answer: High-flow oxygen and consider BVM support while preparing advanced airway backup
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on initial airway support (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, increasing work of breathing signals potential respiratory failure. The correct answer involves high-flow oxygen and preparation for assisted ventilation. A common distractor might involve withholding oxygen, which is incorrect for hypoxemia risks. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and escalate airway care. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- Shellfish allergy: itching and hives, no dyspnea; which symptom would most suggest progression to anaphylaxis?
Answer: Development of wheezing or stridor with increased work of breathing
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on recognizing progression (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, initial itching and hives without dyspnea require vigilance for worsening. The correct answer involves identifying wheezing or stridor as signs of progression. A common distractor might involve localized rash, which is incorrect for systemic involvement. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and monitor symptoms. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- Bee sting anaphylaxis: wheezing, hives, and hypotension; what is the primary treatment for anaphylaxis?
Answer: IM epinephrine (1 mg/mL) administered promptly, with airway and perfusion support
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on primary treatment protocols (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, wheezing, hives, and hypotension confirm anaphylaxis. The correct answer involves prompt IM epinephrine with supportive care. A common distractor might involve antihistamines first, which is incorrect for acute reversal. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and administer epinephrine. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- Given her history and persistent hypotension refractory to epinephrine, which medication should be considered?
Answer: Glucagon 1-2 mg IV to bypass the beta-adrenergic receptor site.
Patients on beta-blockers may have an attenuated or refractory response to epinephrine. Glucagon has positive inotropic and chronotropic effects that are not mediated by beta-adrenergic receptors. It can therefore be effective in treating refractory hypotension in anaphylaxis in this specific patient population. While other vasopressors might be used, glucagon is the classic and most appropriate next choice for a patient on beta-blockers.
- Bee sting with stridor and facial swelling; how should the paramedic manage the airway in this situation?
Answer: Provide oxygen, prepare suction, and be ready for advanced airway if worsening
This question tests paramedic-level understanding of allergic reactions and anaphylaxis, focusing on airway management in potential compromise (NREMT standard). Anaphylaxis is a severe, life-threatening allergic reaction that requires rapid identification and treatment with epinephrine. In this scenario, stridor and facial swelling indicate possible airway involvement, necessitating preparedness for deterioration. The correct answer involves providing oxygen, preparing suction, and readiness for advanced airway intervention. A common distractor might involve immediate intubation without preparation, which is incorrect as it skips supportive measures. Teaching strategies include training paramedics to quickly identify signs of anaphylaxis and practice airway management drills. Encourage familiarity with protocols and emphasize the importance of continuous patient monitoring after intervention.
- What is the paramedic's highest priority for this patient?
Answer: Immediate administration of IM epinephrine due to signs of airway compromise.
A 'lump in the throat' sensation (globus sensation) and hoarseness are ominous signs of developing laryngeal edema and potential airway compromise. Even with normal vital signs, these findings indicate a severe reaction requiring immediate intervention. Epinephrine is the only medication that can rapidly reverse this process. While airway preparation is crucial, the immediate priority is administering epinephrine to halt and reverse the swelling. Oxygen and antihistamines are secondary to this critical first step.
- In addition to high-quality CPR and airway management, what is the most appropriate initial medication and route for this patient?
Answer: Epinephrine 1 mg 1:10,000 IV/IO
This patient is in cardiac arrest, which is likely secondary to anaphylaxis (PEA). The standard ACLS algorithm for PEA arrest should be followed. The appropriate initial medication in any non-shockable cardiac arrest is epinephrine 1 mg of 1:10,000 solution via the IV or IO route, repeated every 3-5 minutes. While the arrest was caused by anaphylaxis, the priority is resuscitation from cardiac arrest, which uses the cardiac arrest dose and route of epinephrine, not the anaphylaxis dose/route. The IM route is ineffective in a patient without circulation.
- Which alternative diagnosis should the paramedic strongly consider, which presents similarly to an allergic reaction but is caused by bacterially-generated histamine in spoiled fish?
Answer: Scombroid poisoning
Scombroid poisoning results from the ingestion of fish (like tuna, mackerel, mahi-mahi) with high levels of histamine, produced by bacteria in improperly stored fish. The symptoms are nearly identical to an IgE-mediated allergic reaction because the underlying chemical mediator (histamine) is the same. The key diagnostic clue is often multiple people becoming ill after eating the same meal. While treatment is similar (antihistamines, supportive care), it's important to differentiate it from a true allergy.
- During transport, the patient's blood pressure suddenly drops to 70/40 mmHg. The IV line is patent and the infusion pump is working correctly. What is the most appropriate immediate action?
Answer: Increase the epinephrine infusion rate.
The patient is on a titratable vasopressor infusion for hemodynamic support post-anaphylaxis. A sudden drop in blood pressure indicates that the current dose is insufficient to overcome the vasodilation. The most direct and immediate action is to titrate the infusion upward to increase the vasopressor effect and restore blood pressure. While a fluid bolus may also be helpful, adjusting the primary vasoactive medication is the priority. Glucagon is for beta-blocker associated resistance, and steroids have no immediate effect on blood pressure.
- Which injection site provides the most reliable and rapid absorption of epinephrine?
Answer: The vastus lateralis muscle of the anterolateral thigh.
The anterolateral thigh (vastus lateralis muscle) is the recommended site for IM epinephrine administration in anaphylaxis. This large, well-vascularized muscle provides more rapid and reliable drug absorption compared to the deltoid or gluteal muscles. Subcutaneous injection has been shown to result in slower absorption and lower peak plasma concentrations, which is undesirable in a life-threatening emergency.
