10 free AEMT practice questions: Allergic Reaction and Anaphylaxis

Anaphylaxis, since hives cover more than one part of the body: How much skin is involved feels like it should matter, and widespread hives do look alarming. Area is not the measure. A body covered in hives with nothing else involved is still one system, and one system is a localized reaction.

An anaphylactic reaction in its early stage, ahead of the airway signs: Calling it early anaphylaxis feels cautious, and caution is usually the right instinct. The problem is that it turns a classification into a prediction. Treat the airway and pressure findings you actually have, and reassess for the ones you do not.

A biphasic reaction returning after an exposure earlier in the day: A biphasic reaction is symptoms coming back hours after a reaction that was already treated. This patient has had one reaction that has not gone away and come back, so there is no first round for this to be the second of.

Give the antihistamine now and hold epinephrine for a falling pressure: Reserving a stimulating drug for the sickest moment sounds like exactly the judgment an experienced provider would show. The pressure is already falling and the airway is already involved, so the sickest moment has arrived, and holding the drug lets a treatable reaction keep stressing the heart.

Give a nebulized bronchodilator, which carries less cardiac risk here: A bronchodilator does open the lower airways and it feels gentler on a coronary patient. It is not gentler in the way that matters, since albuterol also drives the heart rate up, and it leaves the swelling and the vessel dilation completely untreated.

Establish a line and give fluid, then reassess before any epinephrine: Fluid is a real part of anaphylaxis care and it does not stress the coronaries, which makes it the safest looking action on the page. Fluid cannot shrink a dilated container, so the pressure keeps drifting down while the minutes epinephrine works best in go by.

Give a nebulized bronchodilator to finish clearing the lower airways: Treating the remaining wheeze is reasonable thinking, and a bronchodilator is in your scope. The wheezing has already eased and the number that has not moved is the blood pressure, so this treats the part of the patient that is improving.

Place the patient on the side and recheck the pressure in five minutes: Repositioning and rechecking is safe and costs nothing, which is what makes it attractive. A systolic of 82 with a pulse of 124 after the drug is a patient who needs volume, not another five minutes of observation.

Hold further treatment, since the airway findings have already cleared: The airway clearing really is the most dangerous half turning around, so that reads as the call going well. Perfusion is still failing, and the reaction keeps leaking volume out of the vessels while you wait.

The epinephrine itself has to be watched for several hours afterward: Monitoring after a strong drug sounds like standard care and it puts the focus on something concrete. The concern is the reaction coming back rather than the drug lingering, and epinephrine is short acting, which is the opposite of a drug you would babysit for hours.

The sting site has to be checked for infection before the day is out: Sting sites do get infected and a wound check is honest advice, so this feels responsible. It also makes the trip sound optional and routine, which undersells the actual reason and gives the patient an easy way to decline.

The blood pressure tends to drop once the swelling starts coming down: Pressure drops are the feared event here, so this has the right anxiety attached to it. It is not how the reaction behaves. Swelling coming down is improvement, and there is no rule that the pressure falls afterward.

Before epinephrine, since blocking histamine stops the whole cascade: Blocking the chemical that causes the problem is elegant reasoning and it is how the drug actually works. The block only stops histamine from attaching to receptors it has not reached yet, and it arrives far too slowly to matter while a tongue is swelling.

Alongside epinephrine, so both drugs reach the tissue at the same time: Giving both at once sounds efficient, and in the hospital the patient often does get both. The risk is what happens on scene, where setting up a second drug delays the first one, and the first one is the only one that reverses the reaction.

In place of epinephrine when the reaction is caught within ten minutes: Catching a reaction early does make everything easier, so the instinct that timing matters is right. Nothing substitutes for epinephrine at any point in the reaction, and an early reaction is exactly the one where the drug works best.

Onset speed reflects the amount of allergen rather than the severity: Dose and effect usually do go together, so tying speed to the amount of allergen sounds mechanically sensible. Speed of onset is used as a severity marker rather than as a measure of how much got in, and a tiny exposure can produce a very fast reaction.

A slower onset is more dangerous, since the reaction builds unnoticed: Slow and quiet problems really are dangerous in a lot of medicine, which gives this a ring of truth. Allergic reactions run the other way, since the faster ones are the ones already flooding tissue with histamine when you arrive.

Onset speed predicts which body system the reaction will involve first: Wanting a clue about which system gets hit first is a reasonable thing to want on this call. Onset speed does not sort airway from circulation from skin, so this offers information the finding cannot give.

Set up a nebulized bronchodilator for the narrowing that is developing: A bronchodilator is useful when bronchospasm is the trouble and it is a normal part of this call later. The findings here are a hoarse voice and a swelling face, which sit above the vocal cords where a nebulized drug cannot reach.

Establish a line and start an isotonic crystalloid bolus for the swelling: Fluid is the next step for anaphylaxis that stays hypotensive after epinephrine, so the rule exists. This pressure is holding at 106 systolic, and fluid does nothing about tissue swelling, so this spends your hands on the wrong problem.

Lay the patient flat and recheck the pressure in about five minutes: Lying flat with a recheck is the right answer for the hypotensive version of this patient. Laying a patient flat whose face and throat are swelling makes the airway harder to manage at the moment it needs the most room.

Run the fluid wide open, since the vessels have lost their volume: A line is already in and a systolic of 76 makes fluid feel urgent, which is what makes this the tempting one. The volume was never lost, it moved into the tissue through leaking vessels, so fluid alone chases a problem that keeps regenerating.

Give an antihistamine through the line to stop the histamine effect: An antihistamine aims straight at the chemical named in the mechanism, and the line makes it easy to give. Antihistamines are hospital and advanced life support additions and never come before epinephrine, and this one would work far too slowly here.

Raise the legs and recheck the pressure before committing to a drug: Leg elevation is the right position for this patient and costs almost nothing to do. Doing it instead of giving the drug delays the treatment, and there is nothing about this presentation that a recheck would clarify.

Epinephrine and a bronchodilator reach the narrowed airway equally fast: Both drugs do work quickly, so comparing them on speed sounds like the right axis. Speed is not what separates them here, since a bronchodilator never reaches swollen tissue above the vocal cords no matter how fast it is given.

Anaphylaxis is far more common than asthma among adults who wheeze: Choosing the more common condition is usually sound reasoning in a close call. Asthma is far more common than anaphylaxis among people who wheeze, so this gets the frequency backwards, and the argument rests on consequences rather than counts.

A bronchodilator cannot be given once epinephrine is already on board: Ruling out the second drug makes the choice sound final and high stakes. Nothing stops you from giving a bronchodilator after epinephrine, and doing exactly that is common once the reaction is treated and wheezing remains.

A localized allergic reaction, since breathing and pressure are normal: Normal breathing and a normal pressure are genuinely reassuring numbers, and they are the ones everyone checks. A localized reaction stays in one place and one system, and this reaction has already reached the skin and the gut at once.

Food poisoning, since vomiting and cramping came on after a meal: Vomiting and cramping after a meal is the classic food poisoning story, so the setting fits. Food poisoning takes hours rather than twelve minutes and does not produce hives, and the timing here points straight at an allergen.

A biphasic reaction that will declare itself over the next few hours: Biphasic reactions are worth knowing about and this patient may still have one later. That term describes symptoms coming back after treatment appeared to work, and this reaction is the first one and it is happening now.