10 free Paramedic practice questions: Toxicology and Overdose Management

A heart rate above 60: A student picks this because atropine is the bradycardia drug, so heart rate feels like its natural target. The rate usually comes up long before the airway dries, so a crew that stops at 60 walks away from a patient still filling with secretions.

Dilation of the pupils: A student picks this because pinpoint pupils are the sign that flagged the poisoning, which makes them feel like the sign that should resolve first. Pupils respond unpredictably here and can stay small well after the airway has dried, so watching them will have you dosing past the endpoint or short of it with no way to tell which.

A systolic pressure above 100: A student picks this because the pressure is low and raising a low pressure feels like the point of anything you push. The hypotension comes from the poisoning itself and lifts as the cholinergic effects are blocked, so the pressure follows the treatment rather than measuring it, and atropine is not a pressor you titrate to a number.

Additional atropine boluses: A student picks this because more atropine is the reflex in any organophosphate call. The muscarinic findings have already resolved, and atropine has no effect at nicotinic receptors no matter how much of it you give.

Intravenous sodium bicarbonate: A student picks this because bicarbonate is the antidote they associate with a poisoned patient and a wide complex problem. Nothing here points at sodium channel blockade, and bicarbonate does nothing for acetylcholinesterase inhibition.

Intravenous diphenhydramine: A student picks this because twitching and abnormal muscle movement look like a dystonic reaction, which diphenhydramine does treat. These fasciculations come from nicotinic overstimulation, not from dopamine blockade.

Flumazenil titrated to alertness: A student picks this because an antidote exists and an antidote feels like the definitive answer. The seizure history is precisely the contraindication, and giving it here can produce seizures that were not happening before.

Naloxone by the intranasal route: A student picks this because naloxone is the reversal agent they reach for in any sedated overdose. Naloxone acts at opioid receptors and has no effect on a benzodiazepine.

Activated charcoal by mouth: A student picks this because charcoal is the generic answer for a recent ingestion. A drowsy patient with slurred speech is not reliably protecting the airway, and charcoal in that patient risks aspiration.

Intravenous sodium bicarbonate: A student picks this because cyanide drives a profound lactic acidosis and bicarbonate is the buffer they have on the truck. Buffering the blood does not give the cell back its ability to use oxygen, which is the actual injury here, and bicarbonate is not the antidote for this poisoning.

Nebulized ipratropium bromide: A student picks this because soot and a fire scene suggest an inhalation injury that needs a bronchodilator. There is no wheezing described, and a bronchodilator does nothing for a poisoning that acts inside the cell.

Naloxone for the altered mental status: A student picks this because an altered level of consciousness triggers a reflexive dose of naloxone. Nothing in this history points at an opioid, and a combative patient breathing at 32 is the opposite of the slow, quiet breathing an opioid produces.

It is administered routinely to every conscious patient with a suspected ingestion: It is not given routinely to every conscious ingestion patient. This reflects an outdated approach the exam specifically tests against.

It is equally effective regardless of how much time has passed since ingestion: Charcoal has a limited effective time window after ingestion, so timing matters.

It eliminates the need for airway monitoring in poisoned patients: Airway monitoring remains essential regardless of whether charcoal is given; charcoal itself carries aspiration risk in a patient with decreased level of consciousness.

Induce vomiting immediately: Inducing vomiting is not a field intervention regardless of the patient's presentation.

Administer activated charcoal followed by induced vomiting: Combining charcoal with induced vomiting still includes the unsupported and risky step of inducing emesis.

Allow the patient to induce their own vomiting since they are conscious: The risk of aspiration and caustic injury from vomiting applies regardless of who induces it or whether the patient is conscious; inducing vomiting is not the correct action.

Administer haloperidol intramuscularly: Haloperidol is a reasonable agent for agitation from a primary psychiatric cause and would visibly calm this patient, which is what makes it tempting. In stimulant toxicity it is worse on the two axes that matter most here: butyrophenones interfere with heat dissipation and lower the seizure threshold, in a patient already at 104 degrees and already at seizure risk. It also does nothing to the catecholamine surge driving the vital signs. Same visible effect, wrong physiology.

Administer naloxone intramuscularly: Naloxone is the antidote for opioid toxicity and is exactly right when the picture is respiratory depression, pinpoint pupils and a depressed level of consciousness. This patient is the mirror image on every one of those: agitated, breathing at 26, hypertensive, with dilated pupils. There is no opioid effect present to reverse, so naloxone has nothing to act on.

Administer flumazenil intravenously: Flumazenil reverses benzodiazepine sedation, which makes it the direct opposite of the key. Giving it to an agitated stimulant-toxic patient strips away whatever inhibitory braking remains and can precipitate seizures, which is why it is avoided in the prehospital setting generally. The key gives the benzodiazepine that quiets the surge; this option removes it.

Administer flumazenil intravenously: Flumazenil reverses benzodiazepines, and its narrow role is an isolated benzodiazepine overdose in a benzodiazepine-naive patient, which is a situation almost never confirmed in the field. This presentation was respirations of 4 with pinpoint pupils in a patient on daily methadone, which is opioid, and the opioid antagonist has already worked. Wrong receptor entirely, plus a real seizure risk.

Administer repeat naloxone until the patient is fully awake: Redosing naloxone until the patient is fully awake is the classic overshoot, and it feels like thoroughness. Ventilation is already adequate, so additional naloxone adds no benefit and risks precipitating acute withdrawal, with agitation and vomiting into an airway this patient may not yet be protecting. The key holds the gain it already has rather than chasing an endpoint that was never the goal.

Obtain a refusal of transport from the patient: A refusal is what many of these patients will ask for once they feel normal again, and with methadone it is the single most dangerous outcome. Naloxone fades in well under an hour while methadone lasts many, so the patient can slide back into respiratory depression with no one present. Decision-making capacity this soon after an unresponsive episode is also questionable, and the key keeps the patient watched through exactly the window when re-sedation happens.

Alpha-2 adrenergic agonist: An alpha-2 adrenergic agonist such as clonidine genuinely does produce bradycardia, hypotension, and sedation, and in children it can mimic an opioid closely enough to fool experienced providers. It does not drive the blood glucose up, so it leaves the single most specific number in this question unexplained. The key is selected by the hyperglycemia, and this class would leave the glucose alone.

Beta-adrenergic blocker: A beta blocker is by far the closest competitor, producing the same bradycardia and hypotension through a parallel mechanism on the same conduction system. Glucose is the separator and it runs the other direction: beta blockade impairs the release of stored glucose, so the level tends to be normal or low rather than 268 mg/dL. Same bedside presentation, opposite metabolic fingerprint, and the treatments diverge precisely at calcium.

Opioid pain medication: Opioid ingestion is right for the drowsy patient with pinpoint pupils and slow, shallow respirations, where naloxone is the answer and the respiratory rate is the finding that gives it away. This question rules it out twice over: pupils are 4 mm and reactive, and respirations are unlabored at 16 with adequate tidal volume. Opioids also do not produce a pulse of 42 with a glucose of 268 mg/dL. The key explains all three findings, while opioid toxicity explains only the drowsiness.

Withhold oxygen because the SpO₂ is normal: Withholding oxygen because the saturation looks normal would be correct only if the device measured what most people assume it measures. It is exactly the reasoning that lets these patients walk back into an exposure, and it is the entire teaching point of the item. The key treats the diagnosis the scene and the symptoms establish, not the number on the finger.

Give oxygen by nasal cannula at 2 liters each minute: Two liters by nasal cannula is appropriate when you want to nudge a mildly hypoxic patient's saturation up. The goal here is not to correct a saturation at all, it is to raise the delivered oxygen concentration high enough to shorten the time carbon monoxide stays bound, and a low-flow device barely moves that. Right treatment, wrong dose, which in this case means most of the benefit is lost.

Obtain a 12-lead ECG before deciding on oxygen: A 12-lead is a reasonable thing to obtain in carbon monoxide exposure, since the reduced oxygen delivery can precipitate ischemia, particularly in an older patient with coronary disease. It is not a gate on oxygen. Placing a diagnostic step in front of a treatment that is already clearly indicated only delays it.