10 free Paramedic practice questions: Toxicology and Overdose Management

A heart rate above 60: 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: 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: 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: 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. What this patient still needs is the enzyme reactivator, which atropine alone does not bring.

Intravenous sodium bicarbonate: Bicarbonate is the antidote that goes 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: 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: 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: Naloxone is the reversal agent that comes to mind in any sedated overdose. Naloxone acts at opioid receptors and has no effect on a benzodiazepine.

Activated charcoal by mouth: 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: Cyanide drives a profound lactic acidosis, and bicarbonate is the buffer 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: 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: 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: This reflects the older teaching that charcoal gets given to any awake ingestion patient as a blanket practice. Current field protocols have moved away from that routine approach, which is the exact outdated pattern option B replaces.

It is equally effective regardless of how much time has passed since ingestion: Charcoal does adsorb toxin in the gut, but that adsorption only works well within a limited window after ingestion, often within roughly the first hour; once significant absorption has already occurred, giving charcoal accomplishes little, so effectiveness is not equal across time.

It eliminates the need for airway monitoring in poisoned patients: Charcoal can reduce further toxin absorption, but it does nothing to protect the airway itself. A poisoned patient with a decreased level of consciousness still needs continuous airway monitoring, and charcoal administration actually adds aspiration risk rather than removing the need for that monitoring.

Induce vomiting immediately: This comes from older teaching that treated poisoning with induced emesis as a first-line field step. With an unknown pill and only 20 minutes elapsed, you cannot rule out a caustic or aspiration risk, and current EMS practice no longer supports inducing vomiting in the field at all.

Administer activated charcoal followed by induced vomiting: Activated charcoal is a legitimate decontamination tool for many oral toxin ingestions, so this option looks reasonable at first. Following it with induced vomiting undoes the treatment, expelling the charcoal before it can adsorb anything, and it still exposes the patient to the same aspiration risk that rules out emesis on its own.

Allow the patient to induce their own vomiting since they are conscious: This appeals because the patient is conscious and requesting it, making autonomy feel like the deciding factor. Being conscious now does not protect the airway if reflexes change during emesis, and the aspiration and caustic-injury risk exists no matter who initiates the vomiting.

Administer haloperidol intramuscularly: Haloperidol is the go-to for agitation from a primary psychiatric cause and would visibly calm this patient, which is the appeal. With a temperature of 104°F and stimulant-driven seizure risk already present, a butyrophenone works against you: it impairs heat dissipation and lowers the seizure threshold, and it does nothing to blunt the catecholamine surge itself.

Administer naloxone intramuscularly: Naloxone reverses opioid toxicity, which presents with pinpoint pupils, slow shallow respirations, and a depressed level of consciousness. This patient has dilated pupils, a respiratory rate of 26, and agitation instead, the opposite picture, so there is no opioid effect present for naloxone to act on.

Administer flumazenil intravenously: Flumazenil reverses benzodiazepine sedation, the direct opposite of what this patient needs. Nothing here points to benzodiazepine toxicity, and stripping away GABA activity in a sympathomimetic crisis already at seizure risk can precipitate a seizure rather than prevent one.

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.