Opioid overdose vs Benzodiazepine overdose
How to tell Opioid overdose and Benzodiazepine overdose apart when a board question makes them look alike.
Opioids depress respirations and cause miosis; isolated benzodiazepines sedate with ataxia but usually preserve respirations.
Side by side
Opioid overdose causes CNS depression, respiratory depression, miosis, bradycardia/hypotension, decreased bowel sounds, and response to naloxone.
Isolated benzodiazepine overdose causes CNS depression, slurred speech, ataxia, and sedation with usually preserved respirations; respiratory compromise is more likely with alcohol or opioid coingestion.
Mu-opioid receptor activation suppresses brainstem respiratory drive and decreases sympathetic/GI activity.
Benzodiazepines enhance GABA-A receptor frequency of chloride-channel opening, producing sedation and impaired coordination.
Low respiratory rate, pinpoint pupils, hypoxia, track marks, fentanyl/heroin exposure, and naloxone response support opioid toxicity.
Sedation, ataxia, normal pupils or mild nystagmus, relatively stable vital signs, and isolated benzodiazepine exposure support benzodiazepine toxicity.
The trap
Flumazenil can precipitate seizures in benzodiazepine-dependent patients or mixed overdoses, so supportive care is usually preferred.
The repair move
For sedative overdose, check respiratory drive and pupils before choosing opioid versus benzodiazepine.
Try a free question
CoreA patient is found unresponsive with respiratory rate 6/min, oxygen saturation 82%, pinpoint pupils, and suspected fentanyl exposure. Which overdose is most likely?
Show answer and explanation
Answer: A. Opioid overdose. CNS depression with respiratory depression and miosis supports opioid overdose.
Why the other choices are tempting
- B. Isolated benzodiazepine overdose usually preserves respirations and does not cause pinpoint pupils.
- C. Cocaine intoxication causes sympathomimetic agitation.
- D. Alcohol withdrawal causes autonomic hyperactivity after cessation.
- E. Amphetamine intoxication causes prolonged sympathomimetic toxicity.
Flashcards
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What triad supports opioid overdose?
CNS depression, respiratory depression, and miosis support opioid overdose.
What reverses opioid overdose?
Naloxone reverses opioid overdose but may require repeated dosing or monitoring.
Quick answers
What is the fastest way to tell Opioid overdose from Benzodiazepine overdose?
Opioids depress respirations and cause miosis; isolated benzodiazepines sedate with ataxia but usually preserve respirations.
What is the key clue for Opioid overdose?
Opioid overdose causes CNS depression, respiratory depression, miosis, bradycardia/hypotension, decreased bowel sounds, and response to naloxone.
What is the key clue for Benzodiazepine overdose?
Isolated benzodiazepine overdose causes CNS depression, slurred speech, ataxia, and sedation with usually preserved respirations; respiratory compromise is more likely with alcohol or opioid coingestion.
What is the common trap with Opioid overdose vs Benzodiazepine overdose?
Flumazenil can precipitate seizures in benzodiazepine-dependent patients or mixed overdoses, so supportive care is usually preferred.