History and exam
Key diagnostic factors
common
history of opioid use disorder and dependence
People who misuse opioids on a regular basis or who are addicted to opioids are at risk of overdose.
Regular users of opioids who have had a period of abstinence from use (e.g., on release from prison or discharge from a treatment program) are at increased risk of overdose.
miosis
Constricted pupils usually seen.
bradypnea
Respiratory rate of <12 breaths/minute in an unconscious patient presenting via emergency medical services best predicts a response to naloxone and overdose.[27]
altered mental status
Including drowsiness and sleepiness.
dramatic response to naloxone
Diagnostic of opioid overdose.
Other diagnostic factors
common
fresh needle marks
Suggestive of recent intravenous injection.
drug paraphernalia nearby
Such as syringes or smoking equipment.
decreased gastrointestinal motility
Signs and symptoms include nausea and vomiting, constipation, and abdominal pain.
old track marks on arms and legs
Evidence of previous intravenous drug use may suggest recent injection.
uncommon
pulmonary rales
May indicate acute respiratory distress syndrome.
frothy pink sputum
May indicate acute respiratory distress syndrome.
seizures
Can occur with overdose of meperidine, propoxyphene, and tramadol.
dysrhythmias
Can be caused by sodium channel blockade with propoxyphene and can be associated with significant respiratory compromise.
Risk factors
strong
opioid use disorder and dependence
People who misuse opioids on a regular basis or who are addicted to opioids are at risk of overdose. Withdrawal symptoms during abstinence in opioid-tolerant people reinforce use of the drug, and they often need higher doses to obtain the desired drug effect. Opioids are often obtained from untested, nonpharmaceutical sources and the purity may vary greatly, making it difficult to know the exact dose of the drug and avoid an overdose.
recent abstinence in chronic users
Regular users of opioids who have had a period of abstinence from use (e.g., on release from prison or discharge from a treatment program) are at increased risk of overdose. Tolerance to opioids is lost during periods of abstinence, making it difficult to judge the amount of opioid required to obtain a desired effect. The risk is increased further with the variation in purity of illicit opioids.[10][11]
weak
chronic pain
Patients who experience chronic pain are often treated with long-acting opioids. As tolerance increases, along with analgesia requirements, patients are often switched between opioid preparations of different potencies and different routes, which increases the risk of iatrogenic overdose.
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