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Opioid overdose occurs when excessive amounts of opioids depress the central nervous system to life-threatening levels, causing respiratory depression, altered mental status, and potential death. This medical emergency requires immediate recognition and intervention with naloxone (Narcan) to reverse the effects and restore adequate ventilation.
Opioids bind to mu-opioid receptors in the brainstem, particularly in the medulla oblongata, which controls respiratory drive and cardiac function. Excessive opioid binding suppresses the respiratory center's response to carbon dioxide and oxygen levels, leading to hypoventilation, hypoxemia, and eventual respiratory arrest if untreated.
The classic triad of opioid overdose includes pinpoint pupils (miosis), respiratory depression with slow or absent breathing, and altered mental status ranging from somnolence to coma. Immediate administration of naloxone, an opioid receptor antagonist, can rapidly reverse these effects, though multiple doses may be needed for long-acting or high-potency opioids, and patients require continued monitoring as naloxone's duration is shorter than most opioids.