Six breaths a minute, pinpoint pupils, a man unconscious in a park. Ventilate before you reverse. This Atlas edition walks the whole emergency: the triad and its mimics, the μ-receptor cascade and the pre-Bötzinger complex (why breathing is the lethal target), the naloxone ladder — four tenths to one point two intravenous, two milligrams intranasal — titrated to respiration not alertness, the two clocks where the opioid outlasts the antidote, the fentanyl era, methadone QT and tramadol seizures, pregnancy, and take-home naloxone: five thousand patients, four deaths, one-in-a-thousand needed.…
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