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Just because the onset of action of fentanyl is < 5 min, does not mean that death must occur within 5 minutes, for the fentanyl to be the cause of death. A gunshot wound takes effect in < 1 second, yet it's not true to say, "If they didn't die instantly, the bullet didn't cause them to die." The effect of instant onset gunshot wounds fatal effects can take seconds, minutes, hours, days or months. But if it takes longer, you don't blame it on something else. It's still death from a GSW and the person who pulled the trigger is still responsible.At least one of those high dose cases the patient lived for says after the dose though. I think that is sufficient to show that the dose is not universally fatal...
Similarly, a drug can cause apnea, hypoxia and associated brain and cardiac injury that is severe and life threatening but may not be fatal, instantly. Hypoxia can lead to cardiac ischemia and infarct. They may not go into v-fib right away. That might happen hours or days later. Similarly, brain ischemia might be severe and render a patient nearly brain dead, but still with unconscious brain stem and breathing function. It can take hours, or days for the ischemia to progress to killing the remaining brain cells that control breathing. Fentanyl doesn't cause people to flatline. It causes either apnea or severely depressed respirations, which leads to hypoxia, then organ ischemia. That can take much longer than 5 minutes to progress to death, even if the onset of action is within 5 minutes.
It makes no sense to say their medical conditions are so severe, they're going to die so quickly, it makes no difference how big of a drug dose they got. But they're going to take so long to die, they need massive doses of pain medicine, near fatal or fatal doses. But it it takes longer for them to die of the medical conditions than you thought, you're still going to blame the medical conditions. Yet, if it takes longer for the fentanyl to kill them than you expected, you're not going to blame the fentanyl.
You guys are looking for every reason under the sun to explain away the potential lethality of ultra-high doses of fentanyl. But the first thing you'd wonder if an intern under you gave a 1,000 mcg of fentanyl to an unintubaned patient and walked way, is, "Did he kill that patient?"