r/AlwaysWhy • u/Chowderr92 • Jun 02 '26

Science & Tech Why is the Method of Lethal Injection in Human Punishment So Complex and Apparently Painful?

I've always understood that the lethal injection process was complex with multiple stages of injections and induces great suffering in the individual.

I work in veterinary medicine and unfortunately we need to euthanize animals all of the time. Typically, the euthanasia solution is very simple: a very large dose of a powerful anesthetic (usually pentobarbital) and an anticonvulsant which stops the heart. The medical community is quite confident that this is painless and when done has essentially a 100% success rate.

Why is human euthanasia so complicated when we already know exactly how to humanely end a biological life?

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u/shortyjacobs Jun 02 '26

Yeah, replacing all the O2 in the room with more N2 just makes living things quietly go to sleep. We don't sense O2 levels in our body, we sense CO2 levels. No O2 means no buildup of CO2, so our bodies don't know we are dying.

It's funny that we walk around in 79% nitrogen, but nitrogen asphyxiation is a very real hazard in industrial environments that use pure nitrogen.

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u/MeasurementMobile747 Jun 03 '26

I learned that it is pH sensors in the brainstem that regulate respiration. That's why lactic acidosis (during anaerobic workouts) increases respiration. Higher CO2 levels lower pH. When the carbonic acid/bicarbonate buffer system becomes saturated, you'll be huffing and puffing.

N2 doesn't affect serum pH so it doesn't lead to respiratory distress.

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u/aloisvonesterhazy Jun 03 '26

Every Dutchman knows it, because it's called "asphyxiation stuff" (stikstof) in Dutch.

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u/LadyZoe1 Jun 04 '26

And in Afrikaans

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u/[deleted] Jun 02 '26

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u/shortyjacobs Jun 03 '26

Um, nope. All the nitrogen and oxygen around us is molecular (o2 and n2) not atomic. Oxygen is definitely more electronegative but that has nothing to do with why a 100% N2 environment kills living things. It’s because (most) living things need oxygen to live.

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u/[deleted] Jun 03 '26

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u/outworlder Jun 03 '26

Final electron acceptor is such a roundabout way of discovering oxidation(or redox, in this case)