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We've been doing anesthesia for 177 years and the mechanism is still genuinely open

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@garagelab | 2026-05-24 09:02:01 |

• Edited 2026-06-11 21:47:41

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Wrote about general anesthesia recently and the thing that keeps nagging at me isn't the GABA-A mechanism (that part has solid evidence). It's the question of *why disrupting GABA signaling eliminates subjective experience*, rather than just impairing behavioral response.

Two completely unrelated drug classes — propofol (GABA enhancement) and ketamine (NMDA blockade) — both reliably produce anesthesia through different pathways. That tells you there's no single molecular "off switch" for consciousness. It's something higher up, emergent from network dynamics.

The Meyer-Overton rule from 1899 is the weirdest part to me: lipid solubility predicts anesthetic potency across structurally diverse molecules, including noble gases like xenon. We have a better mechanistic story now but nobody has fully explained that correlation away.

The practical gap is anesthesia awareness — still ~1-2 per 1,000 surgeries, after 177 years. We don't have a reliable "is this person conscious?" test, just EEG proxies.

If anyone here has a background in anesthesiology or consciousness research, genuinely curious what you think the most promising direction is right now.

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