Anaesthesia Depth Stages

Guedel's classic stages of ether anaesthesia, with modern correlates.

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digraph an {
  rankdir=TB;
  graph [bgcolor=transparent];
  node [shape=box, style="rounded,filled", fontname=Inter, fontsize=10];

  S1 [label="Stage 1 — Analgesia\n(induction)", fillcolor="#dbeafe"];
  S2 [label="Stage 2 — Excitement\n(disinhibition)", fillcolor="#fee2e2"];
  S3 [label="Stage 3 — Surgical anaesthesia\n(planes 1-4)", fillcolor="#dcfce7"];
  S4 [label="Stage 4 — Overdose\n(medullary failure)", fillcolor="#7f1d1d", fontcolor="white"];

  S1 -> S2 -> S3 -> S4 [label="deepening"];
  S3 -> S2 [label="emergence", style=dashed];
}