Operative terminology and post-operative management approaches applied to hepatic surgery: Trainee perspectives

Table 2 Abridged version of West Haven criteria

HE grade	Mental state
1	Mild confusion, slowing of ability to do mental tasks, e.g., serial 7’s
2	Drowsiness, inappropriate behaviour
3	Somnolent but rousable, marked confusion
4	Coma

Reproduced with permission from reference Ferenci et al[79].