West Haven criteria for semiquantitative grading of HE
| Grade | Criteria |
|---|---|
| 1 | Trivial lack of awareness, euphoria or anxiety, shortened attention span, impaired performance of addition (Sixty-seven percent of patients with cirrhosis may have minimal HE.) |
| 2 | Lethargy or apathy, minimal disorientation for time or place, subtle personality change, inappropriate behavior, impaired performance of subtraction |
| 3 | Somnolence to semistupor, but responsive to verbal stimuli; confusion; gross disorientation |
| 4 | Coma (unresponsive to verbal or noxious stimuli) |