West-Haven criteria for grading hepatic encephalopathy
| Grade of encephalopathy | Symptoms/signs |
|---|---|
| Grade 1 | Trivial lack of awareness, euphoria or anxiety, shortened attention span, impaired performance of addition or subtraction |
| Grade 2 | Lethargy or apathy, minimal disorientation for time or place, subtle personality change, inappropriate behaviour, asterixis |
| Grade 3 | Somnolence to semi-stupor, but responsive to verbal stimuli, confusion, gross disorientation |
| Grade 4 | Coma |