Sarnat score: clinical staging of posthypoxic encephalopathy
| Factor | Stage 1 | Stage 2 | Stage 3 |
|---|---|---|---|
| Consciousness | Alert | Lethargic | Coma |
| Tone | Normal | Hypotonic | Flaccid |
| Tendon reflexes | Increased | Increased | Depressed |
| Myoclonus | Yes | Yes | No |
| Suck | Active | Weak | Absent |
| Moro response | Increased | Incomplete | Absent |
| Grasp reflex | Normal | Increased | Absent |
| Oculocephalic | Normal | Increased | Depressed |
| Pupils | Dilated | Constricted | Variable/fixed |
| Respiration | Regular | Periodic/variable | Apnoea |
| Heart rate | Increased/normal | Bradycardia | Bradycardia |
| Seizures | No | Common | Uncommon |
| EEG | Normal | Periodic or paroxysmal | Periodic or isoelectric |