Grading of hie
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Grading of Hypoxic-Ischemic Encephalopathy (HIE)
HIE in term neonates is clinically staged to guide prognosis and treatment. The most widely used system is the Sarnat & Sarnat (1976) staging, which divides HIE into three grades. Several other scoring systems are also in use.
Sarnat Staging System
| Feature | Stage 1 — Mild | Stage 2 — Moderate | Stage 3 — Severe |
|---|---|---|---|
| Level of consciousness | Hyperalert (↑) | Lethargic (↓) | Stupor/Coma (↓↓) |
| Spontaneous motor activity | Normal | Decreased (↓) | Absent/minimal (↓↓) |
| Tone | Mild distal flexion | Decreased (↓) | Flaccid (↓↓) |
| Muscle stretch reflexes | Hyperreflexia (↑) | Decreased (↓) | Absent (↓↓) |
| Suck reflex | Decreased (↓) | Decreased (↓) | Absent (↓↓) |
| Moro reflex | Exaggerated (↑) | Decreased (↓) | Absent (↓↓) |
| Autonomic system | Sympathetic predominance | Parasympathetic predominance | Both depressed |
| Seizures | None | Present | Present |
| EEG | Normal | Abnormal | Severely abnormal / burst suppression |
| Pupils | Dilated, reactive | Constricted | Variable; may be non-reactive |
| Duration | < 24 hours | Days–weeks | Hours–days |
| Prognosis | Usually complete recovery; low risk of handicap | Variable — may improve or worsen | High mortality; severe disability in survivors |
Clinical Description by Grade
Stage 1 (Mild):
- Hyperalertness with wide-open eyes; jittery/"jittery baby"
- Tremulousness of limbs and jaw; low threshold Moro reaction
- Normal limb tone; brisk reflexes; possible ankle clonus
- Anterior fontanel soft; EEG normal
- Symptoms maximal in first 24 h; recovery usually complete
Stage 2 (Moderate):
- Lethargy, obtundation, hypotonia; seizures developing by 24–48 h
- After 48–72 h, may improve or worsen (cerebral edema, hyponatremia, hyperammonemia from liver damage)
- EEG abnormal — epileptiform activity and voltage suppression predict poor outcome
- Abnormal visual/auditory evoked potentials = additional poor prognostic signs
Stage 3 (Severe):
- Stupor or coma from birth; irregular respirations requiring ventilation
- Convulsions typically within first 12 h
- Limbs hypotonic and motionless; sucking/swallowing absent
- Pupillary and eye movement responses initially may be retained, then lost as coma deepens
- High mortality; survivors face significant motor and cognitive disabilities
Other Grading Systems in Clinical Use
| System | Key Features |
|---|---|
| Thompson Encephalopathy Score | Numerical scoring (0–22) across tone, level of consciousness, seizures, posture, Moro, grasp, suck, respiration, fontanel; score ≥7 at day 3–4 predicts poor outcome |
| NICHD Neurological Exam | Used in major cooling trials |
| UCSF Encephalopathy Score | Institution-specific; similar clinical domains |
Relevance to Management
- Sarnat Stage 1 (mild): Traditionally not treated with therapeutic hypothermia (though evidence is evolving — recent studies show some mild HIE cases have adverse outcomes without cooling)
- Sarnat Stages 2–3 (moderate–severe): Therapeutic hypothermia (33.5°C for 72 h) initiated within 6 hours of birth is the standard of care and reduces death or disability by ~25% in moderate HIE
- MRI timing: Performed at day 3–4 (after hypothermia finishes) when DWI abnormalities are most apparent — confirms injury topography and adds prognostic information
Sources: Bradley and Daroff's Neurology in Clinical Practice, p. 2862; Adams and Victor's Principles of Neurology, 12th Ed.
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