Shaken Baby Syndrome

Intro & Risks - Tiny Victim Trauma

• SBS/AHT: Severe physical child abuse; violent shaking of infant/young child.
• Age: Infants < 1 year (peak 2-4 months).
• Anatomical Vulnerability:
  • Large head, weak neck muscles.
  • Immature brain: ↑ water, ↓ myelin; fragile bridging veins.
• Key Trigger: Inconsolable crying. 📌 PURPLE Crying (Peak, Unpredictable, Resistant, Pain-face, Long, Evening).
• Perpetrator Risks:
  • Young/inexperienced caregivers, stress (financial, social, mental health).
  • Substance abuse, personal abuse history/exposure to violence.
• Child Risks:
  • Colic, prematurity, disabilities, multiple births.

⭐ Inconsolable crying is the most common reported trigger for shaking.

How It Harms - Brain's Violent Shake

• Mechanism: Violent shaking → Repetitive acceleration-deceleration & rotational forces.
  • Infant vulnerabilities: Large head, weak neck, soft brain (↑water, poor myelination), larger subdural space.
• Primary Brain Injuries:
  • Subdural Hemorrhage (SDH): Tearing of bridging veins. Most common.
  • Diffuse Axonal Injury (DAI): Axonal shearing from differential brain movement.
  • Cerebral Edema: Cytotoxic and/or vasogenic.
• Key Associated Injury:
  • Retinal Hemorrhages (RH): Often bilateral, numerous, multilayered, extending to ora serrata.

    ⭐ Extensive, bilateral, multilayered retinal hemorrhages are highly specific for Abusive Head Trauma (AHT).

• Secondary Brain Damage:
  • Hypoxic-ischemic injury (due to apnea, seizures, ↑ICP).
  • ↑ Intracranial Pressure (ICP) → Cerebral herniation.

Clinical Clues - Silent Screams Seen

• General Presentation: Often non-specific. Irritability, lethargy, poor feeding, vomiting, bulging fontanelle, apnea.
• Neurological Red Flags:
  • Seizures (focal/generalized).
  • Altered sensorium (drowsiness to coma).
  • Bradycardia.
• Ocular Findings:
  • Retinal hemorrhages (RH): Bilateral, extensive, multilayered, extending to ora serrata. "Too numerous to count".
• Intracranial Injuries:
  • Subdural hematoma (SDH): Acute/chronic; interhemispheric fissure, over convexities.
  • Cerebral edema, hypoxic-ischemic injury.
• Skeletal Injuries (Often Hidden):
  • Metaphyseal fractures (e.g., corner, bucket-handle).
  • Posterior rib fractures: Highly specific.
  • Multiple fractures, different healing stages.
• External Signs: May be minimal/absent. Bruises (face, chest, arms), scalp swelling.

⭐ Bilateral, extensive, multilayered retinal hemorrhages are a cardinal sign of abusive head trauma (AHT) in infants.

Dx, Rx & Law - Diagnose & Defend

• Clinical Suspicion: Inconsistent history, apnea, seizures, lethargy, irritability.
• Diagnostic Triad (⚠️ Not always present/specific): Subdural hematoma (SDH), retinal hemorrhages (RH), encephalopathy.
• Other Signs: Posterior rib fractures, metaphyseal fractures.

• Medico-Legal Imperatives:
  • Mandatory reporting to Child Protective Services (CPS)/Child Welfare Committee (CWC) & Police.
  • Meticulous documentation is crucial for legal proceedings.
  • Primary goal: Ensure child's immediate and future safety.

⭐ Extensive, bilateral, multi-layered retinal hemorrhages, often extending to the ora serrata, are a hallmark finding highly suggestive of abusive head trauma.

High‑Yield Points - ⚡ Biggest Takeaways

• Shaken Baby Syndrome (SBS) or Abusive Head Trauma (AHT): due to violent shaking causing acceleration-deceleration injury.
• Classic triad: Subdural hemorrhage (SDH), retinal hemorrhages, and encephalopathy.
• Bilateral, multilayered retinal hemorrhages extending to ora serrata are highly specific.
• Associated injuries: Posterior rib fractures, metaphyseal (corner/bucket-handle) fractures.
• Non-specific presentation: irritability, lethargy, seizures, apnea; often no external signs of trauma.
• Neuroimaging (CT/MRI) and skeletal survey are key investigations.
• High risk of long-term neurological deficits or death; suspect if history is inconsistent with injuries.