Child Abuse and Neglect

1. THE 2-MINUTE PHYSIOLOGY (Rapid Pathophysiology)

• The Mechanical-Developmental Mismatch: The core pathophysiology of physical child abuse often involves the application of mechanical forces that vastly exceed the physiological capabilities or developmental stage of the child. For example, the infant thorax is highly compliant; therefore, sustaining rib fractures requires immense, non-physiologic anteroposterior compression, typically from severe squeezing.
• Abusive Head Trauma (AHT): Rotational and shearing forces from violent shaking cause bridging vein rupture and subdural hemorrhages, alongside diffuse axonal injury. This mechanical breakdown manifests clinically as altered mental status, lethargy, or intractable vomiting.
• Metabolic Derangement in Neglect: In cases of severe environmental neglect resulting in failure to thrive, the child enters a profound catabolic state. The reintroduction of nutrition can trigger "refeeding syndrome," a lethal intracellular shift of electrolytes (predominantly phosphorus, potassium, and magnesium) that can precipitate acute cardiac arrhythmias and respiratory failure.

2. THE BEDSIDE ACTION PLAN (Rapid ER Management)

• Immediate Resuscitation (ABCs): Medical evaluation and the treatment of life-threatening injuries always take absolute precedence over the forensic or legal investigation. Failure to oxygenate and ventilate is the most common cause of preventable death in pediatric trauma.
• Hemodynamic Stabilization: Tachycardia and poor skin perfusion are the best early indicators of hypovolemia in children; initiate rapid volume resuscitation with intravenous fluids if shock is present. For severe neglect and malnourishment, carefully manage fluids and electrolytes in an intensive care setting to mitigate the risk of refeeding syndrome.
• The Exposure Mandate: Completely expose the child from head to toe. A thorough skin examination is mandatory for all young children in the ED to screen for occult signs of trauma.
• Administrative & Legal Actions: Emergency clinicians are legally mandated reporters; you must immediately consult social work, Child Protective Services (CPS), and activate the Suspected Child Abuse and Neglect (SCAN) team. Consider hospital admission or transfer if a full workup cannot be completed or if a safe discharge is in question.

3. THE DIAGNOSTIC GRID (Differential Diagnosis & Workup)

• Critical "Can't-Miss" Mimics:
• Abnormal bleeding disorders (e.g., hemophilia, von Willebrand disease, leukemia) mimicking inflicted bruising.
• Accidental trauma (must strictly correlate with the child's developmental milestones).
• Inborn errors of metabolism or sudden infant death syndrome (SIDS) presenting as a Brief Resolved Unexplained Event (BRUE).
• Prioritized Diagnostic Workup:
• The Skeletal Survey: The gold-standard imaging modality for occult fractures. It is mandatory for all children <6 months with any bruising, children <24 months with concerning bruising, and generally any child <2 to 3 years old with suspected inflicted injuries.
• Head Computed Tomography (CT): Maintain a very low threshold to obtain a non-contrast Head CT in children with any face/head injuries, or those exhibiting subtle neurologic signs such as fussiness, lethargy, vomiting, or poor feeding.
• Documentation: Record full vital signs, growth parameters, and meticulously document all historical findings in the medical record using direct quotes from the caregivers.

4. THE VISUAL BOARD (ECG / POCUS / Imaging)

• Sentinel Skin Injuries: Visually inspect for "sentinel injuries" in infants <12 months, which include subconjunctival hemorrhages, frenulum tears, burns, bites, and unusual bruising.
• Patterned Bruising: Look specifically for patterned loop bruising on the trunk or buttocks (indicating impact with a cord or belt), bruising/petechiae on the ear, or contusions on the inner aspect of the upper arm (indicating the child was grabbed or held tightly).
• Imaging Pearls:
• Rib Fractures: A standard chest x-ray is highly insensitive for detecting pediatric rib fractures, which are extremely uncommon in young children unless caused by inflicted trauma.
• Skull Fractures: Utilizing 3D CT reconstruction significantly increases the diagnostic sensitivity and specificity for detecting infant skull fractures.

5. THE SCORING MATRIX (Risk Stratification & Guidelines)

• The PECARN TBI Exclusion: The PECARN Traumatic Brain Injury rules do not apply to patients with suspected abusive head trauma. You cannot use PECARN to clinically clear a child if abuse is suspected.
• High-Risk Profiles: Children <4 years old, particularly infants <12 months, and those with special needs or mental illness are at the highest risk for abuse.
• The "Red Flag" History Checklist: Abuse must be heavily suspected if the history includes:
• No history of trauma for a significant injury.
• Implausible history or details that change with repeated questioning.
• A reported mechanism that is entirely inconsistent with the injury or the child's developmental stage.
• Discrepancies in the story provided by different caregivers.
• A significant, unexplained delay in seeking medical care.

6. THE DANGER ZONE (Pitfalls & Critical Actions)

• The PECARN Pitfall: Pitfall: Using PECARN low-risk criteria to discharge an infant with head trauma when the history is inconsistent. Critical Action: Recognize that PECARN rules are invalid in abusive head trauma; maintain a low threshold for head CT.
• The Ophthalmologic Screen Trap: Pitfall: Relying on a bedside ophthalmologic examination to screen for abusive head trauma. Critical Action: Board examiners test the fact that a standard ophthalmologic exam is a poor screening method for head injury; definitive imaging is required.
• The "Minor" Injury Blindspot: Pitfall: Overlooking sentinel injuries (like a torn frenulum or subconjunctival hemorrhage in an infant) as inconsequential. Critical Action: Treat these as highly sensitive red flags that demand a full skeletal survey and CPS involvement.
• The Chest X-Ray False Reassurance: Pitfall: Ordering a single AP chest x-ray to rule out rib fractures. Critical Action: Understand that CXR is insensitive for rib fractures; a dedicated skeletal survey must be ordered.

7. MCQ MASTERCLASS (Written Exam Tips)

• Buzzwords: "Contusions on the inner aspect of the upper arm" (indicates grabbing/shaking); "Frenulum tear in a 4-month-old" (classic sentinel injury); "Patterned loop bruising" (inflicted injury with an object).
• Concept: Exam questions frequently describe an infant presenting with lethargy and vomiting with no history of trauma. The correct next step is always a Head CT to evaluate for abusive head trauma, not reassurance or a gastroenteritis workup.
• Distractor: A common distractor is offering "Delay medical treatment until law enforcement arrives." Differentiate: Medical evaluation and resuscitation always take absolute precedence over forensic investigations.

8. THE BOARDROOM SCRIPT (OSCE & Oral Board Tips)

• Communication: "I will use objective, nonaccusatory, and matter-of-fact statements when communicating with the caregivers to avoid escalating the situation while I gather information.".
• The Physical Exam: "I am completely undressing the child to perform a comprehensive head-to-toe skin examination, specifically looking for sentinel injuries such as frenulum tears, subconjunctival hemorrhages, and patterned bruising.".
• Executing the Workup & Disposition: "Given the discrepancy between the reported mechanism and the child's developmental stage, I am highly concerned for non-accidental trauma. Medical stabilization is my first priority. I will order a full skeletal survey and a non-contrast head CT with 3D reconstructions. I am documenting the history using direct quotes, consulting social work, and fulfilling my legal mandate to report this to Child Protective Services.".