Head Trauma

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Head Trauma: Basics - Skull Cracker Intro

  • Epidemiology: Road Traffic Accidents (RTAs) are a major cause of head trauma.
  • Injury Types:
    • Primary: Direct, irreversible damage at impact.
    • Secondary: Delayed, potentially preventable (e.g., hypoxia, edema, ↑ICP).
  • Monro-Kellie Doctrine: Skull is a rigid box. Intracranial volume ($V_{brain} + V_{blood} + V_{CSF}$) is constant. If one component volume ↑, others must ↓ to maintain normal Intracranial Pressure (ICP). Monro-Kellie doctrine and intracranial pressure

⭐ Falls are the most common cause of Traumatic Brain Injury (TBI), particularly in pediatric and geriatric populations.

Head Trauma: GCS & Severity - Brain Scoreboard

  • GCS: E+V+M. Total 3-15.
  • GCS Scoring:
    Comp.MaxResponses
    E (Eye)4Spont (4), Speech (3), Pain (2), None (1)
    V (Verb)5Orient (5), Conf (4), Inapp (3), Sounds (2), None (1)
    M (Mot)6Obeys (6), Local (5), Withdraw (4), Flex (Decorticate) (3), Ext (Decerebrate) (2), None (1)
  • TBI Severity: Mild 13-15; Mod 9-12; Sev 3-8 (GCS ≤8 intubate).

⭐ GCS drop ≥2 pts: urgent reassessment.

Head Trauma: Fractures & Hematomas - Crack & Bleed Atlas

  • Fractures:
    • Linear: Simple break.
    • Depressed: Bone fragment pushed inwards.
    • Basilar: Skull base. Signs: Battle's (postauricular ecchymosis), Raccoon eyes (periorbital ecchymosis), CSF otorrhea/rhinorrhea. Types of intracranial hemorrhage
  • Hematomas:
    TypeSourceCT AppearanceKey Feature(s)
    EDHMMA (Middle Meningeal A.)Lentiform 📌 LemonLucid interval
    SDHBridging veinsCrescentic 📌 BananaGradual; elderly/alcoholics
    SAHAneurysm/TraumaBlood in cisternsThunderclap headache
    • ICH (Intracerebral): Bleeding within brain parenchyma.

⭐ The Middle Meningeal Artery (MMA) is the most common source of Extradural Hematoma (EDH).

Head Trauma: ICP & CPP - Pressure Cooker Control

  • Normal Intracranial Pressure (ICP): 5-15 mmHg.
  • Cerebral Perfusion Pressure (CPP) is $CPP = MAP - ICP$. Maintain CPP >60 mmHg.
  • Signs of raised ICP (↑ICP):
    • Cushing's Triad: Systemic Hypertension, Bradycardia, Irregular respirations.

⭐ Cushing's Triad (systemic hypertension, bradycardia, irregular respirations) is a late, ominous sign of severely raised ICP.

  • Management of raised ICP:
    • Elevate head of bed to 30° (promotes venous outflow).
    • Hyperosmolar therapy: Mannitol (0.5-1 g/kg IV), Hypertonic Saline.
    • Controlled hyperventilation (Target PaCO₂ 30-35 mmHg; temporary).
    • Surgical decompression (craniectomy) for refractory cases.

Monro-Kellie doctrine and ICP curve

Head Trauma: Imaging & Interventions - Scan & Fix Guide

  • CT Head Indications:
    Rule ComponentFinding
    Key Adult SignsGCS <15, Focal deficit, Fracture signs
    Key Pediatric SignsPECARN: AMS, LOC, Fracture signs

    ⭐ NCCT Head: Initial imaging of choice in acute head trauma.

  • MRI: For DAI, subacute/chronic bleeds, posterior fossa.
  • Surgical Fix Criteria:
    • EDH: >30ml vol, >15mm thick, midline shift >5mm.
    • Acute SDH: >10mm thick, midline shift >5mm.
    • Depressed Fx: >cranial thickness, dural tear.
  • Interventions: Craniotomy (flap replaced), Craniectomy (flap out). CT scan: SDH with midline shift

Head Trauma: Complications - Aftermath Alert

  • Early:
    • Seizures (prophylaxis: 7 days for severe TBI)
    • Hydrocephalus
    • Infection (meningitis)
    • Cerebral Salt Wasting (CSW)
  • Late:
    • Post-Concussion Syndrome (PCS)
    • Post-Traumatic Epilepsy (PTE)
    • Cognitive deficits
    • Chronic Traumatic Encephalopathy (CTE)

⭐ Post-concussion syndrome is a common long-term sequela, even after mild TBI.

High‑Yield Points - ⚡ Biggest Takeaways

  • GCS (Glasgow Coma Scale) is key for initial assessment and predicting outcome in head trauma.
  • EDH (Extradural Hematoma) often shows a lucid interval; typically a middle meningeal artery bleed.
  • CT scan is the undisputed investigation of choice for any acute head injury.
  • Cushing's triad (↑BP, ↓HR, irregular breathing) indicates critically raised ICP (Intracranial Pressure).
  • Diffuse Axonal Injury (DAI) can present with minimal CT findings but carries a grave prognosis.
  • Management priorities: ABCDE protocol, and crucially, prevent secondary brain injury.
  • Basilar skull fracture indicators include Battle's sign (postauricular ecchymosis) and Raccoon eyes (periorbital ecchymosis).
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extended FAST incorporates _____ and right thoracic views to assess for pneumothorax and haemothorax.

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extended FAST incorporates _____ and right thoracic views to assess for pneumothorax and haemothorax.

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