Head Injury and Traumatic Brain Injury Overview

Head Injuries

Introduction to Head Injuries

• Definition: Head injuries refer to trauma that causes damage to the brain, which can range from mild (e.g., concussion) to severe (e.g., traumatic brain injury, skull fractures).

Causes of Head Injuries

• Common Causes:

  • Falls

  • Motor vehicle accidents

  • Sports injuries

  • Assault or blunt force trauma

Signs and Symptoms of Head Injuries

• General Signs/Symptoms:

  • Headache

  • Nausea and vomiting

  • Dizziness or confusion

  • Temporary loss of consciousness

• Severe Symptoms:

  • Prolonged loss of consciousness

  • Seizures

  • Bruising (e.g., raccoon eyes, Battle’s sign in cases of basilar skull fractures)

  • CSF leakage (rhinorrhea or otorrhea)

  • Unequal pupil sizes or sluggish response to light

Diagnostics for Head Injuries

Imaging Techniques

• CT Scan:

  • Considered the gold standard for identifying brain bleeds, swelling, or fractures.

• MRI:

  • Used for detailed imaging of soft tissues and brain structures.

• Neurological Exam:

  • Assesses level of consciousness using the Glasgow Coma Scale (GCS), motor function, and reflexes.

Traumatic Brain Injury (TBI)

Primary Brain Damage

• Definition: Occurs at the moment of impact, causing direct trauma to brain tissues.

• Types of Primary Brain Damage:

  • Contusions: Bruising on the brain due to blunt trauma, causing bleeding and swelling without tearing tissue.

  • Diffuse Axonal Injury (DAI): Shearing of nerve fibers from rapid acceleration and deceleration (e.g., in car accidents). Disrupts neuronal communication.

  • Fractures: Skull fractures may cause direct damage to brain tissue or lead to additional injuries.

  • Lacerations: Tearing of brain tissue, typically from penetrating injuries or skull fractures with bone fragments.

Skull Fractures Leading to TBI

Distinction Between TBI and Skull Fracture

• TBI: Affects the brain.

• Skull Fracture: Affects the skull bone.

Types of Skull Fractures

• Depressed Skull Fractures:

  • Characteristics: Part of the skull is sunken in, compressing brain tissue.

  • Increased infection risk if the skin is broken.

  • Caused by direct, high-energy impacts (e.g., blunt force).

  • Surgical intervention needed to elevate the skull fragment to prevent brain damage.

• Basilar Skull Fractures:

  • Location: Occurs at the base of the skull.

  • Symptoms: Raccoon eyes, Battle’s sign (bruising behind ears), rhinorrhea, and otorrhea (CSF leak).

  • High risk of infection and potential for meningitis, as bacteria can enter the brain from the fracture.

Measures of Consciousness

Glasgow Coma Scale (GCS) Scoring

• Normal: 15

• Mild: > 13

• Moderate: 9-12

• Severe: < 8

• Note: "Less than 8 intubate."

Example Scenarios Using GCS

Scenario 1: Normal Injury (GCS Score: 15)

• Details: 25-year-old male after minor car accident.

  • Eye Opening (E): Spontaneous opening (4)

  • Verbal Response (V): Clear responses, knows name, date, location (5)

  • Motor Response (M): Obeys commands (6)

Scenario 2: Moderate Injury (GCS Score: 12)

• Details: 40-year-old female fell from a ladder.

  • Eye Opening (E): Opens eyes in response to voice (3)

  • Verbal Response (V): Confused but responds with some coherent words (4)

  • Motor Response (M): Localizes pain by reaching (5)

Scenario 3: Severe Injury (GCS Score: 7)

• Details: 60-year-old male found unconscious after a fall.

  • Eye Opening (E): No response (1)

  • Verbal Response (V): Incomprehensible sounds (2)

  • Motor Response (M): Withdraws from pain (4)

Scenario 4: Very Severe Injury (GCS Score: 3)

• Details: 30-year-old male after motorcycle crash.

  • Eye Opening (E): No eye opening (1)

  • Verbal Response (V): No verbal response (1)

  • Motor Response (M): No motor response (1)

After a TBI: Secondary Brain Damage

Characteristics of Secondary Injuries

• Definition: Occurs post-initial injury and can exacerbate damage.

• Types of Secondary Injuries:

  • Swelling and Increased Intracranial Pressure (ICP):

  • Cerebral Edema: Swelling from fluid accumulation increases pressure within the skull.

  • Increased ICP: Skull is a fixed space; swelling compresses brain tissue, reduces blood flow, potentially leading to herniation.

  • Ischemia: Decreased blood flow that limits oxygen and nutrient delivery, causing further brain cell death.

Infections

• Potential for bacterial infections, such as meningitis or abscesses, particularly with open head injuries that allow bacterial entry.

Surgical Interventions for Head Injuries

Craniotomy

• Definition: A surgical procedure where a section of the skull is temporarily removed to access the brain.

• Indications:

  • Bleeding in the brain (subdural or epidural hematoma)

  • Brain tumors

  • Blood clots or stroke

  • Aneurysms

  • Severe swelling or high intracranial pressure

• Procedure Steps:

  1. Patient under general anesthesia.

  2. Surgeon incises the scalp and removes a section of the skull.

  3. Treatment of the brain issue takes place followed by replacement of the bone flap.

• Postoperative Monitoring: Monitoring for changes in neurological status (LOC, pupils, motor strength), signs of increased ICP, drainage output, bleeding, or infection.

Decompressive Craniectomy

• Definition: Procedure allowing the swollen brain to expand without compression from the skull, potentially saving the patient’s life.

• Storage Options: Bone flap can be stored in a freezer (cryopreservation) or in the patient’s abdomen.

Nursing Care Post-TBI

Measures for Managing ICP

• Head of Bed Positioning: Elevate to 30° to promote venous drainage and reduce ICP.

• Medication Management:

  • Administer prescribed medications, such as mannitol and hypertonic saline, to reduce ICP.

  • Recognize that mannitol and hypertonic saline target ICP, not blood pressure.

• Signs of Worsening ICP: Monitor for changes such as decreased GCS, abnormal posturing, or Cushing's triad (elevated BP, decreased heart rate, irregular breathing).

Monitoring Intracranial Pressure (ICP)

ICP Measurement

• Definition: Intracranial Pressure measures pressure within the skull.

• Normal Range: 5–15 mmHg; elevated ICP (>20 mmHg) is abnormal and dangerous due to risk of brain compression and herniation.

• Emergency Neuro Check:

  • Assess GCS, pupil size/reactivity, and motor response for abnormalities.

Clinical Signs of Elevated ICP

• Early Signs:

  • Headache (especially when lying flat or bending over)

  • Nausea and vomiting

  • Blurred/double vision

  • Restlessness or confusion

• Later Signs (Danger Zone):

  • Decreased LOC

  • Dilated non-reactive pupils

  • Abnormal posturing

  • Cushing’s Triad:

  • Increased BP (especially with widened pulse pressure)

  • Decreased heart rate (bradycardia)

  • Irregular breathing

Maintaining Stability Post-TBI

Oxygen Management

• Oxygen Application: Administer oxygen as needed using nasal cannula, non-rebreather, or intubation to maintain SpO₂ above 94%.

• Patient Positioning: Keep head of bed elevated at 30° to assist breathing and reduce pressure.

• Suctioning: Conduct sparingly to clear secretions and prevent oxygen drops, monitoring continuously with pulse oximetry.

Blood Pressure Management

• Target BP for TBI Patients:

  • Age 50-69: ≥ 100 mmHg

  • Age 15-49 or >70: ≥ 110 mmHg

• Fluid Administration: Use IV fluids to manage hypotension if necessary.

• Norepinephrine: Used as a vasopressor to maintain adequate blood flow.

Education for Patients and Families

• Importance of understanding nursing measures to reduce fear and anxiety.

• Educate on activities that could raise ICP and the significance of hydration and nutrition.

• Emphasize monitoring for signs of increasing ICP and managing medications effectively.

TBI Nursing Care Protocols

• Pain Management: Administer opiates for pain control to decrease chances of increased ICP.

• Environmental Control: Maintain a low-stimuli environment to support recovery.

• Monitoring: Continuous assessment for increased ICP signs or changes in consciousness.