mar 17 brain injuries & illness pt 1

Course Overview

  • The course is entering the last third, with three to four weeks remaining.

    • Focus shifts to observable brain damage and brain injuries.

Brain Injuries

  • Discussion centered around brain injuries (TBIs) and their implications.

  • Types of neurodegenerative diseases that arise from brain injuries include:

    • Alzheimer's Disease

    • Parkinson's Disease

    • Epilepsy

Traumatic Brain Injuries (TBIs)

  • Main focus on traumatic brain injuries, including:

    • Mild TBIs (previously known as concussions).

    • Chronic Traumatic Encephalopathy (CTE), resulting from repeated mild TBIs.

  • CTE's characteristics include:

    • Progressive and irreversible neurodegenerative condition.

    • Associated with symptoms like seizures (epilepsy) following TBIs.

Guest Speakers

  • Two guest speakers are survivors of severe TBIs:

    1. George (GG)

    • Severe frontal lobe injury.

    • Open about his condition; has spoken for years in the class.

    • Recovery aided by public speaking and preparation for talks.

    • Dealing with memory issues and inhibition problems.

    • Observed changes in his ability to deliver talks over the years.

    1. Unnamed Star Athlete

    • Suffered a severe TBI and was legally dead for five minutes.

    • His brain was severely swollen, requiring urgent medical intervention.

    • Different recovery path compared to George.

    • Discussions on the injury's nature and its implications.

Ethical Considerations

  • It’s warned that questions about the nature of the trauma or specifics about the injury should be handled delicately due to emotional implications.

  • Both speakers have encountered legal proceedings related to their injuries, impacting what they can disclose.

Future Topics

Epilepsy

  • Following the guest talks, the next topic is epilepsy as a sequela from TBIs:

    • Defined as recurring seizures.

  • A guest speaker and director of the BC Epilepsy Society will provide insights.

    • This speaker also lives with epilepsy and has experience with seizures during talks.

Course Logistics

  • Notebooks will provide readings, including one on the experiences of mild TBI.

  • Reminder: Midterm exam updates on progress, with exams scheduled but possibly accommodating students with specific needs.

Traumatic Brain Injury (TBI) Statistics

  • Statistics on TBIs in Canada (2010):

    • Approaching 200,000 cases.

    • Around 40,000 severe TBIs in one year, with significant personal costs.

  • TBI symptoms vary based on the injury's nature and affected brain areas.

    • Common symptoms include:

      • Chronic fatigue and recurring headaches.

      • Dizziness and sleep disruptions.

      • Tremors (not widely documented).

      • Sensitivity to light.

Types of TBIs

  • Closed vs. Open Head TBIs:

    • Closed head TBIs—more focus

    • Open head TBIs—less common but involve skull penetration (e.g., gunshot wounds).

Mechanism of TBIs

  • Brain dynamics likened to a fish in a tank; the brain collides against the skull during an impact.

  • Coup vs. Contrecoup Injuries:

    • Coup: Damage at the site of impact.

    • Contrecoup: Damage opposite the impact site.

  • Injured brain shows contusions or bruises when blood vessels rupture; pooling of blood can occur, necessitating medical intervention.

Diagnosis & Classification of TBIs

  • Mild TBI: Defined by:

    • No observable brain damage on MRIs.

    • Loss of consciousness lasting less than 30 minutes.

    • Altered consciousness and post-traumatic amnesia of less than one day.

  • Differentiation in terminology is suggested to avoid trivializing the effects of brain injuries.

Chronic Traumatic Encephalopathy (CTE)

  • CTE can arise from repeated mild TBIs, characterized by:

    • Progressive dementia symptoms (memory loss, Parkinsonism, mood disturbances).

    • Pathological markers: Neurofibrillary tangles (tau protein abnormalities).

  • Affected populations include athletes and non-athletes (e.g., construction workers, spousal abuse victims).

Brain Tumors

Types of Brain Tumors

  • Meningiomas: Benign tumors, easily removable and encapsulated.

  • Infiltrating Tumors: More dangerous, difficult to remove, often malignant (e.g., glioblastomas).

  • Metastatic Tumors: Originating from primary tumors elsewhere in the body.

Glioblastoma Details

  • Most common malignant brain tumor in adults.

  • Tumors grow through glial networks, highlighting the challenge of treatment.

Stroke Overview

  • Sudden onset cerebrovascular disorders leading to brain damage either from blood leakage (hemorrhagic) or restricted blood flow (ischemic).

  • Infarct vs. Penumbra: Core damage cannot be recovered, while surrounding areas (penumbra) may be salvaged.

  • Symptoms include FACE (drooping), ARM weakness, and speech difficulties—these can have different presentations in males vs. females.

Aneurysms and Hemorrhagic Stroke

  • Aneurysms are bulging blood vessels that can lead to strokes when they rupture.

    • Surgical options include clipping and coiling for treatment without extensive skull opening.

Clinical Implications and Challenges

  • There's a need for increased awareness of brain injuries and subsequent conditions.

  • Legal implications and emotional burdens in discussing specific trauma histories should be approached with sensitivity.

  • The conversation around neurodegeneration following TBIs emphasizes the importance of careful monitoring post-injury, especially in the first 24-48 hours.