Biological Underpinnings of PTSD

Speaker Background

  • Lina Velar
    • Graduate of the UAA Clinical Psychology Master’s program.
    • 24-year U.S. Army veteran.
    • Completed 5 combat deployments (Iraq, Kuwait, Afghanistan).
  • Presentation topic: Biological underpinnings of Post-Traumatic Stress Disorder (PTSD).

Framing Questions & Initial Thought Experiment

  • Reflective prompts posed to audience:
    • “Have you ever had a disturbing event you couldn’t forget, no matter how hard you tried?”
    • “What was your physiological reaction?”
    • Imagine that feeling becoming permanent and then intensified 100-fold → approximates lived PTSD experience.
  • Follow-up considerations:
    • Effects on school, work, and family relationships.
  • Illustrative metaphor: WWII veteran in campaign ad – “It happened 70 years ago and yesterday.”

Observations From Deployment

  • Noticed two groups of soldiers post-trauma:
    1. Seemed fine.
    2. Visibly disturbed, struggled upon returning home.
  • Maladaptive civilian behaviors in second group: heavy drinking, failing relationships, general misconduct.
  • Led speaker to investigate biological roots of combat-related PTSD.

Definition & Diagnostic History

  • PTSD = Exposure to events with capacity to provoke fear, horror, helplessness.
  • Diagnostic timeline:
    • DSM (Diagnostic and Statistical Manual of Mental Disorders) formally recognized PTSD in 1980.
    • ICD (International Classification of Diseases) added PTSD in 2007.
  • Fundamental cause: Failure of the stress-response system to react, adapt, and recover appropriately after trauma.

Combat Reinforcement of PTSD Symptoms

  • Why some soldiers feel “safer” in combat: War-zone adaptations can be maladaptive in civilian life but adaptive in theatre.
  • List of combat-reinforced symptoms & dual interpretations:
    • Distress of outsiders → Identifying potential threats in blended civilian-combatant environments.
    • Negative world expectations → In-theatre vigilance vs. pessimistic civilian worldview.
    • Anger & aggressive behavior → Eliminate threats in combat vs. unacceptable in grocery store.
    • Numbness → Emotional control during firefights vs. interpersonal disconnect at home.
    • Hypervigilance → Life-saving alertness vs. sleep disturbance.
    • Startle response → Ducking mortar fire vs. embarrassing reaction to car backfire.
    • Risk-taking → Accept convoy/IED dangers vs. post-deployment accidents, extreme sports.
    • Insomnia → Night watch duties vs. chronic sleep loss.
  • Statistic: More soldiers die in accidents after deployment than in combat.

Susceptibility & Risk Factors

  • Ongoing research; no definitive predictive test.
  • Event-related factors:
    • Severity
    • Duration
    • Proximity
    • Sense of helplessness.
  • Personal history factors:
    • Prior psychiatric disorders.
    • Turbulent family dynamics (physical abuse, parental alcohol abuse).
    • Foster-care upbringing.
  • Exposure ≠ inevitability:
    • 55-70\% of general population experiences at least one traumatic event.
    • Only about 2.2\% (≈ 7.7 million people) currently meet PTSD criteria.
  • Veterans:
    • 11-20\% of Iraq/Afghanistan veterans diagnosed (≈ 300,000 individuals).
    • Women twice as likely as men to develop PTSD.

Epidemiological & Suicide Data

  • Average of 22 veteran suicides per day → 1 every 65 minutes.
  • Veterans with concurrent PTSD and depression: 45\% higher likelihood of suicidal ideation & completion.

Pharmacological Treatment Overview

  • Psychopharmacological management categories:
    1. SSRIs (Selective Serotonin Reuptake Inhibitors) – first FDA-approved class.
    2. SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors).
    • Example: Venlafaxine → inhibits presynaptic reuptake of both serotonin & norepinephrine; documented symptomatic improvement.
    1. TCAs (Tricyclic Antidepressants).
    2. MAOIs (Monoamine Oxidase Inhibitors).
    • TCAs & MAOIs typically 2nd/3rd-line for anxiety/depression comorbidity.

Neurobiological Structures & Dysfunctions

  • Three primary brain areas implicated:
    1. Amygdala
    • Normal: Generates emotional reactions; triggers fight-or-flight.
    • PTSD: Fires in response to memories/thoughts, not actual danger → perpetual alarm.
    1. Hippocampus
    • Normal: Relay station for sorting & contextualizing memories.
    • PTSD: Stores memories out of context; high adrenaline during encoding leads to vivid, fragmented recollections & retrieval problems.
    1. Prefrontal Cortex (PFC)
    • Normal: Logic, reasoning, planning, impulse control.
    • PTSD: PFC “shuts down” → dysfunctional thought processes, poor decision making, inappropriate responses.
  • Additional system: Hypothalamus
    • Releases cortisol; orchestrates hormonal stress response.
    • PTSD: Overactive → hormone imbalance, elevated stress & anxiety.

Conceptualization

  • PTSD described as “a brain caught in a moment out of time.”
    • Continuous reliving of trauma; incapacitates forward movement.
    • Subjective metaphor: “Carrying the battleground inside.”

Rationale for Biological Study

  • Understanding neurobiology fosters:
    • Targeted, more effective treatments.
    • Prevention efforts (identify & intervene in high-risk individuals).
    • Reduction of veteran suicide rate.

Clinical & Therapeutic Implications

  • Therapist’s duty: Provide hope.
    • Explaining biological basis normalizes patient experience.
    • Validates dysregulated reactions → Relief & engagement in treatment.
  • Empirical progress suggests future innovations (pharmacological & psychotherapeutic) as neurobiology becomes clearer.

Key Takeaways

  • PTSD is not simply “mental weakness”; it is a measurable failure of specific brain circuits & hormone systems to recalibrate after trauma.
  • Combat environments reinforce behaviors that are maladaptive in civilian life, complicating reintegration.
  • While many people endure trauma, only a subset develop PTSD due to complex interplay of event severity, personal history, and biological predisposition.
  • Treatments currently rely heavily on SSRIs/SNRIs; deeper neurobiological insight may yield better modalities.
  • Suicide prevention remains urgent: 22 veteran lives lost daily underscores the stakes.