Notes on Evidence-based Interventions for Specific Phobia

Biological Interventions

  • GABA agonist (benzodiazepine)
    • Short-term relief; does not treat underlying cause.
    • Mechanism: binds to GABA receptor sites and increases GABA effectiveness, reducing neural firing.
    • Side effects: addiction, drowsiness, confusion, slurred speech.
    • Examples: Valium, Xanax
  • Beta blockers
    • Block adrenaline effects; slow CNS; used for situational anxiety (not phobia-specific).

Breathing Retraining

  • Normal breathing is 12-20 breaths per minute, diaphragmatic, nasal breathing.
  • Anxious breathing: shallow, hyperventilation; reduces CO2, which helps regulate stress response.
  • Controlled breathing: lowers blood pressure and heart rate; reduces stress hormones; promotes calmness.

Psychological Interventions

  • Cognitive Behavioural Therapy (CBT)
    • Cognitive component: identify irrational thoughts and replace with realistic thinking.
    • Behavioural component: modify unhelpful behaviours (e.g., avoidance).
  • Systematic Desensitisation
    • Based on classical conditioning; relaxation technique taught; gradual exposure to phobic stimuli with relaxation.
    • Reciprocal inhibition: relaxed state blocks anxious state.

Systematic Desensitisation – Steps

  1. Create a fear hierarchy.
  2. Start with least fear-inducing item; use relaxation to overcome fear.
  3. Progress up the ladder to more fear-provoking items.

Psychoeducation (Social) / Family Support

  • Challenging unrealistic or anxious thoughts; non-judgemental support helps recognise irrational thinking.
  • NOT encouraging avoidance behaviours; avoidance perpetuates phobia.
  • Family/supporters are taught how to provide effective support.

Causes / Perpetuation

  • Biological
  • Social
  • Psychological

Success Criteria (Self-check)

  • I can describe how a GABA agonist works.
  • I can teach someone else how breathing retraining works.
  • I can describe how CBT works.
  • I can explain how systematic desensitisation works.
  • I can describe the benefits of psychoeducation.