Posttraumatic Stress Disorder and the Concept of Complex Trauma

1. Overview & Epidemiology

PTSD sits in the ICD-10 block F43 — Reaction to severe stress, and adjustment disorders (the Debrecen lectures teach the F40–F48 "neurotic, stress-related and somatoform" group). The whole F43 family is defined by a causal external stressor — diagnosis is impossible without an identifiable trauma or life event, which separates it from the rest of psychiatry.

The F43 spectrum (by timeframe and stressor magnitude):

• Acute stress reaction (F43.0): transient, develops within minutes of an exceptional stressor, resolves within hours–days.
• Acute stress disorder (DSM-5-TR): 3 days–1 month post-trauma.
• Posttraumatic stress disorder (F43.1): delayed/protracted response to a catastrophic event; symptoms persist > 1 month.
• Adjustment (adaptation) disorders (F43.2): maladaptive reaction to an ordinary life stressor (divorce, job loss, illness, migration), not a catastrophe.

Stress — the conceptual frame (Selye, taught at UD):

• Stress disrupts the homeostatic balance of the organism.
• It encompasses both the aggressive impact (the stressor) and the response/suffering of the person (distress) — the response is part of stress, not separate from it (key for PSY - 4.157).
• General Adaptation Syndrome has three phases: alarm reaction → phase of resistance → phase of exhaustion.

Epidemiology:

• Lifetime trauma exposure: ~60–75% of the population experience ≥1 qualifying traumatic event; only a minority develop PTSD.
• Lifetime PTSD prevalence: ~7–8% (US/EU general population); 12-month prevalence ~3–4%.
• Sex: female : male ≈ 2 : 1, partly due to higher rates of interpersonal/sexual trauma.
• Conditional risk by trauma type: sexual assault/rape highest (~50%), combat and captivity high; accidents and disasters lower.
• High-risk groups in the European context: war refugees and asylum seekers (30–50%), survivors of torture, combat veterans, intimate-partner-violence survivors.

Vulnerability (risk) factors — high-yield for PSY - 4.162. Vulnerability to PTSD is increased by:

• Genetic factors (heritability of fear conditioning; twin data).
• Lack of social protection / poor social support (the single most consistent post-trauma predictor).
• Low intelligence / low education.
• Separation from parents in childhood, childhood adversity, prior trauma or psychiatric illness, female sex, peri-traumatic dissociation, and greater severity/proximity of the trauma.

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