ICD-116B41	COMPLEX POST TRAUMATIC STRESS DISORDER (cPTSD) Complex post traumatic stress disorder
ICD-10F43.1	Post-traumatic stress disorder
DSM-5-TRF43.10	Posttraumatic Stress Disorder (no separate DSM-5-TR category)

1. Definition and nosology

Complex PTSD (ICD-11: 6B41 Complex Post-Traumatic Stress Disorder) — a disorder that develops in response to prolonged or repeated trauma from which escape is difficult or impossible (prolonged abuse, childhood physical or sexual violence, war, torture, human trafficking). It includes the three symptom domains of PTSD (re-experiencing, avoidance, persistent sense of threat). To these is added “disturbance of self-organization” (DSO): affect regulation impairment, negative self-esteem, difficulty in relationships.

In ICD-11, added for the first time as an official diagnostic category; DSM-5-TR does not have a separate cPTSD category (the PTSD dissociative subtype qualifier covers some features).

2. History

• Herman J.L. (1992) — “Complex PTSD” concept (book “Trauma and Recovery”); “Disorder of Extreme Stress Not Otherwise Specified” (DESNOS) — not included in DSM-IV.
• ICD-11 (2019) — official code 6B41; based on evidence separating it from PTSD (based on reviews by Cloitre M. et al.).

3. Epidemiology

• Prevalence: 1–8% among trauma-exposed patients in primary care (summary by Brewin C.R. et al.).
• Particularly high in patients with a history of childhood abuse.
• Comorbidity: MDD, GAD, dissociative disorders, BPD (clinical overlap), substance use, eating disorders.

4. Aetiology and pathogenesis

• Trauma type — prolonged, repeated, perpetrated by others (interpersonal), difficult escape.
• Trauma occurring in childhood — broad impact on personality development.
• Neurobiological — similar to PTSD but with more widespread HPA dysregulation, dissociation, and impaired affect regulation.

5. Clinical features

PTSD consists of three primary domains.

• Re-experiencing (intrusives).
• Avoidance.
• Persistent sense of threat.

Self-Organization Disturbance (DSO) — core adjunct of cPTSD

• Affect Dysregulation — emotional variability, intense reactions, emotional flattening.
• Negative self-esteem — persistent feelings of shame, guilt, worthlessness.
• Difficulty in relationships — avoidance of close relationships, persistently impaired attachment.

6. Diagnosis

6.1 Unified diagnostic criteria (ICD-11)

A. Exposure to long-term or repeated trauma.

B. PTSD has three main domains.

C. Self-Organization Disturbance (DSO) three domains:

1. Affect Dysregulation;
2. Negative self-esteem;
3. Difficulty in relationships.

D. Significant functional impairment.

6.2 Source-specific clarifications

• ICD-11 — Separate category; DSO requires additional criteria.
• DSM-5-TR — cPTSD separately not; PTSD ‘with dissociative features’ qualifier covers some characteristics.
• ISTSS 2019 Complex PTSD Guidelines — recommends phased approach.

6.3 Diagnostic algorithm

1. Clinical interview + trauma history (long-term, repetitive).
2. ITQ (International Trauma Questionnaire — Cloitre M.) — designed for differentiating PTSD and cPTSD.
3. Comorbidity (especially BPD, dissociative disorders).
4. Assessment of suicide and self-harm risk.

6.4 Differential diagnosis

7. Examination and assessment

• ITQ (International Trauma Questionnaire) — gold standard.
• PCL-5 + DSO additional scales.
• BPD screening (McLean Screening Instrument for BPD).
• Suicide and self-harm (C-SSRS).

8. Treatment

8.1 General principles (ISTSS 2019)

1. Phase-based approach:
   • Phase 1 — stabilization — Safety, emotional regulation skills, coping strategies, psychoeducation.
   • Phase 2 — processing of traumatic memories — Evidence-based methods for PTSD (PE, CPT, EMDR), but longer duration and more persistent.
   • Phase 3 — reintegration — Restoration of relationships, improvement of quality of life.
2. Skills Training in Affective and Interpersonal Regulation (STAIR — Cloitre M.) + or pre-trauma phase 1 intervention.
3. Trauma-focused CBT and EMDR — adapted format.
4. DBT-PTSD (Bohus M.) — in comorbid BPD cases.
5. SSRI adjunct — comorbid depression and anxiety.
6. Duration of treatment is long (1–2 years or more).
7. Clinician continuity and therapeutic alliance are critically important.

8.2 Source-specific clarifications

• ISTSS 2019 Complex PTSD Guidelines — phased approach.
• Cloitre M. et al. reviews — STAIR + Narrative Exposure Therapy effective.
• Bohus M. DBT-PTSD — RCT evidence base is developing.

Treatment methods

1. Skills Training in Affective and Interpersonal Regulation (STAIR) — Cloitre M. — Phase 1 — emotional regulation and interpersonal skill development; then processing traumatic memories via Narrative Story Telling (NST). 16–24 sessions.
2. Dialectical Behavior Therapy — PTSD (DBT-PTSD) — Bohus (Bohus M.), Linehan (Linehan M.) — DBT principles + trauma-focused components; especially in comorbid BPD cases.
3. Narrative Exposure Therapy (NET) — Schauer M., Neuner F., Elbert T — The patient narrates life history in sequence, traumatic episodes are processed; effectiveness in refugees and torture victims.
4. EMDR, CPT, PE — adapted — Within a longer, phased approach.
5. International Trauma Questionnaire (ITQ) — Cloitre M. — Specific validated tool for distinguishing PTSD and cPTSD.

9. Prognosis

• Chronic course; but significant improvement with phased approach.
• Comorbid BPD, dissociative disorders, substance use poor prognosis.

10. Myths and misconceptions

Myth 1: “Complex PTSD is just a new name for borderline personality disorder”

Evidence: Clinical overlap significant, but ICD-11 PTSD is trauma-based; BPD a separate personality disorder. ITQ and BPD scales differentiate; most cPTSD patients do not meet BPD criteria.

Myth 2: “After the trauma is ‘resolved,’ the patient normalizes”

Evidence: Long-term trauma affects personality development; ‘closure’ is insufficient; phased approach and long-term treatment are required.

Myth 3: “Standard PTSD treatment (PE, CPT) is equally effective for cPTSD”

Evidence: ISTSS 2019 — phased approach in cPTSD; the patient must first be stabilised before trauma processing (phase 1); direct exposure may pose a risk of re-traumatization.

Myth 4: “Only an antidepressant is sufficient for complex PTSD”

Evidence: Psychotherapy is first-line; pharmacotherapy in adjunct role.

Myth 5: “The patient must be made to talk about the trauma immediately”

Evidence: Trauma processing without Phase 1 stabilization can be harmful; trauma-informed care principles.

11. Sources

1. WHO. ICD-11. 6B41 Complex post traumatic stress disorder. 2024.
2. Cloitre M., Garvert D.W., Brewin C.R. et al. Evidence for proposed ICD-11 PTSD and complex PTSD: a latent profile analysis. Eur J Psychotraumatol 2013;4:20706.
3. ISTSS Complex PTSD Treatment Guidelines. International Society for Traumatic Stress Studies; 2019.
4. Herman J.L. Trauma and Recovery. Basic Books; 1992.
5. Cloitre M., Koenen K.C., Cohen L.R., Han H. Skills training in affective and interpersonal regulation followed by exposure: a phase-based treatment for PTSD related to childhood abuse. J Consult Clin Psychol 2002;70(5):1067–1074.
6. Bohus M. et al. DBT-PTSD for posttraumatic stress disorder after childhood abuse: RCT. JAMA Psychiatry 2020;77(12):1235–1245.
7. Schauer M., Neuner F., Elbert T. Narrative Exposure Therapy: A Short-Term Treatment for Traumatic Stress Disorders. 2nd ed. Göttingen: Hogrefe, 2011.
8. Linehan M.M. DBT Skills Training Manual. 2nd ed. New York: Guilford Press, 2015.