Psychiatry/Behavioral · PANCE / PANRE

Dissociative Disorders (DID, Dissociative Amnesia, Depersonalization/Derealization)

Disruptions of consciousness, identity, memory, or perception of self and surroundings, typically linked to trauma.

Also known as: DID, dissociative identity disorder, dissociative amnesia, depersonalization, derealization

Overview

DSM-5-TR dissociative disorders include: (1) Dissociative Identity Disorder (DID) — disruption of identity with ≥2 distinct personality states + recurrent gaps in recall of everyday events, personal information, or traumatic events; (2) Dissociative Amnesia — inability to recall important autobiographical information (usually trauma- or stress-related), beyond ordinary forgetting; with or without dissociative fugue specifier; (3) Depersonalization/Derealization Disorder — persistent or recurrent experiences of detachment from one's self (depersonalization) or surroundings (derealization) with INTACT reality testing.

Epidemiology

DID 12-month prevalence ~1.5%; female:male ~6:1 in clinical samples but ~equal in community surveys. Dissociative amnesia 12-month prevalence ~1.8%. Depersonalization/derealization disorder ~0.8-2% lifetime; onset usually adolescence/early adulthood. Transient depersonalization is much more common (~50% lifetime).

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Risk factors

Severe, chronic childhood trauma (sexual abuse, physical abuse, neglect) — strongest risk factor
Cumulative interpersonal trauma
Combat or torture exposure
Comorbid PTSD, borderline personality disorder, mood and anxiety disorders
Substance use, especially hallucinogens, cannabis (depersonalization)

Pathophysiology

Trauma-related disruption of integrative brain function — altered prefrontal-limbic regulation, hyperactive prefrontal inhibition of emotion (in depersonalization, an emotional 'shutdown'), and impaired hippocampal encoding/retrieval (in dissociative amnesia). DID is conceptualized as an extreme adaptation to inescapable trauma in early childhood.

Differential diagnosis

PTSD — Dissociative subtype with depersonalization/derealization is common; PTSD focuses on reexperiencing/avoidance/hyperarousal
Borderline personality disorder — Transient stress-related dissociation is part of BPD criteria; chronic identity disturbance differs from DID's distinct identity states
Psychotic disorders — Depersonalization preserves reality testing; psychosis does not
Seizure disorder (especially temporal lobe) — Stereotyped events with EEG correlates; postictal confusion
Substance-induced (cannabis, ketamine, hallucinogens, alcohol blackouts) — Temporal link to substance use
Medical: TIA, migraine aura, head injury, hypoglycemia — Focal neurologic features; targeted workup
Factitious or malingering — Especially in forensic contexts; look for external incentive

Diagnostic workup

Labs

TSH, CMP, glucose, B12
Toxicology screen
HIV, RPR if cognitive symptoms

Imaging

MRI brain if focal findings, late onset, or atypical course
EEG if suspicion of seizure

Diagnostic algorithm

Disorder	Core feature	Reality testing	Key treatment
Dissociative Identity Disorder	≥2 distinct personality states + memory gaps	Intact	Phase-oriented trauma psychotherapy
Dissociative Amnesia	Inability to recall autobiographical info (usually trauma-related)	Intact	Safety + supportive psychotherapy
Dissociative Fugue (specifier)	Sudden travel + amnesia for identity	Intact	Supportive care; usually resolves
Depersonalization/Derealization	Detachment from self or surroundings	Intact (key feature)	CBT, treat comorbid anxiety/depression
Psychotic disorder (contrast)	Hallucinations/delusions	Impaired	Antipsychotics

DSM-5-TR dissociative disorders — preserved reality testing distinguishes them from primary psychotic disorders.

Treatment

First-line

Phase-oriented trauma-focused psychotherapy: (1) stabilization and safety, (2) trauma processing, (3) integration and rehabilitation
Establish safety, manage suicidality and self-harm before trauma work
Trauma-focused CBT, EMDR (with caution in DID), and specialized DID therapies

Second-line / adjunct

SSRIs/SNRIs for comorbid depression, PTSD, anxiety
Prazosin for trauma-related nightmares
Avoid benzodiazepines (can worsen dissociation, addiction risk)
No FDA-approved medication for the core dissociative symptoms themselves
Lamotrigine has limited evidence for depersonalization disorder

Complications

Suicide and self-harm (especially DID — high lifetime rates)
Substance use disorders
Revictimization
Functional impairment, occupational loss
Comorbid mood, anxiety, eating, and personality disorders

PANCE pearls

DID is associated with severe early childhood trauma; question carefully and avoid suggestive techniques.
Depersonalization/derealization is the only dissociative disorder with intact reality testing — this distinguishes it from psychosis.
Dissociative fugue is now a specifier of dissociative amnesia (no longer a separate diagnosis).
First-rank Schneiderian symptoms (voices, passivity experiences) can occur in DID and are sometimes misdiagnosed as schizophrenia.
There is no FDA-approved medication for the core symptoms of any dissociative disorder; psychotherapy is the mainstay.

References

DSM-5-TR — American Psychiatric Association. DSM-5-TR. 2022.
ISSTD 2011 — International Society for the Study of Trauma and Dissociation. Guidelines for Treating Dissociative Identity Disorder in Adults, Third Revision. J Trauma Dissociation 2011;12:115-187.
Spiegel 2013 — Spiegel D et al. Dissociative disorders in DSM-5. Annu Rev Clin Psychol 2013;9:299-326.

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