Question 1

A 29-year-old woman with a documented history of severe childhood sexual abuse presents to the PMHNP after being referred by her therapist. The therapist reports observing dramatic shifts in the patient's demeanor, voice, and expressed preferences during sessions. The patient uses different names at different times and has no memory of some sessions. She reports finding clothes in her closet she does not remember buying and receiving texts on her phone from conversations she cannot recall. She has extensive gaps in her childhood memories. Neurological workup is unremarkable. Which of the following best characterizes this presentation?

Accepted Answer

This presentation meets full DSM-5 criteria for DID: 2+ distinct personality states with marked discontinuity in sense of self and agency, recurrent gaps in recall of everyday events, clinically significant impairment, and not attributable to substances or medical conditions. While BPD involves identity disturbance, the identity disturbance in BPD is diffuse instability of self-image — not discrete personality states with their own names and separate memory access. PTSD with dissociative features involves depersonalization/derealization but maintains a single continuous identity. The documented abuse history, long-standing pattern, and observations from an established therapist argue against malingering. Controversy surrounding DID does not mean the diagnosis should be dismissed when criteria are clearly met.

Question 2

A 22-year-old college student presents to the PMHNP with an 8-month history of feeling "like I'm watching my life from behind a glass wall." He says his hands don't look like they belong to him, conversations sound muffled and distant, and the world looks "flat and artificial, like a stage set." These symptoms are continuous and severely distressing. He is terrified he is "losing his mind" and has gone to the emergency department twice fearing a brain tumor. All medical workups, including MRI and EEG, have been normal. He says, "I know the world is real — I can tell you it's real — but it doesn't FEEL real, and I can't make the feeling stop." What is the most likely diagnosis, and what is the key feature that distinguishes it from psychosis?

Accepted Answer

This is a textbook presentation of DPDR. The critical distinguishing feature is intact reality testing — the patient knows his experience is abnormal and that reality is not actually altered. This is the single highest-yield distinction for DPDR on board exams. Psychosis involves impaired reality testing where the patient believes their distorted perception is real. His fear of 'going crazy' is actually diagnostically reassuring — it indicates preserved insight. While anxiety can cause transient depersonalization, 8 months of persistent, continuous DPDR symptoms causing severe distress and functional impairment warrant the DPDR diagnosis, not attribution to anxiety alone.

Question 3

A 40-year-old combat veteran is referred for evaluation after claiming he has no memory of a 2-year deployment during which a fellow soldier was killed. He recalls events before and after the deployment clearly. He can learn new information without difficulty, his general cognitive functioning is intact, and neurological examination and MRI are normal. He is not involved in any legal proceedings and is not seeking disability. He reports nightmares about combat that he "can't quite make out" and becomes visibly distressed when asked about the deployment, saying "I just can't remember — it's like that time doesn't exist." His wife confirms the deployment occurred and that he was close to the soldier who died. What is the most likely diagnosis, and what features distinguish this from organic amnesia?

Accepted Answer

This presentation meets DSM-5 criteria for dissociative amnesia: inability to recall important autobiographical information (the entire deployment) that is inconsistent with ordinary forgetting, with clinically significant distress and no attributable medical condition. The key features distinguishing this from organic amnesia are: intact anterograde memory (new learning preserved), intact procedural memory, normal neurological exam, normal neuroimaging, and amnesia boundaries corresponding to emotional significance rather than neuroanatomical patterns. Malingering is less likely given no identified external incentive (no legal proceedings, not seeking disability). While PTSD and dissociative amnesia can co-occur, the extensive amnesia spanning 2 years of autobiographical memory goes beyond typical PTSD avoidance and warrants the dissociative amnesia diagnosis.

Dissociative Disorders

Red Flags & Key Clinical Considerations

Misdiagnosing DPDR as Psychosis

Benzodiazepines Can Worsen Dissociation

Dissociative Disorders Are Frequently Misdiagnosed

Trauma Processing Before Stabilization Can Cause Harm

Self-Harm During Dissociative States

Dissociative Fugue Is a Medical Emergency Until Proven Otherwise

Related Medications

References & Further Reading