The modern classification (lead with this)
ICD‑11 is dimensional: classify by severity (mild / moderate / severe) + prominent trait domains (negative affectivity, detachment, dissociality, disinhibition, anankastia) + an optional borderline pattern qualifier. The DSM‑5 A/B/C clusters remain useful shorthand and for exams, but severity + traits is the current frame — and severity predicts outcome and need better than category.
State vs trait — the pivotal clinical discrimination
- State = episodic change from baseline (mood/psychotic episode).
- Trait = pervasive, enduring (from adolescence/early adulthood), cross‑situational pattern.
This separates borderline PD from bipolar disorder (they also co‑occur), and prevents diagnosing a PD during an acute episode. Corroborate with longitudinal + collateral history.
Borderline pattern — the highest‑stakes
Emotion dysregulation, unstable relationships/identity, impulsivity, recurrent self‑harm/suicidality, splitting. Active risk management + structured psychotherapy is primary — DBT (also MBT, schema therapy). Medication is adjunctive (target comorbidity/crises), not a treatment for the personality structure itself. Avoid polypharmacy.
Pitfalls
- Diagnosing PD during an acute mood/psychotic episode.
- Therapeutic nihilism or pejorative use of "borderline" — it's treatable with a specific evidence base.
Pearls
- 🎯 Severity + traits (ICD‑11), and state vs trait is the core discrimination.
- 🩺 Borderline PD → structured psychotherapy (DBT) + risk management, medication adjunctive.
Next → What psychotherapy is and how it works (Concept 47).