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BPD

Borderline Personality Disorder

Cluster B — Dramatic / Emotional / Erratic · Table 5.2 [1]

Pervasive instability of affect, identity, and relationships with marked impulsivity and frantic efforts to avoid abandonment.

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Characteristics (Table 5.2) [1]

Triggering Event(s)Expectation of meeting personal goals and/or maintaining close relationships
Behavioral Style
  • Impulsivity
  • Acting out behaviors
  • Helpless, empty “void”
Interpersonal Style
  • Fear of abandonment
  • Unstable, intense relationships
  • Alternates between extremes of idealization and devaluation
Cognitive Style
  • Inflexible, rigid thinking
  • Failure to learn from experience
  • External loss of control
Affective Style
  • Emotionally reactive and dysregulated
  • Inappropriate, intense anger
  • Extreme lability of mood and affect
Temperament
  • Dependent type: passive infantile pattern — low autonomic nervous system reactivity
  • Histrionic type: hyperresponsive infantile pattern — high autonomic reactivity
  • Passive-Aggressive type: “difficult” infantile pattern — affect irritability
Attachment StyleDisorganized
Parental Injunction
  • “If you grow up, bad things will happen to me [parent].”
  • Overprotective or demanding or inconsistent parenting
Self-View
  • “I don't know who I am or where I'm going.”
  • Identity problems involving gender, career, loyalties, and values
  • Self-esteem fluctuates with current emotion
World-View“People are great, no they're not. Having goals is good, no it's not. If life doesn't go my way, I can't tolerate it. Don't commit to anything.”
Maladaptive Schemas
  • Abandonment
  • Defectiveness
  • Abuse/mistrust
  • Emotional deprivation
  • Social isolation
  • Insufficient self-control
Optimal Diagnostic CriterionFrantic efforts to avoid real or imagined abandonment.

DSM diagnostic criteria

Essential feature

A pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity, beginning by early adulthood.

Criteria — 5 or more of 9 criteria
  • Frantic efforts to avoid real or imagined abandonment.
  • Unstable, intense relationships alternating between idealization and devaluation.
  • Identity disturbance — markedly and persistently unstable self-image.
  • Impulsivity in at least two potentially self-damaging areas (spending, sex, substances, driving, bingeing).
  • Recurrent suicidal behavior, gestures, threats, or self-mutilation.
  • Affective instability due to marked reactivity of mood.
  • Chronic feelings of emptiness.
  • Inappropriate, intense anger or difficulty controlling anger.
  • Transient, stress-related paranoid ideation or severe dissociative symptoms.
Key differentials
  • Bipolar disorder (sustained episodes vs. rapid, reactive mood shifts)
  • Histrionic PD (attention-seeking without self-harm/abandonment terror)
  • Narcissistic PD (instability driven by self-esteem injury, not abandonment)
  • Complex PTSD
  • Substance-induced mood instability

Treatment

Goals
  • Reduce self-harm and suicidality (life-threatening behaviors first)
  • Build affect-regulation and distress-tolerance skills
  • Stabilize identity and interpersonal functioning
  • Reduce treatment-interfering behaviors
Strategy

Hold a validating yet change-oriented stance (the dialectic of acceptance and change). Use a clear target hierarchy, a consistent frame, and explicit crisis/safety planning. Manage idealization-devaluation splits without retaliating or rescuing; coordinate care to prevent splitting across providers.

Modalities
  • Dialectical Behavior Therapy (DBT)
  • Mentalization-Based Treatment (MBT)
  • Transference-Focused Psychotherapy (TFP)
  • Schema therapy / Good Psychiatric Management (GPM)
Interventions
  • Behavioral chain analysis of self-harm and crisis behaviors.
  • Distress-tolerance and emotion-regulation skills (e.g., TIPP, opposite action).
  • Validation paired with explicit invitations to change.
  • Collaborative safety planning and clear between-session contact rules.
Common obstacles
  • Idealization → devaluation ruptures and risk of dropout
  • Self-harm and suicidality that pull the frame off-target
  • Splitting between treatment providers
  • Therapist burnout / countertransference
Prognosis

Good with structured, evidence-based treatment — most patients no longer meet criteria over time, though functional recovery lags symptom remission.

Practise this presentation

Sophie — After a breakup, a crisis that swings within the hour
26-year-old presenting after self-harm following a breakup; idealises then devalues the assessor within a single session.
Advanced

For training only. Diagnostic criteria are summarised — consult the full sources [1,2] for the complete text; see References. Not a substitute for supervised clinical assessment.