Conduct Disorder and Oppositional Defiant Disorder

Risk factors

• Parental psychopathology (antisocial PD, substance use, depression)
• Harsh, inconsistent, or punitive parenting
• Family conflict, low socioeconomic status
• Peer rejection, deviant peer affiliation
• Neighborhood violence exposure
• Difficult temperament, low IQ, language delay
• Prenatal exposure to tobacco/alcohol
• Comorbid ADHD (strong predictor of progression from ODD to CD)

Pathophysiology

Heritable component substantial. Reduced amygdala response to others' distress in callous-unemotional CD; reduced prefrontal control of impulsivity. Gene-environment interactions (e.g., MAOA-low activity allele × maltreatment).

Differential diagnosis

• ADHD — Inattention and hyperactivity are core; defiance can result from impulsivity but is not driven by anger/argumentativeness — frequent comorbidity
• Major depressive disorder / disruptive mood dysregulation disorder — Irritability is mood-driven, persistent, with neurovegetative features; DMDD has chronic irritability + severe outbursts ≥3x/week age 6-18
• Bipolar disorder — Episodic; elevated/expansive mood, decreased sleep need
• Anxiety disorder — Avoidance may look like noncompliance; addressing anxiety resolves behavior
• Autism spectrum disorder — Rigidity and rule-following may produce conflict; communication/reciprocity deficits distinguish
• Substance use disorder — Especially in adolescent-onset CD
• Trauma / PTSD — Reactive aggression with hyperarousal and reexperiencing
• Antisocial PD (≥18 yo only) — Requires CD before age 15 + pattern of disregard for others' rights after 18

Diagnostic workup

Diagnostic algorithm

flowchart TD
  A[Disruptive behavior<br/>in child/adolescent] --> B{Violates others' rights<br/>or major societal norms?}
  B -->|Yes| C{≥3 of 15 criteria<br/>past 12 mo?}
  C -->|Yes| D[Conduct Disorder]
  D --> E{Onset <10 yo?}
  E -->|Yes| F[Childhood-onset CD<br/>worse prognosis]
  E -->|No| G[Adolescent-onset CD]
  D --> H[Specify: with limited<br/>prosocial emotions]
  B -->|No| I{Angry/argumentative/<br/>vindictive ≥6 mo?}
  I -->|Yes| J[Oppositional Defiant Disorder]
  I -->|No| K[Consider ADHD, mood,<br/>anxiety, ASD, DMDD]
  J --> L[Parent management training<br/>+ treat comorbid ADHD]
  D --> M[Multisystemic / family therapy<br/>± medication for comorbidities]

Treatment

Complications

• Progression of childhood-onset CD to antisocial personality disorder (~40%)
• Substance use disorders
• Academic failure, school dropout
• Juvenile justice involvement and incarceration
• Comorbid mood and anxiety disorders, suicide (CD with depression has high suicide risk)
• Injury, sexually transmitted infections, early parenthood

PANCE pearls

• ODD frequently precedes CD; not all ODD progresses to CD.
• Childhood-onset CD (<10 yo) has worse prognosis and higher conversion to antisocial PD than adolescent-onset.
• Callous-unemotional specifier identifies a subgroup with elevated risk and reduced treatment response — flag early.
• Treat comorbid ADHD; stimulants reduce aggression independently of mood improvement.
• Avoid group treatments mixing antisocial peers — peer contagion can worsen behavior.

References

• DSM-5-TR — American Psychiatric Association. DSM-5-TR. 2022.
• AACAP 2007 — American Academy of Child and Adolescent Psychiatry. Practice Parameter for the Assessment and Treatment of Children and Adolescents with Oppositional Defiant Disorder. J Am Acad Child Adolesc Psychiatry 2007;46:126-141.
• NICE NG10 — National Institute for Health and Care Excellence. Antisocial behaviour and conduct disorders in children and young people: recognition and management. NG10/CG158, 2013/updated.