Conduct Disorder

Conduct Disorder (CD): A Comprehensive Guide

Core Definition

Conduct Disorder is a serious behavioral and emotional disorder characterized by a persistent pattern of violating societal norms and the rights of others. It typically emerges in childhood or adolescence and is a precursor to Antisocial Personality Disorder (ASPD) in adulthood (if symptoms persist past age 18).

DSM-5 Diagnostic Criteria

Required: ≥3 symptoms in past 12 months (with ≥1 in past 6 months) across four categories:

1. Aggression to People/Animals
   • Bullies/threatens others
   • Initiates physical fights
   • Used weapons to harm others
   • Physically cruel to people/animals
   • Forced sexual activity
2. Property Destruction
   • Deliberate fire-setting
   • Vandalism/destruction of property
3. Deceitfulness/Theft
   • Breaking/entering homes/cars
   • Frequent lying for personal gain
   • Stealing without confrontation (shoplifting, forgery)
4. Serious Rule Violations
   • Staying out past curfew before age 13
   • Running away from home overnight
   • Truancy before age 13

Additional Specifiers:

• With Limited Prosocial Emotions (LPE): Callous-unemotional traits (lack guilt/remorse, shallow emotions, unconcerned about performance)
• Childhood-Onset (<10 years): Poorer prognosis
• Adolescent-Onset (≥10 years): Better prognosis

Clinical Presentation

Behavioral Signs:

• Frequent school suspensions/expulsions
• Early sexual activity/substance use
• Animal cruelty (red flag for severe pathology)
• “Streetwise” demeanor beyond developmental level

Emotional/Cognitive Traits:

• Lack of empathy for victims
• Inflated self-esteem (justifies harmful actions)
• Impaired moral reasoning (concrete reward/punishment focus)

Neurobiological Markers:

• Reduced amygdala response to distress cues
• Prefrontal cortex dysfunction (poor impulse control)
• Low resting heart rate (fearlessness biomarker)

Epidemiology & Risk Factors

Prevalence:

• 2-10% of children (higher in males before puberty)
• 30-50% of youth in detention centers

Developmental Pathways:

1. Early Starter Pathway (Life-Course Persistent):
   • Conduct problems by age 5
   • Often comorbid ADHD
   • High genetic loading
   • Poor adult outcomes
2. Adolescent-Limited Pathway:
   • Emerges with puberty
   • Peer-influenced behavior
   • Better prognosis

Environmental Risks:

• Parental: Harsh/inconsistent discipline, parental ASPD
• Community: Poverty, gang exposure
• Trauma: Physical/sexual abuse

Evidence-Based Treatments

Psychosocial Interventions (First-Line)

1. Parent Management Training (PMT):
   • Teaches consistent discipline
   • Uses token economies
   • E.g., Incredible Years, Triple P
2. Multisystemic Therapy (MST):
   • Intensive family/community-based
   • 60% reduction in recidivism
3. Cognitive Behavioral Approaches:
   • Anger coping training
   • Moral reasoning therapy
4. School-Based Interventions:
   • Daily report cards
   • Peer mediation programs

Pharmacotherapy (Target Symptoms)

• Stimulants (e.g., methylphenidate): For comorbid ADHD
• Atypical antipsychotics (e.g., risperidone): For aggression
• Mood stabilizers (e.g., lithium): For explosive anger

Differential Diagnosis

Condition	Distinguishing Features
ADHD	Hyperactivity without malice
ODD	Defiance without criminal behavior
Depression	Irritability with sad mood
PTSD	Aggression linked to trauma triggers

Prognosis & Prevention

Poor Outcome Predictors:

• Early onset (<10 years)
• Callous-unemotional traits
• Family history of ASPD

Protective Factors:

• High IQ
• Positive mentor relationships
• Early intervention

Prevention Strategies:

• Preschool social-emotional programs
• Home visitation for at-risk families
• Community mentoring initiatives

Forensic Considerations

• Not criminally responsible if <18 in most jurisdictions
• Risk assessment tools: SAVRY, PCL:YV
• Diversion programs preferred over incarceration