Time to Think of Aggression as a Treatment Target Symptom, Independent of Diagnosis

Introduction

• Aggression and Mental Illness:
  • Aggression and violence are not diagnostic features of any psychiatric disorder.
  • Society often associates severe mental illness with aggression and violence.
  • Excluding substance use, aggression rates in psychiatric patients are similar to the general population.
  • Current treatment of aggression is linked to treating the associated disorder, but new data suggest treating aggression as an independent target.

Pathophysiology of Aggression

• Dopamine D4 Receptor and Aggression:
  • Polymorphisms of the dopamine D4 receptor gene (DRD4) are associated with aggression.
  • DRD4 is located on chromosome 11 and affects the inhibitory G protein system and cAMP formation.
  • It is expressed in the frontal cortex, thalamus, hypothalamus, and olfactory bulb.
  • The 7-repeat allele (7R) is linked to ADHD, impulsivity, novelty seeking, and aggression.
• D4 Antagonists and Anti-Aggression:
  • D4 antagonists with high affinity can reduce aggression.
  • Table provided summarizes the affinities of antipsychotics.

Anti-Aggression Agents

• Clozapine:
  • Most effective anti-aggression agent, superior to risperidone, olanzapine, and haloperidol.
  • Shows significant reduction in aggressive behaviors.
  • Acts independently of its antipsychotic and sedative effects.
• Asenapine:
  • Demonstrated anti-aggression effects in clinical studies.
  • Effective in reducing hostility, irritability, and disruptive behavior.
• Loxapine:
  • Treats aggression in bipolar disorder and schizophrenia.
  • Effective independently of diagnosis.
• Olanzapine and Risperidone:
  • Have D4 affinities greater than D2, but related more to antipsychotic effects.

Concluding Thoughts

• Prefer agents with greater D4 vs D2 affinity when treating aggression.
• Clozapine is superior in studies targeting aggression.
• Clinicians may need to focus on treating aggression specifically, not just underlying disorders.

References

• Extensive references provided in the article to support claims and data.