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Longitudinal Changes After Amygdala Surgery for Intractable Aggressive Behavior: Clinical, Imaging Genetics, and

Flavia Venetucci Gouveia1,2, Jürgen Germann3, Rosa de Morais4

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Summary

Bilateral amygdala ablation reduced aggression and agitation in patients with intractable aggressive behavior (iAB), improving quality of life. This neuromodulatory intervention offers potential new targets for treating aggression.

Keywords:
Aggressive behaviorAmygdalaDeformation-based morphometryMagnetic resonance imagingNeurosurgeryTestosterone

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Area of Science:

  • Neuroscience
  • Neurosurgery
  • Psychiatry

Background:

  • Intractable aggressive behavior (iAB) significantly impairs quality of life for psychiatric patients, presenting treatment challenges and high caregiver burden.
  • The amygdala, a critical brain region for aggressive behavior (AB), is a potential target for neuromodulatory interventions.
  • Current treatments for iAB are limited, necessitating exploration of novel therapeutic approaches.

Purpose of the Study:

  • To present clinical and imaging findings from a case series of iAB patients treated with bilateral amygdala ablation.
  • To evaluate the efficacy and safety of radiofrequency ablation of the amygdala for severe aggressive behavior.

Main Methods:

  • Four male patients (19-32 years old) with iAB, characterized by self-injury and social aggression, underwent bilateral amygdala radiofrequency ablation.
  • Pre- and post-treatment assessments included clinical, psychiatric, and neurosurgical evaluations, quantifying aggression, agitation, quality of life, and utilizing MRI.
  • Correlation analysis was performed between aggressive behavior, testosterone levels, and the testosterone/cortisol ratio.

Main Results:

  • Bilateral amygdala ablation resulted in decreased aggression and agitation, alongside improved quality of life.
  • Post-surgical imaging revealed significant volumetric reductions in brain areas associated with AB and increases in somatosensation-related regions.
  • No clinically significant side effects were observed, and lesion locations were confirmed via MRI.

Conclusions:

  • Bilateral amygdala ablation is a potentially effective treatment for intractable aggressive behavior, with observed improvements in clinical symptoms and quality of life.
  • Findings suggest altered somatosensation and provide insights into the neurocircuitry of aggression, highlighting novel neuromodulation targets.
  • The study underscores the amygdala's role in aggressive behavior and the potential of targeted ablation therapies.