Electric field causes volumetric changes in the human brain

Elife. 2019 Oct 23:8:e49115. doi: 10.7554/eLife.49115.

Abstract

Recent longitudinal neuroimaging studies in patients with electroconvulsive therapy (ECT) suggest local effects of electric stimulation (lateralized) occur in tandem with global seizure activity (generalized). We used electric field (EF) modeling in 151 ECT treated patients with depression to determine the regional relationships between EF, unbiased longitudinal volume change, and antidepressant response across 85 brain regions. The majority of regional volumes increased significantly, and volumetric changes correlated with regional electric field (t = 3.77, df = 83, r = 0.38, p=0.0003). After controlling for nuisance variables (age, treatment number, and study site), we identified two regions (left amygdala and left hippocampus) with a strong relationship between EF and volume change (FDR corrected p<0.01). However, neither structural volume changes nor electric field was associated with antidepressant response. In summary, we showed that high electrical fields are strongly associated with robust volume changes in a dose-dependent fashion.

Keywords: ECT; depression; electric field modeling; human; human biology; medicine; neuroimaging; volume change.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Amygdala / diagnostic imaging
  • Amygdala / drug effects
  • Amygdala / pathology
  • Amygdala / radiation effects
  • Antidepressive Agents / therapeutic use
  • Brain Mapping
  • Depression / diagnostic imaging
  • Depression / pathology
  • Depression / therapy*
  • Electroconvulsive Therapy / adverse effects*
  • Electromagnetic Radiation
  • Female
  • Hippocampus / diagnostic imaging
  • Hippocampus / drug effects
  • Hippocampus / pathology
  • Hippocampus / radiation effects
  • Humans
  • Magnetic Resonance Imaging
  • Male
  • Middle Aged
  • Organ Size / drug effects
  • Organ Size / radiation effects
  • Temporal Lobe / diagnostic imaging
  • Temporal Lobe / drug effects
  • Temporal Lobe / pathology
  • Temporal Lobe / radiation effects

Substances

  • Antidepressive Agents