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Association between dynamic resting-state functional connectivity and ketamine plasma levels in visual processing

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Esketamine significantly reduces dynamic functional connectivity in visual networks, both within and between hemispheres. This finding highlights potential mechanisms for ketamine

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Radiology

Background:

  • Ketamine influences resting-state functional connectivity (rsFC), but static and seed-based methods may be insufficient.
  • Dynamic rsFC estimation offers a more comprehensive approach to understanding brain connectivity.
  • Previous research links ketamine to altered sensory processing and psychosis models.

Purpose of the Study:

  • To investigate the robust effects of esketamine on dynamic rsFC using multiple analytical methods.
  • To identify specific brain networks affected by subanesthetic esketamine administration.

Main Methods:

  • Utilized resting-state fMRI data from 27 healthy subjects in a randomized, placebo-controlled, cross-over design.
  • Employed eight complementary methodologies combining two dynamic rsFC estimation techniques, two atlases, and two statistical measures.
  • Analyzed data under both subanesthetic intravenous esketamine and placebo conditions.

Main Results:

  • Consistent negative influence of esketamine on dynamic rsFC within the left visual network.
  • Significant inter-hemispheric reduction in dynamic rsFC between visual networks under esketamine.
  • These effects were robust across all tested analytical combinations (p < 0.05, corrected).

Conclusions:

  • Esketamine's impact on dynamic rsFC is highly stable within visual processing networks.
  • Findings may relate to ketamine's role as a psychosis model and its effects on visual processing.
  • Dynamic rsFC in sensory networks could be a key target for understanding ketamine's antidepressant effects, potentially due to NMDA-receptor expression.