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Related Experiment Video

Updated: Mar 27, 2026

MRI-guided dmPFC-rTMS as a Treatment for Treatment-resistant Major Depressive Disorder
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Is treatment-resistant depression a useful concept?

Gin S Malhi1, Yulisha Byrow2

  • 1Department of Psychiatry, CADE Clinic, Royal North Shore Hospital, Sydney, New South Wales, Australia; Discipline of Psychiatry, Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia; Kolling Institute, Northern Clinical School, University of Sydney, Sydney, New South Wales, Australia.

Evidence-Based Mental Health
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PubMed
Summary
This summary is machine-generated.

Defining treatment-resistant depression (TRD) is challenging, especially regarding medication response. A clearer definition is crucial for understanding depression and developing new treatments.

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Pharmacology

Background:

  • Treatment-resistant depression (TRD) is a common challenge in mood disorder management.
  • Current definitions primarily focus on pharmacotherapy, but lack nuance regarding treatment response and duration.
  • A precise definition of TRD is essential for both clinical practice and research advancement.

Purpose of the Study:

  • To critically review the concept of treatment resistance in depression.
  • To propose a clearer definition of TRD for improved understanding and clinical application.
  • To facilitate the development of novel antidepressants and therapy-defined depressive subtypes.

Main Methods:

  • Conceptual review of existing definitions of treatment resistance.
  • Analysis of the limitations in current pharmacotherapy-focused definitions.
  • Discussion on the implications of a refined TRD definition for research and clinical trials.

Main Results:

  • The concept of treatment resistance in depression lacks a universally agreed-upon definition.
  • Existing definitions struggle to encompass the variability in patient response and treatment duration.
  • A more precise definition could lead to identifying distinct depressive subtypes.

Conclusions:

  • A clearer, more comprehensive definition of treatment-resistant depression is needed.
  • Refined definitions will aid in understanding depression heterogeneity.
  • Improved definitions are vital for advancing antidepressant discovery and optimizing treatment strategies.