Management of Treatment-Resistant Depression: Challenges and Strategies

Summary & key facts

This paper is a careful review of research about treatment-resistant depression. The authors looked through medical studies to see how doctors define this kind of depression, what makes it hard to assess, and which treatments have been tried. They describe drug strategies like adding lithium or thyroid hormone, switching antidepressant types, several kinds of brain-stimulation treatments, psychotherapy, and newer options being tested such as ketamine and psilocybin. The main point is that many approaches exist, but definitions and evidence are inconsistent, and bigger studies are needed to know which treatments work best for which people.

Key facts:

• Treatment-resistant depression is usually used for people whose depression does not get better after trying at least two standard antidepressant medicines.
• There is no single agreed definition or staging system for treatment-resistant depression, which makes it hard for doctors and researchers to compare studies.
• Researchers reviewed many studies and found several common treatment paths: adding another drug (augmentation), switching the antidepressant to a different type, using brain-stimulation treatments, and using psychotherapy.
• Common drug add-ons that have been studied include lithium, a thyroid hormone called triiodothyronine, and newer antipsychotic medicines.
• Brain-stimulation options covered by the review include electroconvulsive therapy, repetitive transcranial magnetic stimulation, magnetic seizure therapy, and deep brain stimulation.
• Newer or experimental treatments are being tested, including ketamine, psilocybin (a psychedelic), and anti-inflammatory drugs, but the review says more large studies are needed before clear rules can be made.
• Because definitions and study methods vary, the review warns that we still do not have clear, evidence-based treatment pathways that reliably tell doctors which option to try first or next.

Abstract

Treatment-resistant depression (TRD) is a subset of Major Depressive Disorder which does not respond to traditional and first-line therapeutic options. There are several definitions and staging models of TRD and a consensus for each has not yet been established. However, in common for each model is the inadequate response to at least 2 trials of antidepressant pharmacotherapy. In this review, a comprehensive analysis of existing literature regarding the challenges and management of TRD has been compiled. A PubMed search was performed to assemble meta-analyses, trials and reviews on the topic of TRD. First, we address the confounds in the definitions and staging models of TRD, and subsequently the difficulties inherent in assessing the illness. Pharmacological augmentation strategies including lithium, triiodothyronine and second-generation antipsychotics are reviewed, as is switching of antidepressant class. Somatic therapies, including several modalities of brain stimulation (electroconvulsive therapy, repetitive transcranial magnetic stimulation, magnetic seizure therapy and deep brain stimulation) are detailed, psychotherapeutic strategies and subsequently novel therapeutics including ketamine, psilocybin, anti-inflammatories and new directions are reviewed in this manuscript. Our review of the evidence suggests that further large-scale work is necessary to understand the appropriate treatment pathways for TRD and to prescribe effective therapeutic options for patients suffering from TRD.

Topics

Electroconvulsive Therapy Studies Treatment of Major Depression Tryptophan and brain disorders

Categories

Health Sciences Medicine Pharmacology

Tags

Antidepressant Anxiety Bipolar disorder Brain stimulation Deep brain stimulation Depression (economics) Disease Economics Electroconvulsive therapy Intensive care medicine Internal medicine Lithium (medication) Macroeconomics Major depressive disorder Medicine Modalities Mood Parkinson's disease Psychiatry Psychology Psychotherapist Schizophrenia (object-oriented programming) Social science Sociology Stimulation Transcranial magnetic stimulation Treatment-resistant depression Vagus nerve Vagus nerve stimulation

Substances

Ketamine Psilocybin

Conditions & symptoms

Anxiety Depression Lack of energy or motivation Poor sleep Sadness or low mood