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Is cognitive dysfunction involved in difficult-to-treat depression? Characterizing resistance from a cognitive
Clara López-Solà1,2,3, Marta Subirà1,3, Maria Serra-Blasco1
1Mental Health Department, Parc Taulí Hospital Universitari, Neuroscience and Mental Health Research Area, Institut d'Investigació i Innovació Parc Taulí (I3PT), Sabadell, Spain.
Summary
Difficult-to-treat depression (DTD) and treatment-resistant depression (TRD) are linked to verbal memory deficits and severe depressive symptoms. These factors increase the risk for TRD, suggesting a need for comprehensive evaluation and treatment approaches.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Psychology
Background:
- Major depression is a prevalent mental health condition.
- Difficult-to-treat depression (DTD) and treatment-resistant depression (TRD) pose significant clinical challenges.
- Identifying factors associated with DTD/TRD is crucial for improving patient outcomes.
Purpose of the Study:
- To identify clinical and cognitive factors predicting the risk of developing difficult-to-treat depression (DTD) or treatment-resistant depression (TRD).
- To understand the relationship between cognitive function, depressive symptom severity, and treatment resistance in major depression.
Main Methods:
- A cohort of 229 adult outpatients with major depression was analyzed.
- Participants were classified into resistant and non-resistant groups based on the Maudsley Staging Model.
- Logistic regression was employed to determine factors associated with TRD risk, comparing sociodemographic, clinical, and cognitive variables.
Main Results:
- Patients in the treatment-resistant depression (TRD) group exhibited significantly greater verbal memory impairment compared to the non-resistant group.
- Logistic regression revealed that low verbal memory scores (OR: 2.02) and high depressive symptom severity (OR: 1.29) were independently associated with an increased risk of TRD.
- These associations remained significant regardless of pharmacological treatment or current depressive symptom levels.
Conclusions:
- Findings support neuroprogression models of depression, suggesting that greater severity (indicated by verbal memory deficits and depressive symptoms) correlates with a more resistant illness profile due to neurobiological changes.
- The results advocate for a comprehensive approach to evaluating and treating DTD to potentially alter the illness course.
- Further longitudinal research is recommended to validate the predictive role of verbal memory and depression severity in TRD development.
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