4.6 Article

Using pre-treatment de novo threat conditioning outcomes to predict treatment response to DCS augmentation of exposure-based CBT

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JOURNAL OF PSYCHIATRIC RESEARCH
卷 164, 期 -, 页码 357-363

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpsychires.2023.06.008

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Threat conditioning; Extinction; Extinction retention; D-cycloserine; CBT; Social anxiety disorder

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Inconsistent findings regarding the efficacy of DCS augmentation in exposure-based CBT for anxiety disorders have motivated the search for moderators. This study found that threat conditioning outcomes, specifically extinction and extinction retention, can predict treatment response to DCS augmentation in social anxiety disorder.
Background: Over a decade and a half of research has resulted in inconsistent evidence for the efficacy of dcycloserine (DCS), a partial glutamatergic N-methyl-D-aspartate agonist, for augmenting exposure-based cognitive behavioral therapy (CBT) for anxiety- and fear-based disorders. These variable findings have motivated the search for moderators of DCS augmentation efficacy. Methods: In this secondary analysis of a previous randomized clinical trial, we evaluated the value of de novo threat conditioning outcomes-degree of threat acquisition, extinction, and extinction retention-for predicting treatment response to exposure-based CBT for social anxiety disorder, applied with and without DCS augmentation in a sample of 59 outpatients. Results: We found that average differential skin conductance response (SCR) during extinction and extinction retention significantly moderated the prediction of clinical response to DCS: participants with poorer extinction and extinction retention showed relatively improved treatment response with DCS. No such effects were found for expectancy ratings, consistent with accounts of DCS selectively aiding lower-order but not higher-order extinction learning. Conclusions: These findings provide support for extinction and extinction retention outcomes from threat conditioning as potential pre-treatment biomarkers for DCS augmentation benefits. Independent of DCS augmentation, the current study did not support threat conditioning outcomes as useful for predicting response to exposure-based CBT.

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