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Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials
BACKGROUND: The hippocampus plays an important role in the pathophysiology of posttraumatic stress disorder (PTSD) and its prognosis. Accumulating findings suggest that individuals with larger pretreatment hippocampal volume are more likely to benefit from PTSD treatment, but the mechanism underlyin...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10593870/ https://www.ncbi.nlm.nih.gov/pubmed/37881552 http://dx.doi.org/10.1016/j.bpsgos.2023.01.005 |
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author | Zilcha-Mano, Sigal Duek, Or Suarez-Jimenez, Benjamin Zhu, Xi Lazarov, Amit Helpman, Liat Korem, Nachshon Malka, Michal Harpaz-Rotem, Ilan Neria, Yuval |
author_facet | Zilcha-Mano, Sigal Duek, Or Suarez-Jimenez, Benjamin Zhu, Xi Lazarov, Amit Helpman, Liat Korem, Nachshon Malka, Michal Harpaz-Rotem, Ilan Neria, Yuval |
author_sort | Zilcha-Mano, Sigal |
collection | PubMed |
description | BACKGROUND: The hippocampus plays an important role in the pathophysiology of posttraumatic stress disorder (PTSD) and its prognosis. Accumulating findings suggest that individuals with larger pretreatment hippocampal volume are more likely to benefit from PTSD treatment, but the mechanism underlying this effect is unknown. We investigated whether further increase in hippocampal volume during treatment explains the better prognosis of individuals with greater pretreatment hippocampal volume. METHODS: We collected structural magnetic resonance imagesfrom patients with PTSD before and after treatment. We examined whether larger hippocampal volume moderates the effect of increased hippocampal volume during treatment on symptom reduction. Given the relatively small sample sizes of treatment studies with pre- and posttreatment magnetic resonance imaging, we focused on effect sizes and sought to replicate findings in an external sample. We tested our hypothesis in study 1 (N = 38; prolonged exposure therapy) and then tested whether the results could be externally replicated in study 2 (N = 20; ketamine infusion followed by exposure therapy). RESULTS: Findings from study 1 revealed that increased right hippocampal volume during treatment was associated with greater PTSD symptom reduction only in patients with greater pretreatment right hippocampal volume (p = .03; η(2) = 0.13, a large effect). Findings were partially replicated in study 2 for depressive symptoms (p = .034; η(2) = 0.25, a very large effect) and for PTSD symptoms (p = .15; η(2) = 0.15, a large effect). CONCLUSIONS: Elucidating increased hippocampal volume as one of the neural mechanisms predictive of therapeutic outcome for individuals with larger pretreatment hippocampal volume may help identify clinical targets for this subgroup. |
format | Online Article Text |
id | pubmed-10593870 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-105938702023-10-25 Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials Zilcha-Mano, Sigal Duek, Or Suarez-Jimenez, Benjamin Zhu, Xi Lazarov, Amit Helpman, Liat Korem, Nachshon Malka, Michal Harpaz-Rotem, Ilan Neria, Yuval Biol Psychiatry Glob Open Sci Archival Report BACKGROUND: The hippocampus plays an important role in the pathophysiology of posttraumatic stress disorder (PTSD) and its prognosis. Accumulating findings suggest that individuals with larger pretreatment hippocampal volume are more likely to benefit from PTSD treatment, but the mechanism underlying this effect is unknown. We investigated whether further increase in hippocampal volume during treatment explains the better prognosis of individuals with greater pretreatment hippocampal volume. METHODS: We collected structural magnetic resonance imagesfrom patients with PTSD before and after treatment. We examined whether larger hippocampal volume moderates the effect of increased hippocampal volume during treatment on symptom reduction. Given the relatively small sample sizes of treatment studies with pre- and posttreatment magnetic resonance imaging, we focused on effect sizes and sought to replicate findings in an external sample. We tested our hypothesis in study 1 (N = 38; prolonged exposure therapy) and then tested whether the results could be externally replicated in study 2 (N = 20; ketamine infusion followed by exposure therapy). RESULTS: Findings from study 1 revealed that increased right hippocampal volume during treatment was associated with greater PTSD symptom reduction only in patients with greater pretreatment right hippocampal volume (p = .03; η(2) = 0.13, a large effect). Findings were partially replicated in study 2 for depressive symptoms (p = .034; η(2) = 0.25, a very large effect) and for PTSD symptoms (p = .15; η(2) = 0.15, a large effect). CONCLUSIONS: Elucidating increased hippocampal volume as one of the neural mechanisms predictive of therapeutic outcome for individuals with larger pretreatment hippocampal volume may help identify clinical targets for this subgroup. Elsevier 2023-02-03 /pmc/articles/PMC10593870/ /pubmed/37881552 http://dx.doi.org/10.1016/j.bpsgos.2023.01.005 Text en © 2023 The Authors https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Archival Report Zilcha-Mano, Sigal Duek, Or Suarez-Jimenez, Benjamin Zhu, Xi Lazarov, Amit Helpman, Liat Korem, Nachshon Malka, Michal Harpaz-Rotem, Ilan Neria, Yuval Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials |
title | Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials |
title_full | Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials |
title_fullStr | Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials |
title_full_unstemmed | Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials |
title_short | Underlying Hippocampal Mechanism of Posttraumatic Stress Disorder Treatment Outcome: Evidence From Two Clinical Trials |
title_sort | underlying hippocampal mechanism of posttraumatic stress disorder treatment outcome: evidence from two clinical trials |
topic | Archival Report |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10593870/ https://www.ncbi.nlm.nih.gov/pubmed/37881552 http://dx.doi.org/10.1016/j.bpsgos.2023.01.005 |
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