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Pharmacopsychiatry
DOI: 10.1055/a-2499-7207
Original Paper

Rapid Antidepressant and Antisuicidal Effects of Low-Dose Ketamine Infusion in Patients With Treatment-Resistant Depression With or Without Low-Grade Inflammation

Mu-Hong Chen
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4   Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei, Taiwan
,
Tung-Ping Su
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
3   Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
4   Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei, Taiwan
5   Department of Psychiatry, Cheng Hsin General Hospital, Taipei, Taiwan
,
Wei-Chen Lin
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4   Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei, Taiwan
,
Cheng-Ta Li
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4   Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei, Taiwan
,
Hui-Ju Wu
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
,
Shih-Jen Tsai
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4   Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei, Taiwan
,
Ya-Mei Bai
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
4   Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei, Taiwan
,
Wei-Chung Mao
5   Department of Psychiatry, Cheng Hsin General Hospital, Taipei, Taiwan
,
Pei-Chi Tu
1   Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan
2   Division of Psychiatry, Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
3   Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
› Author Affiliations Funding The study was supported by grant from Taipei Veterans General Hospital (V111C-010, V111C-040, V111C-029, V112C-033, V113C-010, V113C-011, V113C-039), Yen Tjing Ling Medical Foundation (CI-109-21, CI-109-22, CI-110-30, CI-113-30, CI-113-31, CI-113-32), Ministry of Science and Technology, Taiwan (MOST110-2314-B-075-026, MOST110-2314-B-075-024 -MY3, MOST 109-2314-B-010-050-MY3, MOST111-2314-B-075 -014 -MY2, MOST 111-2314-B-075 -013, NSTC111-2314-B-A49-089-MY2), Taipei, Taichung, Kaohsiung Veterans General Hospital, Tri-Service General Hospital, Academia Sinica Joint Research Program (VTA112-V1-6-1, VTA113-V1-5-1) and Veterans General Hospitals and University System of Taiwan Joint Research Program (VGHUST112-G1-8-1, VGHUST113-G1-8-1). The funding source had no role in any process of our study.
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Abstract

Background

Low-grade inflammation (LGI) contributes to resistance against traditional antidepressants. However, whether the antidepressant and antisuicidal effects of ketamine on patients with treatment-resistant depression (TRD) differ between those with LGI and those without LGI remains unknown.

Methods

This study included 167 patients with TRD, among whom 46 had LGI and 121 did not have LGI. The patients received a single infusion of either low-dose ketamine or a placebo. A C-reactive protein level of≥3 mg/L indicated LGI. Depressive symptoms were measured from baseline to day 3 by using the 17-item Hamilton Depression Rating Scale (HDRS) and the Montgomery-Asberg Depression Rating Scale (MADRS).

Results

Generalized estimating equation models revealed antidepressant effect of ketamine in patients with no LGI (HDRS scores: p<0.001; MADRS scores: p<0.001) but not in patients with LGI (all p>0.05). The antisuicidal effect of ketamine (indicated by the score on item 10 of the MADRS) was observed in both groups of patients with (p=0.046) and without LGI (p<0.001). However, ketamine was effective for TRD regardless of whether inflammation levels were high or low, while the placebo response was notably greater only in patients with LGI.

Discussion

This study suggests that among patients with TRD, only those without LGI respond to low-dose ketamine infusion. Whether the negative findings of the antidepressant effect of ketamine among patients with LGI may be because of the effect of the placebo infusion needs further investigation. Further randomized, placebo-controlled studies are needed to validate these findings.

Keywords

low-grade inflammation - ketamine - antidepressant effect - antisuicidal effect


Publication History

Received: 09 October 2024

Accepted: 01 December 2024

Article published online:
20 December 2024

© 2024. Thieme. All rights reserved.

Georg Thieme Verlag
Rüdigerstraße 14, 70469 Stuttgart, Germany

 

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