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  • Adjunctive...

Adjunctive D-cycloserine may enhance antidepressant effect of transcranial magnetic stimulation in MDD

Dr. Shivi KatariaWritten by Dr. Shivi Kataria Published On 2022-10-27T20:00:11+05:30  |  Updated On 27 Oct 2022 2:30 PM GMT
Adjunctive D-cycloserine may enhance antidepressant effect of transcranial magnetic stimulation in MDD

The antidepressant effects of transcranial magnetic stimulation (TMS) protocols for major depressive disorder (MDD) are thought to depend on synaptic plasticity. The theta-burst stimulation (TBS) protocol synaptic plasticity is known to be N-methyl-D-aspartate (NMDA)–receptor dependent, yet it is unknown whether enhancing NMDA-receptor signalling improves treatment outcomes in MDD.In...

The antidepressant effects of transcranial magnetic stimulation (TMS) protocols for major depressive disorder (MDD) are thought to depend on synaptic plasticity. The theta-burst stimulation (TBS) protocol synaptic plasticity is known to be N-methyl-D-aspartate (NMDA)–receptor dependent, yet it is unknown whether enhancing NMDA-receptor signalling improves treatment outcomes in MDD.

In the recently published results from a randomised control trial, authors Cole et al have shown that adjunctive D-cycloserine (DCS) when used with intermittent theta-burst stimulation led to greater improvements in depressive symptoms compared with stimulation alone.

Repetitive transcranial magnetic stimulation (rTMS) and more recently, theta-burst stimulation (TBS), are the noninvasive brain stimulation modalities with the largest evidence base in MDD. One potential strategy to improve outcomes is to adjunctively target the N-methyl-D-aspartate (NMDA) receptor during stimulation, an ionotropic glutamate receptor and key regulator of synaptic plasticity.

Authors hypothesized that adjunctive DCS would lead to greater reductions in depressive symptoms than placebo. In this single-site 4-week, double-blind, placebo-controlled, randomized clinical trial, 50 participants with MDD were included.

Participants were randomly assigned 1:1 to either iTBS plus placebo or iTBS plus D-cycloserine (100 mg) for the first 2 weeks followed by iTBS without an adjunct for weeks 3 and 4.

The primary outcome was change in depressive symptoms as measured by the Montgomery-Ã…sberg Depression Rating Scale (MADRS) at the conclusion of treatment. Secondary outcomes included clinical response, clinical remission, and Clinical Global Impression (CGI) scores.

The study found that:

1. The iTBS plus D-cycloserine group had greater improvements in MADRS scores compared with the iTBS plus placebo group.

2. Rates of clinical response were higher in the iTBS plus D-cycloserine group than in the iTBS plus placebo group (73.9% vs 29.3%), as were rates of clinical remission (39.1% vs 4.2%). This was reflected in lower CGI-severity ratings and greater CGI-improvement ratings.

3. No serious adverse events occurred.

These findings are important, because if replicated in large multicenter studies, an adjunct is deployable within existing TMS and health systems infrastructure to improve outcomes in MDD.

Results of this randomized clinical trial suggest that adjunctive DCS may be a promising strategy for improving TMS treatment outcomes in MDD using iTBS. Replication in a larger multisite study is required, as is additional investigation into intersectional approaches with other dosing regimens and precision medicine targeting approaches.

Source: JAMA Psychiatry: doi:10.1001/jamapsychiatry.2022.3255

major depressive disorder Transcranial magnetic stimulation intermittent theta-burst stimulation 
Dr. Shivi Kataria
Dr. Shivi Kataria

    M.B.B.S, M.D. Psychiatry

    M.B.B.S, M.D. Psychiatry (Teerthanker Mahavir University, U.P.) Currently working as Senior Resident in Department of Psychiatry, Institute of Human Behaviour and Allied Sciences (IHBAS) Dilshad Garden, New Delhi. Actively involved in various research activities of the department.

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