Subcallosal cingulate DBS: stimulating specific tracts was associated with response

Design

Retrospective multi-cohort analysis with volume-of-tissue-activated and fibre-wise mapping

Population

131 adults with treatment-resistant depression who received bilateral subcallosal cingulate DBS

Primary outcome

Response, at least 50% reduction in 17-item Hamilton Depression Rating Scale score

Effect

Failure to activate the left cingulum bundle and medial uncinate fasciculus was associated with reduced benefit; no single effect size reported in the abstract

This retrospective analysis pooled 131 people with treatment-resistant depression who had bilateral subcallosal cingulate deep brain stimulation across three cohorts. Response was a drop of at least 50% on the 17-item Hamilton scale.

Using each patient's stimulation settings, the authors modelled the tissue activated and mapped it onto white matter tracts. Responders had a less variable pattern of activated tissue. Not activating the left cingulum bundle and the medial uncinate fasciculus was associated with weaker benefit.

The authors suggest connectome-guided targeting could outperform targeting by anatomical landmarks. That remains a hypothesis: the study was retrospective, used modelled rather than measured stimulation fields and did not compare targeting methods prospectively. It is relevant mainly to centres offering DBS, not to routine practice.

• DBS for depression remains a specialist, research-oriented treatment; this study does not widen the indication.
• Targeting precision may matter, according to this retrospective mapping.
• A prospective comparison of connectome-guided and landmark targeting is still needed.
• When counselling, describe benefit as uncertain and dependent on the centre and technique.

Why it matters

It points to why DBS results vary between patients and what a better-targeted trial could test.

Don't overread it

Retrospective and model-based; it does not show that connectome-guided targeting improves response.

The statistics, in plain English

A link between stimulated tracts and response in a retrospective dataset does not show that changing the target improves outcomes. Modelled fields are estimates, and patients were not randomised to targeting methods.

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