Real-world Effectiveness of Intravenous Ketamine for Suicidal Ideation in Treatment-Resistant Depression
Bibliographic record
Abstract
Suicidal ideation is a significant symptom associated with mood disorders. Clinical trials havedemonstrated rapid reduction in suicidal ideation following ketamine infusions, however, clinical trial results are not always generalizable to real world practice. A real world effectiveness analysis of 96 adult outpatients with treatment-resistant depression (TRD) that received ketamine infusions in a community clinic in Toronto, Ontario was conducted. Suicidality and depressive symptom outcomes were assessed with the Columbia Suicide Severity Rating Scale (C-SSRS) (self-report version) and the Quick Inventory for Depressive Symptomatology Self-Report 16-Item respectively. Mean C-SSRS score significantly decreased following a single ketamine infusion and was indicative of a reduction in suicidality from active to passive suicidal ideation on a group level. Results of the mediation analysis indicated that the antisuicidal effects of ketamine are partially independent of its antidepressant effects. This study suggests that ketamine is effective in reducing suicidal ideation in a real-world setting with benefits comparable to clinical trials.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.003 | 0.010 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".