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Baseline cognitive function predicts full remission of suicidal symptoms among patients with treatment-resistant depression and strong suicidal ideation after low-dose ketamine infusion.

Wei-Chen Lin, Tung-Ping Su, Cheng-Ta Li, Hui-Ju Wu, Shih-Jen Tsai, Ya-Mei Bai, Pei-Chi Tu, Mu-Hong Chen

Journal of psychopharmacology (Oxford, England) August 2023 DOI: 10.1177/02698811231182107 (opens in new tab)

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Study at a glance

AI-extracted from the abstract
Characteristics Randomized controlled trial Peer reviewed
Sample size 65
Population Patients with treatment-resistant depression and strong suicidal ideation
Intervention Ketamine
Dose 0.5 mg/kg
Duration Assessments at baseline and postinfusion Days 2, 3, 5, and 7; antisuicidal effect persisted for 1 week
Topics Ketamine Depression Esketamine
Keywords Antisuicidal effect Response inhibition Working memory
Key findings A single 0.5 mg/kg ketamine infusion produced full remission of suicidal symptoms lasting 3 days and an antisuicidal effect lasting 1 week. Lower baseline cognitive impairment, indicated by a higher rate of correct responses on a working memory task, was associated with a rapid and sustained antisuicidal effect.

Abstract

Whether pretreatment working memory and response inhibition function are associated with the rapid and sustained antisuicidal effect of low-dose ketamine among patients with treatment-resistant depression (TRD) and strong suicidal ideation is unclear. We enrolled 65 patients with TRD, comprising 33 who received a single infusion of 0.5 mg/kg ketamine and 32 who received a placebo infusion. The participants performed working memory and go/no-go tasks prior to infusion. We assessed suicidal symptoms at baseline and on postinfusion Days 2, 3, 5, and 7. The full remission of suicidal symptoms persisted for 3 days after a single ketamine infusion and the ketamine-related antisuicidal effect persisted for 1 week. Lower cognitive impairment at baseline (indicated by a higher rate of correct responses on a working memory task) was associated with the rapid and sustained antisuicidal effect of low-dose ketamine in patients with TRD and strong suicidal ideation. Patients with TRD and strong suicidal ideation but low cognitive impairment may benefit the most from the antisuicidal effect of low-dose ketamine.

Comparable studies

Other randomized controlled trials on ketamine for depression, most cited first.

Study Year Design Participants
Antidepressant Efficacy of Ketamine in Treatment-Resistant Major Depression: A Two-Site Randomized Controlled Trial Patients with treatment-resistant major depression experiencing a major depressive episode 2013 Randomized controlled trial n = 73
Efficacy and Safety of Flexibly Dosed Esketamine Nasal Spray Combined With a Newly Initiated Oral Antidepressant in Treatment-Resistant Depression: A Randomized Double-Blind Active-Controlled Study Adults with moderate to severe nonpsychotic depression and a history of nonresponse to... 2019 Phase 3, double-blind, active-controlled, multicenter randomized controlled trial n = 227
Efficacy of Esketamine Nasal Spray Plus Oral Antidepressant Treatment for Relapse Prevention in Patients With Treatment-Resistant Depression Adults with treatment-resistant depression who achieved stable remission or stable... 2019 Phase 3, multicenter, double-blind, randomized withdrawal study n = 297
Efficacy and Safety of Intranasal Esketamine Adjunctive to Oral Antidepressant Therapy in Treatment-Resistant Depression Adults with DSM-IV-TR diagnosis of major depressive disorder and history of inadequate... 2017 Phase 2, double-blind, doubly randomized, delayed-start, placebo-controlled study n = 67
Efficacy and Safety of Intranasal Esketamine for the Rapid Reduction of Symptoms of Depression and Suicidality in Patients at Imminent Risk for Suicide: Results of a Double-Blind, Randomized, Placebo-Controlled Study Depressed patients at imminent risk for suicide 2018 Randomized controlled trial n = 68

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