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Method: Thirty-three subjects with DSM-IV-diagnosed MDD received a single open-label infusion of ketamine (0.5 mg/kg) and were rated at baseline and at 40, 80, 120, and 230 minutes postinfusion with the Scale for Suicide Ideation (SSI), the Montgomery-Åsberg Depression Rating Scale, the Hamilton Depression Rating Scale, and the Beck Depression Inventory.

Results: Suicidal ideation scores decreased significantly on the SSI as well as on the suicide subscales of other rating instruments within 40 minutes; these decreases remained significant through the first 4 hours postinfusion (P < .001). Ten subjects (30%) had an SSI score ≥ 4 at baseline; all these scores dropped below 4 (9 dropped by 40 minutes and 1 by 80 minutes). For those patients with a starting score below 4 on the SSI, only 1 reached a score of 4. Depression, anxiety, and hopelessness were significantly improved at all time points (P < .001). Conclusions: Suicidal ideation in the context of MDD improved within 40 minutes of a ketamine infusion and remained improved for up to 4 hours postinfusion.

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