Ketamine versus ECT for Nonpsychotic Treatment-Resistant Major Depression

Amit Anand, Sanjay J. Mathew, Gerard Sanacora, James W. Murrough, Fernando S. Goes, Murat Altinay, Amy S. Aloysi, Ali A. Asghar-Ali, Brian S. Barnett, Lee C. Chang, Katherine A. Collins, Sara Costi, Sidra Iqbal, Manish K. Jha, Kamini Krishnan, Donald A. Malone, Sina Nikayin, Steven E. Nissen, Robert B. Ostroff, Irving M. RetiSamuel T. Wilkinson, Kathy Wolski, Bo Hu

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


BACKGROUND Electroconvulsive therapy (ECT) and subanesthetic intravenous ketamine are both currently used for treatment-resistant major depression, but the comparative effectiveness of the two treatments remains uncertain. METHODS We conducted an open-label, randomized, noninferiority trial involving patients referred to ECT clinics for treatment-resistant major depression. Patients with treatment-resistant major depression without psychosis were recruited and assigned in a 1:1 ratio to receive ketamine or ECT. During an initial 3-week treatment phase, patients received either ECT three times per week or ketamine (0.5 mg per kilogram of body weight over 40 minutes) twice per week. The primary outcome was a response to treatment (i.e., a decrease of ≥50% from baseline in the score on the 16-item Quick Inventory of Depressive Symptomatology.Self-Report; scores range from 0 to 27, with higher scores indicating greater depression). The noninferiority margin was .10 percentage points. Secondary outcomes included scores on memory tests and patient-reported quality of life. After the initial treatment phase, the patients who had a response were followed over a 6-month period. RESULTS A total of 403 patients underwent randomization at five clinical sites; 200 patients were assigned to the ketamine group and 203 to the ECT group. After 38 patients had withdrawn before initiation of the assigned treatment, ketamine was administered to 195 patients and ECT to 170 patients. A total of 55.4% of the patients in the ketamine group and 41.2% of those in the ECT group had a response (difference, 14.2 percentage points; 95% confidence interval, 3.9 to 24.2; P<0.001 for the noninferiority of ketamine to ECT). ECT appeared to be associated with a decrease in memory recall after 3 weeks of treatment (mean [±SE] decrease in the T-score for delayed recall on the Hopkins Verbal Learning Test.Revised, .0.9±1.1 in the ketamine group vs. .9.7±1.2 in the ECT group; scores range from .300 to 200, with higher scores indicating better function) with gradual recovery during followup. Improvement in patient-reported quality-of-life was similar in the two trial groups. ECT was associated with musculoskeletal adverse effects, whereas ketamine was associated with dissociation. CONCLUSIONS Ketamine was noninferior to ECT as therapy for treatment-resistant major depression without psychosis.

Original languageEnglish
Pages (from-to)2315-2325
Number of pages11
JournalNew England Journal of Medicine
Issue number25
StatePublished - 2023


  • Clinical Medicine
  • Clinical Medicine General
  • Depression
  • Psychiatry


Dive into the research topics of 'Ketamine versus ECT for Nonpsychotic Treatment-Resistant Major Depression'. Together they form a unique fingerprint.

Cite this