Protection against ECT’s cognitive side effects?
Dr. van Diermen and colleagues assessed short- and long-term changes in global cognitive functioning in 65 consecutive patients treated with ECT for a major depressive episode by administering the Montreal Cognitive Assessment (MoCA) at baseline, before the third ECT session, and 1 week, 3 months, and 6 months after completing their treatment course.
During ECT, the investigators documented a limited decrease in cognitive functioning at the group level, which rebounded during the 6 months after ECT. But although there was no significant difference between MoCA scores at baseline and 6 months follow-up after ECT in the overall group of study participants, that doesn’t tell the full story. Six months after completing their course of ECT, 18% of patients demonstrated improved cognitive functioning, compared with baseline, but 8% had significantly worse cognitive functioning than pretreatment.
“Saying that ECT has no cognitive effects seems to be somewhat wrong to me. It has cognitive effects for certain people, and it will be interesting to know which people,” Dr. van Diermen said.
In what she termed “a very, very preliminary analysis,” she found that the patients with psychotic or melancholic depression were markedly less likely to have long-term cognitive impairment as defined by a worse MoCA score, compared with baseline, both at 6 months and one or more intermediate time points. Only 1 of 31 patients with psychotic depression fell into that poor cognitive outcome category, as did 4 patients with melancholic depression, compared with 12 patients without psychotic depression and 9 without melancholic depression. This, Dr. van Diermen believes, is the first report of an apparent protective effect of melancholic or psychotic depression against ECT-induced long-term cognitive worsening.
“Replication of our results is definitely necessary in larger patient samples,” she cautioned.
Dr. van Diermen reported having no financial conflicts regarding her presentation.
SOURCE: van Diermen L. ECNP 2020, Session EDU03.