Whole-Brain Functional Connectivity Dynamics Associated With Electroconvulsive Therapy Treatment Response

BACKGROUND

Depressive episodes (DEPs), characterized by abnormalities in cognitive functions and mood, are a leading cause of disability. Electroconvulsive therapy (ECT), which involves a brief electrical stimulation of the anesthetized brain, is one of the most effective treatments used in patients with DEP due to its rapid efficacy.

METHODS

In this work, we investigated how dynamic brain functional connectivity responds to ECT and whether the dynamic responses are associated with treatment outcomes and side effects in patients. We applied a fully automated independent component analysis-based pipeline to 110 patients with DEP (including diagnosis of unipolar depression or bipolar depression) and 60 healthy control subjects. The dynamic functional connectivity was analyzed by a combination of the sliding window approach and clustering analysis.

RESULTS

Five recurring connectivity states were identified, and patients with DEPs had fewer occurrences in one brain state (state 1) with strong positive and negative connectivity. Patients with DEP changed the occupancy of two states (states 3 and 4) after ECT, resulting in significantly different occurrences of one additional state (state 3) compared with healthy control subjects. We further found that patients with DEP had diminished global metastate dynamism, two of which recovered to normal after ECT. The changes in dynamic connectivity characteristics were associated with the changes in memory recall and Hamilton Depression Rating Scale of DEP after ECT.

CONCLUSIONS

These converging results extend current findings on subcortical-cortical dysfunction and dysrhythmia in DEP and demonstrate that ECT might cause remodeling of brain functional dynamics that enhance the neuroplasticity of the diseased brain.

A second independent audit of electroconvulsive therapy in England, 2019: Usage, demographics, consent, and adherence to guidelines and legislation

OBJECTIVES

To assess progress towards improving the administering of electroconvulsive therapy (ECT) in England since an audit covering 2011, 2013, and 2015. The same information was gathered, for 2019, on usage, demographics, consent, and adherence to national guidelines and the Mental Health Act.

DESIGN AND METHODS

Freedom of Information Act requests were sent to 56 National Health Service Trusts.

RESULTS

Thirty-seven trusts (66%) provided data. The gradual decline in the use of ECT in England has levelled off at about 2,500 people per year. There was a 47-fold difference between the Trusts with the highest and lowest rates per capita. Most recipients are still women (67%) and over 60 (58%). Only one Trust could report how many people received psychological therapy prior to ECT, as required by government (NICE) guidelines. More than a third of ECT (37%) is still given without consent, with 18% of Trusts non-compliant with legislation concerning second opinions. There were slight declines, compared to a previous audit, in the use of standardized depression scales, down to 30%, and standardized measures of cognitive dysfunction, down to 24%. Only six Trusts provided any data for positive outcomes and seven for adverse effects. None provided data on efficacy or adverse effects beyond the end of treatment. Twelve Trusts used identical sentences to each other, verbatim, in response to one or more questions.

CONCLUSIONS

Given the apparent failure of current monitoring and accrediting of ECT clinics in England, by the Royal College of Psychiatrists' ECT Accreditation Service (ECTAS), an independent government sponsored review is urgently needed.

PRACTITIONER POINTS

Psychologists and other mental health staff should ensure that people are offered evidence-based psychological treatments before being offered E.C.T. All staff should ensure that patients are fully informed of the high risk of memory loss and the smaller risk of cardiovascular failure and mortality. Individuals receiving ECT should be closely monitored for adverse cognitive effects, and treatment immediately terminated if these become apparent. Because of increased risk of memory loss for women and older people, the use of ECT should be kept to a minimum and avoided where possible, with these two groups.

Electroconvulsive Therapy for Depression: A Review of the Quality of ECT versus Sham ECT Trials and Meta-Analyses

Background

Electroconvulsive therapy (ECT) is still being administered to approximately a million people annually. There have been no ECT versus simulated ECT (SECT) studies since 1985. The five meta-analyses of ECT versus SECT studies all claim that ECT is more effective than SECT for its primary target, severe depression. This review assesses the quality of those meta-analyses and of the 11 studies on which they are based.

Methods

The meta-analyses were evaluated primarily in terms of whether they considered the quality of the studies they included, but also in terms of whether they addressed efficacy beyond end of treatment. The methodological rigor of the 11 studies included by one or more of the meta-analyses was assessed using a 24-point Quality scale developed for this review.

Results

The five meta-analyses include between 1 and 7 of the 11 studies. The meta-analyses pay little or no attention to the multiple limitations of the studies they include. The 11 studies have a mean Quality score of 12.3 out of 24. Eight scored 13 or less. Only four studies describe their processes of randomization and testing the blinding. None convincingly demonstrate that they are double-blind. Five selectively report their findings. Only four report any ratings by patients. None assess Quality of Life. The studies are small, involving an average of 37 people. Four of the 11 found ECT significantly superior to SECT at the end of treatment, five found no significant difference and two found mixed results (including one where the psychiatrists reported a difference but patients did not). Only two higher Quality studies report follow-up data, one produced a near-zero effect size (.065) in the direction of ECT, and the other a small effect size (.299) in favor of SECT.

Conclusions

The quality of most SECT–ECT studies is so poor that the meta-analyses were wrong to conclude anything about efficacy, either during or beyond the treatment period. There is no evidence that ECT is effective for its target demographic—older women, or its target diagnostic group—severely depressed people, or for suicidal people, people who have unsuccessfully tried other treatments first, involuntary patients, or children and adolescents. Given the high risk of permanent memory loss and the small mortality risk, this longstanding failure to determine whether or not ECT works means that its use should be immediately suspended until a series of well designed, randomized, placebo-controlled studies have investigated whether there really are any significant benefits against which the proven significant risks can be weighed.