Electroconvulsive therapy and brain damage

Advances in the practice of electroconvulsive therapy

The first electroconvulsive treatment was administered by Cerletti and Bini in 1938. The event was essentially an experiment, carried out like a military operation (Endler, 1988). The patient was stimulated three times, each time increasing the intensity of the stimulus before a generalised seizure was induced. He had been suffering from an acute psychosis with a poor prognosis, but responded to a course of 11 treatments and was discharged free of symptoms two months later. The first paper on electroconvulsive therapy (ECT) in English was published in theLancet(Kalinowski) in 1939. At that time, somatic treatment alternatives for the severely ill in large mental institutions included lobotomy and insulin coma therapy. In comparison, unmodified ECT (albeit associated with a significant risk of serious physical morbidity) was predictable, efficient, quick and effective. It is understandable why the treatment became widely and fairly indiscriminately adopted before systematic objective evidence of its efficacy was collected.

Diffusion weighted MRI in the early phase after electroconvulsive therapy

Although cognitive side effects may occur after electroconvulsive therapy (ECT), no structural brain abnormalities have been detected after ECT with conventional magnetic resonance imaging (MRI). Transient disturbances of memory function are common findings after ECT indicating functional compromise. Diffusion weighted imaging (DWI) has been shown to be sensitive to focal tissue changes associated with compromise of energy metabolism in cerebral ischemia and after prolonged ictal activity. We used conventional MRI and DWI in an exploratory study examining ten patients after treatment with ECT, eight of whom experienced short-lasting memory disturbances. MRI and DWI showed no definite signal abnormalities on qualitative and quantitative analysis. In three patients, equivocal marginal DWI hyperintensity was noted in the hippocampal formation. These findings are in line with previous negative studies using conventional MRI. Higher resolution DWI and serial imaging may be necessary to visualize possible minimal signal changes after ECT.

Electroconvulsive stimulations prevent stress-induced morphological changes in the hippocampus

Stress can precipitate major depression and other disorders linked to hippocampal shrinkage. It is hypothesized but not established that treatment of these disorders reverses and prevents the hippocampal changes. Dendritic retraction of individual neurons might in concert with other pathophysiological events contribute to the shrinkage phenomenon. Animal studies have shown that various stress paradigms can induce dendritic retraction in the CA3 pyramidal neurons of the hippocampus. Since electroconvulsive treatment is the most effective treatment in humans with major depression, we investigated whether repeated electroconvulsive stimulations (ECSs) could influence such changes in stressed rats. Furthermore, we investigated whether ECSs per se could influence neuronal branching and total length of the CA3 hippocampal neuronal dendritic tree in normal rats. Rats were stressed using the 21-day 6 h daily restraint stress paradigm. The study shows that stress caused remodelling of the pyramidal neurons by significantly reducing the number of dendritic branch points and total length of the apical dendritic tree. Concomitant administration of ECSs prevented these effects. ECSs had no effect on pyramidal neuron dendrites in normal rats.

Electroconvulsive therapy for the depressed elderly

BACKGROUND

Depressive disorder is a common mental disorder in old age, with serious health consequences such as increased morbidity, disability, and mortality. The frailty of elderly may seriously hamper the efficacy and safety of pharmacotherapy in depressed elderly. Electroconvulsive therapy (ECT) in depressed elderly therefore may be an alternative to treatment with antidepressants.

OBJECTIVES

To assess the efficacy and safety of ECT (compared to simulated ECT or antidepressants) in depressed elderly.

SEARCH STRATEGY

We searched the CCDANCTR database, Medline 1966-2000, EMBase 1980-2000, Biological abstracts 1985-2000, Cinahl 1982-2000, Lilacs from 1982 onwards, Psyclit 1887-2000, Sigle 1980-2000. The reference lists of relevant papers were scanned for published reports. Hand searching of the Journal of ECT and the Journal of Geriatric Psychiatry was done. Based on the title of the publication and its abstract, non-eligible citations were excluded.

SELECTION CRITERIA

Data were independently extracted by at least two reviewers. Randomised, controlled trials on depressed elderly (> 60 years) with or without concomitant with conditions like cerebrovascular disease, dementia of the Alzheimer's type, vascular dementia or Parkinson's disease were included.

DATA COLLECTION AND ANALYSIS

Data were independently extracted by at least two reviewers. For continuous data weighted mean differences (WMD) between groups were calculated.

MAIN RESULTS

Randomised evidence is sparse. Only three trials could be included, one on the efficacy of real ECT versus simulated ECT (O'Leary et al 1994), one on the efficacy of unilateral versus bilateral ECT (Fraser 1980) and the other comparing the efficacy of ECT once a week with ECT three times weekly (Kellner 1992). All had major methodological shortcomings; data were mostly lacking essential information to perform a quantitative analysis. Although the O'Leary study concluded that real ECT was superior over simulated ECT, these conclusions need to be interpreted cautiously. Only results from the second trial (unilateral versus bilateral ECT) could be analysed, not convincingly showing efficacy of unilateral ECT over bilateral ECT, WMD 6.06 (CI -5.20,17.32). Randomised evidence on the efficacy and safety of ECT in depressed elderly with concomitant dementia, cerebrovascular disorders or Parkinson's disease is completely lacking. Possible side-effects could not be adequately examined because the lack of randomised evidence and the methodological shortcomings.

REVIEWER'S CONCLUSIONS

None of the objectives of this review could be adequately tested because of the lack of firm, randomised evidence. Given the specific problems in the treatment of depressed elderly, it is of importance to conduct a well designed randomised controlled trial in which the efficacy of ECT is compared to one or more antidepressants.

Subtypes of memory dysfunction associated with ECT: characteristics and neurobiological bases

Electroconvulsive therapy (ECT) is an effective treatment for a variety of psychiatric syndromes. However, one of its adverse secondary effects is neurocognitive dysfunction. The aim of this paper is to review different subtypes of memory dysfunction associated with ECT from a neuropsychological perspective. Declarative memory is clearly impaired after ECT. Immediate memory, however, is broadly preserved. Few studies have addressed procedural and incidental memory. Selective memory is impaired, probably due to the disruption of specific brain regions. Some of the possible neurobiological bases of ECT memory dysfunction are discussed in this paper. Synaptic plasticity, the cerebral neurotransmission system, and cerebral metabolism are examined in relation to the dysfunction and subsequent recovery of each memory subtype.

The use of ECT in intellectual disability

The present survey examines the use of electroconvulsive therapy (ECT) by consultant psychiatrists working with people with intellectual disability in Trent Region, UK, which has a population of 4.7 million people. In the first phase of the study, all consultants in the area were sent a questionnaire to find out how many patients had been given ECT during the previous 5 years. Some 92% of the consultant psychiatrists returned the questionnaires. Eight patients were given a total of 122 ECTs, which is low when compared with the use of ECT by general adult psychiatrists. The second phase of the research involved a study of the individual medical case notes to obtain information about individual indications for ECT, outcome and consent issues. The commonest indication for ECT was depression, and the best response was obtained when the clinical picture was dominated by biological and/or psychotic symptoms.