Sex-specifics of ECT outcome.

OBJECTIVE: Electroconvulsive therapy (ECT) is the most effective treatment for patients with severe major depressive disorder (MDD). Given the known sex differences in MDD, improved knowledge may provide more sex-specific recommendations in clinical guidelines and improve outcome. In the present study we examine sex differences in ECT outcome and its predictors. METHODS: Clinical data from 20 independent sites participating in the Global ECT-MRI Research Collaboration (GEMRIC) were obtained for analysis, totaling 500 patients with MDD (58.6 % women) with a mean age of 54.8 years. Severity of depression before and after ECT was assessed with validated depression scales. Remission was defined as a HAM-D score of 7 points or below after ECT. Variables associated with remission were selected based on literature (i.e. depression severity at baseline, age, duration of index episode, and presence of psychotic symptoms). RESULTS: Remission rates of ECT were independent of sex, 48.0 % in women and 45.7 % in men (X2(1) = 0.2, p = 0.70). In the logistic regression analyses, a shorter index duration was identified as a sex-specific predictor for ECT outcome in women (X2(1) = 7.05, p = 0.01). The corresponding predictive margins did show overlapping confidence intervals for men and women. CONCLUSION: The evidence provided by our study suggests that ECT as a biological treatment for MDD is equally effective in women and men. A shorter duration of index episode was an additional sex- specific predictor for remission in women. Future research should establish whether the confidence intervals for the corresponding predictive margins are overlapping, as we find, or not.

Resting state functional connectivity predictors of treatment response to electroconvulsive therapy in depression.

There is increasing focus on use of resting-state functional connectivity (RSFC) analyses to subtype depression and to predict treatment response. To date, identification of RSFC patterns associated with response to electroconvulsive therapy (ECT) remain limited, and focused on interactions between dorsal prefrontal and regions of the limbic or default-mode networks. Deficits in visual processing are reported in depression, however, RSFC with or within the visual network have not been explored in recent models of depression. Here, we support prior studies showing in a sample of 18 patients with depression that connectivity between dorsal prefrontal and regions of the limbic and default-mode networks serves as a significant predictor. In addition, however, we demonstrate that including visual connectivity measures greatly increases predictive power of the RSFC algorithm (>80% accuracy of remission). These exploratory results encourage further investigation into visual dysfunction in depression, and use of RSFC algorithms incorporating the visual network in prediction of response to both ECT and transcranial magnetic stimulation (TMS), offering a new framework for the development of RSFC-guided TMS interventions in depression.

Focal prefrontal seizures induced by bilateral ECT.

INTRODUCTION: It has been proposed that the greater efficacy of bilateral (BL) over right unilateral (RUL) electroconvulsive therapy (ECT) at low stimulus intensity is due to differences in site of seizure initiation. We hypothesized that focal prefrontal seizures are more common with BL than RUL administration. METHOD: Records were reviewed of the 1,007 ECT treatments of 84 consecutive patients randomized to RUL or BL electrode placement. RESULTS: Eight events were identified in which there was an electroencephalographic seizure without motor manifestation. All of these events occurred at titration sessions and with BL stimuli (p = 0.002). These events were more likely to occur later in the course of treatment. DISCUSSION: We suggest that BL ECT may induce focal seizures in prefrontal areas and that these seizures are more likely to occur later in the treatment course.

Electro-convulsive therapy practices in the community.

BACKGROUND: Controlled studies have demonstrated that variations in electro-convulsive therapy (ECT) technique impacts on efficacy and cognitive side effects. However, there is little information on the extent of variation in how ECT is practiced in community settings in the United States. METHODS: A survey of practice patterns was conducted at ECT facilities in the greater New York City metropolitan area. RESULTS: The 59 facilities varied considerably in many aspects of ECT practice, often clearly departing from the standards in the field. The more intensive the form of ECT used at facilities, the less likely was cognitive status assessed following the treatment course. CONCLUSION: There is marked variability in the nature of ECT practices in community settings. The extent to which this variability impacts on the benefits and risks of ECT needs to be examined.

ECT in bipolar and unipolar depression: differences in speed of response.

OBJECTIVES: There is sparse evidence for differences in response to electroconvulsive therapy (ECT) between patients with bipolar or unipolar major depression, with virtually no information on speed of response. We contrasted a large sample of bipolar (BP) and unipolar (UP) depressed patients in likelihood and rapidity of clinical improvement with ECT. METHODS: Over three double-blind treatment protocols, 228 patients met Research Diagnostic Criteria for UP (n = 162) or BP depression (n = 66). Other than lorazepam PRN (3 mg/day), patients were withdrawn from psychotropics prior to the ECT course and until after post-ECT assessments. Patients were randomized to ECT conditions that differed in electrode placement and stimulus intensity. Symptomatic change was evaluated at least twice weekly by a blinded evaluation team, which also determined treatment length. RESULTS: Patients with BP and UP depression did not differ in rates of response or remission following the ECT course, or in response to unilateral or bilateral ECT. Degree of improvement in Hamilton Rating Scale for Depression scores following completion of ECT was also comparable. However, BP patients received significantly fewer ECT treatments than UP patients, and this effect was especially marked among bipolar ECT responders. Both BP I and BP II patients showed especially rapid response to ECT. CONCLUSIONS: The BP/UP distinction had no predictive value in determining ECT outcome. In contrast, there was a large effect for BP patients to show more rapid clinical improvement and require fewer treatments than unipolar patients. The reasons for this difference are unknown, but could reflect a more rapid build up of anticonvulsant effects in BP patients.

Continuation pharmacotherapy in the prevention of relapse following electroconvulsive therapy: a randomized controlled trial.

CONTEXT: Electroconvulsive therapy (ECT) is highly effective for treatment of major depression, but naturalistic studies show a high rate of relapse after discontinuation of ECT. OBJECTIVE: To determine the efficacy of continuation pharmacotherapy with nortriptyline hydrochloride or combination nortriptyline and lithium carbonate in preventing post-ECT relapse. DESIGN: Randomized, double-blind, placebo-controlled trial conducted from 1993 to 1998, stratified by medication resistance or presence of psychotic depression in the index episode. SETTING: Two university-based hospitals and 1 private psychiatric hospital. PATIENTS: Of 290 patients with unipolar major depression recruited through clinical referral who completed an open ECT treatment phase, 159 patients met remitter criteria; 84 remitting patients were eligible and agreed to participate in the continuation study. INTERVENTIONS: Patients were randomly assigned to receive continuation treatment for 24 weeks with placebo (n = 29), nortriptyline (target steady-state level, 75-125 ng/mL) (n = 27), or combination nortriptyline and lithium (target steady-state level, 0.5-0.9 mEq/L) (n = 28). MAIN OUTCOME MEASURE: Relapse of major depressive episode, compared among the 3 continuation groups. RESULTS: Nortriptyline-lithium combination therapy had a marked advantage in time to relapse, superior to both placebo and nortriptyline alone. Over the 24-week trial, the relapse rate for placebo was 84% (95% confidence interval [CI], 70%-99%); for nortriptyline, 60% (95% CI, 41%-79%); and for nortriptyline-lithium, 39% (95% CI, 19%-59%). All but 1 instance of relapse with nortriptyline-lithium occurred within 5 weeks of ECT termination, while relapse continued throughout treatment with placebo or nortriptyline alone. Medication-resistant patients, female patients, and those with more severe depressive symptoms following ECT had more rapid relapse. CONCLUSIONS: Our study indicates that without active treatment, virtually all remitted patients relapse within 6 months of stopping ECT. Monotherapy with nortriptyline has limited efficacy. The combination of nortriptyline and lithium is more effective, but the relapse rate is still high, particularly during the first month of continuation therapy.

Quantitative EEG during seizures induced by electroconvulsive therapy: relations to treatment modality and clinical features. I. Global analyses.

This study examined the effects of electroconvulsive therapy (ECT) treatment conditions, patient individual difference factors, and clinical outcome on global electroencephalogram (EEG) power during and immediately following ECT-induced seizures. Sixty-two patients were randomized to ECT conditions differing in electrode placement (right unilateral versus bilateral) and stimulus dosage (just above seizure threshold versus 2.5 times seizure threshold). At the second and penultimate treatments, global total power (1.5-28.5 Hz) and global power in specific frequency bands were quantified in 19-lead EEG recordings of the generalized seizure and the immediate postictal period. Seizures induced with high dosage, and to lesser extent, with bilateral electrode placement, resulted in greater global power. Patient age, initial seizure threshold, and baseline depression severity were inversely related to global power during seizures. While superior clinical outcome following ECT was associated with greater global power during seizures, this effect was small. The factors associated with more robust seizure expression also resulted in greater postictal bioelectric suppression. Associations with treatment parameters and patient variables were stronger at the second than penultimate treatment. We conclude that manipulations of ECT technique strongly determine the magnitude of seizure expression, but relations with clinical outcome are weak. The findings raise doubt about the clinical utility of algorithms based on analysis of EEG features to guide ECT parameter selection.

Quantitative EEG during seizures induced by electroconvulsive therapy: relations to treatment modality and clinical features. II. Topographic analyses.

This study tested three alternative theories of the mechanisms of therapeutic action of electroconvulsive therapy (ECT). The theories differed in predictions about the global and topographic effects of effective and ineffective forms of ECT on electroencephalogram (EEG) seizure expression. At the second treatment, 19-lead EEG recordings were obtained in 57 depressed patients randomized to conditions that differed in ECT electrode placement and stimulus dosage. Power in the delta frequency band was quantified during the seizure and analyzed with traditional multivariate methods and the Scaled Subprofile Model. Electrical dosage of the ECT stimulus had a powerful effect on ictal global delta power and, more so, than electrode placement. Greater ictal global delta power was associated with superior therapeutic outcome, but the magnitude of this effect was small. Effective forms of ECT resulted in a topography where delta power was accentuated in prefrontal EEG sites. High dosage right unilateral ECT also resulted in stronger asymmetry in prefrontal regions than the ineffective, low dosage right unilateral ECT. Greater bilateral generalization of seizure expression does not appear to be a prerequisite for therapeutic effects. Instead, more intense seizure expression in prefrontal regions may be critical for efficacy.

The effects of electroconvulsive therapy on memory of autobiographical and public events.

BACKGROUND: Retrograde amnesia is the most persistent cognitive adverse effect of electroconvulsive therapy (ECT); however, it is not known whether ECT has differential effects on autobiographical vs impersonal memories. This study examined the short- and long-term effects of differing forms of ECT on memory of personal and impersonal (public) events. METHODS: Fifty-five patients with major depression were randomly assigned to right unilateral (RUL) or bilateral (BL) ECT, each at either low or high electrical dosage. The Personal and Impersonal Memory Test was administered by blinded raters at baseline, during the week after ECT, and at the 2-month follow-up. Normal controls were tested at matched intervals. RESULTS: Shortly after ECT, patients recalled fewer events and event details than controls, with the deficits most marked for impersonal compared with personal events. Bilateral ECT caused more marked amnesia for events and details than RUL ECT, and especially for impersonal memories. These effects were independent of electrical dosage and clinical outcome. At the 2-month follow-up, patients had reduced retrograde amnesia, but continued to show deficits in recalling the occurrence of impersonal events and the details of recent impersonal events. CONCLUSIONS: The amnestic effects of ECT are greatest and most persistent for knowledge about the world (impersonal memory,) compared with knowledge about the self (personal memory), for recent compared with distinctly remote events, and for less salient events. Bilateral ECT produces more profound amnestic effects than RUL ECT, particularly for memory of impersonal events.

Electrophysiological correlates of the adverse cognitive effects of electroconvulsive therapy.

Resting state, eyes closed, 19-lead EEG recordings were obtained at pre-ECT baseline and just prior to penultimate treatment and during the week following the ECT course in 59 patients with major depression. Patients had been randomized to ECT conditions that varied in electrode placement and stimulus intensity. The EEG data were submitted to power spectral analysis, and global and topographic effects were characterized for the delta and theta frequency bands. Relations between the EEG changes and scores on three cognitive measures were examined. The period of disorientation immediately following RUL ECT was associated with an accentuation of delta power in anterior frontal and temporal regions. Across the electrode placements, increased theta activity in left frontotemporal regions was associated with longer recovery of orientation. Post-ECT decrements in global cognitive status, as assessed by the modified Mini-Mental State exam, were associated with a greater increase in delta relative to theta power, globally across the cortex. The magnitude of retrograde amnesia for autobiographical events correlated with increased theta activity in left frontotemporal regions. The findings suggest that distinct neurophysiological changes subserve the therapeutic and adverse cognitive effects of ECT. Postictal disorientation and post-ECT retrograde amnesia appear to share a common physiological substrate.

Subjective memory complaints: a review of patient self-assessment of memory after electroconvulsive therapy.

Interest in patients' subjective complaints about the adverse cognitive effects of electroconvulsive therapy (ECT) spans several decades. This article reviews the major areas that have been examined in relation to patients' subjective assessment of memory function: 1) technical aspects in the administration of ECT; 2) objective tests of cognitive function; and 3) clinical state. For the most part, subjective assessments of memory following ECT have relied on a single instrument, the Squire Subjective Memory Questionnaire (SSMQ). While older reports of the impact of the technical aspects of ECT on subjective memory assessment following ECT suggest a detectable negative influence with certain forms of treatment, most recent studies indicate that subjective memory improves following ECT. This shift in findings may be due to the change in practice from sine wave to brief-pulse ECT. While the impact of ECT on objective tests of memory is clear and reproducible, the relationship of objective findings to subjective memory assessment appears to be weak. Instead, subjective reports of cognitive function are strongly influenced by mood state. Current batteries of objective tests of memory may not include components that are most affected in reports about subjective memory. In addition, the literature mainly reports group effects, and sample sizes have been small. We lack data on the number of individuals who believe ECT has had a markedly negative effect on memory functioning, and on the characteristics of memory function in this subgroup of patients who complain of severe impairment. Furthermore, there is a paucity of information relating patient characteristics to subjective memory outcomes with ECT.

A prospective, randomized, double-blind comparison of bilateral and right unilateral electroconvulsive therapy at different stimulus intensities.

BACKGROUND: Controversy persists about the use of right unilateral (RUL) and bilateral (BL) electroconvulsive therapy (ECT). While RUL ECT results in less severe short-term and long-term cognitive effects, there is concern that it is less efficacious than BL ECT. METHODS: In a double-blind study, 80 depressed patients were randomized to RULECT, with electrical dosages 50%, 150%, or 500% above the seizure threshold, or BL ECT, with an electrical dosage 150% above the threshold. Depression severity and cognitive functioning were assessed before, during, immediately after, and 2 months after ECT. Compared with baseline, responders had at least a 60% reduction in symptom scores 1 week after ECT, and were monitored for relapse for 1 year. RESULTS: High-dosage RUL and BL ECT were equivalent in response rate (65%) and approximately twice as effective as low-dosage (35%) or moderate-dosage (30%) unilateral ECT. During the week after the randomized phase, BL ECT resulted in greater impairment than any dosage of unilateral ECT in several measures of anterograde and retrograde memory. Two months after ECT, retrograde amnestic deficits were greatest among patients treated with BL ECT. Thirty-three (53%) of the 62 patients who responded to ECT relapsed, without treatment group differences. The relapse rate was greater in patients who had not responded to adequate pharmacotherapy prior to ECT and who had more severe depressive symptoms after ECT. CONCLUSION: Right unilateral ECT at high dosage is as effective as a robust form of BL ECT, but produces less severe and persistent cognitive effects.

Determinants of seizure threshold in ECT: benzodiazepine use, anesthetic dosage, and other factors.

The electrical dosage of the ECT stimulus impacts on efficacy and cognitive side effects, yet seizure threshold (ST) may vary as much as 50-fold across patients. It would be desirable to predict ST on the basis of patient and treatment characteristics. In particular, concerns have been raised that benzodiazepine use and higher dosage of barbiturate anesthetics elevate ST. In a three-site study, ST was quantified at the first ECT session using an identical empirical titration procedure in 294 patients who met RDC and DSM-IIIR criteria for a major depressive episode. ST varied over a 35-fold range across patients treated with right unilateral (RUL) (n = 267) and bilateral (BL) (n = 27) ECT. Higher ST was associated with BL electrode placement (p = 0.001). Among patients treated with RUL ECT, univariate analyses indicated that higher ST was associated with advanced age (p < 0.001), male gender (p < 0.001), greater burden of medical illness (p < 0.001), weight (p < 0.01), duration of mood disorder (p < 0.01), and history of previous ECT (p < 0.05). Average lorazepam dose in the 48 hours prior to ECT was not associated with ST, but was associated with decreased seizure duration (p < 0.01). Absolute, but not weight-adjusted, methohexital dose was associated with ST (p < 0.01). Multivariate analyses in patients treated with unilateral ECT showed that only 27.6% of the variance in ST (p < 0.0001) could be predicted. In the multivariate analyses, only age (p = 0.0001), gender (p = 0.01), and methohexital dose (p = 0.0001) were independently related to ST. Low dosage of lorazepam and methohexital dosage below 1 mg/kg are unlikely to impact on ST. Given the limited capacity to predict ST, empirical titration remains the only accurate method to determine electrical dosage in RUL ECT.

Learning and memory in bipolar and unipolar major depression: effects of aging.

OBJECTIVE: The goal of this study was to examine the effects of aging on neuropsychological functions in bipolar and unipolar major depression. BACKGROUND: Earlier studies suggested that neurocognitive deficits in mood disorder patients correlate with duration and severity of illness and also that bipolar disorder has a more virulent course than unipolar disorder. We hypothesized that elderly patients with bipolar disorder will demonstrate greater neurocognitive dysfunction than young patients with bipolar disorder and elderly patients with unipolar disorder. METHOD: A battery of tests of general intelligence and learning and memory was administered to 79 inpatients with major depression referred for electroconvulsive therapy. With patients 60 years of age and older defined as elderly, there were 29 young and 24 elderly unipolar patients and 13 young and 13 elderly bipolar patients. RESULTS: Unipolar and bipolar patients did not differ in measures of general intelligence or global cognitive status. Generally, across tests of memory, young bipolar patients exhibited the best performance and elderly bipolar patients exhibited the poorest performance. CONCLUSIONS: The results suggest that over the course of their illness, patients with bipolar disorder experience greater deterioration in memory functions than patients with unipolar disorder. Longitudinal studies are required to support the preliminary findings of this cross-sectional study.

Acute efficacy of ECT in the treatment of major depression in the old-old.

OBJECTIVE: There are few data addressing the outcome of ECT for persons over 75 years of age. In a prospective, multisite study, the authors compared characteristics and treatment outcomes of adult (59 and younger), young-old (60 to 74 years), and old-old (75 and older) patients treated with ECT for major depression. METHOD: At four hospitals, 268 patients with primary unipolar major depression and scores of at least 20 on the 24-item Hamilton Depression Rating Scale were treated with suprathreshold right unilateral or bilateral ECT in a standardized manner. Demographic variables, clinical characteristics, and short-term outcomes of the three groups were compared. RESULTS: The demographic and clinical characteristics of the old-old patients were similar to those of the young-old patients, whereas both groups differed from the adult patients on these variables. Both older groups had significantly greater burdens from physical illness and global cognitive impairment at baseline than the adult subjects. Both older groups had shorter index depressive episodes and were less likely to have had inadequate responses to adequate medication trials before ECT. The older groups had higher seizure thresholds, but the three groups received similar courses of treatment. The adult patients experienced a significantly lower rate of ECT response (54%) than the young-old patients (73%), while the old-old patients had an intermediate rate of response (67%). CONCLUSIONS: Despite a higher level of physical illness and cognitive impairment, even the oldest patients with severe major depression tolerate ECT in a manner similar to that for younger patients and demonstrate similar or better acute response.

Naloxone in the prevention of the adverse cognitive effects of ECT: a within-subject, placebo controlled study.

Electroconvulsive therapy (ECT) is a highly effective treatment for major depression, but is also associated with characteristic cognitive side effects. Several reports document that endogenous opioids and their receptors are activated by electroconvulsive shock (ECS) and that naloxone in doses sufficient to block endogenous opioid receptors may reverse ECS-induced retrograde amnesia. This placebo-controlled, randomized, within-patient study was conducted to examine the potential of naloxone, given in doses sufficient to block opioid receptors (high dose), to ameliorate acute anterograde and retrograde memory impairments following ECT. Compared to placebo and low dose naloxone, high dose naloxone administered immediately before ECT resulted in significant reductions in anterograde amnesia, and better performance on an attention task. Both low and high dose naloxone improved verbal fluency. There were no beneficial effects of high dose naloxone on retrograde amnesia, and an indication that high dose naloxone may have worsened retrograde amnesia for shape stimuli. There were no effects of high dose naloxone on seizure duration, vital signs, and subjective side effects. The study is consistent with prior research in which change in behavioral and physiological measures was produced principally by naloxone doses sufficient to block endogenous opioid receptors and offers evidence of the potential for ameliorating some adverse cognitive effects associated with ECT.

Electroconvulsive therapy and suicide risk.

For major psychiatric disorders in which suicidality is often a symptom, electroconvulsive therapy (ECT) is an established, highly effective treatment. In fact, suicidal risk may be an indication for the use of ECT to treat those disorders. The authors present new data and review clinical experience that indicate that ECT often exerts a profound short-term beneficial effect on suicidality. Little, if any, evidence supports a long-term positive effect of ECT on suicide rates, especially if diagnostically heterogeneous groups are considered. However, patients may have been assigned ECT precisely because they were suicidal and, hence, these reports may represent underestimates. As a whole, the published reports are weakened by methodological shortcomings, such as lack of controls, weak design, and possible cohort effects. In fact, most studies were designed to examine the impact of ECT on mortality rates in general, and all but one study found reductions in overall mortality, the source of which remains undetermined.

Prolactin response to electroconvulsive therapy: effects of electrode placement and stimulus dosage.

BACKGROUND: It is unclear whether the serum prolactin (PRL) surge following electroconvulsive therapy (ECT) is a marker of optimal ECT administration. We investigated the relations among PRL surge, stimulus parameters, and outcome in major depressive disorder (MDD). METHODS: Seventy-nine patients with MDD were randomized in a double-blind trial to right unilateral (RUL) or bilateral (BL), and to low-dose (just above seizure threshold) or high-dose (2.5 x threshold) ECT. RESULTS: Change in PRL (delta PRL) varied among treatment groups, with significant effects of electrode placement (BL > RUL, p < .006), electrical dosage (high > low, p < .04), and gender (female > male, p < .005). There was no evidence that clinical improvement was associated with greater PRL surge. CONCLUSIONS: Although delta PRL varied with parameters impacting on response rates, these data indicate the PRL surge cannot serve as a useful index of clinically effective treatment. This finding does not support the view that diencephalic seizure propagation is necessary for ECT to exert therapeutic effects.

Low use of neuroleptic drugs in the treatment of psychotic major depression.

OBJECTIVE: The adequacy of pharmacologic treatment received by patients with psychotic major depression was evaluated. METHOD: The authors systematically assessed the pharmacotherapy received by 187 depressed patients before initiation of ECT and compared the medication trials of those with psychotic (N = 53) and nonpsychotic (N = 134) depression. RESULTS: Despite a median of four medication trials and median index episode duration of 20 weeks, only two (4%) of the patients with psychotic depression received at least one adequate pharmacotherapy trial. In contrast, 70 (52%) of the patients with nonpsychotic depression received at least one adequate trial. Twenty-five (47%) of the patients with psychotic depression received either no neuroleptic treatment (N = 11) or treatment for less than 3 weeks (N = 14). Only eight (15%) received a daily neuroleptic dose higher than 200 mg of chlorpromazine equivalents. CONCLUSIONS: These findings suggest that many patients with psychotic major depression referred for ECT receive inadequate pharmacotherapy because of either the absence or the inadequate use of neuroleptic medication.