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302 The APA Publishing Textbook of Mood Disorders, Second Edition
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nonsuicidal self-injury (Rootes-Murdy et al. 2019), a syndrome often associated with borderline personality disorder. This finding is congruent with the decreased re sponse rate in adults with borderline personality disorder (Rasmussen 2015).
Safety and Efficacy in the Treatment of Mania
In a prospective study of more than 4,400 U.S. hospitals and 14,000 inpatients diag­nosed with mania secondary to bipolar disorder, 18% of patients were treated with ECT and had significantly shorter lengths of stays and lower health care costs (Patel et al. 2019). In a comprehensive review of 589 patients with acute mania, Mukherjee et al. (1994) reported that ECT was an effective treatment, with more than 80% of pa­tients remitting or showing marked clinical improvement. As with depression, patients in manic states that are more resistant to medication treatment have a lower response to ECT (Mukherjee et al. 1994). Positive clinical predictors of response to ECT include features of anxiety, depressed mood, and agitation as opposed to psychosis with or without mixed manic symptoms (Perugi et al. 2013).
Given the known destabilizing effect of antidepressants on bipolar states (Nivoli et al. 2012), some researchers have supported ECT as the perfect mood stabilizer for both the manic and depressive states of bipolar disorder (Medda et al. 2014b). Yet, as concluded in a review published in 2012 on an algorithm for the treatment of hypo­mania and mania, the data on ECT may be more “experience-based than evidence­based” (Nivoli et al. 2012).
It is unclear which electrode placement is most efficacious in bipolar mania. In a randomized study of 36 patients, bifrontal placement was as effective as bitemporal placement in the treatment of acute mania, with fewer cognitive side effects (Hire­mani et al. 2008). There are also limited data comparing right unilateral ECT with bi­lateral ECT.
Bipolar patients with mixed states have a positive response to ECT (Gruber et al. 2000; Medda et al. 2010; Valentí et al. 2008; Vieta 2005); in one study, bipolar patients with mixed symptoms had a more rapid response and a greater decrease in suicidal ideation than bipolar patients in a depressive episode (Ciapparelli et al. 2001). ECT has also been shown to be effective in delirious mania, defined as the rapid onset of delirium, psychosis, mania, and often catatonic symptoms that may be present in up to 15% of patients with acute mania (Jacobowski et al. 2013). ECT is effective in pa­tients with mania who are pregnant; it may have the advantage of decreasing the risks to both the mother and fetus due to the morbidity of a prolonged manic episode with out the potential teratogenicity of anticonvulsants (Khan et al. 2016; Spodniaková et al. 2015). ECT is also effective in children and adolescents with bipolar disorder, hav ing been used effectively in patients with mania in this population (Hill et al. 1997; Shoirah and Hamoda 2011).
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Safety and Efficacy in the Treatment of Catatonia
Catatonic syndromes are present in approximately 10% of acutely ill psychiatric pa­tients, and mood disorders are the most common cause of catatonia (Taylor and Fink
2003). ECT is very effective in the treatment of catatonia related to a mood disorder, particularly when benzodiazepines are ineffective (Kellner et al. 2020; Luchini et al. 2015; Medda et al. 2015; Unal et al. 2017). ECT is also effective in children with cata-
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tonia (Dhossche and Withane 2019; Grover et al. 2013; Jacob et al. 2014; Puffer et al. 2016; Raffin et al. 2015; Wachtel et al. 2011).
Maximizing Efficacy
Research on the treatment of mood disorders since the 1990s has focused on improv­ing the safety of ECT while maintaining efficacy. ECT is a very effective treatment for mood disorders; however, its efficacy depends on use of modern evidence-based methodology, as described in the following subsection.
Maximizing the Efficacy of ECT While Minimizing Side Effects
Clinicians or researchers agree that ECT is one of the most efficacious treatments for mood disorders. The debate is really around its risks, which are primarily related to cardiovascular and cognitive side effects, versus its benefits. Many of the advance­ments in ECT have centered on maintaining its efficacy while decreasing its potential risks. Cardiovascular side effects are primarily due to the adrenergic surge from the induced seizure, which has been compared to a cardiac stress test. The patient’s heart rate can accelerate from a base rate of 70 beats per minute to 130 beats per minute in a matter of seconds. This risk has been mitigated by carefully prescreening patients, ensuring that anesthesia providers are included on the ECT team, and using cardiovas­cular medications (e.g., β-blockers and calcium channel blockers) during the treatment. The risk is higher in patients with preexisting cardiac conditions, including hyperten sion, coronary artery disease, and arrhythmias (Andrade et al. 2016). However, over­all, the rates of cardiovascular side effects are low, and concerns mainly apply to high­risk individuals, who can be managed with prophylactic cardiac medications during ECT (McDonald et al. 2017).
Cognitive side effects of ECT continue to be a significant concern for patients and a major focus of research, which has investigated both decreasing the energy required to initiate the seizure and using alternative electrode placements that do not directly stimulate areas related to memory and cognition. The development of the brief-pulse bidirectional square-wave ECT device in the mid-1980s was arguably one of the most important developments in ECT technology to date (Nilsen et al. 1986). The brief­pulse device is more efficient in inducing seizures than the original sine-wave device, which allows practitioners to deliver a stimulus using less energy and has resulted in a significant decrease in ECT-associated cognitive side effects. In one study compar ing the sine-wave and brief-pulse devices in a community setting, patients treated with the sine-wave machines had a significant slowing in reaction time both immedi­ately and 6 months after the index course of ECT compared with the brief-pulse group (Sackeim et al. 2007).
Another area of investigation is electrode placement, with the hypothesis that the point of stimulation is related to the degree of cognitive side effects. The original elec­trode placement was a bitemporal placement, in which electrodes are placed above the temples, 3 cm above a line intersecting the outer canthus of the eye and the tragus of the ear. This places the stimulus over the temporal lobes, potentially stimulating
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subcortical structures associated with cognition, including the amygdala and hippo­campus. An alternative placement is the d’Elia placement, in which the electrodes are positioned over the right temple and 2 cm lateral to the vertex, thereby avoiding di rect stimulation of cognitive areas associated with language in the dominant (left) hemisphere (d’Elia and Raotma 1975). Early studies showed that this placement, re ferred to as right unilateral ECT, had fewer cognitive side effects than bitemporal ECT (Sackeim et al. 2007). This strategy was refined with the bifrontal placement of elec trodes over the frontal lobes (Letemendia et al. 1993).
The safety of ECT was further improved in the 1990s by advances in the under­standing of the relationship between the seizure threshold and the efficacy of ECT. Again, this progress was rooted in improved knowledge regarding how the amount of energy used to create a seizure affected the seizure’s impact on patient cognition. Through a series of studies, Harold Sackeim and his colleagues demonstrated that the efficacy of ECT was dependent on the magnitude of the electrical stimulus relative to the seizure threshold (McCall et al. 2000; Sackeim et al. 1993, 2000). These studies de termined the stimulus threshold for each patient by using increasing stimulus doses to identify the minimal amount of energy needed to initiate a seizure. The studies by these researchers demonstrated that right unilateral electrode placement was effec­tive only at 6 times the seizure threshold or higher and that bitemporal placement was most effective at 1.5–2.5 times the threshold. A pivotal study by the Consortium on Research in ECT (CORE) group led by Charles Kellner compared right unilateral ECT at 6 times the seizure threshold with bitemporal and bifrontal ECT at 1.5 times the threshold; the group demonstrated that all three electrode placements had equivalent efficacy and cognitive side effects (Kellner et al. 2010). This study confirmed that elec­trode placement and the seizure threshold were important for both determining the ideal parameters of and personalizing ECT treatment.
A recent development has been in the manipulation of one parameter of the ECT stimulus—the pulse width. The ECT stimulus is a pulse of energy composed of a pulse width (milliseconds), frequency (stimulations per second), and length (measured in seconds). The chronaxie is the amount of energy needed to depolarize a neuron; the most efficient pulse would use less energy to depolarize the neuron and potentially have fewer cognitive side effects. An early test of this hypothesis demonstrated that very short pulse widths, or ultrabrief pulse widths (<0.5 milliseconds), were as effec tive as longer pulse widths in treating depression and were associated with fewer cognitive side effects (Sackeim et al. 2008). The CORE group assessed the efficacy of ultrabrief right unilateral ECT in a vulnerable patient population—older patients with major depressive disorder—in their multisite Prolonging Remission in De­pressed Elderly (PRIDE) study (Kellner et al. 2016a, 2016b; Lisanby et al. 2020). They evaluated the safety and efficacy of this approach in 240 elderly adults (age ≥60 years). In phase 1 of the study, 61.7% of patients remitted (and 70% responded); 10% did not remit and the other 28.3% dropped out. Overall, the changes in cognitive function were mild and the treatments were well tolerated.
Using evidence-based techniques to administer ECT can improve the safety of treating patients with mood disorders. Cognition needs to be monitored carefully be­cause patients can have both anterograde and retrograde memory problems. Tools have been developed for bedside testing to monitor cognition; one recent scale is the Electroconvulsive Therapy Cognitive Assessment (Hermida et al. 2020), which is a
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30-point scale that assesses multiple areas potentially affected by ECT, including at­tention and concentration as well as anterograde and retrograde memory functions. Like the Mini-Mental State Examination and Montreal Cognitive Assessment scales, this assessment can be done at the patient’s bedside by a nurse, but unlike these older scales, it also includes assessment of retrograde memory.
Minimizing Relapse
Most clinicians and researchers in the field of mood disorders recognize that it is im­portant to develop treatments that not only treat the acute episode but also manage relapse, particularly in the 6 months following the index episode. Patients with chronic depression and multiple treatment failures are more likely to relapse, and maintaining euthymia is often a central goal of treatment. The relapse rates in the year following a successful course of ECT are approximately 50%, with most patients re lapsing within 6 months (Jelovac et al. 2013). The rates are higher among patients with psychotic depression and “double depression” (major depressive disorder and dys thymia) (Bourgon and Kellner 2000) and patients whose illness failed to respond to multiple antidepressant trials prior to their successful index session of ECT (Sackeim et al. 1990).
One strategy to manage relapse is to use a protocolized pharmacotherapy regimen with novel antidepressant strategies. Most patients whose illness is considered medi cation resistant have primarily failed to respond to selective serotonin reuptake inhib­itors (SSRIs) and serotonin-norepinephrine reuptake inhibitors (SNRIs). The tricyclic antidepressants (TCAs) and monoamine oxidase inhibitors (MAOIs) are more difficult to use because of to their side-effect profiles and issues with patient compliance. Yet TCAs have been shown to be the most effective antidepressants in preventing relapse after ECT (Jelovac et al. 2013). Lithium has also been shown to be an excellent aug­menting agent with proven efficacy in relapse prevention (Brus et al. 2019), although practitioners may be reluctant to use lithium for maintenance therapy (Atiku et al.
2015).
For most patients, the combination of a TCA with lithium would be a novel treat­ment. An early study showed that the relapse rate in the 6 months following a suc­cessful course of ECT was significantly reduced when the patient was maintained on a combination of lithium and nortriptyline compared with nortriptyline alone or pla cebo, with relapse rates of 39%, 60%, and 84%, respectively (Tew et al. 2007). In a ran­domized controlled trial, the CORE group compared continuation pharmacology using nortriptyline and lithium with continuation ECT in 201 patients who had remit­ted with an acute course of bilateral ECT (Kellner et al. 2006). Approximately half the patients in each group relapsed, and continuation ECT and pharmacotherapy were equivalent in terms of preventing relapse. Continuation ECT was well tolerated, with mild and transient cognitive side effects. A later analysis showed an association of higher relapse rates with increasing medication resistance prior to ECT (Rasmussen et al. 2009).
Phase 2 of the PRIDE study examined continuation ECT after a successful course of ultrabrief right unilateral ECT and showed that tapering ECT helped prevent re­lapse (Kellner et al. 2016a). This study also showed that a combination of venlafaxine and lithium with ECT was more effective in preventing relapse than venlafaxine and
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lithium alone. In clinical practice, the combination of pharmacotherapy and continu­ation ECT is the most common approach and appears to also be the most effective (Youssef and McCall 2014). Given the high risk of relapse, a maintenance strategy that includes tapering ECT after an acute course and starting a novel medication trial, which could include a combination of lithium and a TCA or perhaps an SNRI, would be the most appropriate. For patients who relapse in the 6 months following their acute course, continuation ECT combined with antidepressant medication should be considered.
Innovations in Neuromodulation and ECT
The focus of research has been to maintain the efficacy of ECT while minimizing its cognitive and other side effects. As discussed, previous innovations have included changes in the configuration of the pulse width and placement of the electrodes, as well as limiting the amount of energy used to create the seizure to ensure a therapeu tic seizure while limiting side effects. The research in novel neuromodulation devices has focused on using subconvulsive seizures and limiting the convulsive seizures to areas related to mood and away from neurological structures associated with mem­ory and cognition (e.g., hippocampus and amygdala).
rTMS and VNS use FDA-approved neuromodulation devices that have targeted depression using subconvulsive stimuli. rTMS administers a series of magnetic stim ulations, usually over the left or right dorsolateral prefrontal cortex, to stimulate or depress firing of the underlying neurons. It has been shown to be effective in the treat ment of major depressive disorder (George et al. 2010; O’Reardon et al. 2007). Similar to ECT, rTMS is less effective in patients whose illness has failed to respond to multi ple antidepressant trials and who have chronic depression (Garnaat et al. 2019). ECT has an advantage over rTMS in the most severely ill and psychotic patients because those treated with ECT can begin to show improvement in a few days to a few weeks, whereas those given rTMS may need to wait 4–6 weeks to experience the full benefit. ECT has also been shown to be effective in stimulating subcortical areas known to be involved in depression (e.g., subcortical cingulate), while rTMS stimulates primarily cortical tissue and has only an indirect effect on subcortical areas known to be central to mood disorders. However, recent advances in rTMS technology (see “Transcranial Magnetic Stimulation”) have addressed many of these potential defi­ciencies and include research into shortening the treatment time from weeks to days, targeting more subcortical areas, and improving efficacy in severely depressed pa­tients (McDonald and van Rooij 2019). Continued research in this area will be import­ant; rTMS has distinct advantages over ECT because it has essentially no cognitive or cardiovascular side effects and no need for anesthesia. Some have described rTMS and ECT as complementary and not competitive alternatives for patients with depression, with ECT being clearly more effective in specific populations (e.g., psychotic depres­sion) but the two modalities having considerable overlap in the treatment of other depressed populations (Fitzgerald 2004).
tDCS uses a low-intensity neuromodulation device that is currently in clinical trials. This device uses a positively charged anode electrode and negatively charged cathode electrode positioned on the scalp to excite or inhibit, respectively, cortical neurons un-
Chapter 19,
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derlying membrane potentials. tDCS is very safe and has the potential to be adapted for use by patients in their homes. Early trials have shown positive results in the treat ment of depression, although the results have been relatively modest and show less effectiveness in TRD (Jog et al. 2019).
VNS delivers a subconvulsive stimulus and requires a surgical procedure to attach the device to the vagal nerve. VNS can also take months to be effective, and its clinical application has been slowed by the cost and the fact that the Centers for Medicare and Medicaid Services (CMS) and most insurance carriers have not approved payment for the procedure. However, VNS has been shown to be effective in patients with highly treatment-resistant illness (i.e., failure of eight or more antidepressant medications and nonresponse to ECT) and can produce a durable response over years (Aaronson et al. 2017). CMS is currently funding a study to reevaluate the safety and efficacy of VNS that, if positive, could open the way to increased coverage for this treatment. VNS is Brain Stimulation”).
stimuli is DBS. DBS is both subconvulsive and targeted to a few millimeters of tissue. Early studies found that DBS was effective in patients whose illness was nonrespon­sive to ECT and in those with chronic depression (Bergfeld et al. 2016; Holtzheimer et al. 2012). The efficacy of DBS in large clinical trials has been mixed. Different groups are using different targets and different stimulus parameters with variable results, so more research is needed before DBS can be used clinically. The specificity of DBS, which can target specific white matter bundles in individuals with severe TRD, can provide perhaps the most personalized approach to therapy for chronic depression that is resistant to other treatments, including ECT (Conroy and Holtzheimer 2019).
away from cognitive areas and on neuroanatomical areas associated with depression. Two investigational devices include magnetic stimulation therapy (MST) and focal electrically administered seizure therapy (FEAST). MST relies on the principle that magnetic fields can be used to apply a more focal seizure than an electrical stimulus applied to the scalp because these fields pass unimpeded though the skull to stimu­late a more defined brain area (Deng et al. 2011). The result is more focal stimulation of the cortex and decreased stimulation of areas in the temporal lobes involved in cog nitive processing and memory. Although anesthesia is still required for MST (because the stimulus results in a generalized seizure), preliminary studies have shown it is as effective as ECT but with fewer cognitive side effects (Fitzgerald et al. 2013). Notably, some of the earlier studies have included patients with bipolar depression and psy­chotic depression, although no definitive conclusions can be drawn about the efficacy of MST in these disorders because the studies are preliminary (Kallioniemi et al.
2019). MST has also been shown to be effective in alleviating suicidal ideation (Sun et al. 2016).
generalization of the seizure. The FEAST stimulus is unidirectional and uses novel electrodes and placement that result in increased focality and a more efficient seizure induction (Sahlem et al. 2016; Spellman et al. 2009). The preliminary research, as well as preclinical studies in primates, has demonstrated that FEAST can induce an anti­depressant response with a relatively short time to reorientation (Nahas et al. 2013;
discussed in more detail in Chapter 20 (“Vagus Nerve Stimulation and Deep
One of the most innovative and targeted research approaches to subconvulsive
A second approach has been to use a convulsive stimulus but to focus the stimulus
FEAST uses ECT technology to initiate a seizure in the prefrontal cortex prior to
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Sahlem et al. 2016) and shows a more focal onset of seizure activity in the prefrontal cortex (Chahine et al. 2014).
There are other advanced investigational technologies using neuromodulation procedures that potentially could offer treatment for patients with the most resistant illness; these include closed-loop/adaptive DBS, optogenetics, magnetogenetics, and high- and low-intensity focused ultrasound (Kilian et al. 2019). Continued refinement of these procedures and determination of which patients will be most likely to benefit are important areas of research (McDonald 2019).
Conclusion
ECT is safe and effective in the treatment of TRD, with remission rates ranging from 60% to 80% and half of the patients remaining well over the following 6 months, when the potential for relapse is highest. Technical modifications to improve the safety and tolerability of ECT have included development of individualized dosing strategies, use of electrode placements that minimize direct stimulation of cognitively sensitive neuroanatomical areas, and adjustment of the stimulus parameters. From a medical perspective, these refinements have significantly improved the safety of ECT while maintaining its efficacy in the treatment of affective disorders. Unfortunately, the public perception of ECT continues to lag the research, although many studies show that patients receiving ECT and their families rate the experience favorably (Brown et al. 2018) and that perception is understandably related to the treatment practices of the ECT staff (Chakrabarti et al. 2010; Knight et al. 2017).
There are two clinical areas in which ECT clearly has an advantage over other FDA-approved neuromodulation devices: speed of response and rate of remission in the most severe psychiatric syndromes, including psychotic depression and catato nia. Two other FDA-approved treatments, rTMS and VNS, offer alternatives for some patients, and it is important to identify which populations will benefit from these treatments. Investigational therapies using neuromodulation are providing new treatment options for patients with severe depression who do not respond to ECT.
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