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Young patient with treatment-resistant schizophrenia drastically improved by combination of clozapine and maintenance electroconvulsive therapy: a case report

Authors Ito M, Kunii Y, Horikoshi S, Miura I, Itagaki S, Shiga T, Yabe H

Received 13 December 2018

Accepted for publication 3 April 2019

Published 21 June 2019 Volume 2019:12 Pages 185—188


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Taro Kishi

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Masashi Ito,1 Yasuto Kunii,1,2 Sho Horikoshi,1 Itaru Miura,1 Shuntaro Itagaki,1 Tetsuya Shiga,1 Hirooki Yabe1

1Department of Neuropsychiatry, Fukushima Medical University School of Medicine, Fukushima, Japan; 2Department of Neuropsychiatry, Fukushima Medical University School of Aizu Medical Center, Fukushima, Japan

Objectives: Although clozapine is considered the only effective pharmacological option for patients with treatment-resistant schizophrenia (TRS), around 30–40% of patients show clozapine resistance. Modified electroconvulsive therapy augmentation is reportedly clinically effective for clozapine-resistant schizophrenia, but few case reports have described the efficacy of combining clozapine and continuous/maintenance ECT for patients with TRS.
Methods: We present the case of a young patient with TRS who was treated using combination therapy with clozapine and maintenance ECT (m-ECT).
Results: The patient achieved drastic improvement under combination therapy with clozapine and m-ECT. Total Positive and Negative Syndrome Scale (PANSS) score fell markedly by 36 (from 108 to 72) using the combination of clozapine and m-ECT. Behaviors not reflected directly by PANSS score also improved. For example, the problem of being unable to take oral drugs stably because of delusions of poisoning was resolved. Furthermore, the patient maintained improvement under m-ECT, and long-term homestays became possible.
Conclusion: Combination therapy with clozapine and m-ECT proved greatly effective in this case. Further clinical trials of this combination therapy for TRS are needed to confirm the effectiveness. Further studies are also expected to examine effective periods for this therapy.

Keywords: treatment-resistant schizophrenia (TRS), modified electroconvulsive therapy, augmentation, clozapine, maintenance ECT(m-ECT)


Although early intervention can shorten the duration of untreated psychosis, and atypical antipsychotics or psychosocial approaches have been developed and widely adopted, about 30% of all patients with schizophrenia are considered antipsychotic-resistant.13 Clozapine is the most efficacious antipsychotic for patients with treatment-resistant schizophrenia (TRS), but shows several severe side effects, including agranulocytosis. Moreover, around 30–40% of patients with TRS are also clozapine-resistant.46 For clozapine-resistant schizophrenia, modified electroconvulsive therapy, atypical antipsychotics and antiepileptics (or mood stabilizers) have been tried as augmentation therapies. In particular, previous studies have reported that ECT augmentation shows the most favorable response.611 Generally, continuous ECT (c-ECT) is initiated only after remission from acute-phase m-ECT, which lasts up to 6 months, to prevent relapse. On the other hand, m-ECT is a course that begins after the end of c-ECT and is planned to prevent recurrence of an episode.12 Only one RCT study (n=45)9 listed on PubMed examined the utility of continuous or maintenance ECT, and treatment combining neuroleptics and c-ECT appeared more effective for preventing relapse than the use of either therapy alone. Relapse rates within 6 months were 40% (for combined c-ECT and neuroleptics), 93% (for c-ECT alone), and 93% (for neuroleptics alone), respectively.9 However, the neuroleptic used in that RCT was flupenthixol, and no RCT appears to have reported the effectiveness of combining clozapine and c-ECT/m-ECT.

We report herein the case of a young patient with TRS who was treated using a combination of clozapine and m-ECT and achieved drastic improvements.

Case report

The patient was a young man in his early twenties with TRS, who was admitted to the inpatient psychiatry unit at our hospital. He was diagnosed with schizophrenia after he had developed dysmorphophobia, auditory hallucinations, and persecutory delusions. Although he had been treated with several atypical antipsychotics, the response had been poor and psychotic symptoms worsened. In February 2014, he was admitted to a psychiatric hospital with acute psychotic symptoms, such as hallucinations and delusions. After hospitalization for half a year, his symptoms improved temporarily, and he was able to attend a psychiatric day care program. However, he developed delusions, and auditory hallucinations again, and his thinking became incoherent. Many atypical antipsychotics had been used to improve psychotic symptoms, but had not achieved substantial improvement, while neck dystonia had appeared. After this insufficient antipsychotic treatment, TRS was diagnosed based on the poor response to more than two kinds of atypical antipsychotics, and he was then referred to our hospital for administration of clozapine.


The clinical course after admission is shown in Figure 1. During initial admission, although olanzapine (up to 20 mg/day), low-dose quetiapine (100 mg/day), and aripiprazole (up to 30 mg/day) were used before clozapine administration, responses to these antipsychotics were poor (Figure 1). We then administered clozapine and increased the dose to 600 mg/day after carefully decreasing the previous drugs, and added lamotrigine (up to 200 mg/day) as augmentation therapy for clozapine but its efficacy was limited and psychotic symptoms repeated with frequent exacerbations. To make matters worse, oral intake of drugs was difficult due to delusions of poisoning. We therefore decided to try augmentation therapy for further improvement and conducted ECT twice a week for 4 weeks, performing a total of eight sessions.

Figure 1 Course of treatment and changes in PANSS score. Hospital day 0 represents the day of admission. Total PANSS score which decreased by the dosage of clozapine rises again, but decreases again by performing acute ECT. Similarly, continuous ECT and maintenance ECT reduce total PANSS score which became the upward trend again later each. Abbreviations: OLZ, olanzapine; QTP, quetiapine; APZ, aripiprazole; CZP, clozapine; LTG, lamotrigine.

Atropine, propofol, and rocuronium were administered as standard premedication. The electrical dose was titrated to the seizure threshold of the patient at 0.5-ms pulse width, 60-Hz frequency, 7.5-s stimulus duration, and 900-mA current using Thymatron® System IV (Somatics LLC, Venice, FL, USA), and bifrontotemporal stimulation was applied. We started ECT with Thymatron® at 40% stimulation strength, but finally increased stimulation strength to 80% when no effective convulsions were achieved at the initial stimulation strength. Increasing the stimulation strength to 80% produced an effective seizure duration of 20–40 s.

Informed consent

Before participating, an explanation of the risks and benefits of this therapy procedure was given to the patient and his family, and we obtained informed consent from them. The patient and his family also provided consent for publication of this case.

Ethics statement

This study obeyed the rule of the Ethics Committee of Fukushima Medical University Hospital, and conformed to the provisions of the Declaration of Helsinki.


Total Positive and Negative Syndrome Scale (PANSS) score was markedly reduced by 36, from 108 before combining clozapine and ECT, to 72 at the completion of initial ECT. Consequently, he became able to take part in daily occupational therapy programs in a step-by-step manner after starting clozapine and ECT. Furthermore, he had often refused to take the oral drugs because of the firmly rooted delusion of poisoning during clozapine monotherapy, but became able to take oral drugs in a stable manner. The adverse effect of severe neck dystonia also disappeared. However, about 1 month after the final session of acute-phase ECT, symptoms became unstable again and the patient sometimes presented with a state of hallucination-delusion again, despite continuing to take clozapine. We then began to perform m-ECT once every 1 or 2 weeks with the aim of achieving improvements in this stagnant situation. This combination of clozapine and m-ECT enabled the patient to stay out overnight from our hospital in the acute phase (first 8 sessions) and total PANSS score reduced markedly to a maximum of 66. The patient was undergoing maintenance ECT for half a year once a month when PANSS was 66. The patient was finally able to be discharged from our hospital on day 578 after admission, thanks to additional m-ECT (Figure 1). As of the time of writing, the patient is regularly attending community workshops while receiving m-ECT once a month. As shown in Figure 1, the improvement of negative symptoms was more marked than that of positive symptoms in this patient. Monthly ECT was continued for 7 months. PANSS score was 66 at the time of the last ECT.


No clear adverse effects were seen with clozapine and m-ECT combination therapy in this case.

Since the dosing of stimulation is an important factor in the risk of status epilepticus, we started ECT at a stimulation strength of 40% and increased gradually. However, a drop in the convulsion threshold is one side effect of clozapine, and prolonged convulsions are a known adverse effect of ECT. The risk of status epilepticus might thus be increased with this combination therapy compared to each therapy alone. Care regarding the potential for adverse events is therefore warranted. On the other hand, lamotrigine had been used in this case as a mood stabilizer. This might have helped to avoid the development of harmful phenomena. In addition, sufficient monitoring is necessary because cardiovascular diseases such as myocarditis or cardiomyopathy can develop as serious side effects of clozapine, and harmful cardiovascular complications have also been reported with ECT. Furthermore, application of m-ECT considerably increases the number of sessions. The potential for a negative influence on cognitive function is thus another concern. Young TRS patients without complications seem likely to represent a good target population for combination therapy with clozapine and m-ECT when potential complications are considered.

In this case, combination therapy with clozapine and m-ECT proved greatly effective in improving symptoms for this patient. In particular, this regimen was more effective for improving negative symptoms than for improving positive symptoms. In addition, the problem of the patient not taking oral drugs due to a delusion of poisoning was resolved, and the patient was finally able to be discharged from the hospital. Only a small number of studies, mainly case reports, have addressed the combination of clozapine and c-ECT/m-ECT,13 and no RCT appears to have report eds the effectiveness of the combining clozapine and c-ECT/m-ECT.10,11 Further cases of TRS treated using combination therapy with clozapine and continuous/maintenance ECT are needed to confirm the effectiveness of this approach, and more studies are also strongly recommended to determine whether effective periods for this therapy can be expanded.

Author contributions

All authors contributed to data analysis, drafting and revising the article, gave final approval of the version to be published, and agree to be accountable for all aspects of the work.


The authors report no conflicts of interest in this work.


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