Publications by authors named "Phern Chern Tor"

Background: Functional connectivity (FC) is often used to identify personalized targets for transcranial magnetic stimulation (TMS). However, existing methods often overlook individual differences in whole-cortex network organization. Furthermore, in some personalized TMS protocols, a lower stimulation intensity is used for targets closer to the scalp.

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Schizophrenia is the leading indication for electroconvulsive therapy (ECT) in Asia; however, optimal ECT parameters for this condition remain under-researched. This study examines the impact of stimulus dosage in bifrontal ECT on symptomatic improvement in 122 patients treated at the Institute of Mental Health, Singapore. In this retrospective analysis, patients were categorized into two groups based on a 1.

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Accelerated intermittent theta burst stimulation (aiTBS) is a novel and effective treatment for drug-resistant depression. While past studies have identified encephalography (EEG) features predicting repetitive transcranial magnetic stimulation (rTMS) outcomes, EEG biomarkers specifically for aiTBS in depression patients have not been explored. In this pilot trial on 5 depression patients undergoing aiTBS, we assessed clinical outcome using the Montgomery-Asberg Depression Rating Scale (MADRS) and collected resting-state EEG pre and post-treatment.

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Electroconvulsive therapy (ECT) is a recognized treatment option for patients with schizophrenia, especially when patients do not respond adequately to antipsychotic medication or when rapid response is needed in severe cases. The 3 common electrode placements, namely, bitemporal, bifrontal and right unilateral (RUL) modalities, have all been described by various studies to be efficacious in symptom reduction. However, the optimal electrode placement with the greatest success rate in the treatment of schizophrenia has yet to be ascertained.

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Electroconvulsive therapy (ECT) is widely used to treat various psychiatric disorders, with patients often undergoing multiple courses of ECT. However, it remains unclear whether responses to one ECT course can be replicated in subsequent treatment courses. A retrospective cohort study at the Institute of Mental Health, Singapore, studied 226 patients who underwent at least two courses of ECT between March 2017 and May 2023.

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Background: Electroconvulsive therapy (ECT) is a highly effective treatment for schizophrenia and mood disorders; however, most evidence is derived from the adult population, with less evidence in adolescents. We sought to determine the use of ECT in adolescents in the Institute of Mental Health (IMH) and evaluate the treatment outcome.

Methods: We conducted a retrospective naturalistic analysis of ECT registry data of patients aged from 10 to 19 years from March 2017 to March 2023.

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Article Synopsis
  • Transcranial magnetic stimulation (TMS) is a treatment that can help people with serious mental health issues, but it usually uses the same method for everyone.
  • Researchers found that different parts of the brain work better for treating different problems: one area helps with depression, another with anxiety, and another with schizophrenia.
  • They reviewed studies to figure out how to make TMS more personalized and effective by targeting specific brain areas for different symptoms.
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  • There is limited evidence on schizophrenia relapse following electroconvulsive therapy (ECT), prompting a systematic review to gather more data on this issue.
  • The study analyzed 29 research papers, finding that relapse rates for schizophrenia after acute ECT were 24% at 3 months, increasing to 55% by 24 months.
  • Adding maintenance ECT along with antipsychotics significantly lowered the relapse rate to 20% at the 6-month mark, indicating the need for further research to improve treatment strategies post-ECT.
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Objectives: Repetitive transcranial magnetic stimulation (rTMS) has shown promising results in enhancing motor recovery after stroke, but nuances regarding its use, such as the impact of the type and site of stimulation, are not yet established. We aimed to perform a systematic review and meta-analysis of randomized controlled trials (RCTs) with low risk of bias to investigate the effect of rTMS on motor recovery after both ischemic and hemorrhagic stroke.

Materials And Methods: Three databases were searched systematically for all RCTs reporting comparisons between rTMS (including theta-burst stimulation) and either no stimulation or sham stimulation up to August 19, 2022.

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Introduction: Repetitive transcranial magnetic stimulation (rTMS) is used for treatment-resistant major depressive disorder (MDD) and obsessive-compulsive disorder (OCD), but there are few studies on patient outcomes in Southeast Asia. In this study, we describe the clinical profile and outcome of patients with MDD and OCD treated with rTMS in Singapore.

Method: A naturalistic retrospective study of 71 patients (inpatient and outpatient) who received rTMS treatment between June 2018 and April 2023 was conducted.

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  • The study investigates how age affects the response to electroconvulsive therapy (ECT) in patients with various mental health conditions, including depression and schizophrenia.
  • A total of 1,056 patients were analyzed, revealing that older patients showed significant improvement in depression after ECT, but this effect was not consistent across all age groups or conditions like bipolar disorder and schizophrenia.
  • The findings suggest that while ECT is effective for patients regardless of age, younger individuals with psychotic depression might benefit more compared to their older counterparts, highlighting the need to consider other factors when predicting ECT outcomes.
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  • This study looked at how past traumatic events affect PTSD and depression in Asian patients with mood disorders.
  • It found that feeling supported by others can help reduce PTSD symptoms that come from these traumatic events.
  • The results can help improve treatments for PTSD but may not apply to people outside of Singapore because of different cultures.
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Negative symptoms in schizophrenia impose a significant burden with limited effective pharmacological treatment options. Recent trials have shown preliminary evidence for the efficacy of using intermittent theta burst stimulation (iTBS) in treating negative symptoms in schizophrenia. We aim to systematically review the current evidence of iTBS in the treatment of the negative symptoms of schizophrenia as an augmentation therapy.

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Electroconvulsive Therapy (ECT) is an effective treatment for mood and psychotic disorders but there is growing evidence of treatment resistant to ECT. Our study aimed to investigate the relationship between the number of previous illness episodes and the symptomatic improvement after acute ECT treatment. We conducted a retrospective naturalistic cohort analysis of patients' ECT registry data from March 2017 to February 2023.

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Objective: There is limited literature examining the effect of early electroconvulsive therapy(ECT) on the length of stay(LOS), especially for psychotic disorders. This study aimed to evaluate the association between early ECT and LOS in three main groups of patients with bipolar, depressive and primary psychotic disorders.

Method: A retrospective descriptive analysis of 464 patients who received inpatient ECT from May 2017 to March 2021 in a large tertiary psychiatric institution was conducted.

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Objective: Global emotion dysregulation mediates the relationship between child maltreatment and severe depressive symptoms; however, there is a lack of research on maladaptive personality traits and their contribution to individual differences in global emotion dysregulation within this conceptual model. The present study tested a preliminary serial mediation model where maladaptive personality traits and global emotion dysregulation mediate the relationship between child maltreatment and severe depressive symptoms.

Method: A total of 200 patients with mood disorders ( = 36.

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Background: The transdiagnostic effect of continuation/maintenance ECT (CM-ECT) across mood and psychotic disorders on hospital psychiatric readmission risk and total direct cost remains unclear.

Methods: A naturalistic retrospective analysis of 540 patients who received inpatient acute ECT treatment from May 2017 to Mar 2021 in a tertiary psychiatric institution. Patients were assessed with validated clinical rating scales pre-ECT and after the first 6 treatments of a course of inpatient acute ECT.

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Introduction: Previous studies on the effects of electroconvulsive therapy (ECT) on cognition in schizophrenia have been inconclusive. This study aimed to identify factors that may predict cognitive improvement or deterioration in patients with schizophrenia after-ECT.

Materials & Methods: Patients with schizophrenia or schizoaffective disorder with predominantly positive psychotic symptoms, who were treated with ECT at the Institute of Mental Health (IMH), Singapore, between January 2016 and January 2018, were assessed.

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Article Synopsis
  • - The text discusses the lack of a universal definition for treatment-resistant depression (TRD) in Southeast Asia, demonstrating the need for a standardized approach to its management across the region.
  • - A panel of 13 psychiatrists developed a new term, "pharmacotherapy-resistant depression" (PRD), defining it as the failure of two adequate drug treatments during a major depressive episode, and outlined a stepwise treatment plan including medication adjustments and non-pharmacological options.
  • - The consensus recommendations can be adapted to different Southeast Asian contexts, but the importance of clinical judgment and individual patient circumstances in treatment decisions remains emphasized.
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Introduction: The effects of electroconvulsive therapy (ECT) on quality of life (QoL), and its relationship with symptom and cognitive change remains unclear. We aim to examine the association of QoL changes with psychiatric symptom and cognitive changes among patients with schizophrenia who underwent ECT.

Methods: This is a retrospective cohort study of 132 patients who received ECT from July 2017 to December 2019.

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Objective: The treatment efficacy of electroconvulsive therapy (ECT) for negative symptoms amongst patients with schizophrenia remains unclear. In this study, we aim to examine the effects of ECT on negative symptoms in schizophrenia and their association with other clinical outcomes, including cognition and function.

Methods: This is a retrospective data analysis of patients with schizophrenia/schizoaffective disorder treated with ECT at the Institute of Mental Health (IMH), Singapore, between January 2016 and December 2019.

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Objectives: On a background of the rapidly expanding clinical use of ketamine and esketamine for treatment of depression and other conditions, we examined safety monitoring, seeking to identify knowledge gaps relevant to clinical practice.

Methods: An international group of psychiatrists discussed the issue of safety of ketamine and esketamine and came to a consensus on key safety gaps.

Results: There is no standard safety monitoring for off-label generic ketamine.

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