Publications by authors named "Itaru Miura"

Objectives: The Russian-Ukrainian War of 2022 (RUW-2022) was accompanied by the subsequent risk of accidents at a nuclear power plant in Ukraine. This study investigated posttraumatic stress (PTS) symptoms related to media reports of an attack on a Ukrainian nuclear power plant during the RUW-2022 among victims of the Fukushima nuclear disaster and revealed their association with radiation risk perception (RRP) of the accident.

Methods: This cross-sectional study targeted 1193 residents of Naraha Town in Fukushima Prefecture.

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  • This study highlights the negative attitudes towards schizophrenia among various groups, including medical students, psychiatrists, and non-medical workers.
  • An 18-item survey assessed factors like stigma and skepticism about treatment, revealing significant differences in discrimination scores.
  • Findings show that psychiatrists had lower stigma levels compared to other groups, and medical students in their fourth year displayed higher underestimation of patients' abilities than those in their third year.
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Background: Cognitive dysfunction is a core feature of schizophrenia. Although treatment-resistant schizophrenia (TRS) exhibits wide-ranging neuropsychological deficits, factors defining cognitive prognosis in TRS are unclear. We aimed to clarify the association between cognitive dysfunction and factors, such as plasma concentrations of clozapine (CLZ), N-desmethylclozapine (NDMC), and homovanillic acid (HVA), due to differences in antipsychotic responses in patients with schizophrenia.

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Background: Cognitive abnormalities associated with electroconvulsive therapy (ECT) are limited to the first few days after treatment. Mismatch negativity (MMN) is an event-related potential that reflects an automatic auditory change detection process under nonattention conditions and cognitive function in psychotic disorders and may be trait- or state-dependent. This study aimed to report the changes in MMN and cognitive function after two ECT treatments in a female patient who underwent maintenance ECT for atypical psychosis.

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Purpose: To evaluate the effect of lurasidone on a new, patient Life Engagement scale in schizophrenia.

Patients And Methods: This post-hoc analysis included participants (ages 18 to 74) diagnosed with schizophrenia who were randomized to lurasidone (40 mg/day) or placebo in a 6-week double-blind efficacy study and those who continued in a subsequent 12-week open-label extension study during which patients received either 40 or 80/mg day lurasidone (flexibly dosed). Change in life engagement was measured using the Positive and Negative Syndrome Scale (PANSS) 11-item Life Engagement subscale score, and individual subscale items, at week 6 during the double-blind phase and extension phase week 12 during the open-label extension phase.

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Mismatch negativity (MMN) is automatically elicited by incoming sound deviation compared to the neural representation of preceding homogenous sounds stored in the brain's auditory sensory memory. This study aimed to assess time-functional deviation sensitivity in auditory sensory memory associated with a temporal window of integration (TWI) of 160-170 msec in patients with schizophrenia. To this end, we measured the magnetic counterpart of the MMN (MMNm) in 20 patients with schizophrenia on medication and 20 healthy age-matched adults as a control group responding to an omitted tone segment incorporated into a complex sound of 176 ms duration corresponding to the TWI duration.

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Aim: This study aimed to clarify the abnormalities in dopamine transporter (DAT) availability in drug-naive adult patients with attention-deficit/hyperactivity disorder (ADHD) and the relationship between ADHD symptoms and abnormalities in DAT availability.

Methods: Single-photon emission tomography (SPECT) was performed using iodine-123-β-carbomethoxy-3β-(4-iodophenyltropane) (I-123 β CIT) as a tracer to measure in vivo DAT availability in 20 drug-naive patients with ADHD [mean age ± standard deviation (SD)]: 25 ± 3.44 years; male:female = 11:9] and 20 age- and sex-matched healthy controls (HCs) (mean age ± SD: 23.

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This study sought to explore factors related to community transition after the mandatory evacuation of psychiatric inpatients to other hospitals owing to the Fukushima Daiichi Nuclear Power Plant accident. A retrospective cohort design was adopted and 391 psychiatric patients were examined. Univariate and multivariate analyses were conducted to confirm the association between the achievement or non-achievement of discharge to community living and their backgrounds (age, gender, evacuation destination, psychiatric diagnoses, and physical complications).

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To evaluate the effects of lurasidone on social functioning in schizophrenia over the course of a 6-week, double-blind, placebo-controlled study and a subsequent 12-week open-label extension study. A total of 478 patients with schizophrenia (per criteria) randomized to either lurasidone 40 mg/d (n = 245) or placebo (n = 233) in the initial 6-week double-blind study (initiated May 2016, completed November 2018) were included in the analysis. Longer-term changes were examined in a sample of 146 patients who received lurasidone, and 141 who received placebo, during the 6-week study and received flexibly dosed (40-80 mg/d) lurasidone during the 12-week extension phase.

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This review aims to provide a comprehensive overview of the current literature on the drug design, development, and therapy of lurasidone for the treatment of schizophrenia. Lurasidone has antagonistic effects on the dopamine D, 5-hydroxytryptamine (5-HT), and 5-HT receptors and a partial agonistic effect on the 5-HT receptor with low affinities for muscarinic M, histamine H, and a adrenergic receptors. The receptor-binding profile of lurasidone is thought to be associated with fewer side effects such as anticholinergic effects, lipid abnormalities, hyperglycemia, and weight gain.

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  • The study aimed to determine the effectiveness of antidepressants approved in Japan for treating major depressive disorder (MDD) in Japanese patients through a systematic review and meta-analysis of nine trials.
  • The results showed that newer antidepressants significantly improved depressive symptoms, treatment response, and remission rates compared to placebo, with statistically significant values reported.
  • However, while there was no significant difference in overall discontinuation rates, the antidepressant group faced higher discontinuation due to side effects and a greater incidence of adverse events compared to the placebo group.
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  • Clozapine (CLZ) is a medication often prescribed for patients with treatment-resistant schizophrenia, but it carries risks of serious side effects and interactions with other drugs.
  • A case study reported a 35-year-old male patient whose CLZ levels rose significantly after starting lemborexant (LEM) for insomnia, leading to oversedation, while levels returned to normal after stopping LEM.
  • In vitro experiments suggested that LEM may inhibit the metabolism of CLZ through CYP3A4, indicating potential drug-drug interactions that could increase the risk of adverse effects associated with CLZ.
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Study Objectives: We conducted a retrospective study to investigate the efficacy and safety of switching from other hypnotics, including benzodiazepines and Z-drugs, suvorexant, ramelteon, mirtazapine, trazodone, and antipsychotics, to lemborexant, a dual orexin receptor antagonist, for 3 months.

Methods: Clinical data obtained from the medical records of 61 patients treated at the Horikoshi Psychosomatic Clinic between December 2020 and February 2022 were analyzed, including the Athens Insomnia Scale, Epworth Sleepiness Scale, and Perceived Deficits Questionnaire-5. The primary outcome was the mean change in Athens Insomnia Scale score after 3 months.

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Introduction: Attention-deficit/hyperactivity disorder (ADHD) is a neuropsychiatric disorder whose primary symptoms are hyperactivity, impulsivity, and inattention. Historically, ADHD was recognized as a disease of childhood and adolescence. However, many patients are known to have persistent symptoms into adulthood.

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Evacuees of the Great East Japan Earthquake have experienced adverse, long-term physical and psychological effects, including problem drinking. This study examined the risk and recovery factors for problem drinking among evacuees between fiscal years (FY) 2012 and 2017 using data on residents in the evacuation area from the Mental Health and Lifestyle Survey. With the FY 2012 survey as a baseline, a survey comprising 15,976 men and women was conducted in the evacuation area from FY 2013 to FY 2017, examining the risk and protective factors for problem drinking.

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Background: Post-evacuation return after mandatory hospital evacuation due to complicated disasters is often overlooked and not well-discussed.

Aims: In this study, we explored the factors which are related to the ease or difficulty of the post-evacuation return to Fukushima prefecture of psychiatric inpatients who had been evacuated to hospitals outside the prefecture because of the Great East Japan Earthquake (GEJE) and subsequent Fukushima Daiichi Nuclear Power Plant (FDNPP) accident.

Method: This retrospective cohort study included evacuated psychiatric hospital inpatients who were registered in the Matching Project for Community Transition (MPCT) and had been traced until July 31, 2019.

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Background: The relationship between radiation levels and mental health status after a nuclear disaster is unknown. We examined the association between individual external radiation doses and psychological distress or post-traumatic stress after the Fukushima Daiichi nuclear power plant accident in March 2011 in Japan.

Methods: The Mental Health and Lifestyle Survey was conducted from January 2012.

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  • The Mental Health and Lifestyle Survey (MHLS) has been conducted annually since 2012 to monitor health issues related to the long-term evacuation of people affected by the 2011 Fukushima disaster, involving nearly 210,000 participants.
  • The survey results lead to telephone-based interventions for over 3,000 respondents each year, focusing on non-radiological health effects, particularly mental health outcomes like depressive symptoms and posttraumatic responses.
  • Although there have been improvements in mental health outcomes, many respondents still show high risks for psychiatric problems, especially among those living outside Fukushima Prefecture, indicating the need for ongoing adjustments to the MHLS for better support.
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  • The Fukushima Health Management Survey (FHMS) was created after the Fukushima nuclear accident in 2011 to track long-term health and study the effects of low-dose radiation on residents.
  • The FHMS includes multiple components like health examinations and surveys but faced challenges such as a low response rate, though follow-up surveys confirmed the validity of radiation exposure data.
  • Findings show no clear link between radiation and thyroid cancer risk, but there is evidence of declining physical and mental health, leading to the decision to end the Pregnancy and Birth Survey in March 2021.
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Purpose: To evaluate the effectiveness and safety of lurasidone 80 mg/day (versus the 40 mg/day dose) during a 12-week, open-label extension study in patients with an acute exacerbation of schizophrenia who had completed a 6-week double-blind study of lurasidone.

Patients And Methods: A total of 289 adult patients with schizophrenia completed the double-blind study and enrolled in the 12-week extension study. Lurasidone was flexibly dosed at 40 or 80 mg/day.

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Background: Whether second-generation antipsychotic long-acting injection (SGA-LAI) reduces psychotic symptoms at relapse compared with oral antipsychotics remains unclear. The present study investigated the effects of SGA-LAI on the time (in hours) of restrictive interventions in hospitalization by conducting a retrospective observational 4-year mirror-image study at a single medical center in Japan.

Method: We performed a retrospective observational mirror-image study conducted between November 2013 and January 2018.

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Although the prevalence of cognitive impairment and depression is higher in patients with atrial fibrillation (AF) than in the general population, the mechanism has not been fully examined and impact of catheter ablation (CA) of AF also remains unclear. Recently, the development of near-infrared spectroscopy (NIRS) has enabled noninvasive measurements of regional cerebral blood volume and brain activity, in terms of cerebral oxyhemoglobin in the cerebral cortex. We assessed brain activities by NIRS, depressive symptoms by the Center for Epidemiologic Studies Depression Scale (CES-D) and cognitive function by Mini-Mental State Examination (MMSE).

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