Publications by authors named "Dai Miyawaki"

Article Synopsis
  • Family-based treatment (FBT) is an effective method for treating anorexia nervosa (AN) in children and adolescents, but its application in Japan is limited due to specific guidelines and family involvement requirements.
  • A 14-year-old girl with AN was hospitalized for malnutrition and dehydration, where she began modified FBT and continued it as an outpatient, achieving remission after a year.
  • This case suggests that starting FBT during hospitalization can be beneficial for severe AN cases, highlighting the need for cultural adaptations of FBT to improve its accessibility.
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Rationale: Ornithine transcarbamylase (OTC) deficiency, a urea cycle disorder, is a rare congenital metabolic error that leads to hyperammonemia. Psychiatric symptoms of hyperammonemia are nonspecific and can cause autism spectrum disorder (ASD)-like symptoms and attention-deficit/hyperactivity disorder (ADHD)-like symptoms. Some studies report that OTC deficiency is often initially diagnosed as ASD or ADHD.

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Purpose: Internet addiction (IA) has become a global problem and is one of the most common reasons for children to be referred for intervention because IA results in social and educational dysfunction and conflict with parents. IA is associated with various comorbid psychiatric disorders, with notable association between IA and family factors. However, little is known about parental psychopathology.

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Irritability is one of the most common reasons for which children and adolescents are referred for psychiatric evaluation and care. However, clinical irritability is difficult to define; thus, its prevalence varies widely. Chronic irritability may be associated with sensory processing difficulties (SPD), but little is known about the relationship between these two factors in clinical populations.

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Rationale: Coronavirus disease 2019 (COVID-19) is affecting mental health profoundly. Previous studies have reported pandemic-related anxiety. Anxiety disorder and autism spectrum disorder (ASD) are common comorbidities.

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Objective: Although eating disorders (EDs) surged in the late 1900s and are now recognized worldwide, the time trend of ED characteristics remains unknown. This study aimed to clarify changes in characteristics of anorexia nervosa restricting type (AN-R) over 30 years.

Methods: We conducted a cross-sectional study and examined 996 female treatment-seeking patients with AN-R in Japan from 1988 to 2018.

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Given the lack of clear consensus on effective treatment models for adolescent anorexia nervosa in Japan, treatment programs offered to this population vary widely between treatment facilities with limited testing of outcomes. Importantly, families have traditionally been left out of the core treatment process, as they are commonly viewed as being powerless in renourishing their child. The purpose of this commentary was to report the authors' preliminary efforts to introduce and implement family-based treatment (FBT) in Japan so that, on par with international standards of practice, FBT may become the first-line treatment option for Japanese families.

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Purpose: Shoplifting, prevalent in patients diagnosed with bulimia nervosa (BN), is a serious behavioral problem in eating disorder (ED) patients. However, little is known about its overall presence, etiology, and consequences. This study aimed to determine whether shoplifting occurs before or after the onset of ED and to investigate the prevalence and correlates of shoplifting in ED patients.

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Early-onset obsessive-compulsive disorder (OCD) is more severe than later-onset OCD. There are no reports of any early-onset OCD patients being cured, especially with respect to preschoolers. In this case report, we describe the successful treatment and cure of a 6-year-old preschool girl with severe OCD since the age of 3.

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Wind-induced upwelling of hypoxic waters containing hydrogen sulfide (HS) sometimes causes mass mortalities of aquatic organisms inhabiting coastal areas, including the hypoxia-tolerant Manila clam Ruditapes philippinarum. We examined the tolerance of Manila clam to HS under controlled laboratory conditions. Larvae and juveniles obtained by artificial fertilization or from a wild population were exposed to normoxic or to hypoxic water with or without un-ionized HS (concentrations, 0.

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Background: Children with autism spectrum disorder (ASD) have varied comorbidities. With regard to comorbidity, there has been increasing interest in bipolar disorder (BP) in children. However, the prevalence of BP with ASD has varied because of the methodological differences used.

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Background: Non-psychotic delusions are reported to be associated with depression and anxiety. When these delusions occur in high-functioning pervasive developmental disorder (HFPDD) children, they are often misdiagnosed as schizophrenia and have consequently been studied less. This study has three goals: to investigate the prevalence of non-psychotic delusions in HFPDD children, to test the hypothesis that HFPDD children are more likely to have non-psychotic delusions than non-HFPDD children, and to test the hypothesis that non-psychotic delusions are associated with depression and anxiety.

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Psychogenic nonepileptic seizures (PNES) are observable changes in behavior or consciousness that are similar to epileptic seizures but are not associated with electrophysiologic changes. PNES occur in children with underlying psychological distress and are especially frequent in those with epilepsy. Because PNES are heterogeneous, comprehensive treatment tailored to each patient is required to reduce psychosocial stress.

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Background: Studies have shown that children with pervasive developmental disorder (PDD) have high rates of sensory hypersensitivity. In addition, a few recent studies suggested that sensory hypersensitivity was related to anxiety or depression. However, most studies had methodological limitations because they included children with mental retardation and did not examine broadband psychopathology.

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Background: In previous studies for children with pervasive developmental disorder (PDD), the prevalence for psychiatric comorbidities has varied because of their methodological differences. In this research, our PDD subjects were strictly limited by age and IQ scores, and we utilized a semi-structured interview to diagnose their coexisting disorders. The purpose of this study is to identify reliable prevalence and types of psychiatric comorbidities in children with high-functioning PDD (HFPDD).

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Background: Anxiety symptoms in children with pervasive developmental disorder (PDD) often appear to be not as severe as those in children with anxiety disorders or often appear to be the core features of PDD, and therefore, they do not meet the diagnostic criteria for anxiety disorders. In this study, we assessed anxiety broadly in line with dimensions of anxiety and not with an operational categorical diagnosis. The objective of this study was to reveal that children with high-functioning PDD have more anxiety than children in the general population.

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Aims: Sensory-perceptual abnormalities, which include hyper- and hyposensitivity, have been identified by numerous researchers as prevalent in individuals with pervasive developmental disorders (PDD). Hypersensitivity has a greater impact on PDD patients' daily lives than hyposensitivity. The purpose of the present study was to clarify the relationship of hypersensitivity to anxiety, depression and other psychopathology in children with PDD.

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Background: Although there are many reports of high rates of hyperactivity and attention deficits in children with Pervasive Developmental Disorders (PDD), controversy remains about the applicability of the diagnosis of Attention-Deficit/Hyperactivity Disorder (ADHD) to PDD children. The present study elucidates the similarities and differences of ADHD symptoms in PDD children compared to ADHD children.

Methods: Twenty-seven male children with PDD+ADHD Combined type (ADHD-C), 17 males with ADHD-C, and 9 males with PDD without ADHD-C, were compared on measures of ADHD symptoms and related behaviors using parent ratings and teacher ratings on the ADHD Rating Scale (ADHDRS), the Child Behavior Checklist (CBCL) and the Teacher Report Form (TRF).

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No previous study about comorbidity of attention-deficit/hyperactivity disorder (ADHD) in Japan have carried out both a comprehensive investigation using a structured interview and a comparison between ADHD subtypes. The aim of the present study was to clarify the relationship between hyperactivity and disruptive behavior disorder (DBD) in ADHD by comparing a hyperactivity group (HG) with a non-hyperactivity group (non-HG). After diagnosis was carried out by strict exclusion, the 41 ADHD subjects (6-14 years old; IQ, 70-121) diagnosed according to DSM-IV were divided into HG (n = 24) and non-HG (n = 17), and compared for comorbidities and psychopathologies.

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