Publications by authors named "Yoshitaka Nishizawa"

Background: Insomnia is often treated with benzodiazepines, which can lead to long-term use and potential complications, especially if underlying conditions like sleep apnea syndrome (SAS) go undiagnosed. This case report describes a 70-year-old woman with chronic insomnia, benzodiazepine and alcohol abuse, and a previously undiagnosed severe SAS.

Case Presentation: The patient, a 70-year-old woman was admitted for suspected delirium caused by benzodiazepine and alcohol abuse.

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The mechanism underlying the efficacy of repetitive transcranial magnetic stimulation (rTMS) remains unclear, particularly regarding its impact on different severities of depression. From a personalized treatment perspective, evaluating functional improvements by illness severity is crucial. This study investigated changes in cerebral hemodynamics before and after six weeks of rTMS treatment in 45 patients with depression, using functional near-infrared spectroscopy (fNIRS).

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Post-operative delirium (POD) is a common complication after surgery especially in elderly patients, characterized by acute disturbances in consciousness and cognition, which negatively impacts long-term outcomes. Effective treatments remain elusive due to the unclear pathophysiology of POD. To address the knowledge gap, we investigated DNA methylation profiles and gene expression changes in brain cells from POD and non-POD patients who underwent brain resection surgery for medication refractory epilepsy.

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Aim: The pathophysiological mechanisms of postoperative delirium (POD) are still unclear, and there is no reliable biomarker to distinguish between those with and without POD. Our aim was to discover DNAm markers associated with POD in blood collected from patients before and after gastrointestinal surgery.

Method: We collected blood samples from 16 patients including 7 POD patients at three timepoints; before surgery (pre), the first and third postoperative days (day1 and day3).

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  • * The study aimed to identify consistent DNA methylation (DNAm) markers associated with delirium by analyzing blood samples from four different patient cohorts.
  • * Results showed that 11 out of 13 previously identified top CpG sites had significant DNAm differences between delirious and non-delirious patients, suggesting that epigenetic biomarkers could be useful for diagnosis and understanding delirium's underlying biology.
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Delirium, a syndrome characterized by an acute change in attention, awareness, and cognition, is commonly observed in older adults, although there are few quantitative monitoring methods in the clinical setting. We developed a bispectral electroencephalography (BSEEG) method capable of detecting delirium and can quantify the severity of delirium using a novel algorithm. Preclinical application of this novel BSEEG method can capture a delirium-like state in mice following lipopolysaccharide administration.

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  • Military sexual trauma (MST) is a significant concern in the U.S. military, often leading to mental health issues like PTSD and major depressive disorder, but not all MST victims experience these conditions.
  • In this study, saliva samples from 113 female veterans were analyzed for DNA methylation patterns to understand differences between those with and without MST, PTSD, and major depressive disorder.
  • The research identified a specific region near the ZFP57 gene that showed altered DNA methylation in PTSD cases, suggesting that ZFP57 may play a role in PTSD susceptibility and warranting further investigation.
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  • This study investigates the relationship between NSAID use, DNA methylation, and biological pathways associated with aging and diseases like delirium.
  • Researchers collected blood samples from 171 patients to analyze DNA methylation profiles and assess NSAID use through electronic medical records.
  • Although several biological pathways related to NSAIDs were identified, the results were not statistically significant, indicating that the findings are preliminary and warrant further exploration.
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Objective: Delirium is dangerous and a predictor of poor patient outcomes. We have previously reported the utility of the bispectral EEG (BSEEG) with a novel algorithm for the detection of delirium and prediction of patient outcomes including mortality. The present study employed a normalized BSEEG (nBSEEG) score to integrate the previous cohorts to combine their data to investigate the prediction of patient outcomes.

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Objective: To investigate the relationship between history of anti-inflammatory medication use and delirium risk, as well as long-term mortality.

Methods: In this retrospective cohort study, subjects recruited between January 2016 and March 2020 were analyzed. Information about anti-inflammatory medication use history including aspirin, NSAIDs, glucosamine, and other anti-inflammatory drugs, was collected.

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  • * Analyzing DNA samples from 40 patients, the most significant difference was found at a specific site in the brain near the ADAMTS9 gene, but no findings reached genome-wide significance.
  • * The enrichment analysis revealed pathways related to glial cell differentiation in the brain, immune function in blood, and circadian rhythm in saliva and buccal samples, suggesting DNA methylation may play a role in the mechanisms of delirium.
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  • Multichannel functional near-infrared spectroscopy (fNIRS) measures changes in cerebral blood flow, showing that depression is linked to decreased blood flow in the frontal cortex, known as hypofrontality.
  • Repetitive transcranial magnetic stimulation (rTMS) and electroconvulsive therapy (ECT) are alternative treatments for depression, although their mechanisms are not fully understood.
  • This study found that after 30 rTMS sessions, patients experienced a significant increase in oxygenated hemoglobin, indicating improved blood flow in the frontal cortex, which may activate neuronal synapses and enhance treatment effects.
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Objective: Accumulated evidence collected via functional near-infrared spectroscopy (fNIRS) has been reported with regard to mental disorders. A previous finding revealed that emotional words evoke left frontal cortex activity in patients with depression. The primary aim of the current study was to replicate this finding using an independent dataset and evaluate the brain region associated with the severity of depression using an emotional Stroop task.

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Introduction: The search for objective biomarkers of psychiatric disorders has a long history. Despite this, no universally accepted instruments or methods to detect biomarkers have been developed. One potential exception is near-infrared spectroscopy, although interpreting the measures of blood flow recorded with this technique remains controversial.

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Introduction: Electroconvulsive therapy (ECT) is currently regarded as a significant treatment option for intractable psychiatric disorders, such as catatonic schizophrenia or treatment-resistant depression; however, the underlying molecular mechanism for its therapeutic effect remains obscure.

Methods: Employing microarray analysis (Human Genome U133 Plus 2.0 Array; Affymetrix, United States) of cDNA derived from the peripheral blood of patients with catatonic schizophrenia (n = 5), we detected a significant change in 145 genes (0.

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