Publications by authors named "Okamura A"

Migration routes and the depth patterns of anguillid eel larvae migrating long distances from spawning grounds in the ocean remain poorly understood. We used otolith stable isotope analysis to study the oceanic migrations of anguillid eels by reconstructing experienced water temperature histories of larvae. The otolith stable oxygen isotopes (δO) of recruited Anguilla japonica glass eels were analyzed to assess the relationship with the experienced water temperature of the early larval stage in laboratory experiments.

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Background And Purpose: It remains unclear whether the lymph-node ratio (LNR) is a relevant factor for the risk of recurrence following neoadjuvant chemotherapy (nCT) with docetaxel, cisplatin, and 5-fluorouracil (DCF), which is a new standard of care for locally advanced esophageal squamous cell carcinoma (ESCC) in Japan. This study aimed to evaluate the clinical utility of LNR as a risk factor for recurrence.

Materials And Methods: We retrospectively analyzed 75 patients who underwent nCT-DCF followed by curative surgery for resectable ESCC.

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The elongation of primary feathers in neonatal chicks is delayed by the late-feathering K gene located on the Z chromosome. We recently found that the K gene slows feather growth by reducing the number of functional prolactin (PRL) receptor (PRLR) dimers. In this study, we investigated the molecular mechanisms by which PRL promotes feather elongation.

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Recently, neoadjuvant chemotherapy comprising docetaxel, cisplatin, and 5-fluorouracil showed promising efficacy for esophageal squamous cell carcinoma. However, some patients do not achieve curative resection despite neoadjuvant chemotherapy using these drugs. This study aimed to clarify the pretherapeutic characteristics of these patients.

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Haptic devices typically rely on rigid actuators and bulky power supply systems, limiting wearability. Soft materials improve comfort, but careful distribution of stiffness is required to ground actuation forces and enable load transfer to the skin. We present Haptiknit, an approach in which soft, wearable, knit textiles with embedded pneumatic actuators enable programmable haptic display.

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In focal epilepsy cases, precise identification and resection of the epileptogenic zone increase the likelihood of achieving a seizure-free outcome. Nevertheless, localizing the source of epilepsy in magnetic resonance imaging-negative epilepsy cases presents significant challenges for clinicians. In this study, we evaluated the diagnostic efficacy and impact on the seizure outcome by using 4 noninvasive modalities, including scalp video electroencephalography, magnetoencephalography, fluorodeoxyglucose-positron emission tomography, and iomazenil single-photon emission computed tomography, in a cohort of patients with magnetic resonance imaging-negative focal epilepsy who underwent resective surgery.

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Here, we describe two cases of retained products of conception (RPOC) that were successfully managed with hysteroscopic resection after laparoscopic temporary uterine artery ligation. Both patients were diagnosed with RPOC after early miscarriages. Case 1 was urgently admitted due to massive bleeding and underwent surgery following a blood transfusion.

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Background: The Apple Watch (AW) can record single-lead electrocardiograms (ECGs) and has been investigated for arrhythmia detection. In this study we evaluated its accuracy in identifying the origin of premature ventricular contractions (PVCs) vs. standard 12-lead ECGs.

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Background: Anastomotic leakage (AL) is a major complication after esophagectomy for esophageal cancer, and the significance of elevated postoperative lactate levels in the occurrence of AL is unclear.

Patients And Methods: We evaluated 583 patients who underwent minimally invasive esophagectomy for esophageal cancer. Serum lactate levels were measured immediately after esophagectomy and in the morning on postoperative days (POD) 1, 2, 3, and 4.

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Article Synopsis
  • The study investigates the effects of an intensified nutrition management (iNM) protocol on patients undergoing esophagectomy for esophageal cancer, comparing it to conventional nutrition management (cNM).
  • It included 126 patients, showing that the iNM group received more frequent nutritional counseling, leading to higher compliance rates and better outcomes in body weight and skeletal muscle index (SMI) after surgery.
  • The results suggest that outpatient iNM effectively reduces body weight loss and SMI decline within 3 to 6 months post-surgery, improving overall nutritional status.
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Objective: Wound dehiscence following craniotomy is a complication for which patients are subjected to additional procedures to achieve wound closure. During surgery for epilepsy, a craniotomy is performed at various sites to cure or palliate seizures in patients with intractable epilepsy. Collaborations between medicine and engineering have provided many surgical devices and materials for various stages of craniotomy, from skin incision to wound closure.

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Background: The tip-detection method and the retrograde approach have been acknowledged as a second-line strategies for chronic total occlusion (CTO) percutaneous coronary intervention (PCI) when conventional antegrade wiring strategies are ineffective. The aim of this study is to compare the efficacy between both strategies for complex CTO PCI.

Methods: We retrospectively enrolled 170 consecutive CTO PCI cases and separated them into 295 adopted strategies.

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  • The study focuses on the tumor immune microenvironment, particularly the roles of regulatory T cells (Tregs) and cytotoxic T cells (CD8+), as factors influencing prognosis in aggressive gastroesophageal adenocarcinomas (GEAs).
  • It found that a high FOXP3+/CD8+ cell ratio at the invasive margin of tumors correlates with worse survival outcomes, especially in RUNX3-methylated diffuse variants compared to intestinal types.
  • The research suggests that increased FOXP3+/CD8+ ratios may facilitate immune evasion in tumors, potentially linked to the signaling molecule CCL28 and its relationship with RUNX3 methylation status.
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Primary Percutaneous Coronary Intervention (PCI) has significantly contributed to reducing the mortality of patients with ST-segment elevation myocardial infarction (STEMI) even in cardiogenic shock and is now the standard of care in most of Japanese institutions. The Task Force on Primary PCI of the Japanese Association of Cardiovascular Intervention and Therapeutics (CVIT) proposed an expert consensus document for the management of acute myocardial infarction (AMI) focusing on procedural aspects of primary PCI in 2018 and updated in 2022. Recently, the European Society of Cardiology (ESC) published the guidelines for the management of acute coronary syndrome in 2023.

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  • This study investigated the effects of perioperative inhaled tiotropium on patients with COPD undergoing esophagectomy, focusing on pneumonia risk and pulmonary function.
  • 32 patients were randomly assigned to either a control group with conventional management or an intervention group receiving tiotropium inhalation before and after their surgery.
  • While the incidence of pneumonia was similar in both groups, the patients using tiotropium showed improved pulmonary function and exercise capacity, leading to less deterioration post-surgery.
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The hemodynamic impact of the implantation depth for balloon-expandable valves is under-investigated, especially with higher implantation techniques. We assessed the hemodynamic performance of supra-annular SAPIEN 3 valve implantation. This retrospective study involved consecutive patients who underwent transcatheter aortic valve replacement (TAVR) using the SAPIEN 3.

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 This study aimed to evaluate and compare the clinical and functional outcomes of two surgical procedures performed in patients with severe grade III and IV rhizarthrosis.  We evaluated 39 patients who underwent two surgical techniques for rhizarthrosis treatment: trapeziectomy using the Kuhns technique or tendon interposition, with a minimum follow-up period of 6 months. The primary outcome assessment used the specific Trapeziometacarpal Arthrosis Symptoms and Disability (TASD) questionnaire, and the secondary outcome evaluation employed the shortened version of the Disabilities of the Arm, Shoulder, and Hand (QuickDASH) questionnaire and the visual analog scale (VAS).

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Article Synopsis
  • - The study aimed to compare the safety and effectiveness of transluminal foam sclerotherapy combined with endovenous laser ablation (EVLA) against EVLA alone for treating small saphenous vein incompetence, focusing on changes in the venous clinical severity score (VCSS) over one year.
  • - Researchers conducted the study by using a sheath for foam sclerotherapy during the EVLA procedure, assessing various outcomes such as VCSS changes, reflux recurrence, and complications at multiple time points after treatment.
  • - Results indicated that while the change in VCSS wasn't significantly impactful, the combination treatment (TLFS + EVLA) led to lower rates of residual or recurrent reflux compared to EVLA alone, suggesting TLFS
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Background: The number of metastatic lymph nodes (LNs) is an important prognostic factor for esophageal cancer, and N staging is important for prognostic stratification. The optimal cutoff values for clinical (cN) and pathologic N (pN) staging should be reconsidered following advances in neoadjuvant therapy.

Methods: The study included 655 patients who underwent esophagectomy between January 2014 and December 2016 in four high-volume centers in Japan.

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  • Trigger finger can cause pain and hinder daily activities, leading to a search for less invasive treatment options due to complications from traditional surgery.
  • An experimental study on cadavers compared three treatments: a new device, ultrasound-guided technique, and a percutaneous needle method, focusing on the effectiveness of A1 pulley release and safety concerning surrounding structures.
  • The new device and ultrasound methods achieved complete A1 pulley release in 100% of cases, while the needle method only succeeded 38% of the time, with the new device showing less damage to flexor tendons and no neurovascular injuries, making it a safer alternative for treating trigger finger.
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Background: Bone marrow metastasis (BMM) of gastric cancer (GC), which is the most common cause of disseminated intravascular coagulation (DIC) among solid tumors, has a poor prognosis. Studies on prognostic improvement beyond one year in patients with GC with BMM are limited. This is the first report of a patient who survived over three years after 30 months of S-1 plus oxaliplatin (SOX) therapy for GC with BMM.

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Background: Second primary esophageal cancer often develops in patients with head and neck cancer, and esophagectomy in patients with a history of total pharyngolaryngectomy (TPL) is challenging. However, the clinical outcomes of these patients have yet to be examined in a multicenter setting.

Methods: We evaluated the surgical outcomes of a nationwide cohort of 62 patients who underwent esophagectomy for esophageal cancer with a history of TPL.

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  • PARP inhibitors have improved outcomes for ovarian cancer patients, but the best approach for those who relapse during maintenance therapy is unclear.
  • A study examined the effects of platinum-based chemotherapy following PARP-i treatment in recurrent ovarian cancer patients, finding that the addition of bevacizumab significantly improved progression-free survival (PFS).
  • Among 66 patients evaluated, the median PFS for chemotherapy alone was 3.1 months compared to 8.9 months when combined with bevacizumab, suggesting that this combination therapy could be more beneficial for patients.
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Cardiac fibrosis is a common pathological feature of cardiovascular diseases that arises from the hyperactivation of fibroblasts and excessive extracellular matrix (ECM) deposition, leading to impaired cardiac function and potentially heart failure or arrhythmia. Extracellular vesicles (EVs) released by cardiomyocytes (CMs) regulate various physiological functions essential for myocardial homeostasis, which are disrupted in cardiac disease. Therefore, healthy CM-derived EVs represent a promising cell-free therapy for the treatment of cardiac fibrosis.

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