Publications by authors named "Akitaka Yamamoto"

Article Synopsis
  • * The study found that sCLEC-2 levels were significantly elevated in patients with thrombotic or infectious diseases, especially in microvascular thrombosis (MVT), but the relationships between sCLEC-2, platelet count, and D-dimer were weak.
  • * ROC analysis indicates that combinations of sCLEC-2 with platelet count and D-dimer can effectively differentiate between thrombotic diseases like MVT and non-thrombotic conditions, making sCLEC-2 a
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  • The author expresses gratitude toward Dr. Ishikura for his thoughtful remarks.
  • The acknowledgment highlights the positive impact of Dr. Ishikura's comments.
  • This appreciation suggests a collaborative or respectful relationship between the author and Dr. Ishikura.
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Background Tele-ICUs are increasingly being used in the US. In Japan, young physicians mainly operate rural community hospitals to manage severely ill patients. However, the introduction of the tele-ICU system in Japan is still uncommon.

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Unlabelled: The scoring systems for disseminated intravascular coagulation (DIC) criteria require several adequate cutoff values, vary, and are complicated. Accordingly, a simpler and quicker diagnostic method for DIC is needed. Under such circumstances, soluble C-type lectin-like receptor 2 (sCLEC-2) received attention as a biomarker for platelet activation.

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Background: Soluble fibrin (SF) is a form of fibrinogen that is activated by thrombin and is considered to be useful for the diagnosis of the prethrombotic state or thrombosis.

Methods: Plasma levels of fibrin-related markers (FRMs), such as SF, D-dimer, fibrinogen, and fibrin degradation prioduct (FDP) levels in critically ill patients, were examined for the diagnosis of disseminated intravascular coagulation (DIC), venous thromboembolism (VTE), peripheral arterial thromboembolism (PATE), acute myocardial infarction (AMI), and acute cerebral infarction (ACI).

Results: FRMs showed the usefulness in diagnosing DIC and VTE and the cutoff values of D-dimer, FDP, and SF for DIC were 7.

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The present study aimed to identify useful biomarkers to predict deterioration in patients with coronavirus disease 2019 (COVID‑19). A total of 201 COVID‑19 patients were classified according to their disease severity into non‑severe (n=125) and severe (n=76) groups, and the behavior of laboratory biomarkers was examined according to the prognosis. Neutrophil count, aspartate aminotransferase (AST), alanine aminotransferase, lactate dehydrogenase (LDH), C‑reactive protein (CRP), sialylated carbohydrate antigen KL‑6 (KL‑6), procalcitonin (PCT), presepsin (PSP) and D‑dimer levels were significantly higher, and lymphocyte count and platelet count were significantly lower in the non‑severe group compared with the severe group.

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Article Synopsis
  • The study investigates the link between thrombosis and platelet activation in COVID-19 patients compared to those with other infections.
  • It found that plasma levels of soluble C-type lectin-like receptor 2 (sCLEC-2) were significantly higher in COVID-19 patients, particularly in those with severe and critical cases.
  • The elevated sCLEC-2 levels indicate that COVID-19 may trigger increased platelet activation, potentially explaining the higher thrombosis risk associated with the infection.
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Introduction: Although D-dimer is a useful biomarker of thrombosis, there are many D-dimer kits, with high and low fibrinogen and fibrin degradation products (FDP)/ D-dimer ratios.

Methods: Plasma D-dimer levels were measured using three different kits in critically ill patients to examine the usefulness of such measurements for detecting the thrombotic diseases and determining the correlation with the FDP and FDP/D-dimer ratio.

Results: Although three D-dimer kits showed marked utility for diagnosing disseminated intravascular coagulation (DIC) and peripheral arterial and venous thromboembolism (PAVTE), the D-dimer levels determined using the three kits varied among diseases.

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Object: Although many Japanese patients infected with coronavirus disease 2019 (COVID-19) only experience mild symptoms, in some cases a patient's condition deteriorates, resulting in a poor outcome. This study examines the behavior of biomarkers in patients with mild to severe COVID-19.

Methods: The disease severity of 152 COVID-19 patients was classified into mild, moderate I, moderate II, and severe, and the behavior of laboratory biomarkers was examined across these four disease stages.

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Background: Acute cerebral infarction (ACI) includes cardiogenic ACI treated with anticoagulants and atherosclerotic ACI treated with antiplatelet agents. The differential diagnosis between cardiogenic and atherosclerotic ACI is still difficult.

Materials And Methods: The plasma sCLEC-2 and D-dimer levels were measured using the STACIA system.

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Disseminated intravascular coagulation (DIC) is induced by excess activation coagulation, and activated platelets are also involved in pathogenesis. Therefore, plasma levels of soluble C-type lectin-like receptor 2 (sCLEC-2), a new marker for platelet activation, can be expected as a marker of DIC in critically ill patients. Plasma levels of sCLEC-2 and D-dimer were measured using the STACIA system.

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For the construction of next-generation optical products and systems, the evolution of polariser sheets is a necessary requirement. To this end, a low-reflective wire-grid polariser (WGP) sheet for the visible light region is demonstrated, the nanowires of which consist of a sintered body of silver nanoparticle ink. The nanowires are formed by a nanoprinting process using a thermal nanoimprint method and ink filling.

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D-dimer is a biomarker of thrombosis and recently been considered to predict a poor outcome in patients with infectious diseases. Plasma D-dimer levels were measured in critically ill patients to examine their relationship with the poor outcome. The plasma D-dimer levels were markedly higher in the patients with various underlying disease especially venous thromboembolism in comparison to those without severe underlying diseases.

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Penetrating injury of the descending aorta due to accidental discharge of a nail gun.

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Case: Reversible cerebral vasoconstriction syndrome (RCVS) is an increasingly recognized and important cause of thunderclap headache. Delays in diagnosis may cause deterioration of symptoms and concomitant unnecessary investigations. However, the diagnosis of RCVS in the acute stage remains difficult.

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Case: Cortical blindness induced by hepatic encephalopathy is an extremely rare complication and its epidemiology has not been studied in great detail. We report a 63-year-old man with liver cirrhosis who developed sudden bilateral visual impairment.

Outcome: On arrival at hospital, the patient had orientation disturbance, slurred speech, and mild disturbance of consciousness with impaired vision (light sense).

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Case: A 74-year-old woman underwent computed tomography-guided transthoracic needle biopsy of a small lung mass. Immediately after the procedure, she lost consciousness. After resuscitation, her brain computed tomography scan confirmed a cerebral air embolism.

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Case: A 72-year-old man was admitted to the intensive care unit for severe pancreatitis with coagulopathy. He underwent hemodialysis catheter insertion into the internal jugular vein that subsequently leaked arterial blood; vertebral artery cannulation was suspected following a computed tomography scan.

Outcome: Under angiographic guidance, the catheter was removed, and an arteriovenous fistula was identified.

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Background: Extracorporeal cardiopulmonary resuscitation (ECPR) is being used increasingly in the emergency and critical care field in Japan. A major complication of ECPR is bleeding; however, the optimal initial heparin dose and activated coagulation time (ACT) remain unknown. The aim of this study was to assess the appropriateness of our initial anticoagulation protocol.

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Case: Aberrant right subclavian artery-esophageal fistula is a rare, but fatal, complication. A 55-year-old febrile man with a nasogastric feeding tube developed sudden massive hematemesis and shock.

Outcome: Upper endoscopy revealed an intragastric hematoma with no active bleeding observed except for oozing from an esophageal tear.

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Objectives: Restenosis or neointimal hyperplasia remains an important complication after carotid artery stenting (CAS) for carotid artery stenosis. The purpose of this study was to examine if an anti-hypertensive drug, angiotensin receptor blocker (ARB), prevents post-CAS neointimal hyperplasia during the first 1-year period after CAS, and to clarify the possible mechanisms.

Methods: Hypertension had been treated with a calcium channel blocker (CCB) and/or an ARB, valsartan, by the preference of the neurosurgeon in charge in our department.

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Article Synopsis
  • * After a catered meal, 94 out of 358 people experienced vomiting and diarrhea, with symptoms appearing 1-9 hours post-ingestion of raw contaminated olive flounder.
  • * There has been a noticeable rise in food poisoning cases related to olive flounder in Japan, urging clinicians to be more vigilant in diagnosing such cases.
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Strongyloidiasis is a parasitic infection that occurs in tropical regions. Hyperinfection, which is an accelerated autoinfection, is often associated with an immunosuppressive state, such as HTLV-1 infection or steroid use. Immunosuppression can also lead to reactivation of tuberculosis infection.

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