Publications by authors named "Osanai Hiroyuki"

Background: The distribution of anti-factor Xa activity (AXA) in patients with nonvalvular atrial fibrillation (NVAF) taking edoxaban 15 mg has not been fully elucidated.

Methods And Results: The trough and peak AXA were measured in 19 NVAF patients taking edoxaban 15 mg. We compared these results with those in patients taking edoxaban 30 mg.

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Objective: Hypoxia-inducible factor prolyl hydroxylase (HIF-PH) inhibitors are a new class of anti-anemia agents. We retrospectively evaluated the safety and efficacy of HIF-PH inhibitors in patients with heart failure (HF) complicated by anemia associated with chronic kidney disase. HIF-PH inhibitor treatment was initiated in 32 patients with chronic HF complicated by renal anemia and were followed up for 3 months.

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Ultra-high-density mapping was used for potential-guided radiofrequency ablation for typical atrioventricular nodal reentrant tachycardia. The mapping detailed the spread of activation in the Koch's triangle and identified target potentials and tachycardia circuits. This mapping provides additional information to the slow pathway conventionally used for safe and effective ablation.

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Introduction: The efficacy of catheter ablation in patients with low cardiac function has been previously reported; however, only a few studies have included mid-range ejection fraction (mrEF). This study aimed to evaluate the efficacy and safety of atrial fibrillation (AF) ablation in patients with left ventricular ejection fraction (LVEF) < 50%.

Methods: This study retrospectively analyzed 79 patients (reduced ejection fraction [rEF]/mrEF, 38/41; paroxysmal/persistent, 37/42; heart failure hospitalizations within one year before ablation, 36 [45.

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Purpose: The CARTOFINDER mapping system analyzes activation patterns using unipolar potentials during atrial fibrillation (AF), where isoproterenol (ISP) is conventionally used to induce non-pulmonary vein (PV) foci and confirm PV arrhythmogenicity. In 20 patients with persistent AF who underwent ablation at our hospital, arrhythmogenic foci were evaluated using both these methods.

Methods: Before pulmonary vein isolation (PVI), PV and left atrium (LA) were analyzed during AF using CARTOFINDER, and the isolation line was determined based on the results.

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Purpose: Compared with conventional pulmonary vein isolation (PVI) with radiofrequency ablation, PVI with cryoballoon is an easier and shorter procedure without reconnection, particularly in the superior pulmonary vein. However, the durability of the cryoballoon may be reduced due to anatomical factors and the position of the pulmonary vein (PV). Further, inadequate isolation of the carina leads to recurrence of atrial fibrillation (AF).

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Ultra-high-resolution mapping is useful in the ablation of accessory pathways. However, in patients with accessory pathways in the coronary sinus (CS) diverticulum, treatment with endocardial ablation may be challenging. Patients suspected of having subepicardial accessory pathways may require the examination of the venous anomaly using CS angiography.

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Article Synopsis
  • The case discusses a patient who experienced dissection of the external iliac arteries on both sides, linked to emotional stress.
  • Doctors should consider this condition when young and healthy individuals report lower back pain following stressful emotional events.
  • Isolated bilateral external iliac artery dissections are rare and highlight the connection between emotional health and physical ailments.
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Cardiac involvement of malignant lymphoma is relatively common, although such a phenomenon has subclinical manifestations that are difficult to detect. We herein describe a patient with atrial fibrillation and sick sinus syndrome as the main symptoms. Computed tomography showed a mass in the right atrium extending into the superior vena cava (SVC).

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We treated a patient with PCCD whose single left AT appeared as two different types on preoperative surface and intracardiac ECG from a pacemaker. The diagnosis was hindered by the fact that the conduction block encompassed interatrial block and the pacemaker A-wave was captured at the right atrial appendage.

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Background: Catheter ablation for atrial fibrillation (AF) is an established therapy. However, postoperative recurrence is a serious issue caused by the reconduction of the isolated pulmonary veins (PV) and the onset of non-PV foci. The objectives of this study were to elucidate dormant conduction, confirm PV arrhythmia substrate, induce non-PV foci after PV isolation, and assess the acute efficacy of high dose isoproterenol (ISP) when administered in addition to adenosine.

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Intraoperative identification of the parathyroid gland is very important during thyroid and parathyroid surgery.Recently, intrinsic fluorescence of the parathyroid gland was identified and reported.We report the case of a 45-year-old woman with thyroid papillary cancer.

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Article Synopsis
  • Factor-Xa inhibitors (FXaIs) like rivaroxaban, apixaban, and edoxaban are commonly used for treating non-valvular atrial fibrillation (NVAF), but their effectiveness varies in patients with renal impairment (RI).
  • The study measured anti-factor Xa activity (AXA) in a sample of patients with varying degrees of RI, comparing results across different FXaIs, specifically noting significant differences in AXA values between those with moderate and severe RI.
  • Results indicated that in patients on rivaroxaban, severe RI correlated with higher peak AXA values, while apixaban showed no significant variation between RI levels, and edoxaban had higher trough values in severe RI, highlighting the need for
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Background: It is known that once heart failure occurs in older patients with diabetes, the overall prognosis is extremely poor. We investigated whether early initiation of SGLT2 inhibitor therapy after admission was beneficial for diabetic patients requiring inpatient treatment for acute heart failure.

Methods: We retrospectively assessed consecutive patients with comorbid diabetes who were admitted to the Department of Cardiology in Tosei General Hospital for treatment of acute heart failure.

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  • Dabigatran, a thrombin inhibitor used to reduce stroke risk in non-valvular atrial fibrillation patients, shows altered blood concentration levels when combined with proton pump inhibitors (PPIs).
  • PPI co-administration resulted in significantly lower average trough and peak dabigatran concentrations in patients, indicating a potential reduction in drug effectiveness.
  • Clinicians should be cautious when prescribing PPIs alongside dabigatran due to the observed decrease in drug bioavailability, which may affect patient outcomes.
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Aim: Sodium-glucose cotransporter 2 (SGLT2) inhibitors are antidiabetic agents that act on the proximal renal tubules to lower blood glucose levels by inhibiting glucose reabsorption and promoting urinary glucose excretion. The present study assessed the long-term use of SGLT2 inhibitors in older patients with diabetes.

Methods: A total of 117 older patients with type 2 diabetes who were given SGLT2 inhibitors were enrolled from April 2014 to March 2016.

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Article Synopsis
  • The study examined anti-Xa activity (AXA) in 94 patients with nonvalvular atrial fibrillation (NVAF) on rivaroxaban, highlighting the connection between AXA levels and bleeding events.
  • The mean peak AXA level was significantly higher than trough levels, and variations were noted based on kidney function (creatinine clearance) among patients.
  • Patients with higher peak AXA levels experienced more bleeding events, indicating that peak AXA is an independent predictor of bleeding in this group.
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Background: Lentinan (LNT) is a purified β-1, 3-glucan that augments immune responses. The present study was conducted to assess the efficacy of LNT in combination with S-1 as a first-line treatment for unresectable or recurrent gastric cancer.

Patients And Methods: Eligible patients were randomly assigned to receive S-1 alone or S-1 plus LNT.

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Article Synopsis
  • The study examines anti-factor Xa activity (AXA) levels in patients with non-valvular atrial fibrillation (NVAF) undergoing edoxaban treatment.
  • The measurement of AXA values revealed no significant differences in trough and peak levels between patients taking 60 mg and 30 mg doses of edoxaban.
  • The findings suggest that adhering to the recommended dosing is crucial to ensure the medication's effectiveness.
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Background: Chromogenic anti-factor Xa activity (AXA) assay is reported to be the most appropriate method to measure the pharmacodynamics of apixaban, but the distribution of AXA in non-valvular atrial fibrillation (NVAF) patients on apixaban therapy has not been fully elucidated.

Methods and results: Steady-state trough and peak AXA were measured in 124 NVAF patients taking apixaban. In 25 patients, baseline, first peak, and trough AXA were also examined, and were 0.

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Although reports suggest that tolvaptan does not reduce survival or subsequent hospitalization rates in heart failure patients, its continuous use has shown good outcomes in some patients who cannot be effectively managed with high doses of loop diuretics. Therefore, we investigated the association of patient characteristics and continued tolvaptan use in heart failure patients with changes in the frequency and annual duration of patient hospitalization due to heart failure. We carefully reviewed the medical records of patients hospitalized due to heart failure who began tolvaptan therapy and continued with outpatient treatment between December 2010 and November 2013 (tolvaptan group); patients hospitalized for heart failure between May 2008 and March 2009 served as controls.

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Bacteria isolated from surgical infections during the period from April 2011 to March 2012 were investigated in a multicenter study in Japan, and the following results were obtained. In this series, 785 strains including 31 strains of Candida spp. were isolated from 204 (78.

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Bacteria isolated from surgical infections during the period from April 2010 to March 2011 were investigated in a multicenter study in Japan, and the following results were obtained. In this series, 631 strains including 25 strains of Candida spp. were isolated from 170 (81.

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Article Synopsis
  • Rivaroxaban is used to prevent strokes in patients with atrial fibrillation, and understanding coagulation function can help assess the drug's effects and bleeding risks.
  • The study involved 136 patients, with a focus on 84 for prothrombin times (PTs) and soluble fibrin (SF) levels, showing significant differences between peak and trough measurements.
  • Findings suggest that a peak PT of 20 seconds or more increases bleeding risks, and both PT and SF levels are essential for monitoring patients on rivaroxaban, regardless of their previous anticoagulant use.
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Bacteria isolated from surgical infections during the period from April 2009 to March 2010 were investigated in a multicenter study in Japan, and the following results were obtained. In this series, 671 strains including 16 strains of Candida spp. were isolated from 174 (79.

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