Publications by authors named "Ryu Kimura"

Aim: The association between out-of-hospital cardiac arrest (OHCA) and the appropriate provision of public access defibrillation (PAD) remains unclear. This study aimed to evaluate the factors associated with whether or not PAD was provided.

Methods: This retrospective cohort study utilized the All-Japan Utstein and Emergency Transport Registries in 2021.

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Intracranial artery dissections (IADs), although uncommon, are an important cause of cerebral infarction and subarachnoid hemorrhage (SAH). Some IADs can heal spontaneously after reconstitution of the vessel lumen with excellent prognosis. Meanwhile, others can progress to stroke that requires treatment.

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Several studies have reported the importance of preoperative simulations. This report describes the methods and utility of neuroendovascular treatment using a three-dimensional(3D)-printed hollow cerebral aneurysm model. This model was created using a stereolithography apparatus-type 3D printer with digital imaging and communications in medicine data from 3D digital subtraction angiograms.

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Article Synopsis
  • Renal autotransplantation is a rare surgery for preserving kidney function in patients with complex urinary issues or tumors.
  • Between 2012 and 2023, four patients underwent ex vivo partial nephrectomy and autotransplantation for complex renal tumors, with no significant postoperative complications.
  • Though renal function slightly decreased one month after surgery, it stabilized by the three-month mark, and all patients showed no recurrence or metastasis of tumors at the latest follow-up.
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Background: Endovascular treatment is the mainstay of treatment for carotid-cavernous fistulas, but endovascular approaches vary widely. The authors report a rare case of a direct carotid-cavernous fistula with cranial nerve symptoms caused by rupture of a giant aneurysm in which selective transvenous embolization via the pterygoid plexus was performed.

Observations: An 81-year-old man presented with headache and various progressive cranial nerve symptoms due to a direct carotid-cavernous fistula caused by a ruptured giant aneurysm.

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Objective: In recent years, endovascular treatment has become the treatment of choice for distal anterior cerebral artery (DACA) aneurysms. In this study, we report the outcomes of coil embolization for DACA aneurysms.

Methods: Eighteen DACA aneurysms in 16 patients treated with endovascular treatment between January 2010 and December 2020 were included in this study.

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Background And Purpose: The lateral spinal artery (LSA) perfuses the dorsolateral part of the spinal cord at the craniocervical junction (CCJ). We analyzed the angioarchitecture of the normal LSA and CCJ arteriovenous fistula (AVF).

Methods: The first study included 26 patients with a cerebral aneurysm of the posterior circulation.

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Article Synopsis
  • - The study aims to compare the medical costs associated with active surveillance versus treatments like robot-assisted laparoscopic prostatectomy, brachytherapy, radiation therapy, and hormone therapy for low-risk prostate cancer.
  • - An analysis of costs over the first five years for various therapies showed that active surveillance is significantly cheaper, with total costs coming to $1.65 million compared to much higher costs for other treatments (e.g., $14 million for surgery).
  • - The findings suggest that if more patients (50% or 100%) chose active surveillance initially, up to $13.8 million could be saved in total treatment costs, highlighting the potential for cost savings in expanding this approach.
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Objective: The morphological changes of the pipeline embolization device (PED; Medtronic, Minneapolis, MN, USA), such as delayed migration or foreshortening, can relate to the incomplete occlusion of aneurysms.

Case Presentation: A 30-year-old man with a giant cavernous carotid artery aneurysm was treated with two PEDs using the overlapping technique. Six months after treatment, follow-up angiography showed morphological changes of the PEDs and residual flow into the aneurysm.

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Objective: To assess the ability of the "wall-carving (WC) image technique", which uses vascular images from 3-dimensional digital subtraction angiograms (3DDSAs). Also, to verify the accuracy of the resulting 3D-printed hollow models of intracranial aneurysms.

Methods: The 3DDSA data from 9 aneurysms were processed to obtain volumetric models suitable for the stereolithography apparatus.

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Aims: We examined age-associated changes in bladder and urethral coordination involving the nitric oxide (NO)/soluble guanylyl cyclase (sGC) system, which induces urethral smooth muscle relaxation, and urethral ischemic/oxidative stress changes in rats.

Main Methods: Sixteen female Sprague-Dawley rats were divided into young (3 months old) and middle-aged (12-15 months old) groups. Urethral activity was evaluated by simultaneously recording intravesical pressure under isovolumetric conditions and urethral perfusion pressure (UPP) under urethane anesthesia.

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We developed a new cranioplasty method that utilizes artificial bone made of ultra-high-molecular-weight polyethylene, with a wedge-shaped edge (UHMWPE Wing). This study shows the methods and data of case series and finite element analyses with the UHMWPE Wing. A circumferential wing was preoperatively designed for a custom-made artificial bone made of UHMWPE to achieve high fixed power and to minimize the usage of cranial implants.

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To confirm changes in urethral activity with age, both intravesical pressure and urethral perfusion pressure (UPP) were recorded and external urethral sphincter electromyography (EUS-EMG) was performed. A total of 33 female Sprague Dawley rats aged 3 months (young rats), 12 months (middle-aged rats), and 24 months (aged rats) were used. Bladder activity was evaluated using continuous cystometry.

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Aims: We examined the efficacy of tramadol on the urethral reflex during sneezing, as well as the role of µ-opioid receptors in the spinal cord, in rats.

Methods: Forty-one female Sprague-Dawley rats were used. The rats were divided into normal female rats and rats with vaginal distension (VD), which mimics stress urinary incontinence (SUI) in humans.

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Aims: We aimed to investigate the age-associated changes in movement coordination between the urinary bladder and the urethra in rats.

Methods: A total of 17 female Sprague-Dawley rats were used. The rats were divided into young (3 months old) and middle-aged (12-15 months old) groups.

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Modifications of low-density lipoprotein (LDL), such as oxidation and aggregation, and angiotensin (Ang) peptides are involved in the pathogenesis of atherosclerosis. Here, we investigated the relationship between one of the Ang peptides, AngII, and two LDL modifications, oxidation and aggregation. Using polyacrylamide gel electrophoresis and aggregation assays, we noted that AngII markedly induced the aggregation of LDL and oxidized LDL (Ox-LDL), and bound to both the aggregated and non-aggregated forms.

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Two oxidized forms of low-density lipoprotein (LDL), oxidized LDL (ox-LDL) and minimally modified LDL (MM-LDL), are believed to play a major role in the pathogenesis of atherosclerosis. Recently, we reported that a heptapeptide (Lys-Trp-Tyr-Lys-Asp-Gly-Asp, KP6) coupled through the ε-amino group of N-terminus Lys to fluorescein isothiocyanate, (FITC)KP6, bound to ox-LDL but not to LDL. In the present study, we investigated whether (FITC)KP6 could be used as a fluorescent probe for the specific detection of MM-LDL and ox-LDL.

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Objective: Laparoscopic adrenalectomy is generally performed by either a transperitoneal approach (TA) or a retroperitoneal approach (RA). However, the optimal selection criteria for each approach are unclear. We investigated the factors affecting the safety of laparoscopic adrenalectomy to evaluate the optimal criteria for each approach.

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We report a case of primary mucosa-associated lymphoid tissue (MALT)-type lymphoma of the urinary bladder, which temporarily regressed after antibiotic therapy and progressed 1 year after the treatment. The patient was a 72-year-old female with a history of recurrent cystitis. She was referred to our hospital for microscopic hematuria.

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Article Synopsis
  • Cisplatin (CDDP) can cause renal impairment, notably through renal salt wasting syndrome (RSWS), which is uncommon but resembles the syndrome of inappropriate secretion of antidiuretic hormone (SIADH).
  • A case study involved a 72-year-old man with bladder cancer who developed RSWS after receiving CDDP and gemcitabine, leading to severe symptoms like hyponatremia and renal dysfunction.
  • Treatment included administering normal saline to address his low sodium levels and hypotension, and after diagnosis, the decision was made to switch from chemotherapy to total cystectomy; he has since remained free from cancer recurrence.
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Objectives: The possible relationship between urological disease and inferior vena cava (IVC) reflux was examined.

Methods: Transabdominal color Doppler ultrasonography of the IVC was performed. The patient was placed supine and the convex probe was positioned in vertical to the upper abdominal wall.

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