文献一覧: Kazuma Yokota (著者)

6 0 0 0 OA A Case of Iatrogenic Dural Artery–Pial Vein Shunt Treated with Endovascular Treatment

著者: Hideaki Shigematsu Kazuma Yokota Akihiro Hirayama Takatoshi Sorimachi
出版者: The Japanese Society for Neuroendovascular Therapy
雑誌: Journal of Neuroendovascular Therapy (ISSN:18824072)
巻号頁・発行日: vol.17, no.3, pp.88-92, 2023 (Released:2023-03-20)
参考文献数: 7

Objective: A few cases of postsurgical iatrogenic arteriovenous shunts have been reported, with the arterial blood flow directly entering the pial veins. Herein, we reported a patient with a dural artery–pial vein shunt found 1 year after aneurysmal clipping.Case Presentation: A 64-year-old male presented with generalized convulsion 1 year after cerebral aneurysmal clipping. A CT showed intracerebral hemorrhage in the temporo-occipital cortex and a dural artery–pial vein shunt in proximity to the previous craniotomy center. The arterial blood flow from the deep temporal artery, the middle meningeal artery, and the anterior auricular branch of the superficial temporal artery shunted into the superficial middle cerebral vein, with evident cortical venous reflux. Embolization was performed with n-butyl-2-cyanoacrylate and completely occluded the shunt. The patient was discharged without neurological deficits.Conclusion: Endovascular liquid embolization may be an effective treatment for iatrogenic dural artery–pial vein shunt.

2023-04-09 10:13:17
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6 0 0 0 OA A Case of Iatrogenic Dural Artery–Pial Vein Shunt Treated with Endovascular Treatment

著者: Hideaki Shigematsu Kazuma Yokota Akihiro Hirayama Takatoshi Sorimachi
出版者: The Japanese Society for Neuroendovascular Therapy
雑誌: Journal of Neuroendovascular Therapy (ISSN:18824072)
巻号頁・発行日: pp.cr.2022-0058, (Released:2023-02-14)
参考文献数: 7

2023-02-17 11:57:26
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2 0 0 0 OA Microcatheter Re-shaping Using Fusion Image in Coil Embolization: A Technical Note

著者: Akihiro Hirayama Kittipong Srivatanakul Hideaki Shigematsu Kazuma Yokota Takatoshi Sorimachi Mitsunori Matsumae
出版者: The Japanese Society for Neuroendovascular Therapy
雑誌: Journal of Neuroendovascular Therapy (ISSN:18824072)
巻号頁・発行日: pp.tn.2020-0192, (Released:2021-03-09)
参考文献数: 8

Objective: We report the utility of microcatheter reshaping by referring to fusion images with 3D-DSA and microcatheter 3D images made using non-subtraction and non-contrast (non-SC) rotational images.Case Presentations: Case 1: The patient was a 74-year-old man who had an internal carotid-anterior choroidal artery bifurcation aneurysm with a tortuous proximal parent artery. The initial attempt to introduce the microcatheter into the aneurysm was unsuccessful. During this unsuccessful microcatheter introduction, we created fusion images with 3D-DSA and microcatheter 3D images by acquiring positional information of the microcatheter using the non-SC method. By reshaping the microcatheter with reference to the fusion images, the direction of the distal end of the microcatheter was reshaped to be in accordance with the long axis of the aneurysm, a shape more suitable for coiling. Case 2: The patient was a 47-year-old man who had an anterior communicating (A-com) artery aneurysm with two daughter sacs. We successfully placed two microcatheters in the direction of each sac to make more stable framing by referring to 3D fusion images after the first microcatheter was positioned. In both cases, microcatheter reshaping was necessary because of the vessel and aneurysm anatomy. We have used this technique successfully in 15 patients, for both ruptured and unruptured aneurysms. The average number of microcatheter reshaping was 1.3 times.Conclusion: This method provides effective microcatheter reshaping for coil embolization of aneurysms, particularly those with differences between the axis of the parent artery and the vertical axis of aneurysm, or with a tortuous proximal artery.

2022-03-02 10:49:18
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1 0 0 0 OA Diagnostic Tests for COVID-19 and Their Accuracy: Important Information for Physicians Caring for Patients with Stroke

著者: Akihiro Hirayama Satomi Asai Kittipong Srivatanakul Kazuma Yokota Hideaki Shigematsu Takatoshi Sorimachi Mitsunori Matsumae
出版者: The Japanese Society for Neuroendovascular Therapy
雑誌: Journal of Neuroendovascular Therapy (ISSN:18824072)
巻号頁・発行日: vol.15, no.8, pp.484-488, 2021 (Released:2021-08-20)
参考文献数: 17

Coronavirus disease 2019 (COVID-19) is caused by severe acute respiratory syndrome coronavirus 2 (SAR-CoV-2), which appeared at the end of 2019 and has spread rapidly worldwide. In Japan, the increasing number of people infected with SAR-CoV-2 is also a cause of concern for physicians managing stroke patients. From the perspective of viral transmission in the hospital, stroke physicians must determine whether patients who have been transported by emergency have confirmed or suspected COVID-19. For this reason, stroke physicians must also understand about the characteristics and accuracy of the test for COVID-19 diagnosis. This article describes the sensitivity of the clinical symptoms, imaging investigations such as chest radiography and chest CT, and accuracy of nucleic-acid amplification tests and antigen tests used in the diagnosis of COVID-19. However, it should be noted that the accuracy of specimen tests may change depending on the collection site, timing, and method, because positive results in these tested specimens depend on the viral loads. In performing medical treatment for stroke, high accuracy and rapid inspection for COVID-19 is desired, but this is not currently available. For acute stroke treatment, such as thrombectomy, we recommend that these emergency patients, who are suspected of COVID-19 by clinical symptoms and image investigations, should be treated with implementation of strict infection control against droplets, contact, and airborne transmission until the most sensitive polymerase chain reaction test result is confirmed as negative.

2022-02-07 23:29:16
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