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Katsuya Saito,Takakazu Ushioda,Takahiro Miyata,Keita Mayanagi,Koki Kato,Joji Inamasu,Masashi Nakatsukasa 대한뇌혈관외과학회 2023 Journal of Cerebrovascular and Endovascular Neuros Vol.25 No.3
We describe a rare case of sacral epidural arteriovenous fistulas (edAVFs) with atypical clinical course of treatment. A 78-year-old man with a history of spinal surgery presented progressive gait disturbance and urinary incontinence. Spinal angiography demonstrated a sacral spinal AVF fed by bilateral lateral sacral arteries, draining to the venous pouch with subdural drainage. The first treatment by direct interruption of a subdural drainer was incompletely finished. Postoperative reassessment by 3D imaging analysis led to the diagnosis of sacral edAVF and 3D understanding of its angioarchitecture. The second treatment by transarterial embolization (TAE) resulted in complete occlusion of a sacral edAVF. However, spinal venous congestion didn’t improve, because the recruitment of occult edAVFs at the multiple lumbar levels and complex-shaped sacral ventral epidural venous plexus (VEP) were involved in the remnant of prior subdural drainage. The third treatment was performed by TAE for three occult edAVFs and the VEP compartment connecting between a patent edAVF and subdural drainage, which resulted in complete disappearance of spinal cord edema. Endovascular embolization of VEP compartment connecting to subdural drainage in addition to fistulous occlusion may be one of the treatment options for several edAVFs at the multiple spinal levels.
Pressure-enhanced Giant Magnetoresistance in Fe/Cr Magnetic Multilayers
Gendo Oomi,Shuhei Higashihara,Kazufumi Suenaga,Kesami Saito,Koki Takanashi,Seiji Mitani 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetoresistance of Fe/Cr magnetic multilayers (MMLs) on the 1st and the 2nd peakshas been measured at high pressure up to 3 GPa at low temperature in order to make clear thecharacteristics of the giant magnetoresistance (GMR) under high pressure. The GMRs of the MMLson the 2nd peak are found to be enhanced strongly by applying pressure whereas those of 1st peakMMLs decrease with increasing pressure. The magnitude of GMR of the 2nd peak MMLs becomesabout twice or more at 2 GPa compared with the value at ambient pressure. The large differencein the pressure dependences is explained by assuming a pressure-induced crossover in the interlayerexchange coupling from the biquadratic to the bilinear spin arrangements.