Research Topics
| Yasunari OtawaraSummaryAffiliation: University of Tokyo Country: Japan Publications
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Detail Information
Publications
Dissecting aneurysms of the bilateral vertebral arteries with subarachnoid hemorrhage: report of three casesYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Uchimaru, Morioka, Japan
Neurosurgery 50:1372-4; discussion 1374-5. 2002..Treatment of one side in cases of dissecting aneurysms of the bilateral vertebral arteries (VAs) with subarachnoid hemorrhage may result in dissection or rupture on the contralateral side...- Mechanical and surface properties of Yasargil Phynox aneurysm clips after long-term implantation in a patient with cerebral aneurysmYasunari Otawara
Department of Neurosurgery, Iwate Medical University, 19 1 Uchimaru, Morioka, Iwate, 020 8505, Japan
Neurosurg Rev 32:193-6; discussion 196-7. 2009.... - Effect of continuous cisternal cerebrospinal fluid drainage for patients with thin subarachnoid hemorrhageYasunari Otawara
Department of Neurosurgery, Iwate Medical University, 19 1 Uchimaru, Morioka, Iwate 020 8505, Japan
Vasc Health Risk Manag 3:401-4. 2007..All patients in both groups resulted in good recovery. Postoperative cisternal CSF drainage does not affect the incidence of cerebral vasospasm or the clinical outcome in patients with thin SAH... - Intracerebral hemorrhage after prophylactic revascularization in a patient with adult moyamoya diseaseYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Iwate, 020 8505 Japan
Surg Neurol 68:335-7; discussion 337. 2007..The effect of revascularization surgery for a patient with moyamoya disease remains controversial... - Reliability of cobalt-chromium alloy aneurysm clips after long-term implantations in patients with cerebral aneurysmsYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Tokyo, Japan
J Neurosurg 105:713-6. 2006..In this study the authors evaluated the mechanical properties and surface elemental composition of Co-Cr alloy aneurysm clips implanted for more than 10 years in patients with cerebral aneurysms... - Comparison of postoperative cognitive function in patients undergoing surgery for ruptured and unruptured intracranial aneurysmYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Iwate 020 8505, Japan
Surg Neurol 72:592-5; discussion 595. 2009..The present study excluded the effects of surgery by comparing cognitive function after surgical repair in patients with aneurysmal SAH and patients with unruptured intracranial aneurysm... - Cognitive function before and after surgery in patients with unruptured intracranial aneurysmYasunari Otawara
Department of Neurosurgery, Iwate Medical University, 19 1 Uchimaru, Morioka, 020 8505 Japan
Stroke 36:142-3. 2005..This prospective study investigated whether surgery for unruptured intracranial aneurysms (UIAs) affects cognitive function and cerebral blood flow (CBF)... - Evaluation of vasospasm after subarachnoid hemorrhage by use of multislice computed tomographic angiographyYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Neurosurgery 51:939-42; discussion 942-3. 2002.... - Postoperative cortical neural loss associated with cerebral hyperperfusion and cognitive impairment after carotid endarterectomy: 123I-iomazenil SPECT studyKohei Chida
Department of Neurosurgery, School of Medicine, Iwate Medical University, Morioka, Iwate, Japan
Stroke 40:448-53. 2009.... - Early post-ischemic hyperemia on transcranial cerebral oxygen saturation monitoring in carotid endarterectomy is associated with severity of cerebral ischemic insult during carotid artery clampingMasakazu Kobayashi
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Neurol Res 31:728-33. 2009.... - Prediction of cerebral hyperperfusion after carotid endarterectomy using middle cerebral artery signal intensity in preoperative single-slab 3-dimensional time-of-flight magnetic resonance angiographyHiroki Kuroda
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Neurosurgery 64:1065-71; discussion 1071-2. 2009..The purpose of the present study was to determine whether the signal intensity of the MCA on preoperative MRA could identify patients at risk for cerebral hyperperfusion after CEA... - Magnetic resonance imaging in patients with cerebral hyperperfusion and cognitive impairment after carotid endarterectomyRyounoshin Hirooka
Department of Neurosurgery, Tochinai Daini Hospital, Morioka, Japan
J Neurosurg 108:1178-83. 2008..The purpose of the present study is to investigate structural brain damage seen on magnetic resonance (MR) images obtained in patients with cerebral hyperperfusion and cognitive impairment after CEA... - Preoperative single-slab 3D time-of-flight magnetic resonance angiography predicts development of new cerebral ischemic events after carotid endarterectomy. Clinical articleTaro Suzuki
Department of Neurosurgery, Advanced Medical Center, Iwate Medical University, Morioka, Japan
J Neurosurg 111:141-6. 2009..The purpose of the present study was to determine whether, on preoperative MR angiography, the signal intensity of the MCA can be used to identify patients at risk for development of cerebral ischemic events after CEA... - Preoperative cerebral hemodynamic impairment and reactive oxygen species produced during carotid endarterectomy correlate with development of postoperative cerebral hyperperfusionYasunori Suga
Department of Neurosurgery, School of Medicine, Iwate Medical University, 19 1 Uchimaru, Morioka, Iwate 020 8505, Japan
Stroke 38:2712-7. 2007.... - Significance of postoperative crossed cerebellar hypoperfusion in patients with cerebral hyperperfusion following carotid endarterectomy: SPECT studyKuniaki Ogasawara
Department of Neurosurgery, Iwate Medical University, 19 1 Uchimaru, Morioka, 020 8505, Japan
Eur J Nucl Med Mol Imaging 35:146-52. 2008.... - Treatment of vertebral artery aneurysms with transposition of the posterior inferior cerebellar artery to the vertebral artery combined with parent artery occlusion. Technical noteKuniaki Ogasawara
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
J Neurosurg 105:781-4. 2006.... - Treatment of ruptured spontaneous saccular aneurysm in the central artery of the middle cerebral artery using bypass surgery combined with trapping - case report - Hideo Saito
Department of Neurosurgery, Iwate Medical University, Morioka, Iwate, Japan
Neurol Med Chir (Tokyo) 47:471-4. 2007..The present case shows that a spontaneous saccular aneurysm can develop at the cortical segment of the MCA, and can be successfully treated with bypass surgery combined with trapping... - Intraoperative microemboli and low middle cerebral artery blood flow velocity are additive in predicting development of cerebral ischemic events after carotid endarterectomyKuniaki Ogasawara
Department of Neurosurgery, School of Medicine, Iwate Medical University, Morioka, Japan
Stroke 39:3088-91. 2008..The purpose of this study was to determine whether these events correlate with middle cerebral artery blood flow velocity... - Cognitive function and anxiety before and after surgery for asymptomatic unruptured intracranial aneurysms in elderly patientsYoshitaka Kubo
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
World Neurosurg 73:350-3. 2010..The goal of the present study was to prospectively assess cognitive function and anxiety before and after surgical repair of asymptomatic UIAs in patients ? 70 years... - Anxiety before and after surgical repair in patients with asymptomatic unruptured intracranial aneurysmYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Surg Neurol 62:28-31; discussion 31. 2004..Anxiety of patients with asymptomatic unruptured intracranial aneurysm may deserve attention in deciding whether to treat the aneurysm... - Preoperative cerebrovascular reactivity to acetazolamide measured by brain perfusion SPECT predicts development of cerebral ischemic lesions caused by microemboli during carotid endarterectomyKenta Aso
Department of Neurosurgery, Iwate Medical University, 19 1 Uchimaru, Morioka, 020 8505, Japan
Eur J Nucl Med Mol Imaging 36:294-301. 2009.... - Concentration of matrix metalloproteinase-9 in the jugular bulb during carotid endarterectomy correlates with severity of intraoperative cerebral ischemiaDaiya Ishigaki
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Cerebrovasc Dis 25:587-92. 2008..The goal of this study was to determine whether plasma concentrations of MMP-9 in the jugular bulb during carotid endarterectomy (CEA) correlate with severity of intraoperative cerebral ischemia... - Microsurgical removal of previously placed aneurysm clips and application of new clips for recurrent cerebral aneurysms. Technical noteHiroshi Kashimura
Department of Neurosurgery, Iwate Medical University School of Medicine, Morioka, Iwate, Japan
J Neurosurg 107:881-3. 2007..The present technique is a useful procedure for treatment of regrown or reruptured cerebral aneurysms occurring a significantly long time after initial clipping of an aneurysm neck... - Brain temperature and cerebral blood flow imaging in patients with severe subarachnoid hemorrhage: report of two casesYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Surg Neurol 60:549-52; discussion 552. 2003..These patients died within 2 to 3 days. CONCLUSIONS: Temperature reversal may indicate the exact time when absence of brain perfusion occurs, causing irreversible brain damage... - Mechanical characteristics and surface elemental composition of a Yasargil titanium aneurysm clip after long-term implantationYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
J Neurosurg 112:1260-2. 2010..Titanium oxide and calcium were identified on the surface of the retrieved clip, which indicated the formation of corrosion-resistant layers. Titanium-alloy clips retain their mechanical properties in the human cranium for a long time... - Wrap-clipping with polytetrafluoroethylene for ruptured blisterlike aneurysms of the internal carotid artery. Technical noteYoshitaka Kubo
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
J Neurosurg 105:785-7. 2006..quot;Wrap-clipping" using PTFE is a useful procedure for management of ruptured blisterlike aneurysms of the ICA... - Treatment of vertebral artery aneurysms with posterior inferior cerebellar artery-posterior inferior cerebellar artery anastomosis combined with parent artery occlusionShunsuke Kakino
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Surg Neurol 61:185-9; discussion 189. 2004..CONCLUSION: PICA-PICA anastomosis is a useful procedure for reconstruction of the PICA when parent vessel occlusion or trapping is necessary to exclude a VA aneurysm involving the origin of the PICA... - Revascularization and parent artery occlusion for giant internal carotid artery aneurysms in the intracavernous portion using intraoperative monitoring of cerebral hemodynamicsYoshitaka Kubo
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Neurosurgery 58:43-50; discussion 43-50. 2006.... - Hemorrhagic infarction at 33 days after birth in a healthy full-term neonateYoshitaka Kubo
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Vasc Health Risk Manag 7:667-70. 2011..Patent foramen ovale may have been present and this may have led to spontaneous paradoxical cerebral embolism followed by hemorrhagic infarction... - Application of fenestrated aneurysm clip for incomplete clamping of the common carotid artery during carotid endarterectomy: technical noteMasakazu Kobayashi
Department of Neurosurgery, Iwate Medical University, Morioka, Iwate, Japan
Neurol Med Chir (Tokyo) 49:225-6; discussion 226-7. 2009.... - Ruptured vertebral artery dissecting aneurysm followed by spontaneous acute occlusion and early recanalization: case reportHidehiko Endo
Department of Neurosurgery, Iwate Medical University, Morioka, Iwate, Japan
Neurol Med Chir (Tokyo) 45:400-3. 2005..Serial neurological and neuroradiological examinations are essential to decide the timing and method of treatment... - Improvement and impairment in cognitive function after carotid endarterectomy: comparison of objective and subjective assessmentsKoji Yoshida
Department of Neurosurgery, Iwate Medical University
Neurol Med Chir (Tokyo) 52:154-60. 2012.... - Concentration of malondialdehyde-modified low-density lipoprotein in the jugular bulb during carotid endarterectomy correlates with development of postoperative cognitive impairmentHideo Saito
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Neurosurgery 60:1067-73; discussion 1073-4. 2007.... - [A case report of ruptured internal carotid artery aneurysm with contralateral oculomotor nerve paresis]Gundai Saito
Department of Neurosurgery, Iwate Prefectural Senmaya Hospital, Higashiiwai gun, Japan
No Shinkei Geka 33:365-8. 2005..Ruptured right internal carotid artery aneurysm was surgically confirmed and repaired. We speculated that the contralateral oculomotor nerve paresis was the consequence of bloody jet flow from the ruptured aneurysm... - Prediction of meningioma consistency using fractional anisotropy value measured by magnetic resonance imagingHiroshi Kashimura
Department of Neurosurgery, Iwate Medical University School of Medicine, Morioka, Iwate, Japan
J Neurosurg 107:784-7. 2007..In the present study the authors aimed to determine whether the fractional anisotropy (FA) value calculated on the basis of preoperative magnetic resonance (MR) diffusion tensor (DT) imaging could predict meningioma consistency... - [A case report of sphenoidal encephalocele presenting with cerebral spinal fluid rhinorrhea]Masaru Takeda
Department of Neorosurgery, Iwate Medical University, 19-1 Uchimaru, Morioka-city, Iwate 020-8505, Japan
No Shinkei Geka 32:37-41. 2004..We diagnosed the lesion as sphenoidal encephalocele. Surgical repair and amputation of the encaphalocele was performed. Sphenoidal encaphalocele should be considered as a possible diagnosis for recurrent fever and rhinorrhea... - Brain and systemic temperature in patients with severe subarachnoid hemorrhageYasunari Otawara
Department of Neurosurgery, Iwate Medical University, Morioka, Japan
Surg Neurol 60:159-64; discussion 164. 2003..The other 10 patients survived with various degrees of disability. CONCLUSIONS: Observation of BT and ST can predict the outcome of severe subarachnoid hemorrhage...