Clipping surgery for aneurysmal subarachnoid hemorrhage in patients aged 75 years or older

Objective: The incidence rate of aneurysmal subarachnoid hemorrhage (SAH) in the elderly is increasing. Although endovascular coiling has become a major form of treatment for SAH in elderly patients, not all ruptured aneurysms can be managed with an endovascular approach. Conventional surgical clipping still plays an important role in SAH treatment. The present study was performed to assess the outcome in patients older than 75 years of age in whom ruptured aneurysms were treated by clipping surgery. Methods: This retrospective study included patients 75 years of age or older who underwent clipping surgery for ruptured cerebral aneurysms between 1988 and 2009. Age, gender, preoperative grade, Fisher grade, size, and location of the ruptured aneurysm were compared between cases showing favorable and unfavorable outcomes. Results: A total of 333 patients were analyzed. There were significant differences in preoperative grade, Fisher grade, and location of the aneurysm between the favorable and unfavorable outcome groups. In multivariate logistic regression analysis, independent predictors of unfavorable outcome were poor grade and ruptured anterior cerebral artery aneurysm, but not age of 80 years or older. Conclusions: Advanced age did not represent a risk factor for poor outcome of clipping surgery in elderly patients. Although coil embolization has been shown to be a useful form of treatment, direct surgery should also be considered.ArticleNEUROLOGICAL RESEARCH. 33(8):853-857 (2011)journal articl

Effects of Subtype-selective E Prostanoid Receptor Agonists on Bleomycin-induced Pulmonary Fibrosis in Rats

Article信州医学雑誌 67(3): 183-195(2019)journal articl

Scissoring of cerebral aneurysm clips: mechanical endurance of clip twisting

Although the cerebral aneurysm clip "scissoring" phenomenon is known to occur due to twisting of the aneurysm clip blades during surgery, there have been few previous studies of scissoring. In the present study, we examined the in vitro endurance of clip twisting to assess clip scissoring. To evaluate the clip-scissoring effect, we measured torque at the rotating aneurysm clip head (Sugita and Yasargil clips) using our own manufactured product. A silicon sheet 1 mm thick was clipped at several depths (3, 6, and 9 mm), and the clip head was mechanically rotated. Straight and fenestrated clips of titanium alloy were used in the present study. Cobalt alloy straight clips were also examined. Preliminary experiments indicated that torque values during clip head rotation dropped when the blades crossed. In addition, torque values before blade crossing showed resistance to slippage of the blades. Torque values of both Sugita and Yasargil clips were directly proportional to the blade depth. There were no differences between straight and fenestrated Sugita clips. Although the torque was greater in cobalt alloy than titanium alloy Sugita clips, the torque values of Yasargil cobalt and titanium clips were identical. We found some differences in torque values during clip head rotation between Sugita and Yasargil clips. Based on the results of twisting experiments, scissoring is likely to occur when occluding the neck of the aneurysm only with the tips of long clip blades.ArticleNEUROSURGICAL REVIEW. 35(2):219-224 (2012)journal articl

Horizontal contralateral approach for the distal anterior cerebral artery aneurysm: technical note

Background: The authors present a modified interhemispheric approach for the distal ACA aneurysm to resolve several problems including the narrow surgical corridor, the difficulty of proximal control, and the aneurysmal projection toward the surgeon. Methods: We refined the positions of the patient's head and the surgeon. The patient's head is fixed with flexion and tilted to the contralateral side. The surgeon sits on the contralateral side of the patient and not on the cranial side. Results: The present approach allows the surgeon to comfortably use both hands in the horizontal operative filed, to obtain a minimum retraction of the brain, and to easily secure the proximal artery. Conclusions: This modified interhemispheric approach is useful for a patient with the distal ACA aneurysm.ArticleSURGICAL NEUROLOGY. 72(1):65-68 (2009)journal articl

Expression of RECK in endothelial cells of glioma: comparison with CD34 and VEGF expressions

Angiogenesis is thought to be involved in the progression of glioma grades, and reversion-inducing cysteine-rich protein with Kazal motifs (RECK) has been said to be involved in maturation of vessels. In this study, we aimed to determine whether high micro-vessel density (MVD) expressed by RECK in glioma tissue is correlated with grades of glioma. We also compared RECK expression with that of the formerly known vessel marker, CD34, and vascular endothelial growth factor (VEGF). RECK, CD34, and VEGF immuno-reactivities of 72 glioma tissues were studied. RECK was seen in microvessels of glioma tissues. CD34 showed a similar pattern to RECK, whereas VEGF showed positive staining in cytoplasm of tumor cells and endothelial cells. Average MVD with RECK was 107.6 microvessels (range 7-290). RECK was positively correlated with grades of glioma. RECK and CD34 also showed a strong correlation (P = 0.001). Higher frequency of VEGF staining was also correlated with higher grade of glioma. This is the first study describing expression of RECK in glioma, and its angiogenesis-related nature may provide a potential therapeutic target for glioma treatment in the future.ArticleJOURNAL OF NEURO-ONCOLOGY. 107(3):559-564 (2012)journal articl

Revisit of aneurysm clip closing forces: comparison of titanium versus cobalt alloy clip

Although closing force of cobalt alloy clip is well studied, there is only little information of titanium alloy clip available in the literature. In the present study, we examined and compared closing forces of various types and points of cerebral titanium and cobalt aneurysm clips for cerebral aneurysms. Straight, temporary, bayonet, angled, and fenestrated titanium or cobalt alloy clips were tested by measuring the closing forces at various points along their blade length. Closing forces of all the tested clips linearly increased from tip to base of clip blades. Sugita Titanium II clips had bigger closing forces than Elgiloy clips in all type clips except for the temporary clips. The closing forces of Sugita Titanium II and Yasargil titanium clips were similar in straight permanent type clip although there were some differences in closing forces between other types of Sugita and Yasargil clips. Our data showed that the closing forces differed depending not only on manufacturers but also on materials and shapes.ArticleNEUROSURGICAL REVIEW. 36(1):133-137 (2013)journal articl

Reversion-inducing cysteine-rich protein with kazal motifs and matrix metalloproteinase-9 are prognostic markers in skull base chordomas

Prognosis of chordomas is difficult to predict based solely on histological findings. The purpose of this study was to assess expressions of reversion-inducing cysteine-rich protein with kazal motifs (RECK) and matrix metalloproteinase (MMP)-2, MMP-9 in skull base chordomas and to find out their correlations to outcome. Immunohistochemical study was performed in 19 samples (initial, n = 11; recurrent, n = 8) from 11 patients. The correlations among expression of RECK, MMP-2, MMP-9, and their prognostic values were analyzed. Significant correlation between RECK and MMP-9 was found, but there was no correlation found between MMP-2 and MMP-9. Higher MMP-9 expression significantly influenced outcome. Furthermore, MMP-9/RECK ratio showed significant correlation to outcome, showing their inverse relationship in the disease progress of skull base chordoma. RECK and MMP-9 can be valuable markers to predict prognosis in skull base chordomas.ArticleNEUROSURGICAL REVIEW. 33(2):167-173 (2010)journal articl

Suboccipital Approach for Primitive Trigeminal Artery Obliteration Associated with Cavernous Aneurysm

OBJECTIVE: A 63-year-old woman presented with diplopia resulting from abducens paralysis. Examination revealed a giant cavernous aneurysm supplied by the internal carotid artery (ICA) and primitive trigeminal artery (PTA) via the vertebrobasilar system. METHODS: After evaluation of balloon test occlusion (BTO) at the distal side of the PTA origin, the aneurysm was treated with PTA obliteration through the suboccipital route in the lateral position followed by cervical carotid ligation with superficial temporal artery-to-middle cerebral artery anastomosis in the supine position. RESULTS: The aneurysm showed marked shrinkage after the surgery. CONCLUSION: PTA obliteration through the retrosigmoid opening is a therapeutic surgical option in a patient with a cavernous aneurysm supplied by the PTA.ArticleWORLD NEUROSURGERY. 74(4-5):494-496 (2010)journal articl

Outcome predictors of open embolectomy in middle cerebral artery occlusion

Objective: The purpose of this paper was to analyse the outcome of the patients with acute middle cerebral artery (MCA) occlusion treated by open embolectomy. Methods: A clinical chart review was retrospectively conducted for 30 patients who had MCA occlusion and were treated with open embolectomy. According to the Glasgow Outcome Scale, the patients' outcome at discharge is divided in two groups: favorable outcome (good recovery and moderate disability) or unfavorable outcome (severe disability, vegetative state and death). The following variables between the favorable and unfavorable outcomes were analysed: age, sex, Glasgow Coma Scale score on admission, affected side, occlusion site, occlusion time, atrial fibrillation on electrocardiogram, fibrinolysis, aphasia, hemiparesis and hemorrhagic infarction after surgery. Results: The outcomes of 30 patients were favorable in 16 patients (good recovery in nine and moderate disability in seven) and unfavorable in 14 patients (severe disability in 12, vegetative state in one and death in one). The M1 occlusion and fibrinolysis performance were more frequent in the unfavorable outcome group than in the favorable one. Logistic regression analysis with a stepwise method indicated that the only occlusion site was independently associated with the unfavorable outcome. The occlusion time >360 minutes was not the predictor of the unfavorable outcome. Discussion: The outcome of patients with MCA occlusion treated by the open embolectomy depends on the occlusion site and the fibrinolysis performance in the present study. The M1 occlusion is also the independent risk factor of the unfavorable outcome. However, the occlusion time itself has no relation to the unfavorable outcome. These results indicate that therapeutic time windows vary in individuals probably due to the collateral blood flow.ArticleNEUROLOGICAL RESEARCH. 31(9):892-894 (2009)journal articl

Primary ALK-1-negative anaplastic large cell lymphoma of the brain: Case report and review of the literature

Anaplastic large cell lymphoma (ALCL) is a type of non-Hodgkin lymphoma composed of CD30-positive cells. Anaplastic lymphoma kinase (ALK) -1 positive ALCL frequently involves both lymph nodes and extranodal sites. While primary extranodal involvement of ALK-1 negative ALCL is rare, this case is unique in that it is a case of primary ALK-1 negative ALCL of the brain. A 79-year-old man presented with dementia-like symptoms. Neuroimaging revealed a well-enhanced mass in the left parieto-occipital region. The tumor was excised and histological diagnosis of primary ALK-1-negative ALCL was made. Primary ALK-1-negative ALCL in this case showed aggressive clinical behavior and fatal outcome. It is of great importance to avoid any delay in reaching an accurate diagnosis, as even primary ALCL of the brain is too seldom suspected clinically.ArticleNEUROPATHOLOGY. 29(2):166-171 (2009)journal articl