Hirosuke Fujisawa

Yamaguchi University, Yamaguti, Yamaguchi, Japan

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Publications (92)182.99 Total impact

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    ABSTRACT: A multicenter randomized controlled trial of patients with severe traumatic brain injury who received therapeutic hypothermia or fever control was performed from 2002 to 2008 in Japan (BHYPO). There was no difference in the therapeutic effect on traumatic brain injury between the two groups. The efficacy of hypothermia treatment, and the objective of the treatment, was reexamined based on a secondary analysis of the BHYPO trial in 135 patients (88 treated with therapeutic hypothermia and 47 with fever control). This analysis was performed to examine clinical outcomes according to the CT classification of the TCDB on admission. Clinical outcomes were evaluated with the Glasgow Outcome Scale (GOS) and mortality at 6 months after injury. Good recovery and moderate disability were defined as favorable outcomes. Favorable outcomes in young patients (50 years old) with evacuated mass lesions significantly increased from 33.3% with fever control to 77.8% with therapeutic hypothermia. However, patients with diffuse injury III who were treated with therapeutic hypothermia had significantly higher mortality than patients treated with fever control. It was difficult to control intracranial pressure with hypothermia for patients with diffuse injury III, but hypothermia was effective for young patients with an evacuated mass lesion.
    Journal of Neurotrauma 09/2014; 32(5). DOI:10.1089/neu.2014.3584 · 3.71 Impact Factor
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    ABSTRACT: The goal of this study was to evaluate the clinical characteristics and effects of brain temperature management in patients with severe traumatic brain injury (TBI). A total of 1091 patients were registered from the Japan Neurotrauma Data Bank Project 2009. Those with a Glasgow Coma Scale (GCS) score of 9 or more, a GCS score of 3, bilateral dilated pupils, or cardiopulmonary arrest on arrival were excluded. This left a total of 401 patients. Patients were classified into three groups: no temperature management, with no intervention for brain temperature (225 patients, 56.1%), intensive normothermia (129 patients, 32.2%), and hypothermia (47 patients, 11.7%). Patients' age, GCS score, pupillary abnormality, Injury Severity Score (ISS), intracranial pressure (ICP) monitoring and outcome according to CT classification (TCDB classification) on admission were examined. Patients were significantly older in no temperature management (average age: 61.5 y.o.) compared with normothermia (53.6 y.o.) and hypothermia (46.9 y.o.). ICP monitoring was significantly decreased in 85.1% of patients in hypothermia, 42.6% in normothermia, and 14.7% in no temperature management. Favorable outcome rate were significantly higher in hypothermia (52.4%) compared with normothermia (26.9%) and no temperature management (20.7%) with evacuated mass lesions in contrast to diffuse injury. Multivariate analysis in patients with evacuated mass lesion showed that GCS (≥ 6 pts), and hypothermia were independent factors related to a favorable outcome. Appropriate thermoregulations of the brain for individual patients with various types of TBI are important.
    Journal of neurotrauma 09/2013; 31(4). DOI:10.1089/neu.2013.3057 · 3.71 Impact Factor
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    ABSTRACT: [(123)I] iomazenil (IMZ) single photon emission computed tomography (SPECT) has been reported to be a useful marker of neuronal integrity. We evaluated cortical damage following traumatic brain injury (TBI) with IMZ SPECT at the acute stage. After conventional therapy for a cranial trauma, an IMZ SPECT re-evaluation was performed at the chronic stage. A reduction in IMZ uptake in the location of cerebral contusions was observed during the TBI acute phase; however, images of IMZ SPECT obtained during the chronic phase showed that areas with decreased IMZ distribution were remarkably reduced compared with those obtained during the acute phase. As a result of in vivo microdialysis study, the extracellular levels of glutamate in the cortex, where decreased IMZ distribution was shown during the acute phase, were increased during the 168-h monitoring period. During the chronic phase, IMZ uptake in the region with the microdialysis probes was recovered. The results suggest that this reduction in IMZ uptake might not be a sign of irreversible tissue damage in TBI.
    Acta neurochirurgica. Supplement 04/2013; 118:121-3. DOI:10.1007/978-3-7091-1434-6_21
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    ABSTRACT: A 31-year-old healthy male presented with a rare case of cerebral arteriovenous malformation (AVM) manifesting as repeated ischemic attacks and cerebral infarction causing left sensori-motor disturbance. Neuroimaging revealed cerebral infarction in the right thalamus as well as right occipital AVM without bleeding. The AVM was mainly fed by the right angular artery, and the right posterior cerebral artery (PCA) showed mild stenosis and segmental dilation at the P(2)-P(3) portion. After referral to our hospital, transient ischemic attacks causing left homonymous hemianopsia, and left arm and leg numbness were frequently recognized. Additional imaging revealed a new ischemic lesion in the occipital lobe, and repeated cerebral angiography showed right PCA occlusion at the P(2)-P(3) segment. Cerebral AVM presenting with cerebral infarction due to occlusion of feeding arteries is rare. In our case, intimal injury due to increased blood flow or spontaneous dissection of the artery were possible causes. We should monitor any changes in the architecture and rheology of the feeding vessels during the clinical course to prevent ischemic complications.
    Neurologia medico-chirurgica 12/2012; 52(12):899-902. DOI:10.2176/nmc.52.899 · 0.72 Impact Factor
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    ABSTRACT: Superficial temporal artery (STA) to middle cerebral artery (MCA) anastomosis may have inadequate effects in patients with internal carotid artery (ICA) occlusion and severe stenosis of the ipsilateral external carotid artery (ECA), because poor blood flow in the STA leads to insufficient flow to the MCA. In these patients, dilation of the stenotic ECA is required to improve the blood flow in the STA before STA-MCA anastomosis. A 71-year-old man presented with left hemiparesis and dysarthria. Magnetic resonance imaging revealed an old watershed infarction in the right cerebral hemisphere. Right carotid angiography showed right ICA occlusion and severe ipsilateral ECA stenosis. Single photon emission computed tomography (SPECT) demonstrated severe hemodynamic insufficiency in the right MCA territory. Instead of endarterectomy of the ECA, angioplasty and stenting (CAS) for ECA was performed to ensure adequate blood flow in the STA, due to the history of myocardial infarction and bifurcation of the common carotid artery at a high level (C2 level). Then STA-MCA anastomosis was performed 1 month later. Postoperative SPECT demonstrated marked improvement of hemodynamic insufficiency in the right MCA territory. After treatment, the patient had no ischemic events. This case suggests external CAS together with STA-MCA anastomosis is a good therapeutic option for a patient with symptomatic ICA occlusion and severe stenosis of the ipsilateral ECA if external CEA is difficult to perform.
    Neurologia medico-chirurgica 12/2012; 52(12):906-9. DOI:10.2176/nmc.52.906 · 0.72 Impact Factor
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    ABSTRACT: The Japanese Society of Neurotraumatology announced guidelines for management of severe traumatic brain injury (TBI) in 2000. To evaluate subsequent implementation of these guidelines, we investigated current severe TBI practices in Japan. A questionnaire regarding management of severe TBI was sent to each of the 384 Japanese Neurosurgical Society specialist training medical centers and answers were received by mail from 233 centers (60.7%). Of the medical centers, 29% have neurosurgeons in their emergency department. Initial TBI treatment responsibility resided in the Departments of Neurosurgery in 34% of the medical centers, in the emergency department in 29%, and in 36% responsibility is assigned to both departments. Surgery was performed by neurosurgeons in 90% of the centers and postoperative management was assigned to neurosurgeons in 76%. Acute stage magnetic resonance imaging was done in 52% of the centers. An intracranial pressure sensor was inserted in 55%, and jugular venous oxygen saturation was measured in 21%. Hypothermia therapy was performed in 47%, positive normothermia therapy was administered in 76%, and barbiturate therapy was administered in 70%. Of the centers, 94% acknowledged the guidelines but only 72% of the centers implemented protocols that conformed to the guidelines. Neurosurgeons in Japan are positively involved in management of severe TBI, but few medical centers monitor TBI patients. Many medical centers find it difficult to conform to the guidelines due to lack of neurosurgeons and equipment. These problems can be addressed by consolidation of neurosurgeons into centralized centers and improvement of the medical insurance system.
    World Neurosurgery 03/2011; 75(3-4):563-8. DOI:10.1016/j.wneu.2010.09.013 · 2.88 Impact Factor
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    ABSTRACT: Ebselen is a mimic of glutathione peroxidase that reacts with peroxynitrite and inhibits nitric oxide (NO) synthase. Ebselen has beneficial effects on the neurological outcome of patients with stroke. In this study, the mechanisms by which ebselen can elicit neuroprotective effects against ischemic brain injury were investigated in male Wistar rats. Experimental forebrain ischemia was induced by bilateral common carotid artery occlusion with hemorrhagic hypotension. Ebselen was administered to animals in the treatment group 2 hours prior to the induction of forebrain ischemia, and placebo was administered in the control group. Cerebral blood flow (CBF) was measured by the hydrogen clearance method. Cortical extracellular levels of excitatory amino acids (EAAs) and NO were evaluated using in vivo microdialysis. Neuronal damage in the CA1 subfield of the hippocampus was assessed in brains harvested after a 24-hour period of survival. CBF did not recover to normal physiological levels after ischemic insults in either the control or treatment groups. The differences in the sequential changes in extracellular EAA and NO levels between groups were not statistically significant. There was a significantly larger mean density of intact, undamaged neurons in the CA1 subfield in the treatment group than in the control group. The neuroprotective effects of ebselen were reflected in the histological findings, without significant inhibition of glutamate release or NO synthesis during the acute phase of experimentally induced cerebral ischemia.
    Neurologia medico-chirurgica 01/2011; 51(5):337-43. DOI:10.2176/nmc.51.337 · 0.72 Impact Factor
  • Hiroaki Torii · Tetsu Kurokawa · Hirosuke Fujisawa · Michiyasu Suzuki ·

    Yamaguchi Medical Journal 01/2011; 60(3):63-67. DOI:10.2342/ymj.60.63
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    ABSTRACT: The differences between brain and bladder temperature (delta T), and the relationship of delta T to cerebral perfusion pressure (CPP) and jugular venous oxygen saturation (SjO(2)) were studied during hypothermia in 11 patients with severe traumatic brain injury, of whom 5 underwent conservative treatment for diffuse axonal injury (DAI) (DAI group) and 6 who underwent decompressive craniectomy for hematoma (SDH group). All patients underwent hypothermia treatment. Brain temperature was monitored via an intraparenchymal catheter. Bladder temperature was used as the core temperature. SjO(2) was measured continuously. The outcome of all patients was evaluated at discharge using the Glasgow Outcome Scale. Delta T in the SDH group was significantly lower than that in the DAI group. No relationship was found between delta T and CPP during the investigation period. A significant correlation between delta T and SjO(2) was seen in the DAI group, but not in the SDH group. Decompressive craniectomy affects the brain temperature through external environmental factors. Measurement of brain temperature may be a reliable indicator of cerebral blood flow and brain metabolism in patients with DAI and closed cranium during hypothermia. Further experience is required to test this proposal.
    Neurologia medico-chirurgica 01/2011; 51(8):551-5. DOI:10.2176/nmc.51.551 · 0.72 Impact Factor
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    ABSTRACT: Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy is a cerebrovasuclar disease caused by NOTCH3 mutations, usually localized to exons 3 and 4. This report describes the clinical and neuroradiological findings of 2 subjects of two unrelated Japanese families who shared a common p.Arg332Cys mutation. The subject from family A presented syncope attacks as the sole clinical presentation at the beginning of his disease course. The subject from family B showed recurrent ischemic attacks, followed by a large intracranial hemorrhage. This is the first report to describe the detailed phenotypes of patients with a rare p.Arg332Cys mutation in Japan.
    Internal Medicine 01/2011; 50(22):2833-8. DOI:10.2169/internalmedicine.50.5418 · 0.90 Impact Factor
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    ABSTRACT: We evaluated cortical damages following traumatic brain injury (TBI) in the acute phase with [(123)I] iomazenil (IMZ) single photon emission computed tomography (SPECT). In all, 12 patients with cerebral contusion following TBI were recruited. All patients underwent IMZ SPECT within 1 week after TBI. To investigate the changes in distribution of IMZ in the cortex in the chronic phase, after conventional treatment, patients underwent IMZ SPECT again. A decrease in the accumulation of radioligand for the central benzodiazepine receptor in the cortex corresponding to the contusion revealed with computed tomography (CT) scans and magnetic resonance imaging (MRI) were shown on IMZ SPECT in the acute phase in all patients. In 9 of 12 patients (75%), images of IMZ SPECT obtained in the chronic phase of TBI showed that areas with a decreased distribution of IMZ were remarkably reduced in comparison with those obtained in the acute phase. Both CT scans and MRI showed a normal appearance of the cortex morphologically, where the binding potential of IMZ recovered in the chronic phase. Reduced binding potential of radioligand for the central benzodiazepine receptor is considered to be an irreversible reaction; however, in this study, IMZ accumulation in the cortex following TBI was recovered in the chronic phase in several patients. [(123)I] iomazenil SPECT may have a potential to disclose a reversible vulnerability of neurons following TBI.
    Journal of cerebral blood flow and metabolism: official journal of the International Society of Cerebral Blood Flow and Metabolism 10/2010; 30(10):1673-81. DOI:10.1038/jcbfm.2010.75 · 5.41 Impact Factor
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    ABSTRACT: Gamma knife and CyberKnife radiosurgery are well established and less invasive treatments for arteriovenous malformation. Delayed cyst formation is a rare but well-known complication of radiosurgery for arteriovenous malformations. The optimal treatment of cysts forming after radiosurgery remains debatable. We present a case of cyst formation after radiosurgery for brain arteriovenous malformation that was treated with a cystoperitoneal shunt (C-P shunt). A 36-year-old woman presented with left hemiparesis and numbness. Computed tomography (CT) revealed intracranial hemorrhage in the right basal ganglia. Digital subtraction angiography revealed arteriovenous malformation in the brain. Intravascular embolization was performed three times and radiosurgery was performed twice, whereby complete obliteration of the nidus was achieved. Six and a half years later, routine follow-up magnetic resonance imaging revealed cyst formation, and the patient gradually developed left hemiparesis. First, we performed stereotactic cyst aspiration. This initially resulted in a reduction in the size of the cyst and disappearance of left hemiparesis, but within a short time, the cyst increased in size again and there was recurrence of hemiparesis. Therefore, an Ommaya reservoir was established; aspiration of the cyst through this reservoir brought about an initial reduction in cyst size and alleviation of symptoms; however, no further reduction in cyst size or improvement in symptoms could be achieved. Twenty months after the placement of the Ommaya reservoir, we performed a C-P shunt operation. After the operation, further reduction in the cyst size and complete symptomatic recovery were observed.
    No shinkei geka. Neurological surgery 08/2010; 38(8):751-6. · 0.13 Impact Factor
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    ABSTRACT: The management of patients with poor-grade subarachnoid hemorrhage (SAH) continues to be controversial. The objective of this study was to examine predictors of outcome of poor-grade SAH after surgical obliteration of the aneurysm. The study was performed as a retrospective review of 283 patients with poor-grade SAH who underwent surgical obliteration of the aneurysm at multiple centers in Chugoku and Shikoku, Japan. A favorable outcome at discharge was achieved in 97 of the 283 patients (34.3%). Age (p < 0.001), World Federation of Neurosurgical Societies (WFNS) grade V at admission (p = 0.002), improvement in WFNS grade after admission (p = 0.002), Fisher grade (p = 0.039) and a low-density area (LDA) associated with vasospasm on computed tomography (CT; p < 0.001) showed a significant association with outcome. Further analysis of WFNS grades indicated that most patients who only improved to preoperative grade IV from grade V at admission did not have a favorable outcome. Multivariate analysis identified age (especially of > or =65 years; p < 0.001), WFNS grade V (p < 0.001) and LDA associated with vasospasm on CT (p < 0.001) as predictors of a poor outcome, and improvement in WFNS grade (p = 0.001) as a predictor of a favorable outcome after surgical obliteration of the aneurysm. Advanced age, WFNS grade V, improvement in WFNS grade, and LDA associated with vasospasm on CT were found to be independent predictors of clinical outcome, whereas rebleeding, early aneurysm surgery and treatment modality (surgical clipping or Guglielmi detachable coil embolization) were not independently associated with outcome in patients with poor-grade aneurysm.
    Cerebrovascular Diseases 05/2010; 30(2):105-13. DOI:10.1159/000314713 · 3.75 Impact Factor
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    ABSTRACT: The endovascular approach has become the standard treatment for ruptured aneurysms during the vasospasm risk period following subarachnoid hemorrhage; however, it may be disadvantageous under certain conditions. We report a patient with a ruptured middle cerebral artery aneurysm with severe vasospasm and thrombosis within the aneurysm immediately after angiography. Emergent operative open thrombectomy of the intra-aneurysmal thrombus restored blood flow to the ischemic penumbra territory demonstrated by single photon emission CT scan and diffusion-weighted MRI.
    Journal of Clinical Neuroscience 04/2010; 17(4):517-20. DOI:10.1016/j.jocn.2009.06.040 · 1.38 Impact Factor
  • K Kajiwara · K Yoshikawa · M Ideguchi · S Nomura · H Fujisawa · T Akimura · S Kato · M Fujii · M Suzuki ·
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    ABSTRACT: A new technique using a navigation system to minimize the influence of brain shift and to perform precise resection of brain tumors is demonstrated. To determine the resection plane, one to six tubes were inserted around the tumor under the guidance of a navigation system before dural incision. This technique termed the "navigation-guided fence-post tube" (NGFP) procedure was used to treat 34 patients with intraaxial brain tumors including gliomas (23 cases), malignant lymphomas (4 cases) and metastatic tumors (7 cases). Tumors were removed totally in 23 cases (67.6%), subtotally (95% or more removal) in 6 cases (17.6%) and partially (less than 95% removal) in 5 cases (14.7%). The cases with subtotal or partial resection contained tumors that were close to or involved the eloquent area, or disseminated lesions. No complications due to tube insertion occurred. NGFP is a useful and safe technique for brain tumor surgery with no influence of brain shift during tumor resection.
    min - Minimally Invasive Neurosurgery 04/2010; 53(2):86-90. DOI:10.1055/s-0030-1249053 · 1.14 Impact Factor
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    ABSTRACT: We compare outcomes of ruptured aneurysmal subarachnoid hemorrhage mainly treated by surgical clipping between 2000 and 2004 (early term) with outcomes of patients mainly treated by surgical clipping between 2005 and 2007 (late term) with first selection of endovascular coiling to poor-grade, posterior circulation, or elderly patients. Between January 2000 and September 2007, 287 patients were treated and 147 and 140 patients belonged to early and late terms, respectively. Poor grade patients (Hunt and Kosnik Grade IV, V) comprised 24.5% and 34.5% (NS), posterior circulation patients comprised 14.3% and 10.7% (NS), and, elderly patients (over 70 year-old) comprised 23.1% and 35.0% in early and late terms, respectively. The rate of elderly was significantly higher in late term than in early (p<0.05). Endovascular coiling was performed on 10.9% and 29.8% of patients in early and late terms, respectively, and the rate was significantly higher in late term than in early (p<0.01). Good outcomes were assessed with modified Rankin Scale of 0-2 at 6 months. Good outcomes were 61.2% and 62.1% in early and late terms, respectively (NS). In poor-grade patients, good outcomes were 13.9% and 27.7% (NS), in posterior circulation, 47.6% and 53.3% (NS), and in elderly, 26.5% and 53.5% in early and late terms, respectively, and the rate of good outcomes in elderly was significantly higher in late term than in early (p<0.05). Outcomes of ruptured aneurysmal patients were significantly improved in elderly patients, but not in poor grade, nor in posterior circulation, due to first selection of endovascular coiling. Despite the significant increase of elderly patients, total outcomes of ruptured subarachnoid hemorrhage in late term were not inferior to those of early term.
    Surgery for Cerebral Stroke 01/2010; 38(1):1-6. DOI:10.2335/scs.38.1
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    ABSTRACT: A very rare case of continuous hypertension and tachycardia after excision of a cerebellar hemangioblastoma at the dorsal medulla oblongata is presented. This 21-year-old man was admitted to the authors' hospital with a headache and dizziness. Radiological examination revealed a tumor located behind the dorsal medulla oblongata and compressing it substantially. The tumor was completely resected, but after the surgery the patient experienced prolonged hypertension and tachycardia. Postoperative MR imaging showed a small injury at the dorsocaudal medulla that was located at the caudal site of the nucleus of the tractus solitarius (NTS). Because the NTS has been reported to play a central role in cardiovascular regulation along with the rostral ventrolateral medulla, the authors considered it possible that the NTS injury was the cause of the prolonged elevation of sympathetic tone.
    Journal of Neurosurgery 11/2009; 113(2):369-73. DOI:10.3171/2009.10.JNS09504 · 3.74 Impact Factor
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    ABSTRACT: The Il13ra2 gene is often overexpressed in brain tumors, making Il13ra2 one of the vaccine targets for immunotherapy of glioma. In this study, using a mouse glioma model, the authors tested the hypothesis that vaccination using dendritic cells transfected with Il13ra2 mRNA induces strong immunological antitumor effects. A plasmid was constructed for transduction of the mRNAs transcribed in vitro into dendritic cells. This was done to transport the intracellular protein efficiently into major histocompatibility complex class II compartments by adding a late endosomal/lysosomal sorting signal to the Il13ra2 gene. The dendritic cells transfected with this Il13ra2 mRNA were injected intraperitoneally into the mouse glioma model at 3 and 10 days after tumor cell implantation. The antitumor effects were estimated based on the survival rate, results of histological analysis, and immunohistochemical findings for immune cells. The group treated by vaccination therapy with dendritic cells transfected with Il13ra2 mRNA survived significantly longer than did the control groups. Immunohistochemical analysis revealed that greater numbers of T lymphocytes containing CD4+ and CD8+ T cells were found in the group vaccinated with dendritic cells transfected with Il13ra2 mRNA. These results demonstrate the therapeutic potential of vaccination with dendritic cells transfected with Il13ra2 mRNA for the treatment of malignant glioma.
    Journal of Neurosurgery 11/2009; 113(2):270-9. DOI:10.3171/2009.9.JNS09708 · 3.74 Impact Factor
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    ABSTRACT: This study investigates the role of sphingosylphosphorylcholine (SPC) in the mechanisms underlying cerebral vasospasm after subarachnoid hemorrhage (SAH). The levels of SPC were measured in cerebrospinal fluid (CSF) of patients with SAH and also in an experimental canine model. CSF samples were collected from 11 patients with SAH, and from dogs that had received an injection of SPC into the cisterna magna to examine SPC kinetics in the CSF. SPC was assayed using solid-phase extraction and triple quadrupole mass spectrometry. The SPC concentrations in SAH patients on days 3, 8, and 14 after the onset of SAH were significantly higher than those in normal CSF. In the canine model, rapid dilution of SPC in CSF was observed. In combination with data from previous studies, these results suggest that SPC is involved in the development of cerebral vasospasm. Rapid dilution of SPC in CSF suggests that SPC is released into CSF at higher concentrations than those measured in the present study.
    Journal of Clinical Neuroscience 09/2009; 16(8):1064-8. DOI:10.1016/j.jocn.2009.01.010 · 1.38 Impact Factor
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    ABSTRACT: While the peri-infarct cortex is thought to be responsible for functional recovery, the site is also a strong candidate for post-stroke seizures. Since it is crucial to identify the conditions when the site is changed with such beneficial or detrimental results, the peri-infarct changes were investigated before and just after inducing a focal infarct on rat cortex. The receptive fields in the peri-infarct cortex began to increase a few hours after the infarct, and reached a statistical significance at 6 hours (Dunnett post hoc tests; p<0.05). In temporal association with these changes, EEG in the peri-infarct cortex showed epileptiform activities containing large-amplitude spike-and-wave discharges. The gross amplitude, peak-to-peak amplitude and burst frequency showed statistically significant increases within 4 hours, in comparison to those of the controls (Dunnett post hoc tests; p<0.05). FFT power spectrum analyses showed a distinct increase in approximately 25 Hz frequency bands in the post-stroke groups. The homogeneous area of the contralateral hemisphere in the infarct group, in contrast, did not show such plastic or excitability changes. This study demonstrated, for the first time, that the peri-infarct cortex acquires the characteristics of potential epileptogenesis and functional recovery within hours of a stroke.
    Neurological Research 09/2009; 32(6):666-9. DOI:10.1179/174313209X459138 · 1.44 Impact Factor

Publication Stats

1k Citations
182.99 Total Impact Points


  • 1997-2014
    • Yamaguchi University
      • Division of Neurosurgery
      Yamaguti, Yamaguchi, Japan
  • 1991
    • Kanazawa University
      • Department of Neurosurgery
      Kanazawa, Ishikawa, Japan