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Biomedical subjects

H Hondo

Publications and source records attributed to H Hondo.

At least 37 records · Page 2Linked to original sources
PubMed1993

Effect of phencyclidine on endogenous excitatory amino acid release from the rat anterior cingulate cortex--an in vivo microdialysis study.

The effect of systemically administered phencyclidine (PCP) on the extracellular concentration of aspartate (Asp) and glutamate (Glu) in the rat anterior cingulate cortex was investigated using in vivo microdialysis. PCP significantly reduced the K(+)-evoked release of Asp and Glu, while it had no effect on the basal efflux of Asp and Glu. These results suggest that PCP might inhibit excitatory amino acid (EAA) release through an N-methyl-D-aspartate (NMDA) receptor-mediated mechanism.

Amino Acids↗
PubMed1992

Type I congenital plasminogen deficiency is not a risk factor for thrombosis.

The risk of thrombosis in type I congenital plasminogen (PLG) deficiency has been suggested, but is still not confirmed. We studied 40 members of two unrelated families with this disease, and found that 21 were heterozygotes of type I congenital PLG deficiency. Three of them had thrombosis, but the other 18 had no thrombosis. The percentages of family members with no history of thrombosis up to a given age among subjects with type I congenital PLG deficiency and healthy controls were analyzed by the Kaplan-Meier method. No significant difference between the two groups was observed by the generalized Wilcoxon test (p = 0.23). These results suggest that there is no significant correlation between type I congenital PLG deficiency and thrombosis.

Adult↗
PubMed1992

Prognosis of primary malignant lymphoma of the central nervous system--a retrospective study of 32 cases.

A retrospective analysis of 32 patients with primary malignant lymphoma of the central nervous system (CNS) diagnosed between 1976 and 1989 investigated treatment results and recurrence patterns. All patients showed either complete or partial regression of the tumor after initial treatment, mainly radiation therapy with adjuvant chemotherapy. The mean dose of whole-brain irradiation was 40.9 Gy and that of booster was 14.4 Gy. Most patients had tumor recurrence. The median time to recurrence from completion of the treatment was 5 months. The 1- and 5-year survival rates were 50.0 and 17.7%, respectively, and the overall median survival time was 11 months. Most tumors had multiple recurrences at the primary site and other regions of the CNS, and tended to recur in the periventricular region and the cerebrospinal fluid space. Spinal metastasis occurred in five cases. The importance of good control of the primary lesion and active maintenance therapy for the whole CNS is emphasized.

Adult↗
PubMed1991

Coexistence of intracranial and spinal meningiomas--report of two cases.

The authors report two rare cases of multiple meningiomas in both the intracranial and spinal regions. A 64-year-old female presented with a right sphenoidal ridge meningioma and a cervical extramedullary meningioma. Tumor histology was transitional and vacuolated types, respectively. The tumors were removed successfully in two stages, craniotomy then laminectomy 3 months later. A 62-year-old female presented with a right sphenoidal ridge meningioma (meningotheliomatous type) which was totally removed. An extramedullary spinal meningioma became symptomatic 33 months later, which was also removed totally. The meningiomas in the first case had different subtypes, but immunohistochemical characteristics including microcyst formation were similar. The second case had meningiomas of the same subtype with similar characteristics, but different fibrous septum development. Multiple meningiomas, even in different compartments of the central nervous system, may have common characteristics.

Biomarkers, Tumor↗
PubMed1991

[Surgical treatment of hypertensive cerebellar hemorrhage; stereotactic aspiration surgery vs suboccipital craniectomy].

Patients with severe types of hypertensive cerebellar hemorrhage have been treated usually by suboccipital craniectomy and hematoma evacuation. However, since 1981, we have treated such patients with stereotactic aspiration surgery. The purpose of this study was to evaluate the prognosis of patients treated by stereotactic aspiration surgery for cerebellar hemorrhage in comparison with those who underwent suboccipital craniectomy. Between May 1976 and December 1989, 246 patients with hypertensive cerebellar hemorrhage were admitted to our university hospital and affiliated hospitals. The patients were classified into four categories according to the grading of hypertensive cerebellar hemorrhage proposed by Matsumoto in 1982; benign, moderate, severe, and fulminant. Then we decided the most appropriate therapy according to this grading. Fifty-nine patients (24.0%) underwent suboccipital craniectomy and 38 (15.4%) underwent stereotactic aspiration surgery. There was no significant difference in the postoperative outcome between suboccipital craniectomy and stereotactic aspiration surgery in the overall study. However prognosis of the fulminant type was significantly better with stereotactic aspiration surgery than with suboccipital craniectomy. Possible reasons for this include: 1) All patients of this type who underwent aspiration surgery had this procedure within 12 hours after the onset of cerebellar hemorrhage. 2) The hematoma volume of most patients of this type who had aspiration surgery was under 30ml. 3) The age of all patients of this type with aspiration surgery was under 70 years old. In conclusion, we suggest that aspiration surgery for hypertensive cerebellar hemorrhage is indicated for all patients with moderate, severe and fulminant types of hemorrhage.

Cerebellar Diseases↗
PubMed1991

[A case of juvenile hemifacial spasm, successfully treated by microvascular decompression].

A 16-year-old girl had an episode of intermittent involuntary spasm of the right inferior orbicularis oculi muscle at the age of 12. In the following years the right orbicularis oris muscle and platysma were unilaterally and progressively involved in the spasms and with increasing frequency. Medical treatment with minor transquilizer was not effective. She was referred to our department at the age of 16. CT and MRI revealed no abnormality. Angiographical study revealed that the right PICA (posterior inferior cerebellar artery) was tourtously coming off from a relatively high portion of the right vertebral artery. The trunk of the right AICA (anterior inferior cerebellar artery) was not able to be identified. Although the onset of this condition was unusually early, the clinical course and symptoms of hemifacial spasm were so clearly typical that she underwent microvascular decompression surgery on July 26, 1988, at the age of 16. During the operation an upward looping PICA was found crossing and tightly compressing the exit zone of the right facial nerve. The offending artery seemed to be elastic without significant atherosclerotic change. The arterial loop was carefully dissected and replaced with two pieces of sponge prosthesis between the artery and the surface of brain stem. Her hemifacial spasm completely disappeared post-operatively. No recurrence has been noted for over one year in the follow-up observation. Hemifacial spasm is subacutely or chronically a progressive disorder of facial involuntary movement. The arterial compression in the exit zone of the facial nerve is said to be the cause of the disorder and microvascular decompression has been indicated for it since a little before the beginning of this decade.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1991

[Somatosensory evoked potential and brain temperature in the Mongolian gerbil during whole body hyperthermia].

Somatosensory evoked potentials (SEP) have been applied to many men and several animals with cerebral ischemia. But in the Mongolian gerbil, one of the most common models of cerebral infarction, the wave form and the latency of SEP have been studied by few authors. In this report, we studied the effects of hyperthermia on SEP in the gerbil. Six gerbils weighting 40 to 50g were anesthetized and heated with ultra-red ray. Brain and rectal temperatures were continuously monitored. The brain temperature changed from 35 degrees C to 42 degrees C during heating, then returned to 37 degrees C with cooling. Typical SEP peaks have been labelled according to their positive or negative character and their sequential latency determination. The latency of the major positive voltage deflection, P1, was 9.97 +/- 9.94 ms at 37 degrees C. The negative deflection before P1 has been labelled as N0 and the negative waves after P1 and N1 and N2. Peak latency of SEP was significantly reduced gradually during hyperthermia, and increased gradually with recooling. The correlation between the latency of SEP and the brain temperature was very close. Our results emphasize the importance of measurement of SEP during hyperthermia as a monitor of the brain temperature and during experiment for maintenance of the body temperature at 37 degrees C.

Animals↗
PubMed1991

[Simultaneous supra- and infratentorial hypertensive intracerebral hemorrhage].

Multiple intracerebral hemorrhage may occur as rebleeding at the site of the previous lesion or in other places. However, multiple intracerebral hemorrhage occurring simultaneously in the supra-and infratentorial regions is rare. We experienced 9 such cases between May 1976 and December 1989. The clinical symptoms, CT findings and outcome of our cases and of 4 cases which were previously reported in the literature are reviewed in this paper. Out of 13 cases, 11 patients had cerebellar hemorrhage, and the others had pontine hemorrhage in the infratentorium. Among the supratentorial lesions, 11 involved hemorrhage in the putamen or the thalamus, and the others were in the subcortical region. There were no characteristic initial symptoms or neurological signs which suggested that hemorrhage had occurred in both the supra-and infratentorial regions. The only methods by which we could recognize this exceptional situation were the CT scan and MRI scan. The outcome in those patients whose initial neurological grading (NG) was 1 to 3 was good with conservative therapy or surgical treatment. On the other hand, the outcome in patients whose initial NG was 4 or 5 was very poor no matter what treatment was used. As far as surgical treatment is concerned, we believe that hematoma evacuation is necessary when the cerebellar hematoma is bigger than the supratentorial hematoma.

Aged↗
PubMed1990

Computed tomography controlled aspiration surgery for hypertensive intracerebral hemorrhage. Experience of more than 400 cases.

To overcome the disadvantages of conventional surgery, we developed our own method of computed tomography controlled stereotactic aspiration surgery for hypertensive intracerebral hemorrhage. A new ultrasonic surgical aspirator was also developed to facilitate aspiration of a dense clot in the acute stage. Between 1980 and 1988, 437 patients with hypertensive intracerebral hemorrhage underwent aspiration surgery. Computed tomography controlled stereotactic aspiration surgery can be performed in hematomas of any site or any stage with minimal tissue damage, even in aged patients. Aspiration surgery led to a favorable clinical experience and outcome, especially in the acute stage.

Activities of Daily Living↗
PubMed1990

Intracranial and intraspinal dissemination from pineal yolk sac tumor treated by PVB therapy--case report.

A 15-year-old male was admitted because of diplopia and persistent headache. Postcontrast computed tomography (CT) revealed a homogeneously enhanced large mass, 3 x 4 cm in size, in the pineal region and moderate obstructive hydrocephalus. A right ventriculoperitoneal shunt was installed. At that time, the serum alpha-fetoprotein (AFP) level increased to 23,036 ng/ml, but the level of serum beta-subunit of human chorionic gonadotropin was less than 0.2 ng/ml. These data indicated the tumor to be a pure yolk sac tumor. Following cisplatin-vinblastine-bleomycin (PVB) therapy and whole-brain irradiation (50 Gy), the tumor disappeared on CT, although the AFP level did not return to normal. Eight months after the completion of initial therapy, he had lumbago. Spinal magnetic resonance imaging revealed a metastatic mass at the L5-S2 levels, which was subtotally removed and histologically diagnosed as yolk sac tumor. Postoperative local irradiation (30 Gy) was performed. Seven months after the operation, spinal dissemination at the Th7 level occurred and, 1 month later, intracranial dissemination in the left cerebellopontine angle was detected. He died 25 months after the first admission. PVB therapy did not prevent spinal dissemination in this case.

Adolescent↗
PubMed1990

Spinal cord glioblastoma multiforme with intracranial dissemination--case report.

A case of spinal cord glioblastoma multiforme with intracranial dissemination is reported. A 23-year-old female was admitted to a local hospital complaining of lumbago. Myelography revealed an intramedullary thoracic tumor. The tumor was partially removed through a laminectomy at Th11-L1. The histological diagnosis was glioblastoma multiforme, and focal irradiation (total 50 Gy) was given. Eight months after the operation, symptoms of increased intracranial pressure appeared. Computed tomographic (CT) scans showed marked hydrocephalus, and multiple tumors at anterior horns of bilateral lateral ventricles. A ventriculoperitoneal shunt and an Ommaya reservoir into the left lateral ventricle were emplaced. Three months later, she was transferred to our hospital. CT scans showed enhanced lesions in the fourth ventricle, anterior horn of the left lateral ventricle, septum pellucidum, and pituitary gland. Suboccipital craniectomy was performed, and the mass around the fourth ventricle was partially removed. Histological examination of the tumor specimens showed glioblastoma multiforme. Postoperatively, she received whole brain irradiation (total 50 Gy), and intrathecal injection of beta-interferon via the Ommaya reservoir. However, she died of respiratory insufficiency. It is considered that the spinal cord glioblastoma multiforme disseminated into the intracranial space.

Adult↗
PubMed1990

[Effect of human interleukin-1 on cartilage metabolism].

This study was undertaken to elucidate the effect of human interleukin-1 (IL-1) on the cartilage metabolism, with H235SO4 and 3H-proline as the respective indices for the metabolism of proteoglycan and collagen. We examined in vitro the 35S and 3H rates of incorporation after IL-1 was added to free chondrocytes incubated from human and porcine joint cartilage. As a result, IL-1 suppressed dose-dependently the secretion of both 35S and 3H into the supernatant of the medium containing free human or porcine chondrocytes. There was no difference between the control and the IL-1 group in the elution pattern of proteoglycan on the column-chromatogram. These results indicated that human IL-1 did not affect the molecular weight of the proteoglycan produced by human and porcine chondrocytes.

Animals↗
PubMed1990

[A case of ganglioglioma with choked disc].

A case of ganglioglioma associated with choked disc is reported. A 19-year-old girl was admitted to our hospital because of blurred vision. Neurologically, the patient had nothing but choked disc. The CT showed a large cystic mass with calcification in the left parieto-occipital lobe. The MRI revealed that the cyst was delineated by a membrane and that its dorsal side was solid, showing enhancement by Gd-DTPA. Cerebral angiography showed no tumor stain. Left parieto-temporo-occipital craniotomy was performed and the tumor was removed subtotally. Histopathological examination demonstrated the typical pattern of ganglioglioma. The most common symptom of ganglioglioma is convulsions. Symptoms of increased intracranial pressure have been reported sporadically in the literature. It was clinically noted that the cause of the increased intracranial pressure in this patient was enlargement of the cyst associated with ganglioglioma.

Adult↗
PubMed1989

[Multifocal gliomas in cerebral hemisphere associated with von Recklinghausen's disease: case report].

A case of intracerebral multifocal gliomas with von Recklinghausen's disease is reported. A 12-year-old boy was admitted to our hospital with an episode of convulsive attacks which were uncontrolled by anticonvulsants. CT scan and MRI revealed small well circumscribed tumors in the left frontal cortex and left parietal subcortex. Both of the tumors revealed low density in plain CT scan and low intensity in T1 weighted MRI. The vascularity of these tumors was poor in cerebral angiography. In other words these tumors were of a similar nature. The histology of the frontal tumor, which was totally removed surgically, showed typical pilocytic astrocytoma. The other tumor in the left parietal subcortex must also be included in the category of low grade glioma. In the sixth month after the operation, we could find neither recurrence of the frontal glioma nor enlargement of the parietal tumor, on CT and MRI findings. Immunohistochemically, the outer portion of the Rosenthal fiber in this tumor was positive for GFAP and S-100 protein, but the inner portion was negative, because the GFAP and S-100 protein there had degenerated. The cytoplasm of this tumor's cell was abundant with mitochondria and Golgi's bodies compared to the fibrillary astrocytoma. This case may be the first case of multifocal gliomas in the same cerebral hemisphere. We suggest that multifocal gliomas grow naturally, and over the years, tumors combine with each other and finally constitute a large type diffuse glioma.

Astrocytoma↗