Search PubMed⌕ Search

Biomedical subjects

A Hyodo

Publications and source records attributed to A Hyodo.

87 records · Page 5Linked to original sources
PubMed1984

[Some considerations on surgical approaches to the anterior communicating artery aneurysms--radiological study of 122 cases].

We studied the operative approaches to anterior communicating artery aneurysms by means of reviewing preoperative angiogram and operation records. During the past 5 years, 117 patients with anterior communicating artery aneurysms were operated on in our hospital. Among these, we examined 112 cases of which preoperative angiogram and operation records were satisfactory for this study. We checked the next points on the preoperative angiograms. Neck of aneurysm-planum sphenoidal distance. Direction of the anterior communicating artery. It means which A2 is anterior to the other A2 in the lateral view of angiogram. Size of aneurysm. We checked the next points on the operation records. Operative approach and the side of craniotomy. When the pterional approach was taken, the rectal gyrus was aspirated or not. This analysis derived these two conclusions as below. 1. In the literature, as the operative approach to anterior communicating artery aneurysm, the pterional approach has a lot of advantages. For example, the pterional approach was accomplished without extensive frontal lobe retraction, without mobilization of the temporal lobe, without sacrificing the olfactory tract, and so on. Moreover, in early stage after onset of SAH, it is possible to remove the subarachnoid blood extensively without obvious brain damage by the pterional approach. In this study, we paid attention to the correlation between the neck-planum sphenoidal distance and the fact of aspiration of the rectal gyrus in the pterional approach. The result is that the higher aneurysmal neck was, the more frequently the rectal gyrus was aspirated. So, if the neck-planum sphenoidal distance is under 12 mm, which includes the majority of the cases (94% of cases), we think the pterional approach is the best approach for anterior communicating artery aneurysm.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1983

Relationship between contrast enhancement on computed tomography and cerebral vasospasm in patients with subarachnoid hemorrhage.

To elucidate the relationship between abnormal enhancement of the cisterns on computed tomography and cerebral vasospasm, we performed a systematic and prospective study in 60 patients with ruptured cerebral aneurysms. There is a significant relationship between the findings of contrast-enhanced computed tomography (CECT) within Day 3 of rupture and cerebral vasospasm. Among 37 patients undergoing CECT between Day 0 and Day 3, 17 (46%) showed prominent increases in density in the region around the circle of Willis and its branches. In 13 of 17 cases (76%), severe vasospasm with motor paralysis occurred. In the remaining 4 cases (24%) with only slight or no cerebral vasospasm, the hematoma in the subarachnoid space was removed surgically by Day 3. In 19 of 20 cases without remarkable CECT, no severe cerebral vasospasm with motor paralysis occurred. There is no significant relationship between the CECT findings after Day 3 and cerebral vasospasm. The results indicate that the prominent increase in density in the region of the circle of Willis and its branches often observed on CECT within Day 3 of subarachnoid hemorrhage is useful for prediction of the occurrence of cerebral vasospasm and also provide information on the pathogenesis of cerebral vasospasm.

Aged↗
PubMed1983

Intraoperative use of real time ultrasonography applied to aneurysm surgery.

The intraoperative application of real time ultrasonography during 13 neurosurgical operations for intracranial aneurysms is reported. In 2 cases, the aneurysms themselves could be detected clearly by real time ultrasonic imaging. In the case of a large aneurysm, information about the nature of the aneurysmal wall was obtained. Other lesions coexisting with the aneurysm (namely, intracerebral hematoma, massive subarachnoid hemorrhage, and hydrocephalus) could be recognized clearly. Real time intraoperative ultrasonography is considered to be useful in aneurysm surgery.

Adult↗
PubMed1980

[Chronic subdural hematoma--changed its density from low to high on follow-up CT (author's transl)].

Recently much attention has been paid once again to etiology of chronic subdural hematoma since the appearance of computed tomography (CT). Authors examined 1824 head injury cases by CT from January 1977 to September 1979. Among them, there are 40 cases (they were all over 16 years old) whose CT showed frontal extracerebral low density area. The low density area which is considered to be so-called fluid collection could be classified into four types (type I to IV). In two cases of those 40 cases (5%), the low density area changed into high density area which seemed to be hemorrhage. The 2 cases were diagnosed to be chronic subdural hematoma and proved surgery. The change of density on CT developed only from type I (the brain surface looks smooth and sulci are not recognized beneath the low density area). The change of density, occurred in 2 cases among 24 cases of type I (8.3%), was recognized about 2 months after the head injury. This fact is compatible with the report by Yamada et al. (1979). Thus, when CT after the head injury shows frontal extracerebral low density area of type I, the case may develop to chronic subdural hematoma about 2 months after the head injury. Therefore, careful observation should be needed especially during this period after the head injury.

Adult↗
PubMed1979

[Computed tomography in crossed aphasia (author's transl)].

Crossed aphasia, first described by Bramwell, is aphasia due to the hemispheric damage on the side of handedness. Crossed aphasia in a dextral is rare, and in Japan, there have not been more than ten cases in which the lesion is localized clearly. The cases reported till now have been verified mainly by necropsy. However, the time lag between the appearance of aphasia and the necropsy may affect the conclusion subtly. We consider that computed tomography (CT) can obtain almost the same findings as that by necropsy. However, at present there have been few cases diagnosed by CT except two cases reported by April et al. and Wechsler. We have reported a 47-year-old man in a dextral, who shows left hemiparesis and Broca's aphasia. His lesion is diagnosed by cerebral angiography and CT as the right hemisphere infarction due to right middle cerebral artery occlusion. CT localizes the lesion on the right hemisphere mainly sited deep region and sited wedge shaped cortical area of the fronto-parietal region. On the other hand, it localizes no lesion on the left hemisphere. CT in aphasia has been already reported by Hayward et al. In their report they concluded that correlation of lesion located by CT with aphasia type supported Geschwind's concept of aphasia. In this report we have discussed CT in crossed aphasia analysing our case and the two cases by April et al. and Wechsler. Three cases including our case are all Broca's aphasia, and we compare the lesion location of these three cases with Hayward's lesion located on Broca's aphasia. As the result of this, we can draw the conclusion that the lesion location by CT of these three cases and that of Hayward's report are almost symmetric.

Aphasia↗
PubMed1976

Studies on silk fibroin of Bombyx mori. I. Fractionation of fibroin prepared from the posterior silk gland.

1. Fractionation of fibroin prepared from the posterior silk glands of Bombyx mori was carried out. After carboxymethylation of the fibroin, it was fractionated by ammonium sulfate precipitation, Sephadex G-200 gel filtration and DEAE-cellulose column chromatography. 2. The fibroin was composed of at least two protein groups of large molecular size and three or four components of small molecular size, and, in addition, a mixture of proteins ranging in size from about 25,000 to more than 100,000 daltons with almost the same amino acid compositions. 3. The latter proteins contained about 48% glycine, 32% alanine, 11% serine, 4.5% tyrosine, 2% valine, and other minor amino acids. The sum of these main five amino acids accounts for more than 97% of the total amino acid residues of the proteins. 4. The present results indicate major heterogeneity in the molecular size of posterior silk gland fibroin, and, in addition, suggest the possibility of repeating sequences with relatively simple amino acid compositions in major peptide chains of fibroin.

Amino Acids↗
PubMedDate not supplied

Intracerebral hematoma developing during MR examination.

We report a case of a 78-year-old woman with cerebellar infarction who developed intracerebral bleeding during the magnetic resonance (MR) examination. The intensity of the hematoma was heterogeneous corresponding to the heterogeneous density shown on CT study that immediately followed the MR examination.

Aged↗
PubMedDate not supplied

Superior effect of tazobactam/piperacillin compared to piperacillin on beta-lactamase-producing Pseudomonas aeruginosa.

To evaluate the synergistic antimicrobial effects of tazobactam (TAZ), a beta-lactamase inhibitor, and piperacillin (PIPC) on Pseudomonas aeruginosa, we compared the antimicrobial effects of TAZ/PIPC with those of PIPC alone on bacteria inducibly or constitutively producing beta-lactamase. TAZ/PIPC had more potent antimicrobial effects compared with PIPC on clinical isolates producing beta-lactamase. In the treatment of mouse systemic infection, the therapeutic effect of PIPC was markedly decreased by beta-lactamase, but that of TAZ/PIPC was only slightly decreased. In the treatment of local infections in mice, the therapeutic effects of PIPC were decreased due to the induction of beta-lactamase and the emergence of bacterial strains constitutively producing beta-lactamase, while those of TAZ/ PIPC were not affected.

Animals↗