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Biomedical subjects

S Uchiyama

Publications and source records attributed to S Uchiyama.

At least 163 records · Page 9Linked to original sources
PubMed1991

Role of platelet-activating factor in aggregation of leukocytes and platelets in cerebral ischemia.

Leukocyte and platelet aggregation stimulated with formyl-methionyl-leucyl-phenylalanine (FMLP) was measured in 32 patients with cerebral ischemia and in 15 controls, using a whole blood aggregometer. The increases in impedance and the reductions in leukocyte and platelet counts were significantly greater in stroke patients than in controls. Aggregation was inhibited by oral ticlopidine, but not by oral aspirin. The effects were clearly counteracted by platelet-activating factor (PAF) antagonists, and counteracted in part by a 5-lipoxygenase inhibitor. The results suggest that platelets tend to be activated by PAF and leukotrienes liberated from hyperaggregable leukocytes in patients with ischemic stroke.

Blood Platelets↗
PubMed1991

Statistical observation of osteosarcoma of the maxillofacial region in Japan. Analysis of 114 Japanese cases reported between 1930 and 1989.

In Japan 114 cases of osteosarcoma of the maxillofacial region have been reported during the past 60 years. The average age at the onset of the disease in this region was about one or two decades later than that of osteosarcoma of other regions. Females were affected more frequently (59.6%) than males (40.4%). The mandible was more frequently affected (58.8%) than the maxilla (41.2%). Swelling was the conspicuous symptom for osteosarcoma of the maxillofacial region. Most patients received surgical treatment with or without radiation and chemotherapy; however, the prognosis is poor, regardless of the type of treatment.

Adolescent↗
PubMed1991

Radiographic changes in wrists with ulnar plus variance observed over a ten-year period.

This study provides additional radiographic information concerning the long-term effect of ulnar impingement. Films of 198 wrists of 102 patients with vibration disease observed over ten or more years were reviewed. All the wrists showed ulnar plus variance of more than 0 mm except seven. Degenerative changes were found in 58 wrists and were seen only on the ulnar side of the wrist, especially in the ulnoproximal area of the lunate. Most of the degenerative changes in the wrists with ulnar plus variance had progressed or changed during the ten or more years. Ulnar plus variance may play an important role in inducing or causing progression of degenerative change in the wrist.

Adult↗
PubMed1991

Isozymes of ribonuclease and the changes in their relative levels during development in the cellular slime mould Dictyostelium discoideum.

The isozymes of ribonuclease were analyzed in cell-free, crude extracts of Dictyostelium discoideum by activity staining of polyacrylamide gels after electrophoresis. The relative levels of three isozymes were then examined during the growth and during the first stages of multicellular development. We observed the replacement of two of these three isozymes by two other isozymes at the pseudoplasmodial stage. These isozymes were different from ribonuclease T1 in terms of their mobility in polyacrylamide gels during electrophoresis. The mobilities of two of the isozymes, DdI and DdII, were 59 and 42% of that of ribonuclease T1. The changes in the relative levels of the isozymes during development are discussed.

Cycloheximide↗
PubMed1991

Opposite effects of metoclopramide and propantheline on intestinal absorption of imipramine in rats.

Intraperitoneally administered metoclopramide (MCP) markedly increased the serum concentration of imipramine (IPM) soon after oral administration. In contrast, intraperitoneally administered propantheline (PPT) slightly decreased the serum concentration. The administration of these two drugs had no significant effect on the serum concentration of IPM after intravenous bolus administration. It was concluded from pharmacokinetic analyses and gastric emptying experiments that the administration of MCP markedly increased the rate of IPM absorption by counteracting the gastric emptying delayed by IPM, but that the administration of PPT slightly decreased the rate of IPM absorption by strengthening the gastric emptying also delayed by IPM.

Animals↗
PubMed1991

[Recent world-wide advances in irradiation of food and its identification].

Irradiation (ionizing radiation) of various foods is growing in popularity internationally. For example, it is used as a substitute for the use of post-harvest pesticides. This trend has served to intensity research on the identification of irradiated foods. The first Research Co-ordinated Meeting on Analytical Detection Method for Irradiated Foods was held in Poland under the sponsorship of FAO/IAEA in 1990 in order to solve problems related to the international trade of irradiated foods and to ensure their correct labelling in the market. In this review, the world-wide advances in the irradiation of food and its identification are introduced and discussed.

Food Analysis↗
PubMed1991

[Survey of radiocesium in domestic mushrooms on the market].

Domestic mushrooms on the market were tested for concentration of radiocesium; cesium-134 and 137 by gamma-ray spectrometer. Cesium-137 was detected in most samples of dried and raw shiitake (Lentinus edodes (Berk.) Sing.). The concentrations were from 6.7 to 73.9 Bq/kg in dried ones and from 1.3 to 6.4 Bq/kg in raw ones. It was not detected in enokitake (Flammulina veltipes (Fr.) Sing.) and shimeji (Lyophyllum aggregatum (Secr.) Kühner and Pleurotus ostreatus (Fr.) Quél.). Cesium-134 was not found in all samples.

Basidiomycota↗
PubMed1991

Prognosis of unresectable hepatocellular carcinoma: an evaluation based on multivariate analysis of 90 cases.

A multivariate analysis of data from 90 patients with unresectable hepatocellular carcinoma was performed using Cox's regression model to identify factors possibly affecting their prognoses. Thirty-one patients underwent arterial anticancer chemotherapy, and the remaining 59 patients received transcatheter arterial embolization with anticancer agents. Four of 27 variables tested for all the patients (i.e., encapsulation [p less than 0.05], gross appearance of hepatocellular carcinoma [p less than 0.01], clinical stage [p less than 0.01] and therapy [p less than 0.01]) were found to be prognostically significant. Five of 27 variables tested were prognostically significant for the transcatheter arterial embolization group; they were an extension rate of hepatocellular carcinoma (p less than 0.01), encapsulation (p less than 0.01), alpha-fetoprotein (p less than 0.01), prothrombin time (p less than 0.01) and serum sodium (p less than 0.01). Regression equations were used to describe a prognostic index. A prognostic index was defined as the regression equation derived from the results of a total of 90 patients; PI-1 = eY, where PI-1 = prognostic index 1 Y = 1.549 (gross appearance of hepatocellular carcinoma - 1.344) + 0.778 (encapsulation - 1.622) + 0.818 (clinical stage - 1.800) + 1.760 (therapy - 1.344) and prognostic index 2, the regression equation derived from the results of the transcatheter arterial embolization group of patients; PI-2 = eY, where PI-2 = prognostic index 2 Y = 1.210 (extension rate of hepatocellular carcinoma - 1.576) + 1.179 (encapsulation - 1.475) + 0.0001277 (alpha-fetoprotein - 1420.792) -0.039 (prothrombin time - 72.237) - 0.214 (serum sodium - 138.427).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

[Periosteal osteosarcoma of the femur: a pathological and ultrastructural study].

A femoral, diaphyseal tumor was found in a 17-year old male, and the diagnosis of periosteal osteosarcoma was made, based on the typical radiological and pathological findings. Microscopic observation on a resected specimen revealed that the tumor was covered with the intact periosteal fibrous layer and did not extend beyond the periosteum. The adjacent cortex was free of tumor. These findings indicated that the tumor originated from the periosteal cambium layer, which lies between the periosteal fibrous layer and the cortex. For transmission electron microscopic examination, the tissue was obtained at open biopsy. Ultrastructurally, no specific cell of periosteal osteosarcoma was found. Although most types of osteosarcoma cells were identified in the tumor (osteoblast-like, chondroblast-like, fibroblast-like, primitive mesenchymal-like, osteoclast-like and so on), the ultrastructural characteristics were of wide variety and of low malignancy.

Adolescent↗
PubMed1991

[Central visual fields in pure alexia "without hemianopsia"--visual dysfunction in the right hemifield, and alexia for "kana" words in the left].

Following a left occipito-temporal subcortical hematoma, a 57-year-old, right-handed man developed pure alexia that was more prominent in kana words, especially in kana nonwords, than in kanji letters. Although a kinetic perimetry with a Goldmann perimeter showed his visual fields to be full, a static perimetry with a Humphrey visual field analyzer disclosed decreased visual sensitivity in the right visual field in its central 30 degrees. In addition, a tachnistoscopic examination with Landolt rings revealed his visual acuity (the ability of two points discrimination) to have decreased in the right half of his central visual filed in its 3 degrees. In the right central vision, he was unable to recognize the letters, pictures or colors presented by the tachistoscope. Concerning the reading, the more letters in kana words or the higher the number of strokes in kanji letters, the more difficulty he experienced in orally reading both kana and kanji. On the contrary, in the left central vision, kanji reading was not so affected by an increased number of strokes as the kana-word reading which became difficult when the number of the letters increased. CT scan showed subcortical hematoma in the left occipitotemporal region. Magnetic resonance imaging 3 months after onset revealed a localized injury in the region between the left postero-inferior temporal lobe and the infero-lateral occipital lobe, including the fusiform gyrus. None of the splenium, the lingual gyrus or the optic area were affected. The spared structures also included the angular gyrus, the Wernicke area and their subcortical white matter.(ABSTRACT TRUNCATED AT 250 WORDS)

Cerebral Hemorrhage↗
PubMed1991

[Type of syndrome, location, size and etiology of capsular lacunar infarction].

We investigated the types of clinical syndrome, location, sizes and presumed causes of 49 patients with capsular lacunar infarction. Clinical syndromes were classified according to Fisher's criteria into pure motor hemiparesis (PM), sensorimotor stroke (SM) and ataxic hemiparesis (AH) including dysarthria clumsy hand syndrome. Cases who had higher brain dysfunctions or brainstem syndromes were excluded. The size of infarcts was expressed as the volume on brain CT. All patients underwent 12-lead ECG and 2-dimension echocardiography. Twenty three patients (47%) underwent angiography or carotid ultrasonography. Lesion sites on CT were divided into three groups, i.e., perforating branch of ACA (PACA), perforating branch of MCA (PMCA) and anterior choroidal artery (AC). Lesion sizes of AH were significantly smaller than those of SM and tended to be smaller than those of PM. In AH patients, no cardioembolic sources nor large arterial lesions could be detected, whereas 40% in SM patients and 30% in PM patients had cardioembolic sources and 33% in SM patients and 75% of PM patients had large arterial lesions. The lesion volume was classified into two groups, larger and smaller than 1 ml. The larger volume group had more frequent cardioembolic sources than the small volume group (42% and 17% respectively, p less than 0.05), but no significant difference in frequency of large artery lesions was found among the two groups. Patients with "large striatocapsular infarct" had frequent cardiac and arterial lesions (60% and 40% respectively). Patients with AC territory infarction had more infrequent but not significant cardiac and arterial lesions than patients with PMCA territory infarction. All patients with PACA territory infarction presented PM.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

Arrhythmogenic right ventricular dysplasia with massive involvement of the left ventricle.

A 30-year-old male died suddenly after two years of clinically progressive episodes of recurrent ventricular tachycardia. In spite of recurrent episodes of palpitation, the patient had never shown signs or symptoms of heart failure before death. Post mortem examination revealed massive left ventricular involvement in addition to complete absence of myocardial tissue in the right ventricle, replaced by adipose tissue. This case illustrates that patients with arrhythmogenic right ventricular dysplasia may die of arrhythmia before failure of the left ventricle.

Adult↗
PubMed1990

Effects of calcitonin gene-related peptide and vasoactive intestinal peptide on nicotine-induced sweating in man.

The effects of two neuropeptides, calcitonin gene-related peptide and vasoactive intestinal peptide on nicotine-induced sweating in human skin were investigated. Intradermal injection of nicotine induced local sweating and each peptide, administered together with nicotine, inhibited these responses in a concentration-dependent manner. The concentration of calcitonin gene-related peptide for threshold and half-maximum inhibition were about 10(-10) M and 10(-8) M, respectively, while those of vasoactive intestinal peptide were approximately 10(-9) M and 10(-7) M, respectively. The results suggest that calcitonin gene-related peptide and vasoactive intestinal peptide have inhibitory effects on the nicotinic action, and release of endogenous calcitonin gene-related peptide and/or vasoactive intestinal peptide may influence sweating in human skin under physiological conditions in vivo.

Adult↗
PubMed1990

[A clinical evaluation of distant metastases from a hepatocellular carcinoma with reference to location, frequency, symptoms, treatment & prognosis].

A clinical analysis of patients with hepatocellular carcinoma (HCC) associated with a distant metastases has been undertaken by the authors. Studied were eight patients (Group A) whose distant metastases were detected at the time of their initial examination, and 24 patients (Group B) whose distant metastases had been diagnosed during the course of treatment of their primary lesions. Complications arising from liver cirrhosis in Group A was less than in Group B. The location of the metastases were the bone in 16, the lung and the adrenal gland in four, the brain and the skin in two and the kidney in one. The mean survival times were 4.6 months (Group A), and 6.3 months (Group B). The cause of death was chiefly a progression of the primary lesion, except for one brain metastases. This analysis had shown that treatment of a bone metastasis is necessary for the relief of pain, and that care should be taken for the prevention of a fracture or paralysis, and that control of the primary lesion is necessary for improving the chances of survival.

Adrenal Gland Neoplasms↗
PubMed1990

[A case of membranous lipodystrophy (Nasu) with diffuse cerebral white matter involvement and cerebellar atrophy on brain CT and MRI].

A 37-year-old female was admitted to our hospital because of progressive dementia and gait disturbance. She was healthy until 34 years of age when she had difficulty in walking and memory disturbance with personality changes. At age 36, she developed urinary incontinence and dementia. The neurological examination demonstrated euphoric mental state, emotional incontinence, severe dementia, paraplegia, dysmetria, choreic movements in both arms and urinary incontinence. Diffuse hyperreflexia and bilateral Babinski signs were observed. Routine laboratory examination showed slightly increased erythrocyte sedimentation rate and alkaline phosphatase. Electroencephalogram revealed diffuse irregular slow waves. X-ray film of the ulnar bone revealed osteoporotic and cystic lesions. The biopsy of the left tibial bone showed a specific membranous cystic structure. Computerized tomography (CT) of the brain showed symmetric, diffuse low density areas in the cerebral white matter and severe atrophy of the cerebellum. T2-weighted magnetic resonance imaging (MRI) revealed diffuse high intensity areas in the cerebral white matter. The present case is characterized by diffuse changes in cerebral white matter and cerebellar atrophy, which have been never reported in Nasu-Hakola disease. The diffuse cerebral white matter changes shown by CT and MRI appear to indicate that this patient is the first case of leukodystrophy of sudanophilic type since the original case reported by Nasu et al.

Adult↗
PubMed1990

[A case of delayed radiation lumbo-sacral plexopathy].

We report a 47-year-old woman who developed a slowly progressive lumbosacral plexopathy with mixed sensorimotor losses in the lower extremities. The symptoms were apparent 8 years after x-ray irradiation for an ovarian carcinoma. Neurological examination showed mild weakness and absent deep tendon reflexes of bilateral lower extremities, and hypesthesia to all modalities in anterior aspects of bilateral lower thighs, in dorsum pedis and soles. Extensive investigations regarding the possibility of tumor recurrence were negative. Computed tomography of pelvis showed abnormal soft tissue densities around the lumbosacral plexus. Intravenous pyelography showed bilateral hydronephrosis and narrowed ureters at the first sacral vertebra level. These findings are consistent with radiation-induced fibrosis rather than tumor infiltration. The results suggest the entrapment lumbosacral plexopathy due to surrounding fibrosis after irradiation. We speculated the sensorimotor losses caused by entrapment of the lumbosacral plexus.

Female↗
PubMed1990

[A case of inorganic germanium poisoning with peripheral and cranial neuropathy, myopathy and autonomic dysfunction].

A 51-year-old man, taking beverage containing inorganic germanium (Ge), (90-100 mg/day, total 70 g) for two years, developed body weight loss, anemia, renal dysfunction, peripheral neuropathy, myopathy, autonomic dysfunctions and multiple cranial nerve palsies. Serum CK, GOT, LDH, BUN, and creatinine levels were elevated. The cerebrospinal fluid showed albumino-cytologic dissociation. Sural nerve biopsy showed axonal degeneration, and peroneal muscle biopsy showed neurogenic changes including type 2 fiber atrophy and ragged red fibers. High level of Ge content was detected from the hair and nail by inductively coupled plasma atomic emission spectrometry. Despite discontinuation of Ge taking, the peripheral neuropathy and autonomic dysfunction progressed. The symptoms remained unchanged even in the treatment with prednisolone. These findings suggest that inorganic Ge has a serious irreversible multiple system toxicity.

Autonomic Nervous System Diseases↗