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Biomedical subjects

T Fukushima

Publications and source records attributed to T Fukushima.

At least 253 records · Page 14Linked to original sources
PubMed1997

Acute left ventricular dysfunction and left ventricular thrombus in a patient with cerebral hemorrhage.

A 66-year-old woman was admitted to the hospital with a cerebral hemorrhage. An echocardiogram showed severe left ventricular hypokinesis and a left ventricular thrombus. An electrocardiogram showed ST segment elevation in the precordial leads. The patient's creatine kinase level was elevated. A follow-up echocardiogram performed 1 month after admission showed normalization of left ventricular wall motion and disappearance of the thrombus. The results of thallium myocardial scintigraphy, coronary arteriography, and left ventriculography performed 1 month after admission were normal, and the patient was discharged without clinical sequelae. The cause of the patient's left ventricular dysfunction was believed to be not myocardial infarction or myocarditis, but a massive adrenergic discharge due to the cerebral hemorrhage.

Aged↗
PubMed1997

Cerebellar gliomas with exophytic growth--three case reports.

Three patients presented with cerebellar hemispheric astrocytic tumors which showed an exophytic growth pattern. The neuroimaging appearances of these cases mimicked a cerebellopontine angle tumor in two cases, and a posterior fossa extra-axial tumor in the other, which arose from the left cerebellar hemisphere with exophytic extension into the left crural and quadrigeminal cisterns and compressed the midbrain directly. All patients underwent surgical resection, and two patients also received adjuvant radiation therapy and chemotherapy. Intraoperative findings confirmed that the tumors had intramedullary origins from the cerebellar hemisphere, and extended exophytically into the subarachnoid space forming an extra-axial mass lesion. The histological diagnoses were mixed malignant oligo-astrocytoma (grade III), astrocytoma (grade II), and glioblastoma (grade IV). Cerebellar gliomas with exophytic growth to the cerebellopontine angle cistern should be considered in the differential diagnosis of cerebellopontine angle tumors.

Aged↗
PubMed1997

Cranial base approaches to posterior circulation aneurysms.

Aneurysms arising from the posterior circulation, especially when they are large and complex, continue to present a technical challenge. The development of cranial base strategies and principles has added to surgical management options. The authors used one of four cranial base approaches for the treatment of 30 patients with large and/or complex aneurysms arising from the vertebrobasilar circulation. These approaches included the extradural temporopolar, combined petrosal, retrolabyrinthine-transsigmoid, and the extreme-lateral inferior transtubercular exposure. The indications, technique, and results of each approach in this series are discussed, and a management paradigm is suggested for such aneurysms.

Adult↗
PubMed1997

[Flow cytometric analysis of DNA ploidy in oral and pharyngeal carcinomas].

The DNA ploidy patterns of fresh specimens from 145 patients with squamous cell carcinoma of the oral cavity and the pharynx were analyzed. The specimens were embedded in paraffin and the DNA ploidy patterns were analyzed mainly by flow cytometry. Aneuploid patterns were found in 70%, and they were found more frequently in hypopharyngeal carcinomas than in oral cavity carcinomas. Correlation between DNA ploidy and tumor size was statistically significant but metastasis to lymph nodes and clinical stage were not correlated. In stage I and II oral cavity carcinomas and stage III and IV epi and oropharyngeal carcinomas, survival was much poorer in the aneuploid than in the diploid group. Analysis of 30 patients showed better response to preoperative chemotherapy in the aneuploid than in the diploid group; the mean efficacy rates were as high as 68% in the aneuploid and 48% in the diploid group. Aneuploidy with a low DNA index did not respond well to chemotherapy compared with those with a high DNA index. DNA heterogeneity was found in 22% (4/18) of the oral cavity carcinomas and in 50% (6/ 12) of the hypopharyngeal carcinomas.

Aged↗
PubMed1997

Anti-Leukemia Chemotherapy of High-Risk Myelodysplastic Syndromes.

We evaluated the outcome of anti-leukemia chemotherapy on 42 patients with the high-risk myelodysplastic syndromes (MDS)-refractory anemia with excess of blasts (RAEB), 8 cases; RAEB in transformation (RAEB-T), 18 cases; chronic myelomonocytic leukemia (CMMOL), 6 cases; and leukemic transformation of MDS, 10 cases. The median age was 67 (range 20 to 84). As a remission-induction therapy, 35 patients received low-dose chemotherapy, such as low-dose cytarabine infusion, and seven patients received high-dose combination chemotherapy. The complete remission (CR) rates of the low-dose chemotherapy group and the high-dose combination chemotherapy group were 29% and 57%, respectively, and the overall CR rate was 33%. The median survival durations after induction chemotherapy of the CR group (14 cases), the partial remission (PR) group (11 cases), and non-remission (NR) group (17 cases) were 19 months, 8 months, and 3 months, respectively. As a post-remission consolidation chemotherapy, high-dose combination chemotherapy seemed to be superior to low-dose chemotherapy judging from the median CR duration (16 months versus 4 months), but a long-term disease-free survival is hardly expected, in contrast with results in cases of de novo acute myeloid leukemia.

Journal Article↗
PubMed1997

[Preservation of anal transitional zone in restorative proctocolectomy].

Since 1980, restorative proctocolectomy has been established for surgical therapy to ulcerative colitis. The crucial points of this procedure are mucosectomy of the anorectal mucosa and pouch anal anastomosis. Mucosectomy is often difficult due to long standing acute and chronic inflammation and incomplete microscopically and leakage of pouch anal anastomosis is relatively high probably due to steroid given prior to surgery or direct effect of anorectal mucosal inflammation. Regards to postoperative bowel function, nocternal soiling is frequently recognized in the patients who received this operation. To overcome these technical and functional disadvantages, anal transitional zone preservation without mucosectomy and stapled anastomosis between pouch and the upper rim of the puborectalis muscle has been performed. Our series of 84 cases with this modified method, anastomotic leakage was significantly decreased and nocternal soiling was completely disappeared within 7 months postoperatively. And one stage procedure became possible unless severe, or high doses of steroid given prior to surgery. Only one case of mild dysplasia was experienced in the remaining rectal mucosa which was disappeared at the next examination. Medical treatment to the remaining lesion was not necessary in the most of cases. Anal canal preservation is superior to mucosectomy in the points of bowel function and minimizing postoperative complications.

Anal Canal↗
PubMed1997

Augmentation with serum thymic factor of suppressive effects on retroviral tumor development in hosts immune to v-onc product.

Inbred adult female rats were immunized against syngeneic ST-FeSV induced sarcoma cells. ST-FeSV was injected subcutaneously into 57 neonates (vaccinated) born from these immunized females and into 60 non-vaccinated syngeneic neonates. Serum thymic factor (FTS) was injected subcutaneously into 10 of vaccinated and 30 of non-vaccinated rats. Sarcomas developed in 40.4% (19/47) of vaccinated (A), 20.0% (2/10) of vaccinated FTS injected (B), 63.3% (19/30) of non-vaccinated FTS injected (C), and 76.7% (23/30) of non-treated (D) rats. By AB immunostaining using antibody to v-fes product (P85), sarcomas developed in 10 of 13 rats of group C tested, and 3 of 6 rats of group D tested were positive, but those in 7 rats of group A and 2 rats of group B tested were all negative. Lung metastasis was observed in rats of all groups except those of B group. All sera of animals that developed sarcomas were positive to P85 in Western blot analysis. These results showed that FTS augmented suppressive effects on sarcoma development in hosts immune to the viral oncogene product.

Animals↗
PubMed1997

[Improvement of bleeding tendency and normalized platelet count increment following splenectomy in a patient with refractory anemia].

A 72-year-old woman with refractory anemia had severe bleeding tendency. Since 1994, platelet transfusions (10 units three times per week) were unable to maintaining her platelet count over 10 x 10(3)/ microliter. Her hemoglobin was decreased to 3.9 g/dl as a result of bleeding from early gastric cancer. At one-hour after posttransfusion corrected platelet count increment (1-hour CCI) was slightly low, as 14 x 10(3)/microliter/m2. A 24-hour posttransfusion CCI (24-hour CCI) and the (24-hour CCI)/(1-hour CCI) ratio were markedly low, as 0.5/microliter/m2 and 0.36, respectively. Anti-HLA antibody was not detected. The ineffectiveness of platelet transfusion was suspected to be highly associated with splenomegaly. Her spleen had been gradually increased in size since the first clinical examination. She underwent both subtotal gastrectomy and splenectomy, while receiving 40 units of platelet transfusion. After splenectomy, the 1-hour CCI and the (1-hour CCI)/(24-hour CCI) ratio markedly improved (76 x 10(3)/microliter/m2 and 0.79, respectively). Cutaneous bleeding halted and there have been no further episodes, despite less frequent platelet transfusions. This is the first report in which bleeding tendency and CCI were improved by splenectomy in a case of myelodysplastic syndrome.

Aged↗
PubMed1997

[Participatory action-research in the development of health policies for Izumo City, Japan].

The method of participatory action-research has been introduced in planning and implementing health and welfare projects for the elderly in Izumo City since 1993. Public health researchers have participated in the projects with other related administrative sectors, citizen and non-profit organizations. This study analyzes the establishment and implementation of health policies of Izumo from the following five aspects: policy-making, priority, education, intersectoral cooperation and community development. The participatory action-research method was useful for developing the ability of health-staff to work with citizens; for integrating community care and community development; for using community resources effectively for primary health care; and for developing community-based education of citizens, medical students and health staff. This method can be and should be adopted for strengthening the policy-making ability of public health researchers who learn through cooperation with citizens and non-profit organizations.

Community Participation↗
PubMed1997

[An operated case of intractable occipital lobe epilepsy associated with calcification in the occipital lobe].

We reported a 20-year-old female of intractable occipital lobe epilepsy associated with calcification in the left occipital lobe. She developed seizures since 2 years old and electroencephalography showed paroxysmal activities on the left occipital area. At 8 years old, partial resection of the lesion and interictal spike focus under intraoperative corticography guidance was performed, but the favorable seizure outcome was not obtained. At the age of 20 years old, the frequency of her seizures has increased and admitted to our department. Preoperative evaluation with chronic invasive subdural recording showed that the ictal zone was located in the inferior (tentorial) surface and convexity of the left occipital lobe. Functional mapping involving cortical stimulation and cortical recording of pattern-reversal visual evoked potentials demonstrated that the ictal onset zone was not in the visual area. Following cortical resection of the ictal onset zone and multiple subpial transection on the surrounding cortex, she had good relief with less than one minor seizure per 1-3 months. Histological findings of the resected specimen were consistent with those of Sturge-Weber syndrome. Thus chronic invasive subdural recording may improve seizure outcome in patients whose epileptogenic area was located near the visual field.

Adult↗
PubMed1997

K-ras and p53 gene mutations in colorectal cancer in 57 Japanese patients.

Fifty-eight tissue specimens from 57 Japanese patients with colorectal cancer were analyzed for the K-ras and p53 gene mutations by polymerase chain reaction-single strand conformation polymorphism analysis and direct sequencing. K-ras mutations were detected in 21 cases (36.2%) and p53 mutations in 20 cases (34.5%). Eight specimens had both gene mutations. The K-ras mutation was associated with higher degrees of differentiation (p = 0.0019). The P53 mutation was associated with Duke B to D staging (p = 0.028), lymph vessel invasion (p = 0.021), and venous invasion (p = 0.03). Interestingly, a mutation in only exon 7 of the P53 gene was associated with lymph node metastasis. These results suggest the important effect of the mutations of the K-ras and p53 genes, especially p53 gene on colorectal carcinogenesis in Japanese patients. The grades of malignancy of the specimens with the mutations in both genes were not different significantly from those with a single (K-ras or p53) or no mutation, suggesting no cooperation between K-ras and p53 gene mutations on carcinogenesis or tumorigenesis.

Adenocarcinoma↗
PubMed1997

Distribution of free D-amino acids in tissues and body fluids of vertebrates.

Reports on the distribution, metabolism and origins of free D-amino acids in vertebrate tissues and body fluids are reviewed. The transient emergence of D-aspartic acid during the development of brain and peripheral organs or early stages of life is reported. D-Serine in brain is postulated to be a potentiator for the N-methyl-D-aspartate (NMDA) receptor. Some D-amino acid concentrations in human serum, such as D-Ser and D-Ala, are suggested to correlate with damage to renal function.

Alanine↗
PubMed1996

Involvement of 5-HT1A receptor mechanisms in the inhibitory effects of methamphetamine on photic responses in the rodent suprachiasmatic nucleus.

We examined the role of serotonin 1A (5-HT1A) receptors in the inhibitory effects of methamphetamine (MA) on photic entrainment to the circadian pacemaker in the suprachiasmatic nucleus (SCN) of rodents. MA inhibited optic nerve stimulation-evoked field potential in the SCN, light-induced Fos expression in the SCN and light-induced phase shift of hamster wheel-running rhythm. NAN-190, a 5-HT1A receptor antagonist, eliminated the inhibitory effects of MA. NAN-190 has also been reported to antagonize alpha 1 adrenergic receptors. However, prazosin, which selectively antagonizes alpha 1 adrenergic receptors, did not affect the inhibitory action of MA on light-induced Fos expression. In addition, parachloroamphetamine, which is known to be a 5-HT releaser, dose-dependently inhibited light-induced phase shift of wheel-running rhythm. These findings suggest that elevation of endogenous 5-HT levels by MA inhibits the photic entraining responses of the circadian pacemaker in the SCN via 5-HT1A receptor stimulation of the 5-HT released by MA.

Animals↗
PubMed1996

Tissue distribution of DDVP after fatal ingestion.

Tissue distribution of dichlorvos (DDVP) was determined in a case of fatal ingestion using a rapid and simple gas chromatographic (GC) assay. Remarkable autopsy findings were congestion of the lung and kidneys and bleeding ulcer extending from the dorsum of the tongue to the upper pharynx. The serum cholinesterase activity was 2 IU/1, however, miosis was not observed. In the stomach, 250 ml of volatile fluid was found. Tissue distribution of DDVP was determined using a newly developed simple and rapid GC method. DDVP was found in the spleen and heart at higher concentrations (3340 and 815 micrograms/g, respectively), and also detected in the urine at the lowest level (4.5 micrograms/ml). The DDVP concentrations in blood, brain, lung, kidney and liver were 29, 9.7, 81, 80 and 20 micrograms/ml or g, respectively.

Administration, Oral↗
PubMed1996

Amyloid beta protein in plasma from patients with sporadic Alzheimer's disease.

Fibrillar amyloid beta protein (A beta) deposition is increased in the brains of patients with Alzheimer's disease (AD), and is manifested as senile plaques (SPs) and congophilic angiopathy (CA). A beta 40 and A beta 42(43), two chief species of A beta, are documented in SPs and CA, as well as in cerebrospinal fluid (CSF) and cell culture media. A beta 42(43) is the major component of diffuse plaques, the earliest form of SPs. Thus, we hypothesized that determination of the amount of A beta 42(43) in CSF or plasma might provide a diagnostic laboratory test for AD. We measured amounts of different A beta species in plasma from 28 patients with sporadic probable AD, 40 age-matched neurologic patients without dementia and 25 age-matched normal controls using enzyme-linked immunosorbent assays (ELISAs). Plasma concentrations of A beta 1-40 and A beta 1-42(43) did not significantly differ among these groups. These findings suggest the unlikelihood that plasma A beta assays would be useful as a diagnostic tool for AD.

Aged↗
PubMed1996

Proton: a major factor for the racemization and the dehydration at the cyclization/cleavage stage in the Edman sequencing method.

The racemization of the liberated 7-[(N,N-dimethylamino)sulfonyl]-4-(2,1,3-benzoxadiazolyl)-thiazoli none (DBD-TZ) amino acid during the cyclization/cleavage reaction with trifluoroacetic acid (TFA) in the Edman sequencing procedure has been carefully investigated, and evidence is presented to show conclusively that the racemization is caused by the replacement of a hydrogen atom by TFA. The fluorescent reagent 7-[N,N-dimethylamino)sulfonyl]-4-(2,1,3-benzoxadiazolyl) isothiocyanate (DBD-NCS) was used for amino acid sequencing, and DBD-TZ amino acid was used for sequence and configuration determination. DBD-thiocarbamoylated peptides were cyclized and cleaved with deuterated TFA, and the protonated pseudomolecular ions (M-d1 + H)+ of DBD-TZ amino acids were detected by LC/MS. Furthermore, in the reaction kinetics study, we confirmed that the replacement reaction by TFA correlated sufficiently with the racemization of DBD-TZ amino acids. For the purpose of retaining D/L-amino acid configuration in sequencing, we used an aprotic acid, i.e., the Lewis acid boron trifluoride (BF3), for the cyclization/cleavage reaction. When we used BF3, the derivatized DBD-TZ amino acid was scarcely racemized under cyclization/cleavage conditions. Using this method, amino acid sequencing of D-Phe-Met-Arg-Phe-amide could be performed, retaining the D/L-configuration of the amino acid residues.

Amino Acid Sequence↗