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Biomedical subjects

K Nagata

Publications and source records attributed to K Nagata.

At least 811 records · Page 45Linked to original sources
PubMed1989

[Bonding of MMA-BPO. DMPT resin to bovine tooth coated by poly (methyl methacrylate-co-p-styrene sulfonic acid)].

The objective of this study was to prepare a new type water-soluble bonding agent, methyl methacrylate (MMA)-p-styrene sulfonic acid copolymer (MS), and to investigate the effect of MS on bonding between resins and tooth substrates. MS is cross-linked with Ca2+ released from ground enamel and dentin and could be immobilized on their surface. A sample was prepared by bonding an acrylic rod with a BPO-amine catalyzed self-curing resin to ground enamel and dentin coated with an aqueous mixture of FeCl3 and 10 wt% MS. After immersion in water for 24 hrs, the tensile bond strength was measured. The bond strength to both enamel and dentin was only 2 MPa and adhesive failure occurred at the interface between cured MS and self-curing resin. This suggested that cured MS could adversely effect the polymerization of self-curing resins. A second treatment of cured MS on the tooth surface with metallic cations was carried out to minimize the amount of free sulfonic acids in the MS disturbing radical formation in self-curing resin. The second treatment improved the bond strength to 6 MPa.

Acrylic Resins↗
PubMed1989

[Clinical research of specific IgE and IgG4 antibody in allergic children. Examination by multiple factor analysis-type II. (objective variables: specific IgE antibodies and IgG4 antibodies to food allergen)].

We examined the influence power of 16 explanation variables to specific IgE antibody and IgG4 antibody to egg white cow's milk, and soybean in 150 asthmatic children by Multiple Factor Analysis-Type II 16 examination variables; 1) sex, 2) age, 3) onset age, 4) IgE RIST, 5) eosinophile count, 6) IgE RAST score to house dust, 7) IgE RAST score to Dermatophagoids farinae, 8) atopic dermatitis, 9) allergic rhinitis, 10) family history of allergy, 11) positive counts of food allergen: IgG4, 12) specific IgG4 antibody to cow's milk, 13) specific IgG4 antibody to soybean, 14) exercise induced asthma, 15) severity of asthma. The following results were obtained. 1) To introduce range relative ratio, we were able to use all 16 explanation variables on the occation of calculating by Multiple Factor Analysis-Type II. 2) 4 explanation variables (specific IgG4 antibody to soybean, IgE RIST, IgE RAST score to Dermatophgoides farinae, age) had the stronger influence power to 8 objective variables than the other explanation variables. 3) Only 2 explanation variables (specific IgE antibody to soybean, family history of allergy) had the stronger influence power to 8 objective variables than the other explanation variables.

Adolescent↗
PubMed1989

[Clinical research of specific IgE and IgG4 antibody in allergic children. Correlation specific IgE antibody to specific IgG4 antibody to food allergen].

We analysed the correlation specific IgE antibodies to specific IgG4 antibodies to food allergens in 150 asthmatic children by Multiple Factor Analysis-Type II and examined the role of both antibodies. The following results were obtained. 1) Of soybean, there was the stronger influence power between specific IgE and IgG4 antibody than the other 2 food allergens. 2) IgE antibody to soybean had the strong influence power to IgG4 antibodies to egg white and cow's milk and IgG4 antibody to soybean had same influence power to IgE antibodies to egg white and cow's milk. So, the specific IgE and IgG4 antibodies to soybean may be play the role of "the bride" between specific IgE antibody group and specific IgG4 antibody group of food allergens.

Adolescent↗
PubMed1989

[Surgical treatment of spasmodic torticollis: effectiveness of microvascular decompression].

We report two patients of spasmodic torticollis who underwent different types of surgery according to their pathogenetic mechanisms. The first case was a 42-year-old man who had two years history of right-sided antecollis. EMG of the sternocleidal muscle on the affected side showed pathological findings. Characteristic findings on the vertebral angiography were a low position of the branching of tortuous PICA. At operation, we confirmed sandwich-like compression of left accessory nerve between the PICA and vertebral artery. Decompression of the nerve from these arteries led to a remarkable relief of the symptom. The second case was a 70-year-old man whose neck had been forced to bend backward; retrocollis over two years. EMG study was negative. The vertebral angiography showed no abnormality, either. Because there was no evidence of vascular compression on both accessory nerves at surgery, we chose bilateral C1-3 anterior root section which was effective in consequence. We found so far sixteen cases of spasmodic torticollis in the literature including ours who were benefited by microvascular decompression (MVD). All of them presented antecollis or horizontal type. The characteristic operative finding was the compression of the accessory nerve located at between the dural perforation of the vertebral artery and dural attachment of C1 dentate ligament. We can therefore propose a mechanism that the compression at the junction of the central and peripheral myelin causes such a neuroexcitatory symptom as in cases of facial spasm and trigeminal neuralgia.(ABSTRACT TRUNCATED AT 250 WORDS)

Accessory Nerve↗
PubMed1989

[Chronic myelocytic leukemia following chemotherapy of acute promyelocytic leukemia].

Ph1-positive chronic myelocytic leukemia (CML) developing in a treated case of acute promyelocytic leukemia (APL) is reported. The patient was a 62-year-old male who was diagnosed as having APL in December 1978. He was treated with daunorubicin, Ara-C and 6MP and a complete remission was obtained 4 months later. But APL recurred in February 1981. He was treated with BHAC, aclarubicin, 6MP and prednisolone. He remained in continuous complete remission for 5 years, when all therapy was discontinued. After then, the leukocytes count continued to rise and a diagnosis of Ph1-positive CML was made in September 1986. His leukocytes count has been well controlled with the use of busulfan. The event in this case suggests a possibility of the Ph1-positive CML being a secondary disease related to prior long term chemotherapy.

Aclarubicin↗
PubMed1989

[Studies on the operative factors affecting the reduction of chronic subdural hematoma, with special reference to the residual air in the hematoma cavity].

The authors previously reported the effect of preoperative factors affecting the reduction of chronic subdural hematoma. In this report, we evaluated some operative factors, including operative methods, duration of drainage, and residual air volume, with newly developed CT volumetry technique. As described before, the hematoma volume reduces exponentially. An exponential curve was fitted to the reduction curve using the least square method, and its half reduction days (HRD) was calculated. This HRD represents a mathematical indicator of the reduction rate of CSDH. Using this technique, the relationship between this HRD and operative method, the duration of drainage and the volume of the postoperative residual air were examined in 61 patients. Operative method (burr hole or small craniotomy) has no correlation with HRD. The duration of drainage also has no correlation. However, the volume of the residual air was highly correlated with the reduction rate of hematoma (r = 0.430; p less than 0.01). These results suggest that the residual air in the hematoma cavity may delay the reduction rate of the hematoma. Based on these results, the authors pay attention to the following points; 1) Less invasive burr hole method should be selected. 2) Patient's head position should be controlled to make the burr hole at the highest level in the operative field. 3) Hematoma cavity should be filled with saline as much as possible. 4) The inner membrane should never be injured, as it may cause tension pneumocephalus. Moreover, the drainage of cerebrospinal fluid may reduce the counter pressure and it leads to the delay of the hematoma reduction.

Adult↗
PubMed1989

[Successful treatment with a small dose of N4-behenoyl-1-beta-D-arabinofuranosylcytosine in a case of chronic myelomonocytic leukemia in blastic crisis].

A 56-year-old female was admitted for the examination of leukocytosis in May, 1982. The hematological examination showed hemoglobin 12.0g/dl, platelets 14.5 X 10(4)/microliters and leukocytes 18,000/microliters with 28% of monocytes. A bone marrow aspiration revealed granulocytic hyperplasia. Granulocytes showed nuclear abnormalities, such as folding or lobulation. From these data, a diagnosis of chronic myelomonocytic leukemia (CMMoL) was made and followed with no treatment for 2 years. However, fever, bone pain, anemia, thrombocytopenia and the increase of monoblasts in the peripheral blood and bone marrow were observed in May, 1984. These findings indicated that she was in the blastic phase. She was treated by intensive combination chemotherapy (BHAC-AMP), but did not attain any remission. Therefore, a small dose of N4-behenoyl-1-beta-D-arabinofuranosylcytosine (BH-AC; 1 mg/kg/day) was administered for 70 days. As a result, complete remission was obtained and continued for 37 months with the same therapy. The experience of this case suggests that small dose of BH-AC could be applied to a case of CMMoL in blastic crisis.

Antineoplastic Agents↗
PubMed1989

[Multi-modal treatment of patients with multiple liver metastases caused by sigmoid cancer].

A case of sigmoid cancer with multiple liver metastases (S2PON3 + H3) who was treated by multi-modal treatment was reported. The multi-modal treatment is including intra-arterial administration of anti-cancer drugs as a pre-surgery treatment, intra-arterial infusion chemotherapy lasting for three to five weeks (three times), hyperthermia treatment combined with intra-arterial administration of anti-cancer drugs and intra-arterial expandable metalic stent. The patients lived for 2 years and 4 months in good condition.

Aged↗
PubMed1989

Effects of recombinant human tumor necrosis factor on the self-renewal capacity of leukemia blast progenitors in acute myeloblastic leukemia.

The effects of human recombinant tumor necrosis factor type alpha (rTNF alpha) on the blast progenitors from 14 acute myeloblastic leukemia (AML) patients and 1 chronic myelogenous leukemia patient in blastic crisis were studied in methylcellulose and suspension cultures. Blast progenitors renew themselves and/or undergo terminal divisions. Plating efficiency of primary colony formation (PE1) in methylcellulose, which is considered to reflect the terminal divisions of blast progenitors, was suppressed by rTFN alpha in a dose-dependent manner in all cases. Plating efficiency of secondary colony formation (PE2) and the recovery of clonogenic cells in suspension culture, which are considered to reflect the self-renewal capacity of blast progenitors, were also suppressed by rTNF alpha in a dose-dependent manner in almost all cases. rTNF alpha also inhibited both PE2 and clonogenic cells in suspension culture, even in relapsed AML patients who were very refractory to intensive chemotherapies. The results demonstrate that rTNF alpha inhibits not only terminal divisions but also the self-renewal capacity of leukemic blast progenitors. The finding that rTNF alpha suppressed the self-renewal capacity of leukemic blast progenitors proposes the utility of rTNF alpha to AML therapy.

Cell Division↗
PubMed1989

[Chronic demyelinating polyradiculoneuropathy associated with malignant histiocytosis].

A case of malignant histiocytosis (MH) presenting with peripheral nerve involvement is described. A 67-year-old man initially noted left facial weakness on July 20, 1986. The symptom was improved within a week, however, two weeks later he noticed numbness in his fingers and a burning pain in his legs, which was followed by double vision and progressive weakness in all four limbs. On examination, he was found to have total ophthalmoparesis of the right eye and a trace of the left facial palsy. There was severe weakness of the leg muscles, as well as mild weakness of the arms. This was accompanied by wasting of his limbs. All tendon reflexes were absent. Planter responses were flexor. Although cutaneous sensation was intact, vibratory sense was markedly impaired in the legs below the knees. The sphincter function was mildly disturbed. The sedimentation rate was 32 mm/hr. The hemoglobin was 11.9 g/dl and the leukocyte count was 5,700/mm3. The platelet count fell to 60,000/mm3. Results of routine biochemical and radiological studies were unremarkable. The cerebrospinal fluid protein level was 129 mg/dl with a normal cell count. Motor nerve conduction study revealed marked reduction in amplitude of the compound muscle action potential, slow motor nerve conduction velocities and multifocal conduction blocks along the nerve trunks (the left ulnar nerve in the forearm, the bilateral tibial nerve in the lower leg). F-wave was absent or elicited with prolonged latency and with increased chrono-dispersion. Sensory nerve had normal or nearly normal conduction. EMG sampling showed an impaired interference pattern during voluntary contraction and a few denervation potentials at rest.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1989

[A case of RAEB in transformation successfully treated by low-dose Ara-C treatment].

A 65-year-old male admitted to the Anjo Kosei Hospital due to pancytopenia. The findings at the time of admission were; leukocyte count 2,000/microliters, erythrocyte count 1,580,000/microliters, and platelet count 88,000/microliters. Bone marrow specimen revealed mild hypocellularity with 26% of the blast cells. He was diagnosed RAEB in transformation. Chromosome analysis showed 46, XY, -7, +8, -17, + marker in three cells and 45, XY, -7, -17, + marker in two cells out of five cells. He was treated with the low-dose Ara-C (20mg/body s.c. injections every 12 hrs) for 9 days. Twenty five days later, the blast cells in the bone marrow decreased to 4%, and the complete remission was obtained. The duration of remission is 27+ weeks. At the time of complete remission, the bone marrow cells showed the normal karyotype. In this case, the effect of low-dose Ara-C to the blast cells may have not resulted from induction of differentiation but cytocydal action.

Aged↗
PubMed1989

[The continuous-DCMP therapy for acute nonlymphocytic leukemia in elderly patients--comparison with younger patients].

Twenty seven previously untreated patients of acute nonlymphocytic leukemia with age ranging from 30 to 77 years, received a 7-day remission induction regimen consisting of daunorubicin, cytosine arabinoside, 6-mercaptopurine and prednisolone (continuous-DCMP). Patients who achieved complete remission were given ten courses of consolidation therapy and followed without any maintenance therapy. The complete remissions were obtained in 7 of 15 patients (46.6%) 60 years and older, and in 11 of 12 patients (91.7%) 30-59, years of age. Although a high mortality during periods of marrow hypoplasia after the intensive induction therapy, and early relapses in the 60 years and older patients remain major problems, our data suggest the elderly patients deserve a trial of intensive combination chemotherapy.

Adult↗
PubMed1989

[Squamous cell carcinoma of the lung metastasized solitary cystic formation in the cerebellum].

A 54-year-old male previously diagnosed as having a lung squamous cell carcinoma T2N2M0 in stage III A was readmitted to our hospital, as he was complaining of a gait disturbance. A brain CT, an MRCT scan, and vertebral arteriography revealed that the lung carcinoma had metastasized as a solitary cystic formation in the right cerebellum. Thus, a craniotomy, a cyst fluid aspiration, and tumoral resection was performed. Histopathological findings of the cyst wall indicated a squamous cell carcinoma, and the protogram of the cyst fluid found it similar to that of the serum. These findings suggest that destruction of the blood-brain-barrier by the invasion of the carcinoma caused an exudation of serum, resulting in the accumulation of cyst fluid.

Body Fluids↗
PubMed1989

Reproducible establishment of hemopoietic supportive stromal cell lines from murine bone marrow.

Stromal cell lines, designated MS-1, -2, -3, -4, -5, -6, and -7 were established by irradiating the adherent cells in long-term bone marrow cultures with 900-rad x-rays. Two of the cell lines, MS-1 and MS-5, have the capacity to support the growth of hemopoietic stem cells (spleen colony-forming cells and granulocyte-macrophage colony-forming cells) for greater than 2 months in vitro. These two cell lines were alkaline phosphatase-, peroxidase-, and factor VIII-negative and positive for periodic acid-Schiff and nonspecific esterase. Extracellular matrix proteins such as fibronectin, laminin, and collagen type I were produced by these two cell lines. Neither MS-1 cell- nor MS-5 cell-conditioned medium supported the growth of hemopoietic stem cells, and hemopoietic stem cells were found preferentially to be under and on MS-1 and MS-5 layers rather than in suspension. Close contact with the MS-1 cell layer or the MS-5 cell layer appears to be essential in maintaining hemopoiesis in vitro. Conditioned media from MS-1 cells and MS-5 cells stimulated granulocyte colony formation from murine bone marrow cells in semisolid culture.

Animals↗
PubMed1989

[The effectiveness of FID-CT (functional image of dynamic CT) for the evaluation of early cerebral ischemia].

A computer program was newly developed to display the ischemic area from the serial dynamic CT scan, namely the functional image of the dynamic CT (FID-CT). The principles of FID-CT are as follows; Seven rapid-sequence dynamic CT scans were taken following a peripheral bolus intravenous injection of 40 ml of iopamidol. As the data from each scan can be separated into three consecutive segments, we obtained 21 images during 44 seconds. Time density curves of each pixel were calculated employing Gamma variate fitting method. Eight functional parameters obtained from this curve were displayed with gray-scale pixel by pixel. These eight images were functional images obtained from dynamic CT. Only three or four minutes were required to complete all the calculations. Twenty-two patients were examined with both FID-CT and 123I-SPECT. In each case, the lesion detected by FID-CT was remarkably consistent with that shown by SPECT. Two representative cases were presented. The authors believe that FID-CT is a very useful diagnostic method in the acute stage of cerebral ischemia because the method can be quickly and easily performed and it discloses the ischemic area with fair certainty.

Aged↗