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Biomedical subjects

K Hata

Publications and source records attributed to K Hata.

At least 325 records · Page 18Linked to original sources
PubMed1990

Magnetic resonance imaging of the fetus: initial experience.

Magnetic resonance imaging (MRI) examinations were made on 9 high-risk fetuses (poor fetal growth, 3; maternal manic-depressive psychosis, 1; maternal systemic lupus erythematosus, 1; habitual intrauterine fetal death, 1; twin pregnancy with 1 fetus in distress, 1; fetal hydrocephalus, 1), ranging from 29 to 36 weeks of gestation. T1 weighting sequences were better than T2 weighting sequences for in utero fetal imaging. Fetal movement significantly degraded the imaging quality. In all fetuses, cerebrum, cerebellum, heart, lung, liver, stomach, bladder and extremities were identified and in 1 fetus, even the cochlea was seen. In 2, the four-chamber view of the heart was evident. The signal intensity of the lung was lower than that of the liver in T1 weighting imaging. In the case of maternal lupus erythematosus, a cavum veli interpositi was noted. In the fetus with hydrocephalus, clear images of the intracranial structure were obtained. Similarly, location of the placenta was clearly depicted. MRI is currently less than satisfactory to determine the fetal anatomy, however, it does provide unique and characteristic information that complements the superior anatomic imaging by ultrasonography.

Female↗
PubMed1990

[Construction of an inventory for assessing different modes of hostile aggression].

Hostile Aggression Inventory (HAI) was designed to assess different forms of hostile aggression. Subjects were 232 elementary school children, 195 junior, and 169 senior high school students. After item analyses, 54 items were selected from 96 items, many of which were derived from the Buss-Durkee Hostility-Guilt Inventory. The scale was divided into six subcategories: Physical violence (Pv), Hostility (Ho), Irritability (Ir), Verbal aggression (Vb), Indirect aggression (Id), and Displacement of aggression (Dp). Alpha coefficients were ranging from .68 to .83 for the subscales. The test-retest reliabilities ranged from .54 to .87 for the subscales in 83 senior high school students. Junior high school students of both sexes tended to express higher aggression than elementary school children and senior high school students do on Pv, Ho, and Id. Males obtained higher mean scores than females did on Pv, Id, Dp, and the total, but lower than females did on Ir. The findings showed that the scale possessed adequate construct validity and acceptable levels of reliability.

Adolescent↗
PubMed1990

[Frequency of psychiatric patients visiting non-psychiatrist's outpatient clinic and its correlates].

To examine the frequency of psychiatric patients who visit outpatient clinic of non-psychiatrists in Japan, a mailed questionnaire survey was conducted of 200 non-psychiatrists randomly selected from the 703 registered members of the Kawasaki-city Medical Association, Kanagawa prefecture. Responses from 124 or 62% were received and data for 112 male respondents were analyzed. 1) The median number of psychiatric patients treated per month by respondents was 4, and the median proportion of the total outpatients that were psychiatric patients was 0.7%. 2) Sixty-one internists saw significantly greater numbers and proportions of psychiatric patients than the other 51 doctors. 3) The internists saw a higher proportion of mild anxiety, depression, alcohol-drug dependency and psychosomatic problems among all psychiatric patients than did other doctors. 4) For the internists a significant inverse correlation was observed between the total number of outpatients and the proportion of psychiatric patients. This was the result of a group of physicians who saw a relatively small number of outpatients but had a higher proportion of psychiatric patients among outpatients.

Adult↗
PubMed1990

Subcellular abnormalities of liver sinusoidal lesions in human hepatocellular carcinoma.

Liver sinusoidal lesions in 20 cases of human hepatocellular carcinoma (HCC) were examined with the electron microscope. Kupffer cells existed in the compact type of HCC. In area with pseudoglandular and trabecular cell patterns, Kupffer cells could not be observed. Only a few macrophages were distributed in the tumor tissues. Endothelial cells were altered and showed a poly-layered arrangement and were attached to each other with desmosome-like junctional complexes. There was a general loss of endothelial fenestrae. Endocytotic vesicles could be recognized in these endothelial cells. Poly-layered endothelial cells and accompanying layers of basal laminae were variably arranged between sinusoids and tumor cells with pseudoglandular, trabecular, or compact types of tumor cell patterns. Atypical cells containing numerous lysosomes, together with altered fat-storing (Ito) cells, were located in the tissue space bordering the capillaries. Moreover, tumor cells possessed flattened sinusoidal surfaces. These alterations of the sinusoidal wall suggest that capillarization of liver sinusoids in HCC took place, by loss of fenestrations, formation of basal laminae, and loss of microvilli on the surface of tumor cells. These architectural alterations are thought to completely change the physiological pattern of exchange of metabolites between tumor cells and the sinusoidal lumen. The absence of large numbers of Kupffer cells suggests that at this stage of tumor development, local cellular defense mechanisms were inoperative.

Basement Membrane↗
PubMed1990

[Radiotherapy of aged cancer patients].

Although it is not a categorized modality, cancers of aged patients, generally characterized by a slow growth, histologically high differentiation and low radiosensitivity due to co-existing chronic anemia, should have more individualized treatment because there is a wide spectrum of differences in functional reservoir and tolerance dose of each organs and individuals. In aged cervical cancer of the uterus, we decrease the fractionated and total irradiation dose of a whole pelvic cavity by 10%. For patients more than 80 years old, we principally abandon external beam and singularly chose an intracavitary treatment. In our protocol, there could find no significant difference in 5 year survival between 51-70 y.o. 51.9% (120/231) and 71-80 y.o. 57% (61/107), but in the over 80 y.o. group, it was decreased to 13.6% (3/22) by increased death of other diseases 61.9% (13/21) compared with 18.4% (36/195) in 51-80 y.o. In radiotherapy of advanced lung cancer in aged, we decreased fractionated and total dose by 10 to 20% with minimum irradiation field. In non-small cell carcinoma, a median survival time was 11.5 months in both over and under 70 y.o., although the response rate (CR + PR) was resulted relatively low in aged, 33.3% (N = 45), compared with under 70 y.o., 38.4 (N = 146). The degrees of impairment in respiratory and bone marrow function were similar in both groups. Accordingly, we convinced the efficacy and the necessity of individualized radiotherapy for aged cancer patients.

Aged↗
PubMed1990

Prognostic factors in patients with brain metastases from lung carcinoma: preliminary result of the second trial.

Between September 1980 to December 1984, 85 patients with brain metastases from lung carcinoma were consecutively evaluated and were entered into the first prospective randomized trial. Since January 1985, the second prospective randomized trial was started based on the result of the first trial, i.e., lactate dehydrogenase (LDH) as the most important prognostic factor. We analyzed neurological improvement and survival of 79 patients, who were entered into the second trial until November 1988, compared with the first trial. This preliminary result suggests that LDH may also be an important prognostic factor in the second trial and neurological improvement may depend upon the irradiation dose, therefore we need further investigation in this second trial.

Adenocarcinoma↗
PubMed1990

[Transition of ovarian arterial compliance during the human menstrual cycle, assessed by Doppler ultrasound--correlation with serum hormone levels].

Ovarian arterial velocimetry was performed using color and pulsed Doppler ultrasound. Seventy-one examinations were done on 9 healthy women with regular menstrual cycles. The change in ovarian arterial compliance was based on the calculation of the pulsatility index (PI). In the active ovary carrying a dominant follicle or corpus luteum, PI in the early proliferative phase was significantly higher than that in the late proliferative phase (p less than 0.001), and PI in the early secretory phase was significantly lower than that in the late proliferative phase (p less than 0.001). PI became significantly higher in the late secretory phase than that in the early secretory phase (p less than 0.001). In the inactive ovary without a follicle of corpus luteum, no changes were seen among the values for PI, in any menstrual phase. There was a significant difference between the values for PI in the active ovary and the inactive ovary in the late proliferative, the early and the late secretory phases (p less than 0.001), respectively. The PI values for the active ovary significantly correlated with the serum progesterone levels (r = -0.53, p less than 0.05) but not with the estradiol levels. These findings provide a useful foundation for assessing ovarian hemodynamics during the menstrual cycle.

Adult↗
PubMed1990

[CT findings complicating percutaneous nephrostomy, lithotomy and lithotripsy].

Reviews of the CT scans of percutaneous nephrostomy, lithotomy and lithotripsy disclosed 14 out of 78 cases (17.9%) with evidence of complications. Renal and perirenal hematomas were detected in five cases and the other five cases showed collections of contrast material in the retroperitoneum except for the anterior pararenal space. CT demonstrated clearly the anatomic distribution and extent of renal hemorrhage and extravasation of contrast material. Three cases of pleural effusion on CT were accompanied by blood or contrast material collections in the posterior pararenal space. No patients required immediate surgery and CT findings helped the choice of conservative therapies.

Adult↗
PubMed1990

Tumor-infiltrating lymphocytes from human colon carcinomas. Functional and phenotypic characteristics after long-term culture in recombinant interleukin 2.

Tumor-infiltrating lymphocytes and autologous peripheral blood lymphocytes from 7 patients with adenocarcinoma of the colon were evaluated for expansion and antitumor activities during culture in the presence of 1000 U/ml of recombinant human interleukin 2. Functional and phenotypic characteristics of tumor-infiltrating lymphocytes and autologous peripheral blood lymphocytes were compared between weeks 2 and 3 of culture in recombinant interleukin 2. All but one tumor-infiltrating lymphocyte and all autologous peripheral blood lymphocyte preparations proliferated well in vitro. Tumor-infiltrating lymphocytes expanded better (p less than 0.05) than autologous peripheral blood lymphocytes, reaching median-fold expansions of 2231 (range 1-4720) and 108 (range 13-1263), respectively. Cytotoxicity of interleukin 2-activated tumor-infiltrating lymphocytes and autologous peripheral blood lymphocytes against fresh autologous or allogeneic colon carcinoma targets was relatively low in these cultures. Due to better proliferation, tumor-infiltrating lymphocytes showed significantly greater (p less than 0.05) total cytotoxic activity per culture against fresh autologous tumor-cell targets than did autologous peripheral blood lymphocytes, achieving a median total lytic units of activity per culture of 671 compared with 92 for autologous peripheral blood lymphocytes. Cytotoxicity was not restricted to autologous tumor cells. Two-color flow cytometry demonstrated that the predominant proliferating cell population in interleukin 2-expanded long-term cultures of tumor-infiltrating lymphocytes and autologous peripheral blood lymphocytes expressed the CD3+Leu19- phenotype. Some cultures were enriched in CD3+ Leu19+ and CD3-Leu19+ cells. This study indicated that tumor-infiltrating lymphocytes from most but not all human primary colon adenocarcinomas could be expanded in the presence of recombinant interleukin 2 and mediate non-major histocompatibility complex-restricted antitumor cytotoxicity. Because fresh colon carcinoma cells appear to be resistant to in vitro lysis by interleukin 2-activated tumor-infiltrating lymphocyte and autologous peripheral blood lymphocyte effectors, the role of adoptive immuno-therapy in treatment of advanced colon carcinomas in humans may have to be reevaluated.

Adenocarcinoma↗
PubMed1990

Long-term survival after brain metastases from tracheal carcinoma.

A case of prolonged survival after radiotherapy for primary tracheal squamous cell carcinoma and the subsequent brain metastases is reported. The patient is alive and well without any sign of relapse, approximately six years after the onset of brain metastases from tracheal carcinoma. Radiotherapy proved useful in the treatment of both the primary tracheal carcinoma and the brain metastases.

Brain Neoplasms↗
PubMed1989

[Enhancing effect by anti-cancer drugs on growth inhibition of colon carcinoma in nude mice by monoclonal antibody and complement].

We investigated the possible sero-therapeutic application of monoclonal antibody-A7 against human colorectal cancer. In complement dependent cytotoxicity, A7 showed 59% cytotoxicity against SW1116 cells. In addition, the killing of tumor cells by A7 and C was enhanced when the tumor cells were pretreated with 2 micrograms/ml mitomycin and 40 micrograms/ml adriamycin. Next, we evaluated the in vivo antitumor effect of A7 alone and combined with MMC on human colon cancer (Colon-6) bearing nude mice. The group injected with A7 alone showed definite antitumor effect compared with the non-treated group. The A7+MMC group (MMC: 4mg/kg, A7: 1 mg/body, two times) showed enhanced antitumor effect compared with the groups administered A7 alone or MMC alone.

Animals↗
PubMed1989

Multimodality therapy for small cell carcinoma of the lung--the role of surgical treatment.

Reviewing the outcome of 70 cases of clinically localized small cell lung cancer (SCLC) treated with combined modality treatment, we attempted to define the role of resection in this disease. The survival rate for all cases was 37 per cent at 2 years and 23 per cent at 3 years with a median survival time (MST) of 14 months. For 25 resected cases the overall 5-year survival rate was 37 per cent with an MST of 26 months. According to clinical staging, 5-year survival was 64 per cent for stage I and 20 per cent for stage II. However, none of the stage III cases achieved long-term survival, of over 3 years. In 45 non-resected cases, the overall response rate was 84 per cent with a 44 per cent complete response. The overall survival rate was 27 per cent at 2 years and 14 per cent at 3 years with an MST of 11 months. The 20 cases who achieved complete response had an MST of 26 months with 51 per cent alive at 2 years and 19 per cent at 5 years. Thus, we consider that lung resection is definitely indicated in cases with stage I and probably stage II SCLC. For stage III, however, particularly in cases with N2 disease, resection seems to offer no special benefit in favor of survival compared to combination chemotherapy and radiotherapy.

Adult↗
PubMed1989

Umbilical artery velocity waveforms are not valid indices for assessing growth retardation in utero.

Blood flow velocity waveforms from the umbilical artery of 126 normal fetuses with no complications at 20-41 weeks and in 31 growth-retarded fetuses, were recorded using pulsed Doppler ultrasound. A total of 140 examinations were performed on normal fetuses and 49 on growth-retarded fetuses. The resistance index (RI) was used as an index of blood flow resistance. In 30 of the 31 growth-retarded fetuses (96.8%), the values of RI were within the mean +/- 2 S.D. of normal fetuses. Placental/fetal weight ratio (P/F ratio) was assessed. All values of P/F ratio of growth-retarded fetuses were within the mean +/- 2 S.D. of normal values. Small placentas expressed as a normal P/F ratio almost always associated with normal RI values. Therefore, measurement of RI on umbilical artery blood flow velocity waveform by Doppler ultrasound cannot serve as a valid diagnostic index to predict growth retardation of the fetus in utero.

Blood Flow Velocity↗
PubMed1989

Ultrasonographic measurement of thoracic diameters of the early gestating fetus.

Eighty-two ultrasonographic examinations were performed on 60 of our pregnant patients with regular menstrual cycles and no complications. The pregnancies ranged from 7 to 13 weeks of gestation. Thoracic anteroposterior diameter (ETAPD), transverse diameter (ETTD), cross-sectional area (ETA) and crown-rump length (CRL) were measured on each ultrasonogram. A high correlation between CRL and gestational age was firstly confirmed in this study. ETAPD, ETTD and ETA correlated well with the gestational age and CRL, respectively. Correlations between ETAPD/CRL and ETTD/CRL ratios with the gestational age were negative. A positive correlation of ETA/CRL ratio with the gestational age was evident. Ultrasonographic measurement of the thoracic diameters of the fetus in utero should be a useful parameter to evaluate the gestational age and for early detection of growth retardation in utero.

Embryonic and Fetal Development↗
PubMed1989

Effect of intraperitoneal injection of mitomycin C adsorbed on activated carbon particles on induction of cytolytic peritoneal macrophages of mice.

The effects of the intraperitoneal injection of mitomycin C adsorbed onto activated carbon particles (MMC-CH) were assessed on the host immune status and the induction of cytolytic peritoneal macrophages (PM) in mice in comparison with an aqueous MMC solution (MMC-AQ). PM from inbred C57BL/6 mice and syngeneic B16 melanoma cells were used as the effector and target cells for the PM-mediated cytotoxicity assay. After a single injection of MMC-AQ (at the dose of 1/2 LD50), the weights of thymus and spleen and the 3H-thymidine uptake of spleen cells stimulated by concanavalin A were markedly decreased compared to those following injection of MMC-CH containing the same dose of MMC. A significant difference was found in the chronological changes of peritoneal exudate cell (PEC) numbers and PM cytolytic activity between the MMC-AQ- and MMC-CH-treated mice. One day after MMC-AQ injection, the PEC numbers were decreased markedly. However, they increased ten-fold after MMC-CH injection and the PM cytolytic activity was significantly higher after MMC-CH injection than after MMC-AQ injection during the first 3 days. The present results suggest the possible superiority of MMC-coated charcoal over free MMC both because of a lessening of the effects on host immunity due to prolonged slow drug release and because of the increase in cytolytic macrophages that was induced.

Adsorption↗