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Biomedical subjects

T Hata

Publications and source records attributed to T Hata.

At least 181 records · Page 10Linked to original sources

Primary cardiac angiosarcoma with superior vena caval syndrome: review of surgical resection and interventional management of venous inflow obstruction.

Primary cardiac angiosarcoma occurs rarely, and surgical resection is often required to relieve symptoms. A 66-year-old man whose presenting symptoms were palpitations and general fatigue is presented. Echocardiography revealed a large tumour occupying most of the right atrium. When superior vena caval (SVC) syndrome developed, surgical resection of the tumour was attempted. The tumour was found to have invaded the inflow of SVC, left atrium, right ventricle and ascending aorta. The bulk of the tumour was resected, requiring reconstruction of the right atrium and caval inflows. Histopathological diagnosis of the tumour was primary angiosarcoma. In the postoperative period, symptoms of SVC syndrome recurred, which were relieved temporarily by balloon angioplasty. After one month, recurrence of symptoms was again managed by catheter dilation. On this occasion a metallic stent was deployed, which prevented further symptoms of SVC syndrome during the eight months before the patient died with generalized metastases.

Aged↗

Association of thymidine phosphorylase concentration with ultrasound-derived indices of blood flow in ovarian masses.

BACKGROUND: The aim of this study was to determine the relationship between the concentration of thymidine phosphorylase (a known angiogenic factor) and indices of blood flow in physiologic ovarian tissues and overt (benign and malignant) tumors. METHODS: The ovaries of all patients were examined by transvaginal ultrasonography, with color Doppler imaging and pulsed Doppler spectral analysis, within the 24 hours preceding laparotomy. Ovaries removed at surgery were dissected into their main components (follicles, corpus luteum, and tumor) and, where possible, into areas of high blood velocity according to the results of color Doppler imaging. The concentration of thymidine phosphorylase was measured by an enzyme-linked immunosorbent assay. RESULTS: Thirty-eight tissue aliquots (16 from normal ovaries and 22 from ovarian tumors) were obtained from 33 patients. Twenty-nine tissue samples (76%) came from areas of measurable (high) blood velocity. The concentration of thymidine phosphorylase was significantly higher in tissue associated with high blood velocity (median 17.9, range 1.8-78.3 units per mg of protein vs. median 6.8, range 1.3-24.7 units per mg of protein, respectively; P < 0.05, Mann-Whitney U test). All of 8 corpora lutea, 12 of 14 benign tumors, and 7 of 7 malignant tumors had measurable blood velocity. There was a significant correlation between the concentration of thymidine phosphorylase and the peak systolic velocity in benign tumors (correlation coefficient [r] = 0.79, P < 0.01) and malignant tumors (r = 0.87, P < 0.05). CONCLUSIONS: High intratumoral peak systolic velocity as determined by transvaginal color Doppler imaging and spectral analysis reflects high production of thymidine phosphorylase. This finding may aid the development of antivascular therapy for patients with ovarian carcinoma.

Adolescent↗

Effects of pressure and local anesthetic tetracaine on dipalmitoylphosphatidylcholine bilayers.

The temperature-pressure phase diagram of dipalmitoylphosphatidylcholine (DPPC) multilamellar vesicles was constructed in the presence of a local anesthetic tetracaine hydrochloride (TC-HCl). The phase-transition temperatures under various pressures were determined by the method of high-pressure light transmission. The temperature of the main transition from the ripple gel (P'(beta)) to the liquid crystal (L(alpha)) phase was depressed by the addition of TC-HCl and elevated by application of pressure up to 150 MPa. The temperature of the pretransition from the lamellar gel (L'(beta)) to the P'(beta) phase was also depressed by the addition of TC-HCl below ca. 10.0 mmol kg(-1) and elevated by the pressure below ca. 50 MPa. Therefore, pressure-anesthetic antagonism for both phase-transitions was confirmed. The pressure-induced interdigitated gel (L(beta)I) phase has been observed under high pressure above 100 MPa in the absence of TC-HCl. The L(beta)I phase is known to be induced also by a variety of small amphiphilic molecules such as ethanol, benzyl alcohol and TC-HCl. In the presence of TC-HCl ranging in concentration up to 20.0 mmol kg(-1), the L(beta)I phase instead of the P'(beta) phase appeared at higher pressure. Present results revealed that pressure facilitates, rather than antagonizes, the effect of TC-HCl on the occurrence of interdigitated gel phase. Furthermore, two regions of two phase coexistence were observed under high pressure in the presence of TC-HCl. One is probably a region of coexisting L(beta)I and L(alpha) phase, which was found between L(beta)I and L(alpha) phases under various pressures. The other is probably a region of coexisting L'(beta) and L(beta)I phase, which was observed in the presence of TC-HCl up to 10.0 mmol kg(-1) at the pressure above 40 MPa and at the temperature below ca. 35 degrees C.

1,2-Dipalmitoylphosphatidylcholine↗

Integration patterns of HTLV-I provirus in relation to the clinical course of ATL: frequent clonal change at crisis from indolent disease.

We examined human T-lymphotropic virus type I (HTLV-I) DNA integration in 68 patients with adult T-cell leukemia/ lymphoma (ATL) by Southern blotting using EcoRI, which does not cut within the 9 kb of the genome and probes for pX and gag-pol region of HTLV-I. We detected defective proviral integration as a monoclonal band of various sizes with the pX but not with the gag-pol probe, or a monoclonal band of less than 9 kb with the pX probe, in 20 patients (29.4%). These were designated defective (D) type. With both probes, a single band greater than 9 kb was detected in 34 (50.0%), designated complete (C) type, and two or more bands greater than 9 kb, were designated multiple (M) type, in 14 (20.6%). Advanced age, a high LDH value, and hypercalcemia were more frequent in D type patients. The median survival time (MST) was 6.8, 24.4, and 33.3 months, for D, C, and M types, respectively (log rank P = .006). Among 52 sequentially examined patients, the HTLV-I integration patterns changed in 4 (7.5%). In three of these four, the rearrangements of the T-cell receptor (TCR)b gene concomitantly changed, suggesting the appearance of a new ATL clone. Another patient had the same rearrangement of the TCRb gene, indicating clonal evolution. The HTLV-I integration pattern changed at crisis from indolent to aggressive ATL in three patients. These findings suggested that the HTLV-I integration patterns have clinical implications in ATL pathophysiology. In contrast to the clonal evolution characteristic of the multistep carcinogenesis of most human malignancies, the frequent clonal change of ATL at crisis is a peculiar phenomenon, probably reflecting the emergence of multiple premalignant clones in viral leukemogenesis as suggested in Epstein-Barr virus associated lymphomagenesis in the immunocompromised host.

Aged↗

MRI in carcinomatous encephalitis.

We report a rare case of miliary brain metastases presenting with symptoms similar to encephalitis ("carcinomatous encephalitis"). Contrast-enhanced MRI demonstrated miliary metastases more distinctly than other imaging methods and reproduced the pathological features.

Adenocarcinoma↗

Maternal ophthalmic artery Doppler velocimetry in normotensive pregnancies and pregnancies complicated by hypertensive disorders.

OBJECTIVE: Our objective was to compare maternal ophthalmic artery pulsatility index values in normotensive pregnancies and pregnancies complicated by hypertensive disorders. STUDY DESIGN: The ophthalmic artery in 17 normotensive nonpregnant women, 29 normotensive pregnant women, 9 patients with mild preeclampsia, 6 with severe preeclampsia, 6 with transient hypertension, and 9 with chronic hypertension was studied with color Doppler flow imaging and pulsed Doppler ultrasonography. The mean arterial blood pressure and the ophthalmic artery pulsatility index were calculated in each group. RESULTS: The pulsatility index (1.17 +/- 0.08) in severe preeclampsia was lowest among the groups p < 0.05), whereas that (2.92 +/- 0.59) in normotensive pregnant women was highest among the groups (p < 0.05). The pulsatility index (1.47 +/- 0.30) in mild preeclampsia was significantly lower than that (1.89 +/- 0.27) in transient hypertension (p < 0.05). There was no significant difference in pulsatility index between mild preeclampsia and chronic hypertension (1.69 +/- 0.49) or between transient hypertension and chronic hypertension. The pulsatility index inversely correlated well with the mean arterial blood pressure (R2 = 0.645, p < 0.0001). CONCLUSIONS: These results suggest that the lower pulsatility index should be interpreted as orbital vascular vasodilation, indicating orbital hyperperfusion or hyperemia. Changes in pulsatility index in the ophthalmic artery may be indicative of similar changes in other cerebral vessels.

Adult↗

Heterotopic salivary gland adenocarcinoma in the cervical region.

A case of heterotopic salivary gland adenocarcinoma (HSGA) in the right cervical region is presented. The carcinoma cells were positive for alpha-amylase, carcinoembryonic antigen, epithelial membrane antigen, cytokeratin as well as for expression of human salivary alpha-amylase messenger ribonucleic acid. The possibility of HSGA should be considered when an adenocarcinoma producing human salivary alpha-amylase is diagnosed away from sites where major and minor salivary glands normally are found.

Adenocarcinoma↗

Uterine sarcoma: can it be differentiated from uterine leiomyoma with Doppler ultrasonography? A preliminary report.

Our objective was to evaluate whether intratumoral-blood flow analysis could differentiate uterine sarcoma from uterine leiomyoma. Color and pulsed Doppler findings obtained from 41 patients with histologically proven uterine leiomyoma and five with uterine sarcoma (four leiomyosarcoma, one mixed mesodermal tumor) were retrospectively assessed. Intratumoral blood flow velocity waveforms were recorded, and the resistance index (RI) and peak systolic velocity (PSV) were calculated. There was no significant difference between the RI (median 0.647; range 0.422-0.896) in the uterine leiomyomas and the RI (median 0.663; range 0.330-0.774) in the uterine sarcomas. The PSV (median 61.6 cm/s; range 40.0-124.0 cm/s) in the uterine sarcomas was significantly higher (median 21.6 cm/s, range 6.3-48.6 cm/s) than that in the uterine leiomyomas (p < 0.05). When a cut-off value for the PSV of 41.0 cm/s (mean PSV of the uterine leiomyomas plus 2 standard deviations) was considered, the detection rate for uterine sarcoma was 80.0%, and the false-positive rate was 2.4%. These results suggest that the PSV within the tumor detected by color and pulsed Doppler ultrasonography could be useful for the preoperative differential diagnosis of uterine sarcoma.

Adult↗

Expression of thymidine phosphorylase in uterine sarcoma and uterine leiomyoma: association with microvessel density and Doppler blood flow analysis.

The aim of this study was to determine whether the expression of thymidine phosphorylase (TP) by uterine sarcoma and leiomyoma cells is associated with the density of microvessels within the tumor, and with Doppler ultrasound-derived peak systolic velocity (PSV) of blood flow. Sections of tissue from four uterine sarcomas and 41 uterine leiomyomas which had been used in a previous study to determine intratumoral peak systolic velocity were analyzed for the cellular expression of TP and the intratumoral density of microvessels by immunohistochemistry, using monoclonal antibody to TP and factor VIII-related antigen, respectively. The main outcome measures were whether or not the tumor cells were TP-positive or TP-negative, and the microvessel count within each tumor type. Uterine sarcomata were classified as TP-positive and uterine leiomyomata as TP-negative. The microvessel count in uterine sarcomas was significantly higher than that in uterine leiomyomas (p = 0.002, Mann-Whitney U test). We concluded that the expression of TP by uterine sarcoma cells is associated with an increase in microvessel density and with a higher peak systolic velocity.

Antibodies, Monoclonal↗

Intrauterine sonographic assessments of embryonic heart diameter.

Our purpose was to evaluate embryonic heart diameter in early first-trimester pregnancy using intrauterine sonography with a 20 MHz flexible catheter-based high-resolution real-time miniature transducer. A total of 40 women about to undergo therapeutic abortion from 6-9.9 weeks gestational age and one abnormal pregnancy with fetal hydrops at 9 weeks were studied with a specially developed catheter-based high-resolution real-time miniature (2.4 mm outer diameter) ultrasound transducer (20 MHz). A curvilinear relationship was found between the menstrual age and embryonic heart diameter (R2 = 95.7%), and a normal range of embryonic heart diameter for estimating the growth of the embryonic heart during early first-trimester pregnancy was generated. A normogram of menstrual age as predicted by embryonic heart diameter was also established. There was a good curvilinear correlation between embryonic heart diameter and crown-rump length (R2 = 90.1%). The embryonic heart diameter/crown-rump length ratio rapidly decreased from week 6 to week 7, and remained almost constant thereafter. Embryonic heart diameter (5.2 mm) in the case of fetal hydrops at 9 weeks was above the normal range. These results may provide an additional method of estimating gestational age in the early first trimester of pregnancy. In this limited series, a single case of embryonic heart enlargement was demonstrated, suggesting its potential use in the detection of embryonic congestive heart failure.

Abortion, Therapeutic↗

Three-dimensional ultrasonography in the first trimester of human pregnancy.

Our purpose was to visualize normal embryonal and fetal surface anatomical structures in the first trimester of human pregnancy by use of three-dimensional ultrasonography with a specially developed abdominal three-dimensional transducer. Four embryos and 31 fetuses of 8-13 weeks gestation were studied with a specially-developed abdominal three-dimensional transducer (3.5 MHz). This imaging system can provide conventional two-dimensional ultrasonography images and can also generate, within seconds, high-quality three-dimensional images in the surface and transparent mode with no need for an external workstation. The percentage of surface anatomical structures visualized at each gestational age interval using two-dimensional and three-dimensional ultrasonography is presented. Head and trunk were depicted in all cases. The number and the clarity of visualization of face, upper and lower extremities, hand, and foot increased with advancing gestation. The free loop of the umbilical cord was depicted in most cases. The number of depictions of abdominal cord insertion, midgut herniation, and yolk sac decreased with the increase of gestation. Genitals could not be identified in the first trimester. The ability to view some surface anatomical structures (face, hand, and foot) was better with three-dimensional ultrasonography than with two-dimensional ultrasonography. Three-dimensional ultrasonography provides a novel means for visualization of surface anatomical structures of the embryo and early fetus. These results suggest that three-dimensional ultrasonography can become an important modality in future embryological and early fetal research and in detection of embryonic and fetal developmental disorders in the first trimester of pregnancy.

Cross-Sectional Studies↗

Assessment of embryonic anatomy at 6-8 weeks of gestation by intrauterine and transvaginal sonography.

Our purpose was to compare the ultrasound visualization of the early first-trimester embryo using transvaginal and intrauterine sonography. In all, 32 women about to undergo therapeutic abortion at 6-8.9 weeks gestation were studied using a specially developed catheter-based, high-resolution, real-time miniature (2.4 mm outer diameter) ultrasonography transducer (20 MHz). Before the intrauterine sonographic procedure was performed, transvaginal sonographic assessment of the embryo was conducted. The parameters evaluated included the ability to visualize anatomical structures and a subjective assessment of the overall image clarity. The ability to view most organs was better with intrauterine sonography compared to transvaginal sonography, and this was especially true for the brain, spine, heart, liver, midgut herniation, extremities, and sacral tail. Moreover, it was possible to obtain finer image quality of very small embryonic structures with intrauterine sonography than with transvaginal sonography. Stomach, spleen, kidney, and bladder could not be depicted with both techniques. One cystic hygroma was diagnosed at 7 weeks 6 days using intrauterine sonography, but not with transvaginal sonography. Intrauterine sonography may provide additional information on the visualization of anatomical structures of the embryo in the early first trimester of pregnancy. In this limited series, one case of cystic hygroma was demonstrated and, thus, there is a potential for its use in the early detection of embryonic malformation. These results suggest that intrauterine sonography may be a valuable tool in imaging the early first-trimester embryo, complementing and not replacing transvaginal sonography in high-risk pregnancies.

Congenital Abnormalities↗

Elevation of serum interleukin-1 receptor antagonist levels in women with gynaecological cancers.

This study included 15 patients with gynaecological cancers (7 with cervical cancer, 6 with endometrial cancer, and 12 with ovarian cancer); 7 with benign gynaecological disorders (5 with benign ovarian tumour and 2 with uterine myoma); and 10 healthy women as a control group. Serum interleukin-1 receptor antagonist (IL-1 ra) levels in patients with gynaecological cancer were significantly higher than those in patients with benign gynaecological disorders (P = 0.04) and in healthy controls (P = 0.0009). IL-1 ra may play an important role in host immune responses in local and general environments against gynaecological cancers.

Endometrial Neoplasms↗

Effects of IL-4 on antigen-induced production of eosinophil chemotactic activity from human mononuclear leukocytes.

The effect of IL-4 on antigen-induced production of eosinophil chemotactic factors (ECF) from human peripheral blood mononuclear cells (PBMC) was examined. Antigen-induced ECF production was enhanced in a dose-dependent manner when PBMC were pretreated with IL-4. The most potent enhancement was induced by IL-4 at a concentration of 30 U in tuberculin-sensitive PBMC, and 3 U in Dermatophagoides farinae (Df)-sensitive PBMC. A short period of pretreatment (30 min to 3 h) was sufficient for the enhancement, whereas a longer period of treatment was less effective. IL-4 pretreatment suppressed PPD-induced IFNgamma and IL-5 production but enhanced ECF production. Furthermore, we found that Df induced IL-5 but not IFNgamma production from PBMC, and that IL-5 production was not affected by pretreatment with IL-4. Next, experiments were done to clarify whether the ECF produced by PPD-stimulated PBMC was different from that produced by Df-stimulated PBMC. It was thus found that the pI of both ECF was at about pH 7.0 and that unlike chemokines such as RANTES and eotaxin, they had no affinity for heparin.

Antigens↗

Plasma catecholamines and Doppler-derived cardiac time intervals in vaginally and cesarean delivered neonates.

OBJECTIVE: Our purpose was to compare Doppler-derived cardiac time intervals and cord plasma levels of catecholamines in vaginally and cesarean delivered neonates. METHODS: Doppler echocardiographic assessments of fetal and neonatal cardiac time intervals were made to determine differences in circulatory changes in 8 neonates delivered vaginally and 12 delivered by elective cesarean section. Aortic and pulmonary acceleration time (AT), ejection time (ET), and the AT/ET ratio in systole were assessed at various time points from antenatal to 72 h after delivery. Umbilical artery blood gas and acid-base values, and cord blood concentrations of epinephrine and norepinephrine were also measured. RESULTS: Umbilical artery blood pH in the cesarean section group was significantly lower than that in the vaginal delivery group (p < 0.05). Base deficit in umbilical artery blood and cord blood norepinephrine in cesarean delivered neonates were significantly higher than those in vaginally delivered neonates, respectively (p < 0.05). There were no significant changes in aortic cardiac time intervals between the 2 groups at any of the various time points. However, pulmonary AT and the AT/ET ratio were significantly lower in the normal vaginal delivery group than those in the cesarean section group 6 h after delivery (p < 0.05). CONCLUSIONS: The lower AT and AT/ET ratio of the pulmonary artery in vaginally delivered neonates may reflect an increase in pulmonary vascular resistance, indicating transient pulmonary hypertension. The findings were the reverse of what might be expected from an elevated pulmonary vascular resistance and transient pulmonary hypertension in cesarean delivered neonates.

Adult↗