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T Iwasaka

Publications and source records attributed to T Iwasaka.

At least 289 records · Page 16Linked to original sources
PubMed1987

[Right ventricular function in patients with chronic right ventricular infarction].

To assess right ventricular function in patients with chronic right ventricular infarction, Tc-99m angiocardiography was performed in 64 patients one to three months after the onset of myocardial infarction. These patients were categorized into four groups according to their hemodynamic data in the acute stage using the Forrester classification: 39 patients in group I, 15 in group II, eight in group III and two in group IV. Mean right atrial pressure was nearly equal to or greater than diastolic pulmonary arterial pressure in all patients in group III. We calculated right ventricular ejection fraction (RVEF) and the right ventricular end-diastolic volume index (RVEDVI) as the parameter of right ventricular function, and assessed right ventricular wall motion using the right ventricular regional ejection fraction images (RVREFI). 1. RVEF in group III (25 +/- 3%) was significantly lower than those in groups I, II and IV (44 +/- 6%, 45 +/- 7% and 37 +/- 4%, respectively), and RVEF of all patients in group III was less than 30%. 2. RVEDVI in group III (150 +/- 25 ml/m2) was significantly greater than those in groups I, II and IV (74 +/- 20 ml/m2, 59 +/- 14 ml/m2 and 91 +/- 36 ml/m2, respectively). 3. RVREFI in group III decreased at the inferior and/or septal regions of the right ventricle, indicating wall motion abnormalities at the corresponding sites. 4. Six patients in group III were examined by coronary angiography and all had definite lesions in the proximal portion of the right coronary artery.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1986

Enhancement of colonization of Ureaplasma urealyticum in the mouse genital tract by estrogen treatment.

Experimental colonization by Ureaplasma urealyticum in the vagina of Balb/c mice was greatly enhanced by administration of estrogen, whereas it was not affected by treatment with progesterone. Ureaplasma was recovered from almost half of the estrogen-treated animals 7 days after inoculation, and the organism persisted in all of these animals until 21 days after inoculation; on the other hand, the organism was isolated in less than 20% of the untreated, progesterone-treated, or danazol-treated mice 7 days after inoculation and was no longer isolated in any of these groups 21 days after inoculation. At least a hundredfold more organisms were recovered from the estrogen-treated mice as compared to the untreated mice 14 days after inoculation and thereafter. U. urealyticum was also isolated from the uterine cavity and salpinx in approximately half of the mice in which the organism was isolated from the vagina.

Animals↗
PubMed1986

Genital mycoplasma colonization in neonatal girls.

Specimens obtained from the genital tract of 90 pairs of mothers and their female infants were cultured for Ureaplasma urealyticum (Ureaplasma) and Mycoplasma hominis (M.hominis). Ureaplasma and M.hominis were isolated from 80% and 17% of pregnant women, and 41% and 4.4% of female infants, respectively. Fifty nine per cent of infants were positive for Ureaplasma when they were borne per vaginam by Ureaplasma-positive mothers. However, Ureaplasma was not isolated from any of 11 infants delivered by cesarean section before rupture of the fetal membranes, in spite of positive colonization by Ureaplasma in the mothers. Quantitation of Ureaplasma revealed that neonatal colonization was closely associated with the colonization number of this microorganism in the cervical canal of mothers. Prolonged interval between rupture of fetal membranes and delivery caused a slightly increased frequency of isolation of this organism, but it was less significant. A study of mean birth weight revealed that there was no correlation between maternal or neonatal colonization by Ureaplasma and low birth weight.

Birth Weight↗
PubMed1986

[Clinical evaluation of specificity of serum CA125 as a tumor marker of ovarian carcinoma].

To evaluate whether elevated serum CA125 levels have specificity to ovarian malignancies, CA125 levels were measured in sera of 48 malignancies, 56 benign diseases and 40 healthy women. Furthermore serum CA125 levels were serially followed up in all the patients with positive serum CA125 levels (35 U/ml less than or equal to) to evaluate the correlation between serum CA125 levels and the response to treatment. Results obtained were as follows. A significantly higher positive rate (91%) of serum CA125 levels was observed in patients with ovarian malignancies than that (30%) in patients with other malignancies. Positive serum CA125 levels were also observed in patients with endometriosis, benign ovarian tumor, hydrosalpinx, uterine myoma and peritoneal tuberculosis. Serum CA125 levels in patients with malignancies depend on the volume of the solid part of the tumor irrespective of the tumor type. In patients with positive serum CA125 levels, rising or falling of the serum levels of this antigen correlated well with progression or regression of all kinds of diseases. These results suggested that a high positive rate of this antigen in patients with ovarian malignancies was not merely derived from the tumor specificity of this marker but partly from the fact that tumor sizes of ovarian malignancies were generally larger than those of other malignancies.

Adenocarcinoma↗
PubMed1986

Hormonal status and mycoplasma colonization in the female genital tract.

Three hundred seventy-four cervical or vaginal specimens from patients with various hormonal states were cultured for Ureaplasma urealyticum and Mycoplasma hominis. Significantly, low recovery rates of U urealyticum were obtained in the prepuberty (5%), puerperium (24%), and postmenopause (25%) groups, whereas pregnant women showed the highest incidence of U urealyticum (82%). The recovery rate of U urealyticum from neonates was 42%. The incidence of U urealyticum in sexually inactive females was significantly lower (40%) than that in sexually active nonpregnant women (67%). Significantly, a higher incidence (36%) was observed in postmenopausal women with a uterine cervix than in those whose cervix had been removed by surgery (10%). It is suggested that there is a close relationship between hormonal status and the occurrence of genital mycoplasmas. Possible modes of transmission of genital mycoplasmas other than sexual contact are also discussed.

Adolescent↗
PubMed1985

Atrial fibrillation in acute myocardial infarction.

To elucidate the genesis and effect of atrial fibrillation (AF), 102 patients with acute myocardial infarction were studied. Eighteen patients had AF during the first 72 hours in the coronary care unit. The hospital mortality rate was 23%. Discriminant analysis was used to determine the important variables contributing to the genesis of AF and hospital mortality based on the following variables: cardiac output, pulmonary capillary wedge pressure, right atrial pressure, systolic blood pressure (at admission and before the onset of AF or most abnormal value), age, location of infarction, sex and pericarditis. Pulmonary capillary wedge pressure, right atrial pressure and age were the important factors contributing to AF, whereas pulmonary capillary wedge pressure and age were important for hospital mortality. Therefore, the hemodynamic change imposed on the left atrium and aging are the major factors related to the occurrence of AF and hospital mortality.

Adult↗
PubMed1985

Diastolic time during recovery from upright exercise in persons without heart disease.

To assess the relation between heart rate and diastolic time (cardiac cycle minus electromechanical systole) during the recovery period from upright exercise, 12 normal volunteers were studied immediately after and 2 and 5 minutes after exercise in the upright position. Although heart rate was significantly lower at 5 minutes compared with 2 minutes after exercise (106 vs 116 beats/min), there was significant shortening of diastolic time (from 251 to 230 ms) and total diastole per minute (from 28,634 to 24,220 ms/min). The explanation of this phenomenon appears to be disproportionate lengthening of diastolic time at 2 minutes after exercise, which must represent physiologic response due to increased left ventricular filling as well as continuing adrenergic effects, which would be diminished at 5 minutes. This lengthening of diastolic time also would maintain decreased subendocardial blood flow caused by increased end-diastolic volume.

Adult↗
PubMed1985

Gestational trophoblastic disease in women aged 50 or more.

Twenty cases of gestational trophoblastic disease in women aged 50 or more are reported. The lesions were 7 hydatidiform mole (35%), 8 invasive mole (40%), and 5 choriocarcinoma (25%). The most common presenting symptom was abnormal vaginal bleeding. Three choriocarcinoma patients were postmenopausal and all of them had choriocarcinoma. None of the patients with hydatidiform mole or invasive mole died of the disease, but 4 of 5 choriocarcinoma patients died of the disease. Because of the high rate (56.3%) of malignant sequelae after molar evacuation, a primary hysterectomy for the treatment of hydatidiform mole in this age group is recommended. It is important to maintain a high level of suspicion for the diagnosis of gestational trophoblastic disease in the elderly women.

Age Factors↗
PubMed1985

Multistep transformation by defined fragments of herpes simplex virus type 2 DNA: oncogenic region and its gene product.

Diploid Syrian hamster embryo cells transfected with Bgl II C fragment of herpes simplex virus type 2 DNA acquired a neoplastic phenotype. Cultures transfected with its left-hand 64% subclone EcoRI/HindIII fragment AE (0.419-0.525 map unit) grew into established but nontumorigenic lines. Transfection of EcoRI/HindIII AE-immortalized cells with a 4.4-kilobase Sac I/BamHI subfragment within BamHI E (0.554-0.584 map unit; overlaps the right-hand 16% of Bgl II C) converted them to tumorigenicity. The 4.4-kilobase subfragment encodes a 144-kDa protein immunologically and structurally similar to an infected cell protein designated ICP 10. DNA extracted from cells transformed with the 4.4-kilobase subfragment exhibited discrete hybridizing bands homologous to BamHI E fragment. Monoclonal antibody to ICP 10 precipitated a 144-kDa protein from the transformed cells and stained them in immunofluorescence. A tumor derivative established with the transformed cells did not stain with this antibody, but approximately equal to 25% of the cells stained with a monoclonal antibody to c-myc protooncogene products.

Animals↗
PubMed1985

The cervical tumor-associated antigen (ICP-10/AG-4) is encoded by the transforming region of the genome of herpes simplex virus type 2.

BglII fragment C mapping between 0.416 and 0.580 map units (mu) on the herpes simplex virus type 2 (HSV-2) genome was used for in vitro translation to identify proteins encoded on this fragment. RNA homologous to the BglII C fragment directs the synthesis of three proteins with approximate molecular weights of 144,000, 52,000 and 27,000. The 27,000 dalton protein is encoded by sequences within the EcoRI/HindIII AE fragment (0.419-0.525 mu) that overlap the immortalizing sequences within BglII C. The 144,000 (144K) and 52,000 dalton proteins are encoded by sequences within the BamHI "e" fragment of HSV-2 DNA (0.535-0.585 mu). The 144K protein is the only species translated in vitro from mRNA hybrid-selected from cells arrested in the "early" (beta) phase of viral protein synthesis. It is precipitated by anti-ICP-10 serum and by monoclonal antibody 48S (previously shown to precipitate the HSV-induced ribonucleotide reductase). The 48S antibody competes with the anti-ICP-10 serum for the 144K protein. Furthermore the in vitro translated 144K protein is structurally similar to ICP-10, an HSV-2-infected cell protein that is antigenically identical to AG-4, the cervical tumor-associated antigen.

Antigens, Neoplasm↗
PubMed1985

Endometriosis associated with ascites.

Pelvic endometriosis associated with massive ascites is an unusual occurrence. Only 12 cases have been reported since 1954 when Brews first described this entity. The authors present two cases recently encountered at Saga Medical School Hospital. Clinical courses and operative findings are described and other cases from the literature are reviewed. The possible etiologic mechanisms of the ascites are explored and the possibility of conservative surgery and hormonal therapy with danazol is discussed.

Adult↗
PubMed1985

[Establishment and characterization of a cell line derived from mucinous cystadenocarcinoma of human ovary].

A human tumor cell line MCAS, which was derived from mucinous cystadenocarcinoma of the ovary, was established. The tissue specimen was obtained on December 1, 1983 and the culture was maintained in Ham's F-12 medium supplemented with 20% fetal calf serum. Continuous growth made possible cell transfer every 3-5 days and the seventy-third passage was achieved on August 15, 1984. This cell line has the following characteristics. The doubling time of the MCAS cell line was 27 hours and the saturation density was 5.1 X 10(4)/cm2. The cultured cells appeared monolayer and the cellular arrangement was a pavement-like pattern. Rather large cells with vacuoles in the cytoplasm appeared in the confluent state and PAS staining proved to be positive specifically in these large cells. A chromosomal analysis revealed a peritetraploid tendency. By heterotransplantation of MCAS cells to the nude athymic mouse, the tumor developed and had both cystic and solid components. The cystic content was mucinous. Histopathological diagnosis of the tumor was papillary adenocarcinoma and alcian blue staining was positive. The characteristics of the original mucinous cystadenocarcinoma have been precisely maintained in this cell line.

Animals↗