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Biomedical subjects

F Hara

Publications and source records attributed to F Hara.

At least 55 records · Page 3Linked to original sources
PubMed1992

[Operative indications for tracheobronchomalacia].

Tracheobronchomalacia in 3 children and 4 adults was reviewed, and operative indications were investigated. Tracheobronchomalacia in children differed from that in adults in that the lesion was localized and spontaneous healing was effected by cartilage growth and hardening. In adults, tracheobronchomalacia was characterized by a notch on the expiratory flow volume curve and higher V peak of inspiratory flow volume curve than that of expiratory curve. Operative indications for tracheobronchomalacia are BP higher than 28.2 cmH2O and delta CT higher than 15.4 cmH2O. Of 2 patients with tracheobronchomalacia in whom airway pressure was measured, one was a candidate for operation, and in the other, surgery was contraindicated because of low BP due to chronic obstructive pulmonary disease.

Adult↗
PubMed1991

[Autonomic nervous activity in patients with chronic liver disease especially liver cirrhosis].

Fifty three patients with liver cirrhosis and other chronic liver disease were divided into three different groups according to severity (group I: non-cirrhotic group, group II: compensated cirrhotic group, group III: decompensated cirrhotic group) and were studied with regard to their autonomic nervous and general nervous activity. To estimate the patients' autonomic nervous activity, they were examined on the following items: 1) their subjective symptoms, 2) orthostatic dysregulation, 3) coefficient of variation in R-R interval in ECG (CVR-R) at rest, 4) minimum heart rate (MHR) at night, CVR-R at MHR at night, disparity in MHR between day and night (all three of these items measured using the Holter ECG), 5) serum adrenalin, noradrenaline, cyclic AMP, and cyclic GMP. Meanwhile, general nervous activity was evaluated by measuring the reaction time to sound and light stimuli and by performing a number connection test. Cardiac function was also measured using radionuclide angiography to study its relationship to autonomic nervous disturbance in patients with chronic liver disease. The results of autonomic nervous function tests, especially CVR-R at rest, MHR at night, CVR-R at MHR at night and the disparity in MHR between day and night, indicated a marked lowering of autonomic nervous function in group III. In the serological examination, serum noradrenaline. and cyclic GMP levels were significantly higher in groups II and III. The evaluation of general nervous function showed that the reaction time to sound and light stimuli was significantly slower in group III than in group I. The cardiac function test revealed no statistically significant differences between the groups. In conclusion, autonomic nervous disturbance in patients with chronic liver disease seems to increase gradually as the disease progresses and to emerge as a distinct clinical symptom chiefly at the decompensated stage of liver cirrhosis.

Adult↗
PubMed1991

[Radionuclide ventriculographic evaluation of exercised left ventricular performance in asymptomatic diabetic patients].

Radionuclide ventriculography was made in 49 asymptomatic diabetic patients, aged 30-70 years, to investigate cardiac function. Comparisons were made with 33 age- and sex-matched non-diabetic controls. Radionuclide ventriculography was performed at rest and during dynamic exercise by multigraded, supine bicycle ergometer. The resting left ventricular ejection fractions were similar between the diabetic patients and control subjects. No significant rise in the left ventricular ejection fractions during dynamic exercise was observed in the diabetic patients [58.4 +/- 9.8% (mean +/- SD) to 60.3 +/- 9.9]. In the control subjects, the left ventricular ejection fractions increased during dynamic exercise [59.3 +/- 8.4 to 63.0 +/- 11.4 (p less than 0.05)]. Peak ejection rates were similar in both groups at rest [-2.62 +/- 0.64 (s-1) vs -2.66 +/- 0.52] and during dynamic exercise [-3.25 +/- 0.74 vs -3.23 +/- 0.90]. Time to end-systole were similar in both groups at rest [315 +/- 42 (ms) vs 309 +/- 42] and during dynamic exercise [258 +/- 37 vs 262 +/- 37]. The resting peak filling rates were similar in both groups [2.27 +/- 0.62 (s-1) vs 2.45 +/- 0.58], and the peak filling rates increased (p less than 0.001) during dynamic exercise in both groups [2.68 +/- 0.61 vs 3.28 +/- 0.74]. However, the percent changes of the peak filling rates were significantly lower in diabetic patients (p less than 0.001). In four of the diabetic patients, hypokinesis of the intraventricular septum was observed.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

[The pulmonary function and histopathological studies of the lung in diabetes mellitus].

The pulmonary function and microscopic change of the lungs of diabetic patients were examined and compared with those of non-diabetic patients to assess the diabetic microangiopathy in lung. For pulmonary function study, spirogram flow-volume curve, diffusing capacity and arterial blood gas analysis were performed in 52 diabetic patients and 48 age- and sex-matched control subjects. Diffusing capacity, % vital capacity, total lung capacity, residual volume and 25% maximal expiratory flow were significantly less in the diabetic group than in the control group. PaO2 was also decreased in the diabetic group. There were no significant differences between the two groups in the other parameters. For histopathological study, the lungs of 35 autopsied cases of a diabetic group and 26 autopsied cases of a non-diabetic group. There were no significant differences in age and sex between the two groups. The two groups were compared and studied by measuring the thickness of alveolar capillary walls, pulmonary arteriolar walls and alveolar walls with a light microscope and an eye piece micrometer. The alveolar capillary walls, the pulmonary arteriolar walls and the alveolar walls had thickened significantly in the diabetic patients. These studies suggested that histological changes (microangiopathy) in the lungs are a cause of pulmonary function abnormalities.

Adult↗
PubMed1991

[Immunohistochemical study of the distribution of collagens (type I, III, IV), fibronectin, factor XIIIa and factor VIII related antigen in alcoholic liver disease].

Histopathological changes in alcoholic liver disease are characterized by Mallory body, fatty liver, and peculiar fibrosis such as pericentral fibrosis, pericellular fibrosis, stellate fibrosis originating from Glisson's sheath, and swelling of the liver cells. However, the mechanism of fibrosis remains unknown. The author tried to demonstrate, by the immunohistochemical method, fibronectin (FN), collagen type I, III, IV (IC, IIIC, IVC), factor XIIIa, and factor VIII related antigen (VIII RAg), all of which are related to the process of wound healing, in order to clarify the mechanism of fibrosis in alcoholic liver disease. With the progress of fibrosis, FN was demonstrated in the sinusoidal wall, as well as the portal areas and around the central veins. IC and IIIC were positive in the fibrotic area extending into the lobules and pericellular fibrosis. IVC was similar to FN and was positive in the sinusoidal wall. Scattered XIIIa positivity was recognized in the fibrotic areas, especially in the foci of active fibrosis. VIII RAg was positive in the capillary vessels invading the lobules through the limiting plates. The distribution of these proteins in the fibrotic area in alcoholic liver disease closely resembled that in the wound healing process. It is concluded that fibrosis occurring in the periportal area is essentially the same as in the wound healing process and the mechanism of fibrosis in alcoholic liver disease is thought to be active fibroplasia.

Adult↗
PubMed1991

[Studies on wedged hepatic venous pressure, hemodynamics and pulmonary function in patients with chronic liver disease, with reference to the differences between liver cirrhosis with chronic hepatitis].

In 17 compensated liver cirrhosis and 8 chronic hepatitis cases (no histories of cardiac or pulmonary disease), wedged hepatic venous pressure (WHVP), hemodynamics, and pulmonary function were measured and their clinical significance and interrelations evaluated. Both diseases were comparatively analyzed. WHVP was determined by wedging a catheter from the right femoral vein into the right hepatic vein. Hemodynamics was measured with a Swan-Ganz catheter. Spirography, flow-volume curve, closing-volume curve and pulmonary diffusion capacity were measured and aortic blood gas analyzed to assess pulmonary function. Esophageal endoscopy was used to diagnose the presence or absence of esophageal varices. The results showed that the group of liver cirrhosis patients featured elevated WHVP and a hyperhemodynamic pattern and a positive correlation between WHVP on the one hand and cardiac index and right left ventricle stroke work indexes on the other; there was a negative correlation between WHVP and the systemic vascular resistance and pulmonary vascular resistance indexes. The results showed an increase in oxygen consumption in the group of patients with esophageal varices. In all chronic hepatitis cases, findings were normal. Pulmonary function was characterized by abnormal %VC, PaO2, and pulmonary diffusion capacity in both groups along with abnormal PaCO2 in the liver cirrhosis group; no significant differences were noted between the two groups. These results indicate that liver cirrhosis elevates intarahepatic pressure, affecting systemic hemodynamics and resulting in a circulatory distribution disorder, leading to right and left ventricle overload and a decline in potential cardiac function. The results also indicated that mild pulmonary function disorder can occur as early in a state of chronic hepatitis.

Adult↗
PubMed1990

Heterogenous amplification of myc family oncogenes in small cell lung carcinoma.

One hundred forty-two foci of small cell lung carcinoma (SCLC) from 47 patients were examined for amplification of myc family oncogenes (c-myc, N-myc, and L-myc), by dot blot hybridization using formalin-fixed and paraffin-embedded materials which were resected surgically or obtained at autopsy. Some selected patients were also examined by in situ hybridization. Amplification of myc family genes was detected in 11 patients (23.4%) (c-myc in one, N-myc in five, and L-myc in five). Two of the 11 patients (one with N-myc and one with L-myc) had heterogenously amplified clones. In the patient with N-myc amplification, amplification was detected in metastatic tumors in the pancreas, lung, and pleura, but not in the liver and lymph node metastases. In the primary tumor, areas with and without N-myc amplification were seen. In the patient with L-myc amplification, although amplification was not detected in the surgically resected primary lesion, mediastinal lymph node metastatic lesions obtained at autopsy showed L-myc gene amplification. These two cases, together with previously reported evidence, suggest that myc gene amplification plays an important role in malignant progression, rather than development, of SCLC. In Stage III and IV groups, patients with over ten-fold myc gene amplification were suggested to survive for a shorter time than patients without such amplification (P = 0.06).

Aged↗
PubMed1988

Detection of amplified N-myc gene in neuroblastoma by in situ hybridization using the single-step silver enhancement method.

Amplification of the N-myc oncogene in 27 cases of neuroblastoma group tumor was examined by in situ hybridization using the single-step silver enhancement technique. The N-myc gene copy numbers of these neuroblastoma group tumors were previously examined by dot-blot hybridization using DNA extracted from formalin-fixed, paraffin-embedded tissues (H Tsuda et al., Lab Invest, 59:321, 1988). Silver grains were deposited just over the nuclei of tumor cells, but no or only faint deposition was observed over those of infiltrating lymphocytes, stromal fibroblasts, and endothelial cells. We judged a case to be positive for gene amplification when silver grains precipitated over the nuclei of the tumor cells to a greater extent than over nuclei of lymphocytes or endothelial cells in the same section. According to this criterion, 14 cases (12 cases of neuroblastoma and 2 cases of ganglioneuroblastoma) were positive for N-myc gene amplification of 27 cases (18 cases of neuroblastoma, 5 cases of ganglioneuroblastoma, and 4 cases of composite ganglioneuroblastoma). These results corresponded well to those of the dot-blot hybridization analysis using the same materials. Thirteen of 15 cases that carried 4 copies or more of N-myc gene were judged positive, and 11 of 12 cases that carried less than 4 copies of the N-myc gene were judged negative by in situ hybridization. In neuroblastoma group tumors with amplification of the N-myc gene, tumor cells were stained almost homogenously, except for two cases of ganglioneuroblastoma, in which less differentiated small round tumor cells were stained more intensely than differentiated ganglion-like cells.(ABSTRACT TRUNCATED AT 250 WORDS)

Cells, Cultured↗
PubMed1986

Autocrine regulation of glial proliferation and differentiation: the induction of cytodifferentiation of postmitotic normal glioblast by growth-promoting factor from astrocytoma cell.

A growth-promoting factor (GPF) from astrocytoma cells (GA-1) cultured in serum-free medium (N2) exerted on normal glioblasts proliferative and differentiation-promoting effects, which have been observed in glia maturation factor (GMF) stimulation. The serum-free conditioned media of GA-1 provoked DNA synthesis of glioblasts, and subsequently elicited a morphological differentiation characterized by the extrusion of processes as well as biochemical changes including an increased cellular level of glia fibrillary acidic protein (GFA protein), S-100 protein, and alpha-enolase. The transforming growth factor activity was also found in the media. Partially purified GPF had a molecular weight range of 7100-10,000 Mr and acidic isoelectric point (pH 4.6), and showed a susceptibility to heat treatment and denaturation at low and high pHs. The present results and the findings accumulated from our previous studies on gliotrophic growth factors provide a general concept of the growth and differentiation regulations of normal or neoplastic glial cells by growth factors through autocrine systems.

Animals↗
PubMed1986

[An autopsy case of epithelioid sarcoma--a review of the cases reported in Japan].

A 48-year-old Japanese woman died of a general metastasis of epithelioid sarcoma originating in the right palm, which had been irradiated for trichophytia therapy 30 years earlier and where a contraction of the fingers and recurrent ulceration for seven years despite several surgical treatments had occurred. Although the tumor cells in the biopsy materials consisted of both large ovoid and polygonal cells with deeply eosinophilic cytoplasm and spindle-shaped cells, no particular appearances for definite diagnosis were obtained. The epithelioid appearance of tumor cells was first recognized in the metastatic foci of the lungs and kidneys at autopsy. In addition, 20 cases of epithelioid sarcoma reported in Japan are reviewed.

Female↗