Search PubMed⌕ Search

Biomedical subjects

M Kawamoto

Publications and source records attributed to M Kawamoto.

At least 163 records · Page 9Linked to original sources
PubMed1991

[Simplified prediction of postoperative lung function by plain chest roentgenogram in patients with primary lung cancer--in correlation to postoperative respiratory complications].

For the purpose of simplification of prediction of postoperative lung function, we studied to predict lung function by analizing the frontal and lateral view of chest plain roentgenogram and investigate the correlation to respiratory complication on 111 patients with lung cancer. According to TNM classification of lung cancer, prediction was performed as follows. Predicted postoperative lung function = [(42-number of resected subsegments)/(42-number of occupied subsegments)] x preoperative VC or FEV1.0. In this formula, 42 was the number of functioning subsegments of whole lung (right: 22, left: 20), and then preoperative occupied subsegments was ordered by T factor, where T1 lesion in lung field was prescribed as 1 subsegment and T2 was more than 2 subsegments respectively in plain chest roentgenogram. And also, on the patients having hilar lesions, it was required to calculate the number of subsegments in atelectasis, peripheral obstructive pneumonia and/or partial emphysematous change due to intrabronchial lesions. There was uniformly positive correlations in VC (R = 0.7949) and FEV1.0 (R = 0.8235) of the patients studied respectively. The patients having pneumonectomy showed tendency of over estimation, on the other hand, the patients having resection of a few segments showed under estimation. To predict the postoperative respiratory condition, we calculated the predicted post-operative %VC and %FEV1.0 for predicted preoperative normal VC and FEV1.0. Above the al, we tried to investigate the correlation with predicted postoperative %VC, %FEV1.0 and postoperative respiratory complications.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1991

[Studies on increased sputum after bronchoplastic surgery for lung cancer in correlation with hemodynamics and extravascular lung water].

In surgical treatment for lung cancer, large amount of intrabronchial sputum and secretion was occasionally encountered in patients, especially underwent bronchoplastic surgery. It has been discussed as causes which was affected from transection of pulmonary branches of vagal nerve and bronchial arteries. So we have measured pre- and postoperative hemodynamics and extravascular lung water (EVLW) at the bedside, as to investigate the correlation with formyl sputum and increase of right ventricular afterload which was presumed by lung resection and bronchoplasty. Respiratory complication was classified by the incidence of forced bronchial toilet in acute phase. Seven patients were investigated. Three of seven showed white sputum which was difficult to excrete. EVLW was 9.91 +/- 2.12 ml/kg in average before operation and then showed a tendency to increase within 102 +/- 29% of percent exchange (delta %) between pre- and postoperation. As to comparison of delta % of EVLW in acute period, the patients underwent bronchoplastic surgery showed a tendency to increase rather than the patients underwent lobectomy. According to former studies, we found the uniform correlation R = 0.7075 between observed EVLW and predicted postoperative EVLW estimated by prediction of residual functioning lung volume before operation. And also, the patients showing postoperative EVLW more than predicted EVLW before operation had a tendency to increase amount of sputum. Furthermore, concerning hemodynamic changes, pulmonary arterial resistance index (PARI) elevated to 196 +/- 165% (83-515%) in average associated with increased right ventricular stroke work index (RVSWI) as a result of compensatory changes for increased right cardiac afterload.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1990

Determination of tryptophan and its metabolites in human plasma and serum by high-performance liquid chromatography with automated sample clean-up system.

An automated high-performance liquid chromatographic method that incorporates direct injection of biological samples followed by chromatographic sample clean-up in a precolumn is described for the determination of tryptophan and its metabolites in human plasma and serum. The system gave reproducible data with a coefficient of variation of less than 3% with a sample size of 100 microliters of human plasma. The major tryptophan metabolites found in 100 microliters of human plasma were kynurenine, indolelactic acid, indoleacetic acid, indolepropionic acid, serotonin and 5-hydroxyindoleacetic acid. The level of tryptophan and kynurenine in individuals was constant in comparison with other metabolites. Analysis of samples from normal controls, diabetics, gravida and their foetuses showed a tendency for tryptophan metabolites to be low in maternal plasma.

Autoanalysis↗
PubMed1990

Role of elastic fiber degradation in emphysema-like lesions of pulmonary lymphangiomyomatosis.

To study the pulmonary structural remodeling in pulmonary lymphangiomyomatosis, electron microscopy and light and electron microscopic immunohistochemical observations for elastin and alpha 1-antitrypsin were performed on five open lung biopsy samples. Lung specimens showed emphysema-like changes in areas of abnormally accumulated smooth muscle cells. In the alveolar walls having accumulated smooth muscle cells, elastic fibers were decreased in number, disrupted, granular, and occasionally accumulated. Ultrastructurally, elastic fibers in areas of smooth muscle cell accumulation showed poorly outlined amorphous components and a few microfibrils, and occasionally showed electron-dense granular deposits in and around the amorphous components. Spiraling collagen fibrils were frequently found associated with these abnormal elastic fibers. Immunohistochemistry for elastin showed even staining of amorphous components of elastic fibers in the areas of smooth muscle cell accumulation. alpha 1-Antitrypsin was also detected evenly in amorphous components of elastic fibers in the areas of smooth muscle cell accumulation. It is proposed that the emphysema-like lesions of lymphangiomyomatosis are mediated by the degradation of elastic fibers, and these degraded elastic fibers are related to an imbalance of the elastase/alpha 1-antitrypsin system similar to the probable pathogenesis of emphysema.

Adult↗
PubMed1990

Cell proliferation during the process of bleomycin-induced pulmonary fibrosis in rats.

To elucidate the relationship between cell proliferation and structural remodeling in pulmonary fibrosis, light and electron microscopy with immunohistochemistry for bromodeoxyuridine (BrdU) and morphometry for BrdU-positive cells were performed following a single intratracheal instillation of bleomycin in rats. The results showed that terminal bronchiolar epithelial cells, Type II alveolar epithelial cells and interstitial cells began to proliferate 2 days after the injury. Then each cell type showed a different style of proliferation. Interstitial cells which were located in the interstitium and migrated into intraalveolar spaces proliferated, then produced intra-alveolar fibrosis. Terminal bronchiolar epithelial cells proliferated rapidly and formed alveolar bronchiolization with squamous metaplasia in areas where alveoli were severely damaged and intraalveolar fibrosis was formed, and thereafter the proliferation ceased within 2 weeks. The degree of proliferation of type II alveolar epithelial cells and interstitial cells was rather slight, but continued constantly until the later stage. In addition, intraalveolar macrophages were BrdU-positive from an early stage. Endothelial cell proliferation was observed in small vessels and alveolar capillaries at 1 week after bleomycin instillation. Rapidly proliferating bronchiolar epithelial cells which formed alveolar bronchiolization with squamous metaplasia were important in preventing the progress of intraalveolar fibrosis, because the proliferation of type II alveolar epithelial cells was limited.

Administration, Oral↗
PubMed1990

Factor VII deficiency first observed at preoperative routine clotting test.

Factor VII deficiency was first observed in a 24-year-old female in the routine clotting test for tooth extraction. Her factor VII was 22%, mildly below normal limits. Factor IX complex was not administered as replacement therapy when her impacted tooth was extracted. There was no sign of abnormal postoperative bleeding. As this disease was a rare disorder, the minimum safe level of factor VII for tooth extraction was unknown. We had a opportunity to study a patient with this disorder observed in the preoperative routine clotting test for tooth extractions.

Adult↗
PubMed1990

[A case of malignant aortico-pulmonary paraganglioma].

A 64-year-old male was admitted to our hospital suffering from dysphagia and dyspnea. The chest X-ray films and chest CT films revealed huge tumor in his upper-anterior mediastinum. The filling defect at lower rim of the left brachiocephalic vein on venography indicated malignant potential of the tumor. There was no abnormal value in blood and urine examinations except CA 19-9 which was 31.8 U/ml. The tumor was resected with bilateral pleura, pericardium and left brachiocephalic vein. Macroscopically the specimen accompanied with a lot of bleeding spots was soft and yellow and has no capsule. The size of tumor was 15 X 13 X 8 cm and its weight was 865 gm. No tumor recurrence was found until present time: two years after surgical therapy followed by adjuvant radiation therapy (60 Gray). Though histological findings of anterior part of the tumor were consisted of "Zellballen" cells and bleedings, the posterior part had cell atypia and invasion into vessels. These cells were slightly positive on Keratin stain and on NSE stain. Typical findings of paraganglioma were also indicated by electron microscopy: those findings were more chief cells, fewer sustentacular cells, abundant mitochondria and few dense-cored granules which are thought to secrete hormonal substances. Judging from these clinical and pathological results, this tumor was diagnosed nonfunctional aortico-pulmonary paraganglioma. Mediastinal paraganglioma is a very rare tumor. There is no report of malignant aortico-pulmonary paraganglioma in Japan after Glenner and Grimelys' study concerning extra-adrenal paraganglion system.

Aorta↗
PubMed1990

Paraquat inhibits the lipid peroxidation caused by carbon tetrachloride in guinea pig liver microsome.

Pentane, which is an index of lipid peroxidation, was formed in a mixture of microsomes, carbon tetrachloride (CCl4) and NADPH. Trichloromethyl radical adduct of the N-tert-butyl-alpha-phenylnitrone-trichroromethyl (BPN) was also formed in the mixture with BPN. The formation of pentane and the radical adduct were reduced in the presence of paraquat. Furthermore a spectrophotometric study showed that substrate-induced difference spectra in the Soret region (Type I) caused by CCl4 and microsomes were changed after adding paraquat. We conclude that paraquat inhibits the lipid peroxidation mediated by the radical intermediate of CCl4 by inhibiting the mixed function oxidase system.

Animals↗
PubMed1990

[Healing of the operative cardiac wound in postinfarction ventricular septal perforation].

We studied the healing processes of operative cardiac wound around the patch on 8 patients (5 males, 3 females), who survived 6 to 147 days postoperatively for postinfarction ventricular septal perforation. The perforation was repaired either with a Dacron patch or with a Teflon-backed glutaraldehyde-preserved equine pericardium (Xenomedica). The patients with the Xenomedica patch had no perioperative bleeding or residual shunting across the patch. However, our long-term observations show that the patch is not covered with neoendocardium after 5 months and thus may pose a greater risk for thrombus formation, embolisms or infections; For instances, one case with mural thrombus formation and two cases of infection around the patch were observed. Therefore, while the Xenomedica patch may provide advantages in the immediate postoperative period, long term results indicate that this patch is inferior to the Dacron patch. We have also observed that the progress of healing was different on the patch between the right and left surface. Neoendocardium was observed on the 30th postoperative day on the right sided surface of the Darcron patch, while only pseudoneointima (mostly fibrinous membrane) with a few endothelial cells were found on the left side. The healing of infarcted myocardium was slower in these patients with patch than in patients with myocardial infarction without operation. Even after 62nd postoperative day, scarring was still incomplete, only granulation tissue was observed. Certainly, the operative trauma including the effect of extracorporeal circulation and postoperative low output syndrome may contribute to this finding. Suture insufficiency occurred in 4 cases, which may be associated with the delayed wound healing.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1989

Increased immunoreactive neuropeptide Y in platelets of spontaneously hypertensive rats (SHR).

A high concentration of immunoreactive neuropeptide Y was observed in rat platelets using a specific and sensitive radioimmunoassay for neuropeptide Y. Three kinds of high performance liquid chromatography combined with radioimmunoassay for neuropeptide Y showed that immunoreactive neuropeptide Y in rat platelets is identical to rat authentic neuropeptide Y. To investigate the pathological role of platelet neuropeptide Y in genetic hypertensive rats, the platelet content and plasma concentration of neuropeptide Y were measured by a sensitive radioimmunoassay for rat neuropeptide Y in 5-, 10- and 15-wk old spontaneously hypertensive rat and age-matched Wistar Kyoto rat. Platelet content of immunoreactive neuropeptide Y in 5-, 10- and 15-wk old spontaneously hypertensive rat was higher than that in Wistar Kyoto rat at each age. No difference was observed in plasma concentration of immunoreactive neuropeptide Y between spontaneously hypertensive rat and Wistar Kyoto rat at each age.

Animals↗
PubMed1989

Mutagenicity studies on fenitrothion in bacteria and mammalian cells.

The mutagenicity of fenitrothion was determined in strains of Salmonella typhimurium and Escherichia coli. Fenitrothion was found to be non-mutagenic in Salmonella typhimurium strains of TA98, TA1535 and TA1537 and in Escherichia coli WP2uvrA both with and without S9 mix, while weak mutagenicity was observed only in Salmonella typhimurium TA100 and enhanced by the addition of S9 mix. The mutagenicity observed in the TA100 strain was not expressed in a nitroreductase-deficient strain, TA100 NR, and decreased in a transacetylase-deficient strain, TA100 1,8-DNP6. The mutagenicity of fenitrothion was also examined by a gene mutation assay using the gene for hypoxanthine-guanine phosphoribosyltransferase (hgprt) in V79 Chinese hamster lung cells. Fenitrothion did not induce any increment of 6-thioguanine-resistant mutant cells at doses ranging from 0.01 to 0.3 mM regardless of the presence or absence of S9 mix. These results suggest that reduction of fenitrothion by a bacterial nitroreductase of TA100 to an active form is essential for the expression of the mutagenicity of fenitrothion in TA100 and that a bacterial transacetylase of TA100 also has an important role in the process of mutagenic activation.

Animals↗
PubMed1989

[An early combined endodermal sinus tumor of the ovary that was diagnosed due to torsion of serous cystadenoma--a case report].

Reported is a rare case of a 2.5cm endodermal sinus tumor (EST) that was included within a 11 x 10.5 cm serous cystadenoma. A 24-year-old female suddenly complained of abdominal pain caused by having undergone an intestinal torsion of a left ovarian tumor. After a unilateral salpingo-oophorectomy the serum AFP was 219.8 ng/ml. The patient then received two cycles of cis-platinum, vinblastine and bleomycin combination chemotherapy. After one cycle, the serum AFP decreased to a normal level and the woman has remained free of disease 6 months after the discovery of her tumor. In this case, fortunately, this torsion of a serous cystadenoma enabled us to find the EST at a very early stage.

Adult↗
PubMed1989

Inhibitory effect of paraquat on biotransformation of halothane in rabbit liver microsomes.

Microsomal fractions were prepared from the liver of rabbits to investigate the effects of paraquat (methyl viologen) on generation of metabolites of halothane under the optimal aerobic and anaerobic conditions. Halothane (CF3CHClBr) is known to undergo oxidative and reductive biotransformation in the hepatic mixed function oxidase system including cytochrome-P450 reductase and cytochrome P450. The results showed that paraquat inhibited generation of metabolites of halothane under these conditions. Generation of the aerobic metabolite, trifluoroacetic acid (CF3COOH), and anaerobic metabolites, 2-chloro-1, 1, 1-trifluoroethane (CF3CH2Cl) and 2-chloro-1, 1-difluoroethylene (CF2CHCl), were inhibited 50% by 4.96 mM and 35.3 mM paraquat, respectively. Possible mechanisms were speculated on to account for the inhibitory effects: one being the impaired formation of halothane-cytochrome P450 complex by addition of paraquat, and the other the diversion of electrons from cytochrome-P-450 reductase to generate active paraquat radicals. It is concluded that paraquat inhibits NADPH-dependent biotransformation of halothane catalyzed in mixed function oxidase system.

Animals↗
PubMed1989

[Clinical studies and sputum levels of ceftriaxone once daily administration in respiratory tract infection].

Ceftriaxone (CTRX), a new cephalosporin, was investigated by once daily administration for its clinical efficacy and safety on respiratory tract infections. The results obtained are summarized as follows: 1. Clinical responses to CTRX of a total of 39 cases with respiratory tract infections were excellent in 12 cases, good in 23, fair in 3, poor in 1 with an efficacy rate of 89.7%. Against acute bronchitis, lung abscess, bronchiectasis, chronic bronchitis and obstructive pneumonia, efficacy rates were 100%. 2. Serum levels and urinary excretion rates of CTRX were investigated in 2 cases after intravenous drip infusion of the drug at doses of 1 g and 2 g, respectively. Although urinary excretion rate tended to decrease with the deterioration of renal functions, prolongation of serum half-life was slight in those patients with normal liver function. In 1 case, it remained at 1.9 micrograms/ml at 12 hours and in another at 0.9 microgram/ml at 22 hours in sputum. According to the results, it appears that once daily administration of CTRX is effective and well tolerated in patients with acute respiratory infections.

Adult↗
PubMed1989

[Perioperative management of patients with dilated cardiomyopathy].

Dilated cardiomyopathy (DCM) is defined as a syndrome of dilated ventricles with gross impairment of ventricular systolic function. However, few reports on perioperative management of DCM were obtainable. This paper describes perioperative management of two patients with DCM. A 72-year-old man, whose DCM had been treated with medication, was planned for gastrectomy. His cardiac signs indicated NYHA class II. Cardiac function, evaluated prior to the surgery with echocardiography to determine an operative indication, turned out to be well compensated. Minimal cardiac derangements were anticipated perioperatively. The procedure was carried out under general anesthesia with neuroleptanalgesia utilizing butorphanol and vasoactive agents. No circulatory complications were observed throughout the surgery. A 66-year-old man, who had long-standing heart disease, hemiplegia and hydronephrosis due to ureteral stone, was planned for percutaneous nephrolithotomy. However, the planned surgery was withdrawn because he had DCM with minimal compensatory function and perioperative cardiac derangements were anticipated according to the categorized data classified with echocardiography. We conclude that preoperative assessment of cardiac function is essential to minimize perioperative cardiac derangements in patients with DCM.

Aged↗