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Biomedical subjects

J Katoh

Publications and source records attributed to J Katoh.

At least 19 recordsLinked to original sources
PubMed2000

[Swallowing rehabilitation using balloon catheter treatment evaluated by videofluorography in an elderly patient with Wallenberg's syndrome].

A 65-year old man was admitted with severe dysphagia, ataxia and aspiration pneumonia. Dysphagia and ataxia were caused by lateral medullary infarction (Wallenberg's syndrome). The swallowing abnormality was assessed by videofluorography and we attempted the balloon dilatation method for cricopharyngeal dysphagia. Three months after initiation of swallowing training, videofluorography (VF) showed that the magnitude of aspiration to the trachea had decreased and the patient began taking food by mouth. The balloon dilatation method is successful for chronic stage cricopharyngeal dysphagia and the VF test is useful for quantitative assessment of dysphagia and for deciding when to start oral intake in elderly patients.

Aged↗
PubMed2000

[Activities of antimicrobial agents against 5,180 clinical isolates obtained from 26 medical institutions during 1998 in Japan. Levofloxacin--Surveillance Group].

The surveillance study was conducted to determine the antimicrobial activity of fluoroquinolones (ofloxacin, levofloxacin, ciprofloxacin, tosufloxacin) and other 20 antimicrobial agents against 5,180 clinical isolates obtained from 26 medical institutions during 1998 in Japan. The resistance to fluoroquinolones was remarkable in Enterococci, methicillin-resistant staphylococci and Pseudomonas aeruginosa from UTI. However, many of the common pathogens such as Streptococcus pneumoniae including penicillin-resistant isolates, methicillin-susceptible Stahylococcus aureus, Moraxella catarrhalis, the family of Enterobacteriaceae, Haemophilus influenzae including ampicillin-resistant isolates have been kept to be susceptible to fluoroquinolones. About 90% of P. aeruginosa isolates from RTI were susceptible to fluoroquinolones. In conclusion, the results from this surveillance study suggest that fluoroquinolones are useful in the treatment of various bacterial infections including respiratory infections.

Anti-Infective Agents↗
PubMed1999

Comparison of venoarterial versus venovenous access in the cerebral circulation of newborns undergoing extracorporeal membrane oxygenation.

This study was designed to compare venoarterial (VA) with venovenous (VV) access in the cerebral circulation of newborn infants during extracorporeal membrane oxygenation (ECMO). Among 14 infants with VA ECMO, 7 had no intracranial complications (group 1), while the others (group 2) developed intracranial hemorrhage (ICH). In contrast, among 19 infants with VV ECMO, only 1 developed ICH. Serial echocardiograms were performed before and after 1, 6, 12, and 24 h and 2 and 3 days of ECMO. The mean cerebral blood flow (CBF) velocities were measured in the anterior cerebral artery (ACA), right and left internal carotid arteries (Rt, Lt-ICA), basilar artery (BA), and right and left middle cerebral arteries (Rt, Lt-MCA). Ejection fraction (EF), cardiac output (CO), and stroke volume (SV) were also measured using standard echography. The velocity levels in the ACA, Rt-MCA, and Lt-MCA in VA ECMO were lower than those in VV ECMO, while those in the Lt-ICA and BA in VA ECMO were higher than those in VV ECMO. The EF, CO, and SV were lower in cases of VA ECMO than in VV ECMO. In cases of VA ECMO, there were no differences between groups 1 and 2 in velocities in the ACA, Rt-ICA, or Lt-ICA. However the velocities in group 2 in the BA, Rt-MCA, and Lt-MCA were lower than those in group 1 before and during ECMO. Similarly, the EF, CO, and SV were lower in group 2 (12.0%-31.0%, 0. 10-0.32 l/min, and 0.66-1.55 ml, respectively) than in group 1 (29. 5%-49.3%, 0.25-0.63 l/min, and 2.15-3.85 ml) during ECMO. However, in the infants on VV ECMO the CBF was either maintained or gradually increased before and during ECMO. Their cardiac parameters were: EF 46.1%-53.0%, CO 0.43-0.52 l/min, and SV 2.72-3.84 ml during ECMO. It is concluded that in VA ECMO CBF velocities, particularly in infants who developed ICH, decreased after the onset of ECMO in association with poor cardiac function, while in VV ECMO they were stable, probably due to normal systemic hemodynamics and cardiac function.

Arteriovenous Shunt, Surgical↗
PubMed1999

Fasting insulin and leptin serum levels are associated with systolic blood pressure independent of percentage body fat and body mass index.

OBJECTIVE: To examine the relationship between leptin and insulin serum levels and systolic and diastolic blood pressure in young men. SETTING: Kobe University of Mercantile Marine, Kobe, Japan. PARTICIPANTS: One hundred and ninety-eight male students aged 18-20 years (comprising 100% of those eligible). DESIGN AND MEASUREMENTS: A cross-sectional survey of a sample of male college students was performed, with measurements to include anthropometry, blood pressure and blood tests after overnight fasting. RESULTS: Compared with 90 men with an optimal blood pressure, 56 men with high-normal and high blood pressure had an increase in body mass index (23.7 +/- 5.2 versus 20.4 +/- 2.2 kg/m2), percentage body fat (21.7 +/- 8.0 versus 16.3 +/- 4.2%) and serum leptin (3.7 +/- 4.7 versus 1.5 +/- 0.8 ng/ml). In addition, they had greater serum insulin (59 +/- 31 versus 43 +/- 12 pmol/l) despite there being no differences in plasma glucose, resulting in a reduction of the ratio of glucose to insulin (x 10(6)) (107 +/- 43 versus 126 +/-, which is an estimate of insulin sensitivity in a nondiabetic population. Furthermore, the 56 men had higher serum triglyceride levels, although there was no difference in low density lipoprotein-cholesterol and high density lipoprotein-cholesterol between men with optimal and high-normal plus high blood pressure. Similar differences were found between men in a top versus low tertile of systolic and diastolic blood pressure. In multiple regression analysis, both log leptin and log insulin emerged as determinants for systolic blood pressure independent of body mass index and percentage body fat, but an association with diastolic blood pressure was only shown for log leptin. CONCLUSION: Hyperleptinemia and hyperinsulinemia may be regulators of arterial pressure, independent of body mass index or percentage body fat.

Adipose Tissue↗
PubMed1999

Use of PCR serum in diagnosing and monitoring cytomegalovirus reactivation in bone marrow transplant recipients.

We previously reported that the use of polymerase chain reaction (PCR) in detecting cytomegalovirus (CMV) DNA in serum (sPCR) enables the detection of CMV viremia, which has not been possible with other methods. In this study, the clinical usefulness of sPCR was investigated by comparison with the results of three other diagnostic methods, i.e., antigenemia assay (AG), shell vial culture test (shell vial), and complement-fixing (CF) antibody titer. The present study included 26 patients with hematological diseases who had undergone allogeneic bone marrow transplantation (BMT). A total of 347 samples were collected, and the results of the sPCR and AG methods were in agreement in 91.1% of the samples. When a subject was positive in both the sPCR and AG tests, and the other two tests (shell vial and CF) were also positive, CMV reactivation was surmised as definite. When only the result of the shell vial test or the CF test was positive, these results were taken as false-positives. The time at which the samples became positive in each of these four tests was 7.5 weeks post-BMT for sPCR, 7.0 weeks post-BMT for the AG test, 7.4 weeks post-BMT for the shell vial test, and 9.7 weeks post-BMT for the CF test. Thus, it was found that samples became positive at almost the same time for the sPCR, AG, and shell vial tests. Interstitial pneumonitis (IP) due to CMV developed in 3 subjects. These cases were positive in the sPCR, AG, and shell vial tests prior to the manifestation of symptoms of IP. The CF test did not become positive until after the onset of the disease. As the IP due to CMV was controlled with treatment, the sPCR and AG tests became negative. With the shell vial and CF tests, on the other hand, the test results continued to be positive even after the IP was cured. These findings demonstrate that the sPCR test method--like the AG test--yields few false-positive results. Therefore, the sPCR method is useful in early diagnosis of reactivation of CMV and for evaluation of the efficacy of therapy administered for IP. In addition, sPCR can be performed simultaneously on a large number of samples, and the evaluation of the test results is simple. We conclude that the sPCR test may be superior to the three other diagnostic methods for evaluation of serum samples from multiple institutions.

Adolescent↗
PubMed1998

Thoracotomy for a patient with Stevens-Johnson syndrome: report of a case.

Stevens-Johnson syndrome (SJS) is an uncommon eruptive disorder of the skin and mucous membranes with systemic manifestation. It is extremely unusual for patients with a past history of SJS to present with indications for surgery necessitating thoracotomy. We describe herein the perioperative management of a patient with SJS who underwent surgery for a spontaneous pneumothorax.

Female↗
PubMed1998

Cimetidine reduces impairment of cellular immunity after cardiac operations with cardiopulmonary bypass.

OBJECTIVE: Depressive effects of cardiopulmonary bypass on cell-mediated immune responses may lead to postoperative infectious complications. We previously reported that cimetidine reduced postbypass depression of the cytotoxic activity of natural killer cells. This study evaluated cimetidine as an agent to preserve cellular immunity after cardiac operations. METHODS: In a prospective randomized study, 20 patients were divided into two groups of equal size. Cimetidine-group patients received 400 mg of cimetidine intravenously before bypass and a 33 mg/hr intravenous infusion of cimetidine after the operation, continuing until the fifth postoperative day. Control-group patients received conventional perioperative therapy. Lymphocyte subsets, natural killer cell activity, percentage of CD56+CD16+ (percentage of natural killer cells), and percentage of CD11b+CD8+ (percentage of suppressor T lymphocytes) were measured perioperatively. RESULTS: Although temporary postoperative reductions in percentages of CD3+, CD4+, and CD56+CD16+ cells were observed in both groups, CD8+ percentages on postoperative day 1 and CD11b+CD8+ percentages on postoperative days 1 and 3 in the cimetidine group were significantly lower compared with those in the control group (p = 0.01,p = 0.004, andp = 0.02, respectively). Temporary postoperative reduction of natural killer cell activity was also observed in both groups, but the natural killer cell activity on postoperative day 1 in the cimetidine group (17.1%) was significantly higher (p = 0.02) than that in the control group (8.20%). CONCLUSIONS: Cimetidine counteracts depressive effects of cardiopulmonary bypass on cell-mediated immunity and may possibly reduce postoperative susceptibility to infection.

Antigens, CD↗
PubMed1997

Isolation and structural characterization of pituitary adenylate cyclase activating polypeptide (PACAP)-like peptide from the brain of a teleost, stargazer, Uranoscopus japonicus.

Pituitary adenylate cyclase-activating polypeptide (PACAP) is a novel neuropeptide consisting of 38-residue (PACAP 1-38) and a truncated form with 27 residues (PACAP 1-27) that plays several roles in tetrapods. We isolated a highly purified PACAP-like peptide from the brain of a teleost, the stargazer, by extracting of acetone-dried powder with acetic acid followed by high-performance liquid chromatography (HPLC) on gel-filtration, cation-exchange, and reverse-phase columns. Purification was monitored by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting analysis using an anti-PACAP 1-27 antiserum. The PACAP-like peptide thus obtained had a molecular mass of 4,623, determined by mass spectrometry, and its amino acid sequence showed 89 and 87% identity with those of ovine and frog PACAPs, respectively. These results indicate that a PACAP-like peptide, which is a highly homologous with tetrapod PACAP, is present in the teleost brain.

Amino Acid Sequence↗
PubMed1997

[A case of primary HIV-1 infection].

A previously healthy 28 year old Japanese man came to us with a genital ulcer which appeared 13 days before admission to our hospital. He had subsequently fever (40 degrees C), arthralgia, a sore throat and oral aphtha 6 days before admission. He had a history of sexual contact with a female commercial sex worker one week before his illness. On the day of admission, he had shallow ulcers on the lip, tongue and penis. Initial laboratory test included leukopenia and thrombocytopenia. His fever abated 3 days after admission. His condition and bicytopenia recovered completely after 12 days of admission. Although, his serum HIV-1 antibody was negative when he was admitted, 3 months later the antibody was seroconverted. And p24 antigen and HIV-1 RNA of stocked serum were positive. Diagnosis of primary HIV-1 infection was made. Recently, HIV-1 infection has been increasing in Japan. Consideration of this disease in differential diagnosis of acute febrile illness is necessary.

Adult↗
PubMed1996

[A case of rapidly grown pulmonary blastoma].

A 78-year-old woman who had been in a local hospital with a complaint of cough and chest pain was referred to our hospital because a mass 12 cm in size was found in her right lung by a chest X-ray and CT. Within 3 weeks, the tumor rapidly developed to 19 cm in size. Malignant schwannoma of the lung was suspected by a percutaneus lung biopsy and the right upper and middle lobectomy was performed. Histological analysis of the tumor showed a biphasic structure with epithelial and mesenchymal component which was diagnosed pulmonary blastoma. Pulmonary blastoma is very rare, but it may be of benefit for the thoracic surgeon to establish methods of diagnosis and treatment of this disease.

Aged↗
PubMed1995

A convulsant, 3-mercaptopropionic acid, decreases the level of GABA and GAD in rat pancreatic islets and brain.

To investigate the properties of the gamma-aminobutyric acid (GABA) synthesizing enzyme, glutamate decarboxylase (GAD), in the brain and the pancreatic islets of the rat, GABA concentration in the brain and the pancreatic islets was measured after intraperitoneal administration of 3-mercaptopropionic acid (3-MP) at 25 mg/kg. 60 min after the administration of 3-MP, GABA concentration in the hypothalamus, the superior colliculus and the hippocampus of the brain decreased by 20-30% and in the pancreatic islets by 35%. The concentration in the pancreatic acini did not change. Western blotting showed that GAD activity in the pancreatic islets decreased after administration of 3-MP compared to the control. The activity of GAD in the pancreatic islets as well as brain can be modified by a convulsant, in this case 3-MP. These results suggest the properties of GAD may be similar in the pancreatic islets and brain.

3-Mercaptopropionic Acid↗
PubMed1995

Rupture of an isolated internal iliac artery aneurysm into the rectum: report of a case.

Aneurysmal rupture into the intestinal tract is a rare but disastrous complication of an internal iliac artery aneurysm. We report herein the successful surgical repair of a fistula between a huge aneurysm of the right internal iliac artery and the rectum in an 81-year-old man. After a femoro-femoral cross-over bypass had been performed, the aneurysm was opened and its patent arterial branches were ligated with sutures. The fistula was then intra-aneurysmally sutured and covered with an omental flap. The diagnostic and therapeutic approaches to this severe complication are discussed with a review of the literature following the presentation of this case.

Aged↗
PubMed1995

Response of glutamic acid decarboxylase to glucose but not arginine in islets.

This study examined responses of glutamic acid decarboxylase (GAD65) and gamma-aminobutyric acid (GABA) to glucose in pancreatic islets. Islets isolated from Wistar rats were cultured for the three days under different concentrations of glucose (5.6, 11.1 or 16.7 mM) or arginine (2 x 10(-1)-2 x 10(-4) mM) for different periods of time. The expression of GAD65 increased 3.8- and 4.5-fold with the elevation of glucose concentrations as well as the prolongation of culture periods of time, while it did not increase with arginine. GABA content of islets did not change in a range of 5.6 to 16.7 mM glucose. These results suggest that normalization of hyperglycemia would reduce the expression of the autoantigen in islets, which might prevent islets from further destruction. To the contrary, the persistent hyperglycemia could interfere with insulin synthesis not by change of GABA in islets but by the destruction of islets through GAD65 expression.

Animals↗