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Biomedical subjects

H Hashimoto

Publications and source records attributed to H Hashimoto.

At least 595 records · Page 33Linked to original sources
PubMed1995

Eighth cranial nerve lipoma manifesting as intractable vertigo--Case report.

A 49-year-old female presented with an extremely rare lipoma of the cerebellopontine angle (CPA) manifesting as intractable vertigo and tinnitus. Subtotal removal of the lipoma was performed to debulk the tumor and decompress the cranial nerve VIII. Her complaints were resolved without new neurological deficit. We recommended surgery in patients with symptomatic CPA lipomas for diagnosis, debulking, and decompression of cranial nerves to relieve the symptoms.

Cerebellopontine Angle↗
PubMed1995

Detection of antibodies to HIV-1 gp41- and HLA class II antigen-derived peptides in SLE patients.

A role for viruses in the pathogenesis of human autoimmune diseases has long been suspected but has not yet been proven. Highly conserved homologous regions has been reported in the carboxy terminus of human immunodeficiency virus (HIV)-1 gp41 (amino acids 838-844) and the amino-terminal of the beta chain of all human HLA class II antigens (amino acids 19-25). This molecular mimicry between HIV-1 and HLA class II antigens may lead to the generation of autoantibodies and may contribute to the development of autoimmune phenomena in HIV infected patients. We detected antibodies for these homologous peptides from HLA class II and HIV-1 gp41 in systemic lupus erythematosus (SLE) patients without HIV-1 infection. Thirty-seven percent of the SLE patients had IgM antibodies reacting with both HLA class II- and HIV-1 gp41-derived peptides. These results suggest the possibility that a retrovirus may be one of the causative agents of SLE.

Adult↗
PubMed1995

[A report of leiomyosarcoma of the esophagus].

Leiomyosarcoma of the esophagus is an uncommon disease of which only 97 cases including the present case have been reported in Japan. We report a case of the tumor which showed multiple hematogenous metastases after surgery. A 73-year-old male was admitted complaining of dysphagia and vomiting. Esophagography and endoscopy revealed a large protruding lesion in the lower esophagus. CT scanning revealed threefold-sized extramural mass. Boring biopsies failed to yield evidence of malignancy. However, we performed surgical treatment because of the uncommon size for a benign tumor. The excised tumor was 11 x 9 x 5 cm in size and was diagnosed histologically as leiomyosarcoma of the esophagus without any nodular involvement. Metastatic tumor in the right rib was found 14 months after the operation. Radiotherapy failed to decrease tumor size but eliminated pain. Bone metastases appeared successively and the patient died 3 years and 4 months after operation. Chemotherapy had no effect. Autopsy revealed metastases to the ribs, vertebrae, sternum, pelvic kidneys and diaphragm, but no local recurrence. There is a great need for the development of effective anti-cancer drugs for leiomyosarcomas, particularly in cases with extensive metastasis, such as presented here.

Adult↗
PubMed1995

[Gastric cancer in the elderly].

Gastric cancer in the elderly was evaluated with regard to age-related pathomorphological changes. Resected gastric cancer was studied with regard to location, stage, morphology and histology in male young old (65-74 years old) which were 25 cases and 31 lesions, respectively male middle old (75-84 years old); 104 cases and 120 lesions, male very old (85 years-); 96 cases and 110 lesions, female young old; 22 cases and 31 lesions, female middle old; 91 cases and 106 lesions, female very old; 51 cases and 55 lesions. Multiple gastric cancers were more frequent in female older group. In early cancer the frequency of elevated type increased significantly and that of depressed type decreased in very old group. In advanced cancer Borrmann I type was not so common in very old group. Histologically the frequency of signet ring cell cancer decreased and of tubular adenocarcinoma and of papillary adenocarcinoma increased significantly in female very old group. Hepatic metastasis increased significantly in male very old group. Lymph node metastasis and peritoneal metastasis did not show any change in age-related frequency.

Age Factors↗
PubMed1995

[Risk factors of operative death and prognosis following operations for esophageal cancer in the elderly].

Risk factors of operative death and prognosis in the elderly following operations for esophageal cancer were evaluated by multivariate analyses. Data were obtained from 45 operations over a 14-year period in patients of a mean age of 72.6 +/- 6.3 years. Using a multiple logistic model analysis, it was determined that the significant risk factor of death within 50 postoperative days was postoperative pulmonary complication. No other factors were significant as risk factors with regard to survival. Cox's proportional hazards model analysis was used to assess the prognostic factors of long-term survival following operations. Independent predictors were the stage of cancer and age. We conclude that two points are essential to improve the survival rate of elderly patients with esophageal cancer; first, postoperative special attention in order to prevent pulmonary complications and secondly, performing operations at as early a stage of cancer as possible.

Aged↗
PubMed1995

Age- and sex-related alterations of microsomal drug- and testosterone-oxidizing cytochrome P450 in Sprague-Dawley strain-derived dwarf rats.

Effect of growth hormone (GH) on the age-related changes in hepatic cytochrome P450 (P450) was studied using GH-deficient dwarf and parental Sprague-Dawley rats. Microsomal testosterone (T) T2 alpha- and T2 beta-hydroxylations were lower in livers of mature male dwarf rats than the normals, whereas T16 beta-hydroxylation was rather higher in male dwarf rats. Although T2 alpha-, T2 beta-, T6 beta-, T16 alpha- and T16 beta-hydroxylations were barely detectable in senescence normal rats (24 months old), considerable levels of T6 beta-, T16 alpha- and T16 beta-hydroxylations were maintained in senescence dwarf rats (after 22 months old). These results are caused by the alteration of specific P450 forms including CYP2B1, CYP2B2, CYP2C11 and CYP3A2 in dwarf rats. Appearance of male-specific CYP2C11 and CYP3A2 and high levels of CYP2B1 and CYP2B2 in female dwarf rats indicate the role of pituitary GH on liver of normal rats. However, the additional role of a factor other than GH was suggested on the sex-related differences and age-associated alterations of specific P450 contents in dwarf rats. CYP2C11 appears in dwarf female rats with the same developmental profile as observed in normal male rats. This form appears apparently with the development of GH receptor in livers, suggesting the possibility that a factor independent from androgen and GH governs the ontogeny of this P450 in the liver. A female-specific protein, CYP2C12, in normal rat livers, also appeared in both sexes of senescence dwarf rats, suggesting the role of non-GH factor on the expression of this P450 in liver.

Age Factors↗
PubMed1995

[Does aging influence effect of pirenzepine alone or combination of pirenzepine and famotidine on gastric secretion during anesthesia and surgery?].

Effect of pirenzepine alone or the combination of pirenzepine and famotidine on gastric secretion during anesthesia and surgery was evaluated in 52 elective surgical patients ranged in age from 17 to 68 years. These patients of each group were divided into two subgroups according to their age either 40 years and under or over. The patients underwent orthopedic, ophthalmic, ENT, plastic or non-abdominal general surgery under neuroleptanesthesia except 5 patients who had enflurane or isoflurane anesthesia. They received either pirenzepine 10 mg or the combination of pirenzepine 10 mg and famotidine 20 mg intravenously just before the induction of anesthesia. Volume and acidity of gastric juice were measured for 3 hours after the administration of these agents. Decrease in volume and acidity of gastric juice continued for more than 3 hours after the administration of pirenzepine alone or the combination of pirenzepine and famotidine, and it was more prominent in the combination group than in the pirenzepine group. There was no statistical difference in volume of gastric juice between the patients of 40 years and under in age and those over 40 years in each group. However, the intragastric pH tended to be lower in patients of 40 years and under in age than that in those over 40 years. A percentage of patients who had intragastric pH below 2.5 was larger in the pirenzepine administered patients of 40 years and under in age than that of the remaining patients.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1995

Differences in haemagglutination activity and electrophoretic mobility of E protein between the parent SA14 and attenuated vaccine SA14-14-2 strains of Japanese encephalitis virus.

E protein characteristics of the attenuated Japanese encephalitis (JE) virus strain SA(A) derived from the live vaccine strain SA14-14-2 were compared with those of the virulent strain SA(V). SA(A) showed lower haemagglutination (HA) activity with broader optimum pH range of HA reaction than SA(V), and the E protein of SA(A) had slower electrophoretic mobility in sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) than that of SA(V). These properties of SA(A) E protein appear to be caused by eight amino acid changes found in the E protein coding region of the SA(A) virus genome.

Amino Acids↗
PubMed1995

[Medical education in clinical anesthesia].

We use an angiofiberscope (AFS), an echocardiography (ECG) and a transesophageal echocardiography (TEE) as useful and productive tools for medical education perioperatively. We employed these monitors in the training of 5th-year medical students on general anesthesia in the operating room. A special intratracheal tube with small lumen (3 mm in diameter) for AFS (2.2 mm in diameter), was used for monitoring airway. Medical students are interested in and concentrate their attention on the monitor screen which has a continuous image from AFS. ECG was used routinely to evaluate preoperative cardiac function, while TEE was used during operation. These monitors play very useful role in medical education for students.

Anesthesiology↗
PubMed1995

[Successful combination therapy of cyclosporine and steroids in two cases with interstitial pneumonitis associated with polymyositis].

Cyclosporine is an immunosuppressive agent which is well-established in the transplantation of organs including kidney, liver and bone marrow. It acts by inhibiting the production of interleukin 2, thereby blocking both the development of cytotoxic lymphocytes, and the proliferation of helper T cells. T cell-mediated muscle damage is thought to be important in the pathogenesis of polymyositis. And activated cytotoxic T cells are thought to play an important role of polymyositis/dermatomyositis with active pneumonitis. It is thereby likely that cyclosporine would be effective in the management of polymyositis with interstitial pneumonitis. We have used cyclosporine in two cases of corticosteroids resistant polymyositis associated with pneumonitis. The first case was admitted because of the relapse of polymyositis. She was partially responded by the high dose of steroid, but showed decreased %DLCO and increased AaDO2 during the therapy. And oral cyclosporine was given with steroid. Within two weeks, serum creatinine kinase level was reduced to normal range, and the improvement of pneumonitis was observed. The second case was admitted because of the flare of pneumonitis. She was treated with high dose of steroid with insufficient response. And cyclosporine was prescribed. Within two weeks of treatment, her symptom was relieved, and blood gas analysis showed an improvement of pulmonary function. And steroid could be tapered. In both cases, the initial dose of cyclosporine was 200 mg/day, and the optimal trough level was thought to be ranged 100 to 150 ng/ml. In the second case, renal dysfunction was observed but it was recovered by the reduction of the dose of cyclosporine. No other side effect was appeared.(ABSTRACT TRUNCATED AT 250 WORDS)

Cyclosporins↗
PubMed1995

Alterations in bile ducts and peribiliary microcirculation in rats after common bile duct ligation.

The chronological changes in ductular epithelium and peribiliary capillary plexuses (PBPs) after bile duct ligation are not well understood. Therefore, we examined alterations in both intrahepatic bile ductules and peribiliary microcirculation in rats after ligation of the common bile duct using immunohistochemistry, transmission electron microscopes (TEM), and scanning electron microscopes (SEM). Ductular proliferations appeared first in the peripheral areas of the portal spaces and then gradually advanced along with increasing jaundice. Distorted configuration of the hepatic parenchyma with interconnecting stroma rich in irregular ductules developed 4 weeks after the ligation. Numerous biliary cell types and cells of types intermediate between hepatocytes and biliary cells together with poorly fenestrated capillary-type vessels appeared in the periportal parenchyma, in association with an increased number of canalicular-ductular junctions on TEM. These biliary cells were often found within the lobules and apart from the stroma. SEM examination of hepatic microvascular casts using methacrylated resin showed formation of irregular portal and periportal capillary networks, partly derived from coarsened sinusoids. Direct connections between the newly formed capillary networks and the pre-existing PBPs or sinusoids were numerous, although there were few direct connections between the capillary networks and the hepatic arterial branches. Thus, these proliferated ductules and newly formed complicated capillary networks might play an important role in the effective transport of biliary materials between hepatocytes and native bile ducts or proliferated ductules through the altered microcirculation after bile duct ligation.

Animals↗
PubMed1995

[Endocrine effects of nicardipine on intraoperative hypertension under droperidol-fentanyl-ketamine (DFK) anesthesia].

Effects of nicardipine on endocrine functions were evaluated in 10 surgical patients who received surgeries under total intravenous anesthesia with droperidol, fentanyl and ketamine (DFK). Plasma levels of norepinephrine (NE), epinephrine (E), plasma renin activity (PRA), aldosterone and atrial natriuretic peptide (hANP) were measured following nicardipine injection during 30 minutes of intraoperative hypertension. When the systemic blood pressure exceeded 160 mmHg systolic and 95 mmHg diastolic for five minutes, 0.5 mg approximately 10 mg of nicardipine was administered for 30 minutes to maintain the systolic blood pressure below 160 mmHg. Following the injection of nicardipine a significant reduction by 20% in the mean systolic and diastolic pressure was observed. Mean heart rate increased by 5%, but the increase was not significant. Plasma NE increased significantly 1.7 time from the control level at 15 minute following the injection. Plasma levels of E, PRA, aldosterone and hANP showed no significant changes.

Adult↗
PubMed1995

[Experimental study on hypertensive crises in epileptic seizures--changes in pial artery diameter, intracranial pressure and regional cerebral blood flow].

It is well known that severe hypertension occurs during epileptic seizures, but little information is available concerning these hypertensive crises. We therefore investigated them by monitoring regional cerebral blood flow (rCBF), intracranial pressure (ICP) and pial artery diameter (PAD) in paralyzed mechanically-ventilated cats with penicillin-induced seizures. The animals were assigned to two groups. In one (Group H), they were maintained in an untreated state. In the other (Group C), spinal cord injury was performed in advance to prevent the rise in arterial blood pressure during the seizures. In both groups, the values of the various parameters increased during seizure activity, but the increases in group H, were greater than in group C. In both groups, PAD, rCBF and ICP increased immediately at the onset of the seizures with no hypertension. In group H, further increases in PAD, rCBF, and ICP were found concurrent with the elevation of arterial blood pressure in the latter half of the seizure, while in group C, rCBF decreased concurrent with the increase in ICP in the latter half of the seizure, although PAD was found to be maximal. These findings suggest that hypertensive crises during epileptic seizures represent a protective mechanism to maintain perfusion pressure.

Animals↗
PubMed1995

Immune response in mice infected with the attenuated Japanese encephalitis vaccine strain SA14-14-2.

We characterized protective immune response in mice infected with the attenuated Japanese encephalitis virus (JEV) strain SA(A) derived from the live JE vaccine strain SA14-14-2. In the sera of mice infected with SA(A), antibodies to JEV envelope (E) and non-structural NS1 proteins were detected by Western blot analysis and neutralization, haemagglutination-inhibition (HAI), and complement fixation (CF) antibodies were detected by serological tests. Production of antibody to NS1 protein strongly indicated peripheral growth of SA(A) in mice and its growth induced the immune response. A single immunization with SA(A) significantly protected mice against lethal intracerebral (ic) challenge with the virulent SA(V) strain.

Animals↗
PubMed1995

[The relationship between infiltrating grade and prognosis by the preoperative diagnosis in ultrasonogram in breast carcinoma].

To evaluate peripheral infiltrative growth (inf) of breast catrcinomas as a prognostic factor, overall survival probabilities in 169 patients with tumor less than 5 cm in diameter were analysed in relation to the degree of inf (alpha, beta, gamma) using Kaplan-Meier method. There were statistically significant correlations between inf alpha and beta, inf alpha and gamma. On the other hand, the boundary echo (BE) observed at the peripheral margin of tumor in ultrasonogram is considered to reflect inf patterns of breast carcinomas. Therefore, BE was classified into three types as follows. Type I; negligible or regular thin marginal hyperecho. Type II; irregular thick marginal hyperecho. Type III; radiating boundary echo. These three types were matched to the patterns of infiltration so as to find any correlation between ultrasonogram and a corresponding histrogical specimen. Three types of ultrasonographic infiltrative grades (U-INF alpha, beta, gamma) were defined as follows. U-INF alpha; Type I BE is observed almost all surface of tumor. U-INF beta; Type II or III BE is observed in less than 50% of tumor surface. U-INF gamma; Type II or III BE is observed in over 50% of tumor surface. Total of 108 cases with tumor less than 3cm in diameter were received preoperative ultrasonographic studies. U-INF had highly significant correlation with inf and the occurrence of lymph node metastasis.

Adult↗
PubMed1995

Systemic and cerebral vasculitis coexisting with disseminated coagulopathy in systemic lupus erythematosus associated with antiphospholipid syndrome.

Systemic lupus erythematosus (SLE) and antiphospholipid syndrome (APS) are closely related, but each has it own characteristic vasculopathy: vasculitis in SLE and thrombosis in APS, and either may be a serious or life threatening complication. When a patient has SLE associated with APS, systemic and cerebral vasculitis may coexist with disseminated coagulopathy. We report this complication in a 60-year-old woman who died from stroke and myocardial infarction, an occurrence seldom documented in the literature.

Antiphospholipid Syndrome↗
PubMed1995

Effects of bifemelane hydrochloride on plasma neuropeptide Y, 3-methoxy-4-hydroxyphenylethylene glycol and 5-hydroxy-indole acetic acid concentrations in patients with cerebral infarction.

Bifemelane hydrochloride (BH) is widely employed in Japan in the treatment of cerebral infarction patients with depressive symptoms and its antidepressant action is considered to be caused by the normalizing effects of neurotransmitters. The relationship between the normalizing effects of neurotransmitters of BH and the depressive state of patients with cerebral infarction was examined. BH 150 mg/day was administered for three months to 13 cerebral infarction patients with depressive state. We measured the plasma neuropeptide Y (NPY), 3-methoxy-4-hydroxyphenylethylene glycol (MHPG) and 5-hydroxy-indole acetic acid (5-HIAA), and assessed the depressive symptoms using the 21-item Hamilton's Rating Scale for Depression (HRSD) before and after administration of BH. After treatment, the plasma NPY concentration was significantly increased, the plasma MHPG concentration and total score of HRSD were significantly decreased, and the plasma 5-HIAA concentration showed no changes. These findings suggest that the antidepressant effect of BH is caused by the normalizing effects of NPY and noradrenalinergic neurons.

Aged↗