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Biomedical subjects

T Morimoto

Publications and source records attributed to T Morimoto.

At least 613 records · Page 34Linked to original sources
PubMed1988

[Usefulness of radial artery graft bypass: two cases of internal carotid artery aneurysms].

Trapping and EC-IC bypass surgery was performed for two cases of internal carotid aneurysm using the radial artery as bypass material. Neither case has any permanent neurological deficit because of an adequate blood supply via the radial artery graft bypass. Although the radial artery graft has been in common use among cardiac surgeons, it is still rare in the neurosurgical field. The advantage of the radial artery is discussed with comparison to other graft materials such as saphenous vein and superficial temporal artery. In properly selected cases, the radial artery graft is efficient in preventing the ischemic damage caused by trapping of aneurysm at the main arterial trunk.

Anastomosis, Surgical↗
PubMed1988

Evaluation of cytoprotective drugs for liver preservation by pyridine nucleotide fluorometry.

The cytoprotective effects of membrane-stabilizing drugs, such as chlorpromazine, allopurinol, dibucaine, phenoxybenzamine, and OP41483 (prostacyclin analogue), administered to perfusate and preservation medium were studied in rat liver, after 24 hours' preservation, by assessment of pyridine nucleotide fluorescence. On the fluorometric trace curve, amplitude (RxA) and velocity (RxV) from oxidation to reduction were determined. Percent decrease of RxA (%RxA) and that of RxV (%RxV) after 24 hours' preservation were calculated. At the end of preservation, the concentration of total adenine nucleotides of the liver, hepatic adenylate energy charge, and prepared mitochondrial oxidative phosphorylative activity were also measured. In the groups given phenoxybenzamine, dibucaine, and allopurinol, there was no significant difference among these parameters. In the chlorpromazine group, energy charge and %RxV were higher than in the drug-free group (p less than 0.05). In the OP41483 group, both energy charge and phosphorylation rate were significantly higher (p less than 0.05) and %RxV was significantly high (p less than 0.01) at concentrations of more than 3 nmol/L, compared with the values for those without drugs. These results suggest that the Redoximeter can provide accurate information on the effectiveness of cytoprotective drugs. It is also suggested that OP41483 has potential application for maintaining graft viability for human liver transplantation.

Allopurinol↗
PubMed1988

[Effect of intra-arterial infusion of adriamycin on locally advanced primary breast cancer--third report. Clinical Study Group of Adriamycin for Breast Cancer in Japan].

The purpose of this study was to define the optimal dose and schedules for intra-arterial administration of adriamycin (ADR) in the treatment of locally advanced breast cancer. ADR was given intra-arterially to 110 patients with locally advanced breast cancer at a dose of 30 mg/time or 50 mg/time twice or once a week, respectively, with a total dose of 150 mg. The local effects and side effects of ADR as well as the prognosis were analysed in 91 evaluable cases. Overall response rates for ADR were as high as 62.2% (63/91) in the primary lesions and 80.0% (40/50) in metastatic lymph nodes. There was no difference in the response rate between cases receiving 30 mg and those receiving 50 mg at each infusion. However, a significantly higher response rate was noted, in patients infused ADR through both the subclavian and internal thoracic arteries (dual route group) in comparison with those infused through the subclavian artery alone (single route group). Histological effects of ADR on the primary lesion were assessed in accordance with the criteria proposed by Shimosato et al. Overall histological response rate (greater than Grade II b) was obtained in 29.4% (16/51), which was lower than the clinical effects. Histological effects were more potent in the 30 mg group than in the 50 mg group, but in relation to the route of administration, there was no significant difference between the groups. As for side effects, signs of systemic toxicity such as alopecia, leukopenia and gastrointestinal disorders were frequently observed, but there was no difference between the dose groups, and these side effects were considered to be tolerable. Prognostically, 50% survival time was 32.6 months, and the patients who received dual-route administration showed better survival.

Breast Neoplasms↗
PubMed1988

[Breast cancer detected by mass screening using physical examination alone].

In Tokushima prefecture, mass screening for breast cancer has been conducted using physical examination alone since 1970. Breast cancer was detected in 108 of 141,116 screened women up until 1986. The detection rate was 0.08% among total examinees, 0.12% among initial examinees, and 0.04% among subsequent examinees. Patients with breast cancer were divided into three groups. Group I consisted of 70 patients whose cancers were detected by initial screening examination. Group II consisted of 38 patients whose cancers were discovered by subsequent periodic screenings. Group III included "interval" patients, whose cancers were found in the interval within 2 years between a negative screening examination and the next screening; 19 patients were classified into this group. Serving as controls were 615 breast cancer patients who visited our outpatient clinic, independently of the screening program, during the same period as that of the mass screening. Of the 108 patients in Groups I and II, 51 patients (47%) had noticed a lump in the breast themselves by the time of the mass screening. The stage classification and nodal involvement showed significant differences between the mass screening group and the control group, but no significant differences among the three groups. The Group III cases (interval cases) were detected at an early stage, but some of these cases included patients with fast-growing tumors. When compared with cumulative survival curves according to age-matched case-control study, there was no significant difference between the patients whose tumors were detected in the mass screening and the controls.

Ambulatory Care↗
PubMed1988

[A case of advanced breast cancer successfully treated with combined tamoxifen and epitiostanol].

A patient with stage IV advanced breast cancer with multiple metastasis (bones of the whole body, lungs) were treated by ovariectomy, administration of an non-steroidal antiestrogen (tamoxifen) and mild chemotherapeutic drugs, with favorable results. After four years, however, the patient had a relapse of the cancer. A steroidal antiestrogen (epitiostanol) was then administered with satisfactory results. When a breast cancer relapse occurs in patients once treated successfully with endocrinotherapy, a different form of endocrinotherapy should be tried. There is a possibility that the mechanism of action of Epitiostanol, which is regarded as a steroidal antiestrogen, is different from that of tamoxifen in which an estrogen receptor (ER) system is included.

Androstanols↗
PubMed1987

Kinetic alterations of cytochrome c oxidase in carbon tetrachloride induced cirrhotic rat liver.

In a study of the chronic effects of CCl4 on the respiratory activities of rat liver mitochondria, the content of cytochrome c oxidase increased from 0.077 +/- 0.010 (nmol/mg protein) for normal rats to 0.101 +/- 0.009, and its specific activity increased from Vmax = 345 +/- 24 (e-/s/cytochrome aa3) to 431 +/- 19 in mitochondria of CCl4 treated rats. There was a slight increase in Km for cytochrome c from 5.63 +/- 0.08 microM to 7.79 +/- 0.80. These results would strongly suggest that an appreciable decrease in the steady state concentration of ATP in hepatic cells of CCl4 treated rats brought about a compensatory increase in the overall activity of cytochrome c oxidase. However, when the rate of oxygen uptake by mitochondria was measured in the presence of rotenone and tetramethyl-p-phenylene-diamine with NADH as substrate, the specific activity in CCl4 treated rats was lower than that of normal rats (Vmax = 345 +/- 31 (e-/s/cytochrome aa3), as compared to Vmax = 408 +/- 21) in spite of the increased activity of cytochrome c oxidase. This phenomenon was ascribed to a decrease in the activity of NADH cytochrome b5 reductase in the mitochondrial outer membrane due to CCl4 treatment.

Adenosine Triphosphate↗
PubMed1987

Use of a DNA probe to measure the neutralization of Plasmodium berghei sporozoites by a monoclonal antibody.

A specific DNA probe has been used to quantify the neutralizing effects of monoclonal antibodies (3D11) against the circumsporozoite protein of Plasmodium berghei sporozoites. The amount of parasite DNA was measured in the livers of Norway Brown rats at the peak of proliferation of the exoerythrocytic forms (EEF). In vitro treatment of 1.5 X 10(5) sporozoites with 0.36 microgram/0.5 ml of whole 3D11 IgG neutralized about 90% of the sporozoite infectivity. When the dose was 3.6 micrograms no signal was detected, indicating that less than ten sporozoites developed into EEF in the liver. In contrast, 3.6 micrograms of Fab obtained from 3D11 neutralized sporozoite infectivity by only 60%. Although the neutralizing effect of 3D11 was very marked, the infected rats developed parasitemias after a prolonged delay in patency, suggesting that a small proportion of sporozoites was resistant to the effects of 3D11. The sporozoites were subjected to four cycles of 3D11-mediated selection, each one involving treatment of sporozoites with the antibodies, injection of the mixture into rats, infection of hamsters with blood stage parasites obtained from the rats, feeding of Anopheles stephensi on these hamsters, and obtaining sporozoites from the salivary glands of the infected mosquitoes. After four cycles of selection, the susceptibility of the resulting sporozoites to different concentrations of 3D11 was compared with that of nonselected sporozoites. No differences were detected, indicating that the capacity of a few sporozoites to escape the neutralizing effect of 3D11 antibodies is not inherited.

Animals↗
PubMed1987

Breast cancer detected by mass screening using physical examination alone.

In Tokushima prefecture, mass screening for breast cancer has been conducted using physical examination alone since 1970. Breast cancer was detected in 116 of 111,571 screened women up until 1984. The detection rate was 0.08 per cent in total examinees, 0.13 per cent in initial examinees, and 0.04 per cent in subsequent examinees. The patients with breast cancer were divided into three groups, i.e., 62 cases detected at initial screening, 28 cases detected at subsequent screenings, and 26 interval cancer cases. 510 patients with breast cancer in the outpatient clinic were serving as controls. The stage classification and nodal involvement were significantly different between the mass screening group and the control group, but not significantly different among the three groups. The interval cases were detected at an early stage. The survival rates were not significantly different between the three groups and the control group. Efforts should be doubled to educate women about the proper method of breast self-examination in order to promote the early detection of breast cancer.

Adult↗
PubMed1987

Change in salt appetite due to rehydration level in rats.

Thermally dehydrated rats were given a choice of tap water and saline (0.9% or 1.8% NaCl), and the change in the salinity of their choice during rehydration was measured up to 15 hr. The rats consumed more water than saline for about 2 hr after the start of fluid replacement (about 55 mEq/l), while they consumed more saline than tap water (about 120 mEq/l) thereafter. Urine output and urinary Na output were only about 20% of their intake during the initial 4 hr of rehydration, while after 4 hr the output became almost equal with the intake. The change in salt intake occurred when about 90% of Na loss and 60% of fluid loss was regained. The results indicate that rats choose dilute salt solution to lower plasma osmolality during the initial period of the rehydration and then regain body fluid isotonically. Urine volume and urinary Na output increased only after volume repletion. Thus, osmoregulation with salt appetite has priority over fluid volume regulation in restitution from thermal dehydration.

Animals↗
PubMed1987

Microsurgical treatment of patients with vestibular and cochlear symptoms.

Eighteen patients with vertigo, tinnitus, and various hearing disturbances were treated by posterior fossa exploration and microvascular decompression of the eighth cranial nerve; they were followed for more than 3 years. After successful decompression of the eighth nerve from offending vessels, the attacks of vertigo disappeared in 11 patients, improved markedly in 3 patients, and improved mildly in 4 patients. The tinnitus vanished in three patients and decreased in nine. The hearing disturbance improved in only five patients and worsened in three. Because of the satisfactory improvement of the attacks of vertigo, which are the most distressing symptoms for patients, we recommend surgical exploration for patients with severe symptoms of vestibular disturbances.

Aged↗
PubMed1987

The influence of hemodilution in normal and cirrhotic rats in relation to hepatic energy metabolism.

The effects of acute hemodilution on hepatic energy status were compared between carbon-tetrachloride-induced cirrhotic rats and normal rats, using arterial blood ketone body ratio and hepatic energy charge as indices. Arterial blood was withdrawn and replaced with rat plasma in hemodiluted rats and with whole blood in sham-diluted control rats. In normal rats, arterial blood ketone body ratio and energy charge level at 6 hours after hemodilution decreased when the hematocrit value was less than 15%. In contrast, the values decreased at an even higher hematocrit level in cirrhotic rats. It was suggested from these results that the hemodilution procedure exerts a more profound hypoxic effect at a milder hemodilution on a cirrhotic liver than on a normal liver.

Adenine Nucleotides↗
PubMed1987

Short-term changes in blood ketone body ratio in the phase immediately after liver transplantation.

Arterial blood ketone body ratio was measured after orthotopic liver transplantation in piglets. Ketone body ratio immediately decreased at the beginning of the anhepatic phase and was rapidly restored to the normal levels within 30 min after the revascularization of the allograft. Serum lactate and pyruvate levels increased in anhepatic phase and gradually decreased after revascularization. Changes in the lactate and pyruvate levels were always preceded by changes in ketone body ratio. In the case of transplantation after 12-hr-preservation of the allograft, ketone body ratio failed to maintain normal levels after transplantation, resulting in a high mortality. It is suggested that the elevation of decreased ketone body ratio is prerequisite for the normalization of the deranged metabolic state after liver transplantation, and that ketone body ratio provides an accurate means to assess the initial metabolic function of the allograft.

Animals↗
PubMed1987

Fluorometric study for the noninvasive determination of cellular viability in perfused rat liver.

Pyridine nucleotide fluorescence in perfused rat liver for the noninvasive determination of donor graft viability was investigated in relation to other metabolic indices, such as NAD concentration, adenine nucleotides, and mitochondrial phosphorylative activity. The amplitude between oxidation and reduction levels (RxA) in fluorometric trace, and the slope or the velocity of the trace curve from oxidation to reduction (RxV) were determined by the measurement of fluorescence from NAD(P)H, using a new fluorometric device, RxA and RxV decreased proportionally to the duration of preservation period (6, 12, 24, 48 hr) in simple cold storage. Other values of hepatic cell viability, such as total adenine nucleotides, energy charge, and mitochondrial phosphorylation rate, were simultaneously measured and also decreased proportionally to the duration of preservation period. There were close positive correlations between the percentage of RxA and NAD concentration (r = 0.724, p less than 0.01), between the percentage of RxA and total adenine nucleotides (r = 0.887, p less than 0.01), between the percentage of RxV and energy charge (r = 0.715, p less than 0.01), and between the percentage of RxV and phosphorylation rate/cytochrome a(+a3) (r = 0.837, p less than 0.01). These results suggest that this fluorometric method can provide an accurate noninvasive evaluation of donor graft viability--and, unlike the present indices of energy metabolism, it may be applied to evaluate the primary nonfunctioning graft prior to transplantation.

Adenine Nucleotides↗
PubMed1987

Changes in blood volume and plasma sodium concentration after water intake in rats.

Changes in blood volume (BV) and Na+ concentration of plasma ([Na+]) were measured continuously during recovery from thermal dehydration in rats. At least 5 days prior to the experiments rats were cannulated into both the jugular vein and the descending aorta. After thermal dehydration (DBT: 36 degrees C, RH: 20%) amounting to approximately 6% of body wt, catheters were connected to a system for continuous monitoring of BV and [Na+]. Water was made available and water intake, BV, and [Na+] were recorded at 30-s intervals for 4 h. The rats took 2-3 ml of water/100 g of body wt in the first 10 min and then drank 1 ml at 30- to 60-min intervals to reach equilibrium in 2-3 h. The relations between water intake and delta BV and between delta[Na+] were analyzed for 2 h after the start of water supply. BV was unchanged until 18.9 +/- 3.6 min after access to water, whereas [Na+] started to decrease after 3.6 +/- 0.6 min. The retention ratio of ingested fluid in the vascular space was 20.8 +/- 2.8%, and the decrease of [Na+] was 1.5 +/- 0.2 meq X l-1 X ml ingested fluid-1 X 100 g body wt-1. These results indicate that drinking causes the change of [Na+] more rapidly than that of blood volume.

Animals↗
PubMed1987

Influence of hemodilution on hepatic energy metabolism in rat.

The effects and safety limits of acute hemodilution on hepatic energy status were investigated in relation to arterial blood ketone body ratio and hepatic energy charge in a hemodilution rat model. As long as the hematocrit value was maintained above 20%, ketone body ratio and energy charge level at 6 h after hemodilution remained at the same levels as those of the sham-diluted groups. However, when hematocrit value was less than 15%, the ketone body ratio markedly decreased from the control value of 0.686 +/- 0.044 to 0.278 +/- 0.048 (p less than 0.001), and energy charge decreased from the control value of 0.856 +/- 0.012 to 0.0806 +/- 0.011 (p less than 0.01). From these results, it was suggested that hemodilution exerts no influence on the energy status of the liver as long as hematocrit is maintained above 20%.

Adenine Nucleotides↗