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Biomedical subjects

T Kaneyuki

Publications and source records attributed to T Kaneyuki.

At least 37 records · Page 2Linked to original sources
PubMed1981

Influence of liver injury on testosterone 5 alpha-reductase activity in the rat diencephalon.

Diencephalon testosterone 5 alpha-reductase activity and plasma testosterone level were measured in the rat with liver injury caused by i.p. administration of CCl4. Testosterone levels in plasma were decreased after CCl4 injection in both group I (0.1ml/150g B.W./once a day for 2 days) and group II (0.01ml/150g B.W./twice a week for three weeks). 5 alpha-Reductase activity in the diencephalon was decreased both on the 7th day after administration in group I and in group II, while being transiently increased on the 1st day after administration in group I. These results suggest that testosterone metabolism in the brain is inhibited during liver disorders.

3-Oxo-5-alpha-Steroid 4-Dehydrogenase↗
PubMed1980

Leiomyoma of the left posterior tibial artery: a case report.

A case of leiomyoma of the left posterior tibial artery is presented. This tumor produced aneurysmal dilatation of the artery and was treated successfully by surgery. This may be the first documented case of a benign smooth muscle tumor, although nearly 100 leiomyosarcomas arising from large arteries and veins have been described in the literature.

Aged↗
PubMed1979

Sex hormones metabolism in the brain: influence of central acting drugs on 5 alpha-reduction in rat diencephalon.

Rats after adrenalectomy-testectomy showed a gradual increase in diencephalon 3-oxo-5 alpha-steroid: (acceptor) delta4-oxidoreductase (5 alpha-reductase) activity for 3 days. The activity then returned near to the normal range on the 4th postoperative day. When rats were given testosterone propionate (TP) 3 days after adrenalectomy-testectomy, diencephalon 5 alpha-reductase activity returned to the preoperative range 2 hr after TP administration. Diencephalon 5 alpha-reductase activity showed a highly significant increase (p less than 0.01) after a single administration of carbamazepine, reserpine, diazepam, phenytoin, phenobarbital or disulfiram. A significant increase (p less than 0.05) was also found after a single administration of methylphenidate, caffeine or methamphetamine. Plasma testosterone decreased concurrently after administration of all these agents, except diazepam. Diencephalon enzyme activity decreased significantly after repeated disulfiram administrations (p less than 0.01) but increased significantly after methamphetamine administrations (p less than 0.05). Plasma testosterone showed a tendency to decrease after repeated methamphetamine administrations but tended to increase after repeated disulfiram administrations.

3-Oxo-5-alpha-Steroid 4-Dehydrogenase↗
PubMed1977

Diaphragm pacing. Evaluation of current waveforms for effective ventilation.

To evaluate the effectiveness of the configuration of the stimulating waveform on diaphragm pacing, we evaluated several different current forms: UDC-bipolar, UDC-monopolar cathodal, UDC-monopolar anodal, and ABDC. During stimulation with a pulse interval of 37 msec., a decrease in tidal volume was observed during the initial 30 hours with UDC-bipolar and UDC-monopolar anodal waveforms. Both UDC-monopolar cathodal and ABDC stimulation maintained the initial effectiveness for 6 hours. The decrease in tidal volume of UDC-monopolar anodal closely paralleled that of UDC-bipolar stimulation. Decreasing the pulse interval to 20 msec. caused a decrease in tidal volume with both UDC-monopolar cathodal and ABDC waveforms. Arterial oxygen tension (PaO2) in these experiments decreased to about 60 mm. Hg soon after the onset of unilateral diaphragm pacing. The concomitant decrease in tidal volume seen with UDC-bipolar stimulation could be avoided through the administration of oxygen to keep the animal's PaO2 about 100 mm. Hg. The amplitude of the evoked diaphragmatic action potentials decreased significantly under hypoxemia and returned to normal with hyperoxygenation. From these short-term experiments, our findings indicate that waveform configuration does influence the time of onset of diaphragm fatigue due to either an neuromuscular junction. Further, hypoxemia accelerates the occurrence of fatigue.

Acetylcholine↗
PubMed1976

Diaphragm pacing: histopathological changes in the phrenic nerve following long-term electrical stimulation.

Phrenic nerves were obtained at autopsy from 7 patients with chronic ventilatory insufficiency. One or both nerves had been subjected to electrical stimulation to pace the diaphragm for about 2 months to 4 years. Sections of the nerves made from above, at the level of, and below the site of application of the cuff electrode were studied microscopically. In most specimens, focal areas of demyelination were seen ranging from severity from swelling and fragmentation of isolated fibers to focal myelin destruction with phagocytic activity and total removal of myelin with fibrosis. Some axone loss was seen. The fact that the nerves from 2 patients, each stimulated for about 2 years, showed no changes suggests that injury to the nerve was not caused by the electrical stimuli but rather was secondary to the technique of application and fixation of the cuff electrode to the nerve.

Adult↗