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Biomedical subjects

T Hyodo

Publications and source records attributed to T Hyodo.

At least 55 records · Page 3Linked to original sources
PubMed1993

Influence of adrenalectomy on the developing rat thymus during peri-weaning period.

Adrenalectomy of 17-, 18- and 19-day-old male and female rats did not cause any changes in the weight of thymus 4 days later. Adrenalectomy on day 20 of age induced a significant hypertrophy of the thymus 4 days later. These results indicate that on day 20 of age, just before weaning, the thymus is under some inhibitory regulation by the adrenal gland.

Adrenal Glands↗
PubMed1993

[Vitreous surgery for mycotic endophthalmitis].

We treated eight eyes of five patients with mycotic endophthalmitis. Intraocular inflammatory changes in one of these eyes improved only by antifungal therapy with 21-day administration of miconazole and fluconazole. The other seven eyes underwent vitrectomy, and the preoperative periods between the onset of ocular complications and the operation ranged from one and a half months to three months, during which time fungi were isolated only in one case. Dense vitreous opacities caused by the colonies of the fungi were found in the all vitrectomized eyes. Vitrectomy in the three cases showing no retinal detachment was effective for the improvement of either visual acuity or ophthalmoscopic findings, whereas vitrectomy was not effective in the other two cases with the occurrence of the pre-retinal membrane causing traction retinal detachment. The present investigations suggest that persistent endophthalmitis and the appearance of total retinal detachment made the improvement of retinal changes difficult because of the inflammatory and fibrotic processes between the retina and the vitreous body. It, therefore, is shown that anti-fungal therapy should be initiated when mycotic endophthalmitis is suspected, but in cases without response to the drug, vitrectomy should be performed before retinal detachment occurs.

Aged↗
PubMed1988

Long-lasting organic spasm of the near reflex.

A 57-year-old man was examined after head trauma and found to have long-lasting organic spasm of the near reflex lacking accommodative spasm. Convergence and miosis had been consistently observed for the follow-up period of one year and three months. Electrooculographical findings showed that there was no lateral rectus muscle palsy in either eye, and that his esotropia became intense in total darkness, compared with fixation on a visual target. Persistent convergence and miosis completely disappeared within 7 minutes after intravenous injections of benzodiazepine. Furthermore, he was able to make a normal near reflex when the spasm disappeared. The effect of benzodiazepine suggests that the disturbance of the GABAergic (gamma-aminobutyric acid) inhibitory system in the near reflex may be responsible for the occurrence of the spasm.

Benzodiazepines↗
PubMed1986

Hemodynamic effects of labetalol in the dog. Comparative study in the anesthetized open-chest dog and in the conscious dog.

Hemodynamic effects of labetalol, an alpha- and beta-adrenoceptor blocking drug, were investigated in the conscious dog and in the anesthetized open-chest dog. In the conscious dog, intravenous injection of labetalol, in a dose of 0.5 mg/kg, decreased the total peripheral resistance by approximately 20% (P less than 0.01) in association with falls in blood pressure and heart rate. The total peripheral resistance of the anesthetized open-chest dog was not affected by labetalol in the presence of the same extent of blood pressure fall as results of the conscious dog. In contrast, agents which have beta-adrenoceptor blocking effect alone provided substantial elevation of the total peripheral resistance in the anesthetized dog. These results indicate that the different responses of the resistance to labetalol probably result from the vascular alpha-adrenoceptor blocking action, and also show that in the conscious state alpha-adrenoceptor blocking action of labetalol is enhanced in comparison with the effect in the anesthetized open-chest dog.

Adrenergic beta-Antagonists↗
PubMed1985

Effect of adenosine deaminase inhibitors on myocardial reactive hyperaemia following brief coronary occlusions.

Effect of two agents of adenosine deaminase inhibitor, 8-azaguanine and adenine, on myocardial reactive hyperaemia was tested in the anaesthetised open-chest dog. Reactive hyperaemic flow response of the circumflex coronary artery was observed following 5, 10, 15, 20 and 30 s coronary occlusions before, during and after infusion of 8-azaguanine and adenine, which are known as adenosine deaminase inhibitors. Intracoronary infusion of 8-azaguanine and adenine caused the minimum increase in the baseline coronary flow. Both the nucleic acids shifted the dose response curve of adenosine to the left. 8-azaguanine enhanced volume response of flow at all occlusion intervals tested. The infused dose of adenine also intensified volume response of flow after 5, 15, 20 and 30 s occlusions. Fifteen minutes after termination of the nucleic acid infusions, the reactive hyperaemia returned towards control levels. The results suggest that 8-azaguanine and adenine enhance myocardial reactive hyperaemia possibly by inhibiting adenosine deaminase to degradate myocardial interstitial adenosine to inosine.

Adenine↗
PubMed1985

Intracoronary adenosine enhances myocardial reactive hyperemia after brief coronary occlusion.

Adenosine is a prime candidate for the role of mediator between myocardial metabolic state and coronary blood flow. However, there are few reports concerning the direct effects of exogenously added adenosine on coronary autoregulation. The present investigation in the open-chest dog studied the effects of a threshold dose of intracoronary adenosine infusion on reactive hyperemia following brief coronary occlusions. The infused dose did not increase nonocclusive flow by greater than 10%. Adenosine enhanced total hyperemic flow at all occlusions tested (5, 10, 15, 20, and 30 s). Aminophylline pretreatment reduced reactive hyperemia below the control level even in the presence of an intracoronary infusion of adenosine. Adenosine injected into the left atrium and intracoronarily infused papaverine did not affect hyperemic response to 5- and 15-s coronary occlusions. The results suggest that a minimum dose of exogenously added adenosine enhances myocardial reactive hyperemia, possibly by potentiating the effects of endogenous adenosine released during ischemia.

Adenosine↗