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Biomedical subjects

A Ia Bunin

Publications and source records attributed to A Ia Bunin.

At least 19 recordsLinked to original sources
PubMed1991

[Potentiation by promethazine of hypotensive effects of adrenergic drugs on intraocular pressure].

Experiments including previous installations of promethazine (pipolphen) into the conjunctival sac followed by the topical administration of beta-adrenergic blocker timolol or a sympathomimetic drug isoptoepinal (adrenaline) have been performed on 24 rabbits (48 eyes). The substantial changes in the action mode of the mentioned drugs as the enhancement of their hypotensive effect on the intraocular pressure (IOP) have been demonstrated under the performance of the above mentioned procedure. When applied after promethazine instillations, timolol induced significantly increased outflow facility of the aqueous humor that was not usually noted in the cases of timolol topical instillations without a pretreatment of the eye with promethazine. The similar increased hypotensive effect on the IOP was noted for adrenaline when it has been used after promethazine treatment. The possible mechanisms underlying the changes in pharmacological activities of the investigated adrenergic drugs are discussed.

Adrenergic beta-Antagonists↗
PubMed1988

[Effect of carnosine on intraocular pressure].

It has been demonstrated in experiments on non-anesthetized rabbits that conjunctival injection of carnosine (beta-alanyl 1-histidine) caused a decrease in normal intraocular pressure and reduced prostaglandin-induced ocular hypertension. The rapid onset of the pressure response and the absence of papillary dilation in rabbits treated with carnosine were observed. It is concluded that L-carnosine can be used as a potent drug for the prevention of reactive hypertension syndrome.

Animals↗
PubMedDate not supplied

[A glutathione deficiency in open-angle glaucoma and the approaches to its correction].

A total of 151 patients with open-angle glaucoma, 23 ones with closed angle glaucoma, and 57 ones with age-associated cataracts were examined. The reference group consisted of 21 subjects with posttraumatic cataracts (1.5 years after the injury) and normal subjects. Nonprotein sulfhydryl groups (glutathione) were measured in the peripheral blood, aqueous humor, and in tissue samples from the scleral drainage sites, obtained in antiglaucoma surgery and in surgery for cataract extraction. Aqueous humor of patients with posttraumatic cataracts, blood samples of these patients and normal subjects were examined for control. The level of sulfhydryl groups was found significantly lowered in the anterior chamber humor of patients with open-angle glaucoma, particularly in those with disease Stages II and III as against the controls. The content of sulfhydryl groups was lowered in the tissue samples from the scleral drainage area of patients with open-angle glaucoma Stages II and III vs. that in the patients with Stage I condition. Similar changes were found in the red cells of patients with Stages II and III open-angle glaucoma. Glutathione is an important component of the cellular antioxidant system. The findings point to a reduction of the processes of antioxidant defense of ocular tissues, developing as early as in the first stage of open-angle glaucoma. Lipoic acid administration for 2 months was associated with a rise of glutathione level in the red cells of patients with Stages II and III open-angle glaucoma.

Adult↗
PubMedDate not supplied

[Results of combined use of taufon and timolol in the treatment of patients with open-angle glaucoma].

The effect of taufon and timolol maleate combination on intraocular pressure and ocular hemodynamics was studied in 44 patients (63 eyes) with primary open-angle glaucoma. Combined administration of these agents elevated almost twofold the fluid discharge efficacy coefficient and normalized Becker's coefficient in 68.6 percent of patients. The patients were followed up for 8 weeks. Taufon addition to timolol modified the action of this latter drug, normalizing the ocular hemodynamics.

Adult↗
PubMedDate not supplied

[Pathogenetic factors in thrombosis of the central retinal vein].

Studies of the hemorheologic parameters and the hemostasis system components in the blood and lacrimal fluid of 130 patients with thrombosis of a branch of the central retinal vein (CRV) and calibrometry of the CRV have lead the authors to a conclusion that the major factors contributing to the pathogenesis of CRV thrombosis are (1) disordered blood rheology; (2) changes in the local hemostatic potential; (3) impaired blood stream in the corresponding CRV branches. Rationale for the use of drugs normalizing the blood rheology in CRV thrombosis is given.

Adenosine Monophosphate↗