Effect of acute antioxidant overdose on blood hemostasis: experimental study

The current study was carried out to investigate the effects of the excessive use of large doses of the most widely used antioxidants, d-alpha-tocopherol [vitamin E], retinol acetate [vitamin A], and l-ascorbic acid [vitamin C], on the blood hemostasis. 140 albino rats were divided into 4 experimental groups of 40 animals each as follows: Group I: A control group [negative and positive]; Group II: Each animal of this group received a daily oral dose of 24 mg of d-alpha-tocopherol; Group III: Each animal of this group received a daily oral dose of 1mg of Trans-retinol acetate, and; Group IV: Each animal of this group received a daily oral dose of 20 mg of l-ascorbic acid. The results of the current study have revealed that both d-alpha-tocopherol and retinol acetate produced a significant prolongation of prothrombin time [PT] and activated partial thromboplastine time [PTT] with a significant reduction of factor X activity. On the contrary, l-ascorbic acid produced no significant effect on these parameters. Histopathological examination of liver, kidney, and brain specimens of the different treated animal groups revealed the presence of significant hemorrhages in most samples of both d-alpha-tocopherol- and retinol acetate-treated animals, while the specimens of l-ascorbic acid-treated animals showed no hemorrhage in nearly all samples. These histopathological changes were confirmatory to the biochemical ones. It could be concluded that the excessive use of large doses both d-alpha-tocopherol and retinol acetate alters the blood hemostasis with increased bleeding tendencies, while l-ascorbic acid doesn't. In fact, l-ascorbic acid could be considered a safe drug even in excessive doses for long periods

Neurotoxicity of the commenest volatile substances abused in El-Minia Governorate: clinical and experimental study

The current study was. performed to investigate the possible neurotoxic effects of chronic solvent abuse of some of the commonest abused substances in El-Minia governorate, namely, acetone and diethyl ether, and whether these changes, if present, are reversible or not. It was carried out as 2 parts: 1[st] part; 50 male persons aging between 20-45 were divided into 5 groups of 10 subjects each: group I; a normal volunteer control group, group II exposed daily to acetone for 1-2 year[s], group III: exposed daily to acetone for 8-10 year[s], group IV: exposed daily to diethyl ether for 1-2 year[s], group IV: exposed daily to diethyl ether for 8-10 year[s]. All subjects were examined thoroughly for any neuropsychiatric disorders 3 times 3 months apart. The 2[nd] part; 180 albino rats divided into 9 groups of 20 rats each as follows: group I: a control group received a daily oral dose of 1.5 ml of physiological saline for 1 month, group II: exposed to a daily dose of acetone [1250 ppm. / 30 min.] for 1 month, then examined immediately, group III: exposed to a daily dose of acetone [1250 ppm. / 30 min.] for 1 month, left for 1 month without any medical intervention, then examined, group IV: exposed to a daily dose of acetone [1250 ppm. / 30 min.] for 3 months, then examined immediately, group V: exposed to a daily dose of acetone [1250 ppm. / 30 min.] for 3 months, left for 1 month without any medical intervention, then examined, group VI: exposed to a daily dose of diethyl ether [2000 ppm. / 30 min.] 1 month, then examined immediately, group VII: exposed to a daily dose of diethyl ether [2000 ppm. / 30 min.] 1 month, left for I month without any medical intervention, then examined, group VIII: exposed to a daily dose of diethyl ether [2000 ppm. / 30 min.] for 3 months, then examined immediately, and group IX: exposed to a daily dose of diethyl ether [2000 ppm. / 30 min.] for 3 months, left without any medical intervention for 1 month, then examined. The results of the 1[st] part of the current study revealed that persons of the groups II and IV had mild neuropsychyatric disorders and that these changes were much more severe in the persons of group III and V as well as the appearance of another serious disorders including parkinsonism, cerebellar dysfunction, and cranial nerve affection. The results of the 2[nd] part revealed that animals of groups II and VI showed profound pathological changes of the cerebral cortex and cerebellum ranging from mild to moderate degrees with higher incidence towards the mild one. In addition, the animals of groups IV and VIII showed similar changes with increased incidence of the moderate degree. Moreover, animals of groups III and VII showed a mild improvement of the reported pathological changes when compared to those examined immediately after the last dose. On the other hand, animals of groups V and IX showed no improvement and nearly were the same when compared to those of groups IV and VIII. It could be concluded that volatile substance abuse induces serious neuropsychiatric and pathological changes, and that severity of the pathological changes increases with the increase of period of abuse, while reversibility becomes less likely