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  • A S Salim
  • 1990
This study investigated whether or not oxygen-derived free radicals are implicated in the mechanism of recurrence of duodenal ulceration. To this end, allopurinol (50 mg qds)--a hydroxyl scavenger and an inhibitor of xanthine oxidase which forms superoxide radicals--and dimethyl sulphoxide (DMSO, 500 mg qds)--a hydroxyl scavenger--were given orally. Three(More)
Oxygen-derived free radicals are cytotoxic and mediate tissue damage. Allopurinol prevents the formation of superoxide radicals and dimethyl sulphoxide (DMSO) scavenges the hydroxyl ones. Intraperitoneal reserpine (5 mg/kg every day for 5 days) produced chronic gastric ulceration in all rats after 4 weeks. Animals gavaged with 1 ml/day of each of 1%(More)
This prospective randomized study investigated the possibility that duodenal ulcer relapse associated with Helicobacter Pylori infection is mediated by oxygen-derived free radicals. To this end, the radical scavengers allopurinol (50 mg 4 times daily) and dimethyl sulphoxide (DMSO, 500 mg 4 times daily) were administered orally. One hundred and forty-six(More)
  • A S Salim
  • 1992
This double-blind, randomized study investigated the role of oxygen-derived free radical scavengers in the management of recurrent attacks of ulcerative colitis. To this end, allopurinol (50 mg four times a day) and dimethyl sulfoxide (500 mg four times a day) were administered orally. Patients with recurrent attacks of moderate proctosigmoidal ulcerative(More)
This randomized double-blind trial examined the influence of the radical scavengers allopurinol (50 mg per rectum, four times per day) and dimethyl sulfoxide (500 mg per rectum, four times per day) on pancreatic pain treated with intramuscular pethidine hydrochloride (100 mg followed by 50 mg every 4 hours until complete pain relief) in patients given(More)
  • A S Salim
  • 1992
This prospective, randomized, double-blind study examined whether scavengers of oxygen-derived free radicals are of benefit in the treatment of acute duodenal ulceration in human beings. To this end, allopurinol (50 mg four times a day), a hydroxyl radical scavenger and an inhibitor of xanthine oxidase that forms superoxide radicals, and dimethyl sulfoxide(More)
  • A S Salim
  • 1993
The influence of oxygen-derived free radicals on survival in advanced colonic cancer was assessed in a prospective randomized controlled double-blind trial using the radical scavengers dimethyl sulphoxide (DMSO) and allopurinol. Following palliative sigmoid colectomy for carcinoma at Dukes' stage D, 306 patients were randomized to the control group or to(More)
This paper reviews the role of the central nervous system in the genesis of gastrointestinal mucosal injuries. The discussion makes particular reference to the significance and mechanism of stress-induced injury of the gastroduodenal mucosa. It points out that in the rat, stress activates the hypothalamus, producing delivery of alpha-adrenergic stimulation(More)
  • A S Salim
  • 1991
Oxygen-derived free radicals are cytotoxic and promote tissue damage. Dimethyl sulfoxide (DMSO) and allopurinol scavenge hydroxyl radicals, and the latter agent also inhibits the enzyme xanthine oxidase, which is responsible for the formation of superoxide anions. These agents were given daily by gavage (1 ml/d). After 2 days of administration as 1, 2, or(More)
The effect of the radical removing agents, allopurinol and dimethyl sulphoxide (DMSO), on the healing rate of ethanol (1 ml of 40% solution) induced gastric mucosal injury was studied in the rat. One millilitre of 1, 2 or 5% allopurinol or DMSO were instilled into the stomach 1, 24 and 48 h after giving ethanol by gavage. One hour after administration of(More)