Cigarette smoking, a key risk factor for the development of vascular disease, is associated with an increased 8-epi-prostaglandin (PG) F(2alpha). Elevated 8-epi-PGF(2alpha) has been found in vascular tissue, blood and urine as well. We examined the influence of quitting cigarette smoking in 71 patients (38 males, 33 females; aged 32-67 a) with clinically manifested atherosclerosis and various risk factors. In addition, in eight patients with hypercholesterolemia without clinical manifestation of atherosclerosis quitting smoking was monitored as well. Twenty-six of the patients with manifested atherosclerosis and five with hypercholesterolemia restarted and the isoprostanes in plasma, serum and urine were monitored in these patients as well. Quitting cigarette smoking induces an immediate decline becoming significant after 1 or 2 weeks. Restarting smoking results in an increase in 8-epi-PGF(2alpha) reaching prevalues within almost 1 week. These findings indicate that the in vivo oxidation injury associated with cigarette smoking quickly decreases after quitting but increases soon after restarting immediately.
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