[Lipid peroxidation markers in the exhaled breath and microsomal oxidation in patients with chronic diffuse liver diseases].

Low-molecular hydrocarbons (butan, pentan) from the exhaled air as lipid peroxidation (LPO) markers were quantified in patients with chronic diffuse liver diseases. The study was also made of microsomal oxidation enzymic activity by antipirin metabolism. The above parameters were followed up in the course of antioxidant treatment. As shown by total butan and pentan levels, LPO activity varied with the disease, being high in hepatic cirrhosis and primary biliary cirrhosis, but low in chronic active hepatitis and fat dystrophy. Increased levels of butan and pentan occurred in association with inhibited activity of P450-dependent monooxygenases. This was determined by antipirin biotransformation and confirmed by a strong inverse correlation between the amount of hydrocarbons and antipirin metabolites (4-hydroxy- and norantipirin) clearance. In the course of antioxidant therapy the most pronounced inhibiting action on formation of low-molecular hydrocarbons was distinctive of essenciale, pikamilon and copmplivit. Relevant efficacy of carsil was weaker. Similar regularity for these drugs takes place in relation to activation of microsomal oxidation.