[Effect of furosemide on transperitoneal transport of guanidine derivatives: in vitro studies].

The transperitoneal transport dynamics (removal) of guanidinoacetic acid (GAA) and guanidinosuccinic acid (GSA) has been determined in vitro in the control conditions and after application of furosemide (10(-4) mmol/l) on the mesothelial side of the membrane. GAA peritoneal transfer values, as a rule, were higher than GSA and equaled at mean, in the control series of experiments 0.132 i 0.068 mg x 10(-4) x cm-2 x s-2, respectively. Furosemide decreased GSA passage in 30 min after it addition by about 30%, but GSA transfer diminished later, in 120 min., by about 37%. Therefore, mean GAA transport values before (30-90 min.) and after application of furosemide (120-210 min.) were not statistically significant differentiated, whereas GSA transport parameters were lowered by about 40%. Heterogeneity of the peritoneal GAA and GSA transport dynamics in the control series of the experiments, as well as in the series with furosemide, may be related to the physico-chemical differences (e.g. molecular mass) of the analysed derivates.