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Guanidino compounds are increased in uremia and have been implicated as uremic toxins. The serum concentrations of 13 guanidino compounds and the clearances of 10 guanidino compounds were determined in 15 steady-state uremic patients treated with continuous ambulatory peritoneal dialysis. Guanidino compounds were determined using liquid cation-exchange chromatography with a sensitive fluorescence detection method. Standardized dialysis procedures were performed, including an overnight and a 3-hour dwell period. Guanidino compound levels did not significantly differ at the end of an overnight or a 3-hour exchange, indicating a steady-state blood chemistry for these substances in chronic ambulatory peritoneal dialysis. High levels were found for guanidinosuccinic acid, creatinine, guanidine and methylguanidine, while creatine and homoarginine levels were lower than in controls. Guanidinosuccinic acid, creatinine and methylguanidine reached levels associated with toxic effects in vitro. Significantly different clearances were found ranging from 4.02 +/- 1.08 ml/min for arginine to 7.94 +/- 2.76 ml/min for creatine during a 3-hour exchange.
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