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Test of the amount of LPL available in the system at 40 minutes and during the end of a HD with tinzaparin. A bolus of UF-heparin (50 units/kg body weight, intravenously) was given after 180 min of HD with tinzaparin to evaluate the extent of residual LPL on the endothelial sites. Eleven of the patients accepted to participate in this second step of investigation. Blood samples were taken at 180, 210 and 240 min (i.e. 0, 30 and 60 min after the bolus of UF-heparin).
