The effect of desmopressin (DDAVP) on protein C (PC) and PC inhibitors
was investigated in 7 uremic predialysis patients, 7 hemodialysis pat
ients and 7 controls. Significant decrease in PC activity was observed
in all groups after DDAVP administration. Desmopressin did not influe
nce PC antigen and two well-known PC inhibitors, plasminogen activator
inhibitor-3 and alpha1-antitrypsin. Thus, it is suggested that DDAVP-
induced decrease in PC activity is not related to the changes in PC in
hibitors; further studies are needed to clarify the precise mechanisms
of the effect of DDAVP on PC in uremia.