Summary
To study the mechanism underlying the high lipoprotein (a) [Lp(a)] level in uremic
patients on chronic hemodialysis, we investigated the levels of Lp(a), acute phase
reactants (C-reactive protein and sialic acid), and interleukin-6 (IL-6) in 54 dialysis
patients. The mean [95% Cl] Lp(a) level was increased in the hemodialysis patients
compared with the 30 controls (30 [25-36] vs. 18 [14-23] mg/dl, p <0.005). Among dialysis
patients, 46% had an Lp(a) level >30 mg/dl, which was significantly higher than the
percentage in the control group (17%). The levels of C-reactive protein, sialic acid,
and IL-6 were also increased in dialysis subjects compared with controls (200 [134-299]
vs. 37 [24-58] μg/dl, p <0.0001; 63 [59-66] vs. 54 [52-56] mg/dl, p <0.002; and 9.2
[7.8-11] vs. 5.5 [5.0-6.1]pg/ml, p <0.0005, respectively). The Lp(a) level was positively
correlated with that of C-reactive protein (r = 0.415, p <0.002), sialic acid (r =
0.426, p <0.002), and IL-6 (r = 0.298, p<0.05) in the hemodialysis patients, but not
in the controls or non-dialysis uremic patients. The Lp(a) level in the dialysis patients
was also positively correlated with activation markers of coagulation (thrombin-antithrombin
III complex and plasmin-α2-plasmin inhibitor complex, p <0.005). These results indicate that the Lp(a) level
is closely related to the acute phase reaction and hypercoagulability in chronic hemodialysis
patients.