Correlation of C0 and C2 levels with lipid profiles in adolescent renal transplant recipients in the early and late posttransplant periods.

Hyperlipidemia is a frequent complication after renal transplantation. Cyclosporine therapy is an important cause of hyperlipidemia. It is still controversial whether C0 or C2 is the most effective way to monitor blood cyclosporine concentrations to guide dosages. We sought to evaluate the relationship of C0 or C2 to serum lipid levels in the early and late posttransplant periods among adolescent renal transplant recipients. The posttransplantation charts of 26 adolescent renal transplant recipients were evaluated retrospectively. Serum C0 and C2 levels and serum lipid (triglyceride and total cholesterol) levels were analyzed both in the early (first 6 months) and the late (thereafter) posttransplant periods. Hypertriglyceridemia and hypercholesterolemia were defined as levels above the 95th percentile adjusted for age and gender. To evaluate the influence of C0 and C2 levels on serum lipids, we excluded one patient with familial hyperlipidemia. In addition, serum lipid levels of the remaining 25 patients were excluded in acute rejection periods and when the serum creatinine levels were above 2.5 mg/dL, representing chronic allograft nephropathy. Concurrently recorded serum C0 and C2 levels were present for only 21 patients. Overall, we evaluated the records of 245 visits for these 21 patients. The incidence of hyperlipidemia decreased in the late posttransplant period, being significant for hypercholesterolemia. C2 had strong negative correlation with serum lipids; it was significant for total cholesterol in the early posttransplant period (r=-0.542, P=.005), but weaker in the late posttransplant and whole posttransplant periods. Thus correlation of C2 with serum lipids showed differences during posttransplant follow-up. C0, on the other hand, was positively correlated with total cholesterol levels in all periods, being significant for the whole posttransplant period (r=0.293, P=.000) and for the late posttransplant period (r=0.196, P=.025). Although not statistically significant, C0 levels were higher among hypertriglyceridemic or hypercholesterolemic episodes both in the early and the late posttransplant periods. When only the C0 levels of all 25 patients were analyzed (789 visits), C0 and serum cholesterol levels were positively correlated both in the early and the late posttransplant periods (P=.013, r=0.198 and P=.000, r=0.177, respectively). We concluded that C0 has a more predictable correlation with serum cholesterol levels after renal transplantation in adolescent patients.