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Abbreviated tacrolimus area-under-the-curve monitoring for renal transplant recipients

2000; Elsevier BV; Volume: 35; Issue: 4 Linguagem: Inglês

10.1016/s0272-6386(00)70013-8

1523-6838

Kim Ming Wong, Chi Chung Shek, Ka Foon Chau, Chun Sang Li,

Transplantation: Methods and Outcomes

The area under the concentration time curve (AUC) for oral tacrolimus (FK) may provide a more precise model for FK monitoring after renal transplantation. The purpose of this study is to identify a simple, cost-effective method for predicting FK AUC. FK concentrations were measured at 0, 1, 2, 4, 6, 8, and 12 hours after the morning dose. The predicted AUCs (AUCp s) derived from regression equations were used to estimate the actual 12-hour AUCs (AUC12 s). The relationship between AUCp and AUC12 was validated by determining the coefficient of multiple determination (R2 ), percentage of prediction error (PE%), and percentage of absolute prediction error (APE%). Eighteen stable Oriental renal transplant recipients (9 men, 9 women) with a mean age of 42.6 ± 6 years and mean body weight of 62.7 ± 10 kg were recruited for the study. The FK AUC12 , trough, 2-hour, and 4-hour concentrations were 125 ± 24 h · ng/mL (range, 87.7 to 181.9 h · ng/mL), 6 ± 1.3 ng/mL, 18.1 ± 4.7 ng/mL, and 11 ± 2.4 ng/mL, respectively. Trough FK concentration did not have a significant correlation with AUC12 (r = 0.34; P = 0.17). AUCp obtained by a two–time point regression equation using 2-hour (C2) and 4-hour (C4) FK concentrations: (AUCP = 16.2 + 2.4*C2 + 5.9*C4) obtained an R2 , PE%, and APE% of 0.93, –0.2% ± 5.2% (range, –13% to 9.3%), and 3.6% ± 3.7% (range, 0.02% to 13%), respectively. We conclude that a two-point sampling method using C2 and C4 may be a more cost-effective FK monitoring strategy than morning FK trough levels in transplant recipients.