Abstract
Background:
Patient adherence to immunosuppressant regimens after organ transplant is crucial to preserve graft function, and simplifying the regimen improves adherence. In this study, our experience of conversion from twice-daily (b.i.d.) to once-daily (q.d.) tacrolimus (TAC) in stable liver transplant recipients is reviewed and the proper conversion regimen is investigated.
Methods:
Between November 2011 and August 2012, the regimen was converted in 32 stable liver transplant recipients, and data on the conversions gathered retrospectively from medical records. TAC trough level, dose, and laboratory findings were evaluated at preconversion and 1 to 12 months after conversion.
Results:
Conversion from b.i.d. to q.d. regimen was based on 1:1 proportion in 16 patients and dose escalation in 16 patients. The mean conversion time after transplant was 56.8 months (range; 21∼94). Reconversion to b.i.d. regimen was needed in nine patients. Among these patients, seven patients needed titration due to elevated liver enzyme. The trough level decreased significantly after conversion (from 4.7 to 3.1 ng/mL) in patients with conversion at 1:1 proportion, while increasing slightly without statistical significance (3.7 to 4.0 ng/mL) in patients with dose escalation. At 1 year after conversion, dose adjustment was required to preserve trough level and graft function in 14 patients.
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Table 1.
Characteristic | Value |
---|---|
Sex (males/female) | 24/8 |
Age at conversion (yr) | 55±9.9 (18∼72) |
Time from LT to conversion | 56.8±19.49 (21∼94) |
Immunosuppressant regimen | |
TAC single | 30 |
TAC+MMF | 2 |
History of rejection episode | 5 (16) |
Indications for LT | |
Hepatitis B virus | 18 (56) |
Hepatocellular carcinoma | 10 (31) |
Others | 4 (13) |
Mean TAC dose (mg/day) | 2.03±0.60 (1∼4) |
Baseline mean trough level (ng/mL) | 4.2±1.50 (1.9∼7.4) |
Reconversion to TAC twice-daily | 9 (28) |
Time from conversion to reconversion | 4.4±4.12 (0.9∼11.4) |
Cause of reconversion | |
Elevated AST or ALT (1:1/escalation) | 7 (5/2) |
Uncontrolled trough level | 1 |
Neurologic symptoma | 1 |