A Simple Method for Predicting the Cyclosporin A Erythrocyte-to-Plasma Distribution Ratio in Bolld, and Its Clinical Assessment

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To adapt the monitoring of cyclosporin A (CyA) to clinical practice, we have developed a model to predict the CyA erythrocyte-to-plasma distribution ratio (CyA-EP), and evaluated its utility in clinical practice. We monitored CyA trough concentrations in whole blood and performed a series of biochemical tests during disease states in patients undergoing immunosuppressive therapy with CyA after transplantation. An estimate of CyA-EP (EP_<pr>) was thus given by the following equation : EP_<pr>=6.0831-0.2944×(TG+CHO)-0.0037×(CyA_<blood>)-0.0553×(HCT)+0.0463×(BW)+0.4447×(CRE)-0.0366×(AGE). In this predictive model, EP_<pr> is given as a function of the plasma lipid levels (TG+CHO, mM), the CyA concentration in whole blood (CyA_<blood>, ng/ml), and the hematocrit (HCT, %), as well as the patient's body weight (BW, kg), serum creatinine (CRE, mg/dl) and age (AGE, years). The parameters TG+CHO, CyA_<blood>, HCT, and AGE were negatively correlated with the CyA-EP, whereas BW and CRE exhibited a positive correlation. The predictive performance of this model was satisfactory for clinical use and changes in CyA-EP in transplant patients were obtained from monitoring CyA in whole blood and routine biochemical tests, without directly measuring CyA-EP. Since CyA-EP is an useful indicator for predicting a shift of CyA into tissues and its systemic clearance in plasma, our model to predict the CyA-EP will help the physician select a CyA regimen during immunosuppressive therapy in a variety of disease states after trans plantation.
社団法人日本薬学会の論文
1994-05-15

A Simple Method for Predicting the Cyclosporin A Erythrocyte-to-Plasma Distribution Ratio in Bolld, and Its Clinical Assessment

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