Figure 5. The concentration-time relations of indocyanine green (ICG) and alfentanil in an individual pig, during the first 2 min after the bolus injection. In the inset, the concentration-time relation for alfentanil in the same pig is shown for the entire experiment. The lines describe the fits of the recirculatory model for ICG and alfentanil. The concentrations of ICG, measured and fitted, are corrected for the larger bolus dose given. The upper line describes the fit of the recirculatory model for ICG, and the lower line describes the fit of the recirculatory model for alfentanil. The dots represent the measured ICG concentrations, and the triangles represent the measured alfentanil concentrations.