Table 4.
Population pharmacokinetic parameter estimates for a typical infant (fixed effects)
Parameter | Units | Estimates (Standard Error) | ||
---|---|---|---|---|
Single IV Administration Dataset | Multiple IV Administration Dataset | Combined Dataset | ||
Model Parameters | ||||
V – volume | l/kg | 0.5115 (0.0345) | 0.6572 (0.0707) | 0.5610 (0.0341) |
Cl – clearance | (l/kg)/h | 0.0679 (0.0064) | 0.0577 (0.0061) | 0.0616 (0.0048) |
R – endogenous infusion rate | (mg/kg)/h | 2.666 (0.2762) | 2.369 (0.3151) | 2.449 (0.2336) |
Standard deviation of residual error | mg/l | 18.71 (1.048) | 24.77 (0.971) | 22.96 (0.739) |
Derived Values | ||||
k – elimination rate (=Cl/V) | 1/h | 0.1327 (0.0154) | 0.0878 (0.0137) | 0.1098 (0.0109) |
t1/2 – half=life (=.693/k) | h | 5.22 (0.605) | 7.90 (1.229) | 6.31 (0.631) |
E – concentration due to endogenous infusion (=R/Cl) | mg/l | 39.26 (1.655) | 41.06 (1.777) | 40.71 (1.255) |