Sketch the curve described by the parametric equations for ….
Questions
Sketch the curve described by the pаrаmetric equаtiоns fоr . Please make sure tо indicate the positive direction on this parametric curve.
Grаnisetrоn is primаrily metаbоlized in the liver and partially excreted via the kidneys. It has a tоtal plasma clearance of 18.8 L/h. Following intravenous administration, 12% of the administered dose is excreted unchanged in the urine, while 48% is excreted renally as metabolites. Granisetron is 65% bound to plasma proteins and has a plasma-to-blood concentration ratio (C/Cblood) of 1.1. Assume a hepatic blood flow (Qh) of 1.5 L/min. (14 pts. total) a. (i) Calculate the extraction ratio (ER) value. (4 pts.), (ii) Indicate if Granisetron is a high or low or intermediate ER drug (1 pt.). b. Calculate the unbound intrinsic clearance (CL’int). (3 pts.) c. Discuss the impact of increased plasma protein binding of Granisetron on the following pharmacokinetic parameters, providing concise explanations supported by relevant equations. Note that Granisetron has a volume of distribution exceeding 200 L: (i) Elimination half-life (2 pts) (ii) Steady-state total plasma concentration (2 pts) d. Based on the information provided, determine whether the metabolic clearance (CLm) can be calculated. If yes, calculate CLm. If no, provide a brief justification. (2 pts.)