There were 2 study periods in this study. In the Period 1, CP-690,550 was to be administered approximately 1 to 2 hours following hemodialysis. If significant non-renal clearance of the drug occurred such that dialyzability of CP-690,550 could not be assessed in Period 1, a second period (Period 2) will be conducted. In Period 2, a single dose of drug will be administered approximately 4 hours prior to hemodialysis.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
12
CP-690,550 10 mg oral powder for constitution
Pfizer Investigational Site
Orlando, Florida, United States
Pfizer Investigational Site
Minneapolis, Minnesota, United States
Area Under the Curve From Time Zero to Extrapolated Infinite Time [AUC (0 - ∞)]
AUC (0 - ∞)= Area under the plasma concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0 - ∞). It is obtained from AUC (0 - t) plus AUC (t - ∞).
Time frame: 0 (pre-dose), 0.25, 0.5, 1, 2, 3, 4, 8, 12, 16, 24 hours (hrs) post-dose in Period 1
Area Under the Curve From Time Zero to Last Quantifiable Concentration (AUClast)
Area under the plasma concentration time-curve from zero to the last measured concentration (AUClast)
Time frame: 0 (pre-dose), 0.25, 0.5, 1, 2, 3, 4, 8, 12, 16, 24 hrs post-dose in Period 1
Maximum Observed Plasma Concentration (Cmax)
Time frame: 0 (pre-dose), 0.25, 0.5, 1, 2, 3, 4, 8, 12, 16, 24 hrs post-dose in Period 1
Time to Reach Maximum Observed Plasma Concentration (Tmax)
Time frame: 0 (pre-dose), 0.25, 0.5, 1, 2, 3, 4, 8, 12, 16, 24 hrs post-dose in Period 1
Plasma Decay Half-Life (t1/2)
Plasma decay half-life is the time measured for the plasma concentration to decrease by one half.
Time frame: 0 (pre-dose), 0.25, 0.5, 1, 2, 3, 4, 8, 12, 16, 24 hrs post-dose in Period 1
Oral Clearance (CLpo)
Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes. Drug clearance is a quantitative measure of the rate at which a drug substance is removed from the blood. It was calculated by dividing given dose of drug with AUC.
Time frame: 0 (pre-dose), 0.25, 0.5, 1, 2, 3, 4, 8, 12, 16, 24 hrs post-dose in Period 1
Dialyser Clearance (CL HD) From 0 to 1 Hour
Dialyser clearance was calculated as amount of drug in dialysate collected over a period of time (AHD) divided (/) by the product of fraction unbound of drug in plasma (fu), corresponding mid-time plasma concentration of drug (Cmid), and duration of dialysate collection period (tm). CL HD = AHD/(fu\*Cmid\*tm).
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Time frame: 0 to 1 hrs during hemodialysis started 4 hrs post-dose in Period 2
Dialyser Clearance (CL HD) From 1 to 2 Hour
Dialyser clearance was calculated as amount of drug in dialysate collected over a period of time (AHD) divided by the product of fraction unbound of drug in plasma (fu), corresponding mid-time plasma concentration of drug (Cmid), and duration of dialysate collection period (tm). CL HD = AHD/(fu\*Cmid\*tm).
Time frame: 1 to 2 hrs during hemodialysis started 4 hrs post-dose in Period 2
Dialyser Clearance (CL HD) From 2 to 3 Hour
Dialyser clearance was calculated as amount of drug in dialysate collected over a period of time (AHD) divided by the product of fraction unbound of drug in plasma (fu), corresponding mid-time plasma concentration of drug (Cmid), and duration of dialysate collection period (tm). CL HD = AHD/(fu\*Cmid\*tm).
Time frame: 2 to 3 hrs during hemodialysis started 4 hrs post-dose in Period 2
Dialyser Clearance (CL HD) From 3 to 4 Hour
Dialyser clearance was calculated as amount of drug in dialysate collected over a period of time (AHD) divided by the product of fraction unbound of drug in plasma (fu), corresponding mid-time plasma concentration of drug (Cmid), and duration of dialysate collection period (tm). CL HD = AHD/(fu\*Cmid\*tm).
Time frame: 3 to 4 hrs during hemodialysis started 4 hrs post-dose in Period 2
Fraction of Unbound Drug (fu)
Fraction of unbound drug (fu) is defined as the ratio of unbound drug concentration to the total drug concentration.
Time frame: 2 hours post-dose in Period 1