Urea in Dialysate If the dailyzing fluid enters at a rate of 1500.0 mL/min and the exiting solution (dialysate) leaves at approximately the same rate, calculate the concentration of urea in the dialysate. i mg/mL Water and Urea Removal What is the rate at which water is removed from the blood (essentially the rate at which the volume of blood is reduced)? i mL/min What is the rate at which urea is removed from the blood? i mg/min Time Required Suppose we want to reduce the patient's urea level from an initial value of 2.80 mg/mL to a final value of 1.10 mg/mL. It the total blood volume is 5.00 liters and the average rate of urea removal is that calculated in Part (a), how long must the patient be dialyzed? You may assume a constant blood volume.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
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Urea in Dialysate
If the dailyzing fluid enters at a rate of 1500.0 mL/min and the exiting solution (dialysate) leaves at approximately the same rate,
calculate the concentration of urea in the dialysate.
i
mg/mL
Water and Urea Removal
What is the rate at which water is removed from the blood (essentially the rate at which the volume of blood is reduced)?
i
mL/min
What is the rate at which urea is removed from the blood? i
mg/min
Time Required
Suppose we want to reduce the patient's urea level from an initial value of 2.80 mg/mL to a final value of 1.10 mg/mL. It the total
blood volume is 5.00 liters and the average rate of urea removal is that calculated in Part (a), how long must the patient be
dialyzed? You may assume a constant blood volume.
i
min
Transcribed Image Text:Urea in Dialysate If the dailyzing fluid enters at a rate of 1500.0 mL/min and the exiting solution (dialysate) leaves at approximately the same rate, calculate the concentration of urea in the dialysate. i mg/mL Water and Urea Removal What is the rate at which water is removed from the blood (essentially the rate at which the volume of blood is reduced)? i mL/min What is the rate at which urea is removed from the blood? i mg/min Time Required Suppose we want to reduce the patient's urea level from an initial value of 2.80 mg/mL to a final value of 1.10 mg/mL. It the total blood volume is 5.00 liters and the average rate of urea removal is that calculated in Part (a), how long must the patient be dialyzed? You may assume a constant blood volume. i min
An artificial kidney is a device that removes water and waste metabolites from blood. In one such device, the hollow fiber
hemodialyzer, blood flows from an artery through the insides of a bundle of hollow cellulose acetate fibers, and dialyzing fluid, which
consists of water and various dissolved salts, flows on the outside of the fibers.
Water and waste metabolites-principally urea, creatinine, uric acid, and phosphate ions-pass through the fiber walls into the
dialyzing fluid, and the purified blood is returned to a vein.
Dialyzing fluid
Blood
from an
Purified
artery
blood to
a vein
Dialysate
At some time during a dialysis the arterial and venous blood conditions are as follows:
Arterial (entering) Blood Venous (exiting) Blood
Flow Rate
201.6 mL/min
195.6 mL/min
Urea (H2NCONH2)
1.90 mg/mL
1.80 mg/mL
Concentration
Transcribed Image Text:An artificial kidney is a device that removes water and waste metabolites from blood. In one such device, the hollow fiber hemodialyzer, blood flows from an artery through the insides of a bundle of hollow cellulose acetate fibers, and dialyzing fluid, which consists of water and various dissolved salts, flows on the outside of the fibers. Water and waste metabolites-principally urea, creatinine, uric acid, and phosphate ions-pass through the fiber walls into the dialyzing fluid, and the purified blood is returned to a vein. Dialyzing fluid Blood from an Purified artery blood to a vein Dialysate At some time during a dialysis the arterial and venous blood conditions are as follows: Arterial (entering) Blood Venous (exiting) Blood Flow Rate 201.6 mL/min 195.6 mL/min Urea (H2NCONH2) 1.90 mg/mL 1.80 mg/mL Concentration
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