DaVita PCT Clinical Exam
Diffusion - Correct answer-movement of dissolved PARTICLES across a
semipermeable membrane from the side of HIGHER concentration TO side of LOWER
concentration (across concentration gradient).
at equilibrium, no net transport takes place & dialysis fluid needs to be exchanged.
ultrafiltration - Correct answer-removes water from the blood by PUSHING it across the
semipermeable membrane from the blood side within the dialyzer's hollow fibers to the
dialysate side; pressure is added to the dialyzer to get the fluid out.
TMP - Correct answer-transmembrane pressure; pressure in dialyzer. (+ TMP can show
a clot).
osmosis - Correct answer-movement of WATER across a semipermeable membrane
from the side of LOWER solute concentration to the side with the HIGHER solute
concentration, until equilibrium is reached.
osmotic pressure gradients drive ultrafiltration.
when drawing the post-BUN sample at the completion of the treatment... - Correct
answer-1) turn off the UFR
2) decrease the dialysate flow rate to 300 ml/min or place the machine in bypass
3) reduce BFR to 50 ml/min
4) then wait 15 seconds
5) draw the BUN blood sample from arterial sample port (venous port can give falsely
low readings).
the post-BUN blood sample is related to the patient's _____ reading - Correct answer-
Kt/V
two possible causes in inaccurate Kt/V results include: - Correct answer-1) blood
sample was drawn before correct time interval and access recirculation makes the Kt/V
falsely high.
2) blood sample was drawn after correct time interval was completed, urea rebound
makes the Kt/V falsely low.
optimal dialysate temperature - Correct answer-36.6
maximum recirculation time after a machine has been set up prior to tx cannot exceed: -
Correct answer-2 hours
why do limit recirculation time? - Correct answer-limiting bacterial growth in machine
Diffusion - Correct answer-movement of dissolved PARTICLES across a
semipermeable membrane from the side of HIGHER concentration TO side of LOWER
concentration (across concentration gradient).
at equilibrium, no net transport takes place & dialysis fluid needs to be exchanged.
ultrafiltration - Correct answer-removes water from the blood by PUSHING it across the
semipermeable membrane from the blood side within the dialyzer's hollow fibers to the
dialysate side; pressure is added to the dialyzer to get the fluid out.
TMP - Correct answer-transmembrane pressure; pressure in dialyzer. (+ TMP can show
a clot).
osmosis - Correct answer-movement of WATER across a semipermeable membrane
from the side of LOWER solute concentration to the side with the HIGHER solute
concentration, until equilibrium is reached.
osmotic pressure gradients drive ultrafiltration.
when drawing the post-BUN sample at the completion of the treatment... - Correct
answer-1) turn off the UFR
2) decrease the dialysate flow rate to 300 ml/min or place the machine in bypass
3) reduce BFR to 50 ml/min
4) then wait 15 seconds
5) draw the BUN blood sample from arterial sample port (venous port can give falsely
low readings).
the post-BUN blood sample is related to the patient's _____ reading - Correct answer-
Kt/V
two possible causes in inaccurate Kt/V results include: - Correct answer-1) blood
sample was drawn before correct time interval and access recirculation makes the Kt/V
falsely high.
2) blood sample was drawn after correct time interval was completed, urea rebound
makes the Kt/V falsely low.
optimal dialysate temperature - Correct answer-36.6
maximum recirculation time after a machine has been set up prior to tx cannot exceed: -
Correct answer-2 hours
why do limit recirculation time? - Correct answer-limiting bacterial growth in machine
