Free CCHT Technical and Environment Test 3

Question 1

What determines the surface area of a hollow fiber dialyzer?

Accepted Answer

All of the above

Answer

The total surface area of a hollow fiber dialyzer, crucial for efficient solute and fluid exchange, is determined by the collective dimensions of its fibers. A greater number of fibers, along with their individual length and internal diameter, directly contributes to a larger overall membrane surface area available for diffusion and ultrafiltration.

Question 2

The purpose of using counter-current flow is to:

Accepted Answer

increase the rate of waste removal

Answer

Counter-current flow in a dialyzer involves blood and dialysate flowing in opposite directions. This arrangement maintains a maximal concentration gradient across the entire length of the membrane. This continuous gradient optimizes the efficiency of diffusion, significantly increasing the rate at which waste products are removed from the patient's blood.

Question 3

Chloramine exposure in dialysis can result in:

Accepted Answer

hemolysis

Answer

Chloramines, used as disinfectants in tap water, must be completely removed from dialysis water. If chloramines enter the patient's bloodstream, they cause oxidative damage to red blood cells, leading to hemolysis. This rupture of red blood cells can result in severe anemia and other serious complications for the patient.

Question 4

Part of the reuse process involves the reuse machine testing the dialyzer to verify:

Accepted Answer

the dialyzer fibers are free of leaks

Answer

During the dialyzer reuse process, a critical safety check performed by the reuse machine is to verify the integrity of the dialyzer fibers. This test ensures that there are no leaks in the membrane, preventing the mixing of blood and dialysate. Maintaining fiber integrity is essential for patient safety and the continued effectiveness of the dialyzer.

Question 5

According to AAMI RD52, what is the maximum allowable level of bacteria in dialysate?

Accepted Answer

200 CFU's

Answer

According to the Association for the Advancement of Medical Instrumentation (AAMI) RD52 standards, the maximum allowable level of bacteria in dialysate is 200 Colony Forming Units (CFU's) per milliliter. Adhering to this standard is vital to minimize the risk of bacterial contamination and prevent infections or pyrogenic reactions in hemodialysis patients.

CCHT - Certified Clinical Hemodialysis Technician Practice Test

CCHT - Certified Clinical Hemodialysis Technician Practice Test

Free CCHT Technical and Environment Test 3