CDN Water Treatment and Dialysis Equipment

Question 1

What is the primary purpose of reverse osmosis (RO) in the dialysis water treatment system?

Accepted Answer

Remove dissolved ionic contaminants including heavy metals

Answer

Reverse osmosis removes dissolved ionic contaminants such as aluminum, fluoride, and heavy metals by forcing water through a semi-permeable membrane under pressure.

Question 2

Which chemical contaminant in municipal water poses the greatest risk of hemolytic anemia in dialysis patients if not removed?

Accepted Answer

Chloramine

Answer

Chloramine, used in municipal water disinfection, causes oxidative hemolytic anemia if not adequately removed before dialysis water reaches the patient.

Question 3

What is the AAMI recommended maximum level for bacteria in dialysis water?

Accepted Answer

100 CFU/mL

Answer

AAMI standards specify that dialysis water should contain no more than 100 colony-forming units per milliliter (CFU/mL) of bacteria.

Question 4

What happens to the water softener resin during the regeneration process?

Accepted Answer

Sodium ions replace accumulated calcium and magnesium ions via a salt brine flush

Answer

During regeneration, a concentrated sodium chloride (brine) solution flushes through the resin, replacing accumulated calcium and magnesium with sodium ions, restoring softening capacity.

Question 5

How often should the total chlorine level in dialysis water be tested at minimum?

Accepted Answer

Daily before each patient treatment

Answer

Total chlorine must be tested daily before each patient treatment shift, as breakthrough can occur rapidly and cause patient harm if not detected promptly.

CDN - Certified Dialysis Nurse Practice Test

CDN - Certified Dialysis Nurse Practice Test

CDN Water Treatment and Dialysis Equipment