Dialysis Equipment Maintenance and Troubleshooting Flashcards
6 cards from real CHBT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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What is the purpose of performing a pressure hold test on a dialysis machine?
Answer: To verify the integrity of the internal fluid pathways and check for leaks
A pressure hold test pressurizes the hydraulic circuit and monitors for pressure decay, confirming there are no leaks in the machine's fluid pathways.
Which dialysis machine component separates the concentrate mixture from the patient's blood circuit?
Answer: Dialyzer membrane
The semi-permeable dialyzer membrane separates the blood and dialysate compartments, allowing solute diffusion while preventing direct fluid mixing.
A technician notices the bicarbonate concentrate port has crystalline buildup. What is the correct corrective action?
Answer: Clean the port with warm water per manufacturer protocol to remove bicarbonate precipitate
Bicarbonate precipitate should be removed by cleaning the port with warm water as directed by the manufacturer, since buildup can affect flow and contaminate the system.
What does volumetric ultrafiltration control offer compared to pressure-based control?
Answer: More accurate fluid removal by directly measuring volume rather than relying on pressure calculations
Volumetric UF control measures actual fluid volumes removed, eliminating errors caused by pressure variations and providing more precise fluid balance.
During preventive maintenance, a technician finds the blood pump roller is worn. What is the risk if treatment continues?
Answer: Inaccurate blood flow delivery and potential hemolysis from excessive tubing compression
Worn rollers can cause inconsistent occlusion of the blood tubing, resulting in inaccurate flow rates and mechanical trauma to red blood cells.
What is the role of the deaeration chamber in a hemodialysis machine?
Answer: Removes dissolved gases from dialysate before it enters the dialyzer
The deaeration chamber uses a vacuum or heat to remove dissolved gases from dialysate, preventing bubble formation inside the dialyzer that could affect performance.
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