CCHT Quality Control 2 — Questions and Answers
Question 1: What is the purpose of conducting monthly water quality testing in a hemodialysis facility?
- To determine water billing costs
- To ensure treated water meets AAMI chemical and microbiological standards and prevent patient harm from contaminated dialysate (Correct answer)
- To test for heavy metals only once per year
- To verify municipal water supply compliance
Correct answer: To ensure treated water meets AAMI chemical and microbiological standards and prevent patient harm from contaminated dialysate
Monthly water quality testing ensures the water treatment system is functioning correctly and that dialysate water meets AAMI standards, protecting patients from chemical and microbiological contamination.
Dialysis patients are exposed to 150 to 500 liters of water per week (via dialysate). AAMI/ANSI standards (RD52) require: bacteria less than 200 CFU/mL, endotoxin less than 2 EU/mL (action level: 1 EU/mL for ultrapure), and regulated chemical contaminants below maximum allowable levels. Monthly microbiological testing is required; more frequent testing after system changes or maintenance.
Question 2: What does the term residual chloramine testing refer to and why must it be performed before every dialysis run?
- Testing for chemical residue left by dialyzer reprocessing agents
- Testing for chloramines remaining in dialysate water that could cause hemolysis if present above 0.1 mg/L (Correct answer)
- Testing for calcium and magnesium residue from previous sessions
- Testing for residual heparin in the blood lines
Correct answer: Testing for chloramines remaining in dialysate water that could cause hemolysis if present above 0.1 mg/L
Chloramines are added to municipal water for disinfection and can cause life-threatening hemolysis if not completely removed; testing before each run confirms adequate removal.
Municipalities add chlorine and chloramine to water for microbial control. Chloramines are not removed by standard filtration and must be eliminated by activated carbon filters before water enters the RO system. Residual chloramine above 0.1 mg/L in dialysis water causes hemolysis in patients. Testing (typically with chloramine test strips before each run) must be documented. If chloramine is detected, the water treatment system must be repaired before treating any patients.
Question 3: In dialyzer reprocessing, what does the fiber bundle volume (FBV) test assess and what is the minimum acceptable result?
- The amount of sterilant remaining in the dialyzer after processing
- The volume of the hollow fiber compartment, with a minimum of 80% of original volume required for reuse (Correct answer)
- The number of times a dialyzer has been reprocessed
- The membrane permeability for large molecules
Correct answer: The volume of the hollow fiber compartment, with a minimum of 80% of original volume required for reuse
FBV measures remaining functional membrane surface area; dialyzers must retain 80% or more of original priming volume to ensure adequate solute clearance.
FBV (fiber bundle volume) is measured by filling the blood compartment with water and measuring the volume. This reflects the number of patent (open) hollow fibers. AAMI standards require minimum 80% of original FBV for continued reuse. For example, if original FBV is 100 mL, the minimum for reuse is 80 mL. A dialyzer failing this test must be discarded. The test is performed after cleaning but before sterilization, and results are documented on the dialyzer label.
Question 4: What is the significance of dialysis adequacy targets (Kt/V 1.4 or greater) from a quality perspective, and how does this metric drive facility performance?
- Kt/V is a billing metric only and has no clinical significance
- Kt/V measures dialysis dose delivery; facilities must achieve 1.4 or greater for 65% or more of patients as a CMS performance standard (Correct answer)
- Kt/V is measured only for research purposes
- Facilities must achieve Kt/V of 2.0 or greater for all patients
Correct answer: Kt/V measures dialysis dose delivery; facilities must achieve 1.4 or greater for 65% or more of patients as a CMS performance standard
CMS requires dialysis facilities to achieve Kt/V 1.4 or greater in at least 65% of patients as a quality performance standard that affects facility payment and surveys.
CMS ESRD Quality Incentive Program (QIP) includes dialysis adequacy as a performance measure. The clinical minimum is Kt/V 1.2 or greater, but the target is 1.4 or greater. Facilities must achieve this in 65% or more of patients or face payment reductions. Monthly Kt/V calculations are performed from pre- and post-dialysis BUN samples. Facility-level data is publicly reported on Dialysis Facility Compare.
Question 5: What action is required when a hemodialysis machine fails its required disinfection process verification test?
- Continue using the machine for stable patients only
- Take the machine out of service immediately, notify biomedical engineering, and document the failure (Correct answer)
- Repeat the disinfection cycle once and proceed if the repeat passes
- Use the machine for the next session and schedule maintenance for the following day
Correct answer: Take the machine out of service immediately, notify biomedical engineering, and document the failure
A failed disinfection verification means the machine may harbor live pathogens; it must be immediately removed from service until repaired and re-verified.
Machine disinfection verification confirms that the machine's fluid pathways are safe for the next patient. A failed test means biofilm, bacteria, or inadequate chemical contact occurred. Actions: (1) Immediately take machine out of service (tag OUT OF SERVICE), (2) Notify charge nurse and biomedical engineering, (3) Document failure in maintenance log, (4) Investigate cause (sensor failure, heater malfunction, disinfectant issue), (5) Machine cannot return to service until problem is corrected and verification passes.
Question 6: What is the purpose of a root cause analysis (RCA) following a serious patient safety event in a dialysis unit?
- To identify and punish the staff member responsible
- To systematically identify contributing factors and implement system-level changes to prevent recurrence (Correct answer)
- To satisfy insurance requirements for documentation only
- To determine if the facility needs additional staff
Correct answer: To systematically identify contributing factors and implement system-level changes to prevent recurrence
RCA uses a non-punitive, systems-thinking approach to identify all contributing factors (not just individual errors) and implement preventive system changes.
Root cause analysis (RCA) is a structured quality improvement tool used after near-misses, sentinel events, or serious adverse events. It identifies: (1) What happened, (2) Why it happened (immediate causes and contributing factors including workload, training gaps, equipment, protocol deficiencies, communication failures), (3) What needs to change systemically. Outcomes: process changes, protocol updates, equipment modifications, training programs. CMS requires facilities to have quality assessment and performance improvement (QAPI) programs that use RCA for serious events.
CCHT Quality Control 2
What is the purpose of conducting monthly water quality testing in a hemodialysis facility?