Before We Start
CKD is defined and staged by GFR
Chronic kidney disease is defined as a GFR (glomerular filtration rate) under 60 mL/min/1.73m² for 3 months or longer, or evidence of kidney damage regardless of GFR. Staging tracks the decline:
| Stage | GFR | Description |
|---|
| 1 | ≥90 | Normal/high GFR, but kidney damage present |
| 2 | 60–89 | Mild reduction, with kidney damage |
| 3 | 30–59 | Moderate reduction |
| 4 | 15–29 | Severe reduction — preparation for dialysis/transplant begins |
| 5 (ESRD) | <15 | Kidney failure — dialysis or transplant needed |
💡 Memory Trick — Why Stage 4 Matters So Much
Stage 4 is when nephrology referral, patient education about dialysis options, and AV fistula placement should happen, well BEFORE stage 5/dialysis is actually needed. A fistula takes at least 6 weeks, often 3 months or more, to mature before it can even be used. Waiting until a patient is in kidney failure to start this process means falling back on a temporary, higher-infection-risk central venous catheter instead.
Hemodialysis
The AV fistula — protecting the lifeline
Assessing patency — every shift
Palpate for a thrill (a vibrating sensation) and auscultate for a bruit (a whooshing sound) over the fistula. Both confirm the fistula is open and functioning. Absence of either is an emergency, it likely means the fistula has clotted and needs immediate provider notification.
What NEVER happens in that arm
No blood pressure readings, no venipuncture, no IV starts, and no constricting jewelry or tight clothing on the fistula arm. Any of these can damage or clot the access that the patient depends on for survival.
💊 If an AV fistula is in the left arm, blood pressure is taken on the right, every time, no exceptions.
Dialysis disequilibrium syndrome
Rapid removal of urea and fluid, especially during a patient's first few dialysis sessions, can cause a fluid shift into brain tissue faster than the brain can adjust. Signs: headache, nausea/vomiting, confusion, decreasing level of consciousness, twitching, and in severe cases, seizures. Newer patients are often started on shorter, more frequent sessions specifically to prevent this.
Peritoneal Dialysis
Using the patient's own peritoneal membrane as the filter
The process
Dialysate is instilled into the peritoneal cavity through a catheter, dwells for a period of time while waste and excess fluid move across the peritoneal membrane, then is drained out. This can be done at home, giving patients more independence than hemodialysis, but it also puts more responsibility on the patient to maintain sterile technique.
Peritonitis — the major complication
Caused by contamination of the catheter or connections during exchanges. The hallmark sign is cloudy dialysate outflow, along with abdominal pain and fever. This requires meticulous aseptic technique to prevent, and prompt treatment (typically intraperitoneal antibiotics) if it occurs.
💊 Cloudy effluent in a peritoneal dialysis patient is peritonitis until proven otherwise. This is one of the most consistently tested facts in this topic.
Diet in CKD
Restrictions shift depending on dialysis status
Before dialysis, a lower-protein diet is often recommended to reduce the workload on remaining kidney function. Once a patient starts dialysis, protein needs actually increase, since dialysis itself removes protein and amino acids, and malnutrition becomes a real risk. Fluid, sodium, potassium, and phosphorus restrictions generally continue throughout, since the kidneys can no longer regulate these effectively.
🏥 CKD & Dialysis Scenarios — Apply What You've Learned
Three scenarios. Identify the correct nursing action.
1
Scenario: A nurse needs to draw blood and start an IV on a patient with an AV fistula in the right arm, and there's no obvious vein visible in the left arm.
Correct action: Find another site, or ask another team member to help locate access elsewhere. The fistula arm cannot be used for venipuncture, IV starts, or blood pressure, regardless of convenience.
2
Scenario: A patient on peritoneal dialysis calls reporting their dialysate outflow looks cloudy, along with mild abdominal discomfort.
Correct action: This is peritonitis until proven otherwise. The patient should be assessed promptly and this should be reported to the provider, likely requiring a sample sent for cell count/culture and antibiotic treatment.
3
Scenario: A patient beginning their first hemodialysis session develops a headache, nausea, and appears increasingly confused partway through treatment.
Correct action: Suspect dialysis disequilibrium syndrome. Notify the provider, the dialysis rate may need to be slowed or the session stopped early.
📌 NCLEX Application
NCLEX tests AV fistula precautions and recognition of dialysis complications heavily.
Rules to know cold:
• Never take blood pressure, draw blood, or start an IV in an AV fistula arm
• Assess fistula patency by palpating for a thrill and auscultating for a bruit, every shift
• Cloudy peritoneal dialysate effluent = suspected peritonitis
• Dialysis disequilibrium syndrome presents with headache, confusion, and possible seizures, especially in new dialysis patients
• CKD stage 4 (GFR 15-29) is when dialysis access planning should begin, before it's actually needed
• Protein needs increase once dialysis starts, they don't stay restricted the same way as pre-dialysis
Common NCLEX trap: a question describes a nurse taking a blood pressure in the arm with the AV fistula "because the other arm has an IV." This is always the wrong answer, another location or method must be used.
⚠️ The Trap — Treating the Fistula Arm as "Just Another Arm" Under Pressure
Under time pressure, especially with limited IV access elsewhere, it's tempting to rationalize "just this once" use of the fistula arm for a blood pressure or blood draw. This is never acceptable, even in a genuine emergency, damage to the fistula can mean losing the patient's only reliable dialysis access, sometimes permanently.
The correct response to limited access elsewhere is to seek help, use an alternate site (even a less convenient one), or escalate for assistance, not to compromise the fistula.
NCLEX angle: "The nurse is unable to locate a vein for blood draw except in the arm with the patient's AV fistula. What is the nurse's best action?" → Request assistance from another nurse or provider to locate alternate access. Using the fistula arm is never the correct answer, regardless of the difficulty.
✓ Quick Self-Test
Answer before checking:
1. What GFR range and duration defines chronic kidney disease?
2. Why should dialysis access planning begin at CKD stage 4, before stage 5?
3. What two assessment findings confirm AV fistula patency?
4. What is the hallmark sign of peritonitis in a peritoneal dialysis patient?
5. What symptoms characterize dialysis disequilibrium syndrome, and who is most at risk?
Answers:
1. GFR under 60 mL/min/1.73m², or markers of kidney damage (e.g., albuminuria), for 3 months or longer.
2. An AV fistula takes at least 6 weeks, often 3 months or more, to mature before it can be used. Waiting until stage 5/dialysis is needed means relying on a temporary, higher-infection-risk catheter in the meantime.
3. A palpable thrill and an audible bruit over the fistula site.
4. Cloudy dialysate outflow, along with abdominal pain and fever.
5. Headache, nausea/vomiting, confusion, decreasing level of consciousness, twitching, and possible seizures — most common in patients new to dialysis, due to rapid fluid/urea shifts.
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