Hemodialysis Initiation and Management
Initiate hemodialysis based on uremic symptoms, protein-energy wasting, or inability to manage metabolic abnormalities—not on a specific GFR threshold—and prioritize arteriovenous fistula creation early with a comprehensive patient-centered access plan. 1
Timing of Hemodialysis Initiation
Start dialysis based on clinical indicators rather than arbitrary kidney function numbers. The decision should be driven by uremic symptoms (nausea, vomiting, altered mental status, pericarditis), evidence of protein-energy wasting, or inability to safely manage volume overload, hyperkalemia, metabolic acidosis, or hyperphosphatemia with medical therapy alone. 1
Moderate-quality evidence confirms that early initiation (at estimated creatinine clearance 10-14 mL/min) provides no mortality benefit compared to later initiation (5-7 mL/min), so avoid rushing patients onto dialysis prematurely. 2
Begin patient education at CKD stage 4 (GFR <30 mL/min/1.73 m²) about all kidney replacement options: transplantation, peritoneal dialysis, home hemodialysis, in-center hemodialysis, and conservative management. Include family members and caregivers in these discussions. 1
Vascular Access Strategy
The P-L-A-N Approach
Implement a structured P-L-A-N framework: Patient ESKD Life-Plan first, then Access Needs. 3 This includes:
- Vessel preservation plan: Avoid peripheral IVs and blood draws in non-dominant arm veins; avoid subclavian vein catheterization (causes central venous stenosis) 4
- Creation plan: Timing and type of access based on individual patient factors
- Contingency plan: Management of complications
- Access succession plan: Future access options as circumstances change
Access Type Selection
Prioritize arteriovenous fistula (AVF) as first choice for most patients, but individualize based on patient life expectancy, comorbidities, vessel quality, and personal preferences. 5, 3 The outdated "fistula-first for everyone" approach has been replaced by patient-centered decision-making. 4
Preferred access hierarchy:
- Radiocephalic (Brescia-Cimino) fistula at wrist - lowest complication rate
- Brachiocephalic fistula at elbow - if wrist vessels inadequate
- Arteriovenous graft (AVG) - for poor vessel quality, elderly patients, or those needing faster access maturation
- Tunneled central venous catheter - temporary bridge or when AV access impossible
Plan access creation when GFR approaches 20 mL/min/1.73 m² to allow 3-6 months for fistula maturation before dialysis need. 5 Fistulas require this time to develop adequate flow and vessel diameter for successful cannulation.
Central Venous Catheters
When catheters are necessary:
- Use internal jugular vein as insertion site - right side preferred over left 5, 4
- Avoid subclavian vein - high risk of central venous stenosis that compromises future access options 4
- Femoral catheters - only for temporary use due to infection and thrombosis risk
Hemodialysis Prescription Parameters
Standard Thrice-Weekly Hemodialysis
Target single-pool Kt/V of 1.4 per session with minimum delivered dose of 1.2. 1 This represents adequate small solute clearance for most patients.
Prescribe minimum 3 hours per treatment session for patients with residual kidney function <2 mL/min. 1 However, this bare minimum is often insufficient.
Consider longer treatment times or additional sessions for patients with:
- Large interdialytic weight gains
- High ultrafiltration rates (>10-13 mL/kg/hour increases mortality risk)
- Poorly controlled hypertension
- Difficulty achieving dry weight
- Hyperphosphatemia, metabolic acidosis, or hyperkalemia 1
Alternative Hemodialysis Schedules
Short frequent hemodialysis (5-6 times weekly, 2-3 hours): May improve blood pressure control and quality of life but increases vascular access procedures and hypotension risk. Offer as alternative after discussing risks. 1, 2
Long frequent hemodialysis (6-8 hours, 3-6 nights weekly): Consider for lifestyle preferences, particularly home dialysis patients. Warn about increased access complications, caregiver burden, and accelerated loss of residual kidney function. 1
For non-thrice-weekly schedules, target standard Kt/V of 2.3 volumes/week with minimum 2.1, including contributions from ultrafiltration and residual kidney function. 1
Volume and Blood Pressure Management
Combine dietary sodium restriction with adequate sodium/water removal during dialysis to control hypertension, volume overload, and left ventricular hypertrophy. 1 Prescribe individualized ultrafiltration rates for each session, keeping rates as low as feasible by extending treatment time when needed.
Anticoagulation During Hemodialysis
Standard Approach
Use unfractionated heparin (UFH) as first-line anticoagulation - most cost-effective and widely available. 6 Typical dosing: loading dose 1000-5000 units, then continuous infusion 500-2000 units/hour, adjusted based on circuit clotting.
Low-molecular-weight heparin (LMWH) is equally effective for circuit patency and may be preferred for convenience (single bolus dosing). 6 However, accumulation risk exists in dialysis patients.
High Bleeding Risk Patients
Regional citrate anticoagulation (RCA) or nafamostat for patients at high bleeding risk - lower bleeding rates than systemic heparin. 6 RCA requires careful monitoring of ionized calcium and acid-base status.
Heparin-free dialysis with frequent saline flushes - reserve for active bleeding situations, though increases circuit clotting risk.
Monitoring Anticoagulation
Routine laboratory monitoring of anticoagulation is NOT indicated for most hemodialysis patients. 7 Use semiquantitative visual clotting scores of dialyzer and venous chamber to guide dose adjustments.
Consider laboratory monitoring only in select cases:
- Extremes of body weight
- Repeated circuit clotting despite dose adjustments
- Recurrent bleeding complications
- Uncertain anticoagulant effect 7
When monitoring is needed: activated partial thromboplastin time (aPTT) or activated clotting time (ACT) for UFH; anti-factor Xa assay for LMWH. Target ranges are not clearly defined but aPTT 1.5-2.5 times baseline is commonly used.
Laboratory Monitoring
Dialysis Adequacy
Measure Kt/V monthly to ensure adequate dialysis delivery. Single-pool Kt/V can be calculated from pre- and post-dialysis BUN, treatment time, and ultrafiltration volume. 1
Measure residual kidney function (urine collection for creatinine clearance) every 2-3 months in patients with significant urine output to adjust dialysis prescription appropriately. 1
Routine Monitoring
Standard monthly labs should include:
- Pre-dialysis BUN, creatinine, electrolytes
- Calcium, phosphorus, intact PTH (monthly to quarterly)
- Hemoglobin, iron studies
- Albumin (nutritional status)
Vascular Access Monitoring and Complications
Arteriovenous Access Surveillance
Monitor for clinical signs of access dysfunction:
- Difficulty with cannulation
- Prolonged bleeding after needle removal (>20 minutes)
- Decreased thrill or altered bruit
- Arm swelling
- Elevated venous pressures during dialysis
- Recirculation or inadequate blood flow rates 5
Physical examination is the primary surveillance method. 5 Routine access flow measurements or Doppler ultrasound may supplement clinical monitoring but should not replace it.
Common Complications Requiring Intervention
Stenosis and thrombosis are the most frequent AV access problems. Intervene with angioplasty or surgical revision when clinically significant lesions cause symptoms or sustained measurement changes. 5
Access infection: Treat with appropriate antibiotics; may require access removal if severe or associated with bacteremia.
Steal syndrome (hand ischemia): Presents with pain, coldness, or tissue loss in hand during or after dialysis. Requires urgent vascular surgery evaluation for access revision or ligation. 3, 8
High-output cardiac failure: Rare but life-threatening complication of high-flow fistulas (>2 L/min). Suspect in patients with new or worsening heart failure. May require access flow reduction or ligation. 3, 8
Aneurysmal degeneration: Common in mature fistulas. Monitor for skin thinning, rapid expansion, or rupture risk. Avoid cannulating aneurysmal areas. 8
Access rupture: Medical emergency requiring immediate pressure, possible transfusion, and surgical repair. 3
Catheter-Specific Complications
Catheter dysfunction (poor flow): Attempt thrombolytic therapy (alteplase) before catheter exchange. Check for catheter malposition or fibrin sheath. 4
Catheter-related bloodstream infection: Most serious catheter complication. Remove catheter if tunnel infection, sepsis, endocarditis, or persistent bacteremia despite antibiotics. 4
Central venous stenosis: Long-term complication of catheter use affecting future access options. Suspect with arm swelling, prominent collateral veins, or catheter dysfunction. Requires venography for diagnosis. 4
Cannulation Best Practices
Use rope-ladder technique - rotate needle sites along entire cannulation segment to prevent aneurysm formation and preserve access longevity. 5, 4
Avoid buttonhole technique in most patients due to increased infection risk, unless specific indications exist (difficult cannulation, patient preference with proper training). 4
Arterial and venous needles should be separated by at least 4-5 cm to minimize recirculation. 5
Key Pitfalls to Avoid
- Starting dialysis too early based solely on GFR - wait for clinical indications
- Subclavian vein catheterization - causes central venous stenosis
- Delaying fistula creation - start planning at GFR 20-25 mL/min
- Routine laboratory monitoring of heparin - unnecessary and not evidence-based
- Inadequate treatment time - extending time is better than increasing ultrafiltration rate
- Ignoring residual kidney function - can allow reduced dialysis intensity
- Buttonhole cannulation without proper training - increases infection risk
- Missing steal syndrome or high-output heart failure - potentially life-threatening