Dialysis Catheter (Hemodialysis Vascular Access) 

A dialysis catheter is a double-lumen or triple-lumen large-bore central venous catheter .


Types of Dialysis Catheters

Non-Tunneled Dialysis Catheter (NTDC)

Temporary catheter.

Use:ICU/AKI—Emergency dialysis

Duration:Days to weeks


Tunneled Dialysis Catheter (TDC)

  • Permcath
  • Hickman-type dialysis catheters

Duration:Months to years

Features:Dacron cuff/Subcutaneous tunnel

Less infection risk.


Tip Placed in:Right atrium/Cavoatrial junction for IJV

For femoral dialysis catheters:

—Right Femoral

Tip ideally in:Inferior vena cava (IVC)

orIVC-right atrial junction (long catheters)


—Left Femoral Tip ideally in: IVC above iliac vein confluence

Because left-sided catheters have a longer and more tortuous course.


Catheter Sizes

Adult Temporary Catheters

Site

Length

Right IJV

13–16 cm

Left IJV

15–20 cm

Femoral

20–30 cm

Left Femoral

24–30 cm

Diameter Usually: Most ICU catheters: 12–13 Fr


Preferred Insertion Sites

Rank

Site

1

Right IJV

2

Femoral

3

Left IJV

4

Subclavian (avoid)

1. Right Internal Jugular Vein

First choice.

Advantages:

  • Straight path to SVC
  • Lowest dysfunction
  • Lowest recirculation
  • Easy ultrasound guidance

Recommended by:

  • KDIGO
  • KDOQI


2. Femoral Vein

Second choice.

Useful when:

  • Coagulopathy
  • Mechanical ventilation
  • Cervical immobilization

Advantages:

  • Easy insertion
  • No pneumothorax

Disadvantages:

  • Infection risk
  • Thrombosis
  • Mobilization difficulty


3. Left Internal Jugular Vein

Acceptable.

Problems:

  • Longer course
  • More dysfunction


4. Subclavian Vein

Generally avoided.

Reason:

High risk of:

  • Central venous stenosis
  • Future AV fistula compromise

Not preferred in CKD patients.


Contraindications

Contraindication Type

Details

Absolute Contraindications

No truly absolute contraindication exists when dialysis is immediately life-saving (e.g., severe hyperkalemia, pulmonary edema, severe acidosis, uremic complications). Risks may need to be accepted if dialysis is urgently required.

Local Infection at Proposed Insertion Site

Cellulitis, infected wounds, burns, abscess, or extensive skin breakdown over the planned insertion site. Increased risk of catheter colonization and catheter-related bloodstream infection (CRBSI). Choose an alternative site whenever possible.

Venous Thrombosis / Venous Occlusion

Known thrombosis or obstruction of the target vein such as internal jugular vein (IJV) thrombosis, subclavian vein thrombosis, brachiocephalic vein thrombosis, or superior vena cava (SVC) obstruction/SVC syndrome. Ultrasound or venography may be required to identify a patent vessel.

Severe Coagulopathy

Includes severe thrombocytopenia, markedly elevated INR, DIC, or therapeutic anticoagulation. Not an absolute contraindication. Ultrasound-guided insertion by an experienced operator is generally safe and often preferred over delaying life-saving dialysis. Correction of coagulopathy should be individualized based on bleeding risk and urgency.

Distorted Neck or Groin Anatomy

Previous surgery, radiation therapy, extensive scarring, large hematoma, tumors, or congenital vascular abnormalities may make cannulation technically difficult and increase complication risk.

Existing Central Venous Stenosis

Prior central venous catheterization, pacemaker leads, dialysis catheters, or previous thrombosis may cause stenosis and poor catheter function. Particularly important in patients expected to require long-term dialysis access.

Suspected Catheter-Related Bloodstream Infection at Existing Site

Existing infected catheter should not be exchanged over a guidewire. A new catheter should be inserted at a different site after appropriate evaluation and treatment.

Inability to Position Patient Safely

Severe agitation, inability to cooperate, uncontrolled movement, or inability to tolerate positioning may increase procedural risk and require sedation or alternative access planning.


Post-Insertion Confirmation

Internal Jugular/Subclavian

Chest X-ray required to evaluate:

  • Position
  • Pneumothorax
  • Hemothorax

Unlike internal jugular or subclavian dialysis catheters, routine chest X-ray is NOT required after femoral catheter insertion because there is no risk of pneumothorax or hemothorax.

Ultrasound

Can identify:

  • Pleural sliding
  • Pneumothorax
  • Guidewire location

Increasingly replacing routine CXR in experienced centers.


Catheter Lock Solutions

After dialysis, lumens are filled with lock solution.

Purpose:Prevent clotting—-Maintain patency


Heparin Lock

Traditional.

Common concentrations:

  • 1000 U/mL
  • 5000 U/mL


Citrate Lock

Increasingly preferred.

Advantages:

  • Lower bleeding
  • Lower thrombosis

Common concentrations:

  • 4%
  • 30–46.7% (specialized use)

Q. Does a dialysis catheter require daily heparin flushing like a standard CVC?

Answer: No.

A dialysis catheter should be filled with a lock solution equal to the lumen volume after each dialysis session or when not in use, rather than repeatedly flushed with heparin.


ACCORDING TO GUIDELINES WHEN TO CHANGE/REMOVE HD CATH

KDOQI 2019:
Non-cuffed, non-tunneled hemodialysis catheters should ideally be limited to ≤2 weeks of use due to increasing risks of catheter-related infection and complications. If dialysis is expected beyond this period, a tunneled cuffed dialysis catheter should be considered. Routine scheduled catheter exchange is not recommended. 


“Does KDOQI recommend routine change of HD catheter every 14 days?”

Answer: No. KDOQI recommends limiting non-tunneled catheter use to about 2 weeks, but does not recommend routine scheduled catheter exchange. The catheter should instead be removed when no longer needed, converted to tunneled access if long-term dialysis is expected, or removed earlier if infection or dysfunction develops. 



Dialysis Catheter Thrombosis: Guideline-Based Diagnosis and Management

(Based on KDOQI 2019, KDIGO AKI Guidelines, CDC vascular access recommendations, interventional nephrology literature, and critical care practice)


Type

Location

Intraluminal thrombosis

Inside catheter lumen

Mural thrombosis

Adjacent vessel wall

Fibrin sheath

Around catheter tip

Central venous thrombosis

IJV, brachiocephalic vein, SVC

Right atrial thrombus

Around catheter tip

Fibrin Sheath Formation

Classic finding: One-Way Valve Phenomenon.Can flush easily BUT Cannot aspirate blood


Diagnosis

Step 1: Exclude Mechanical Causes First

Guidelines emphasize that not all dysfunction is thrombosis.

Check:

  • Kinked tubing—Closed clamp—Incorrect line connection—Catheter malposition—Patient position

Bedside Maneuvers

Try:Turn head—Raise arm—Cough—Sit upright—Trendelenburg

If flow improves → likely positional issue.


Step 2: Suspect Thrombosis

Indicators:

✓ Poor blood flow

✓ Recurrent dialysis interruption

✓ Inability to aspirate

✓ Frequent CRRT alarms


Step 3: Imaging

Chest X-ray

Evaluate:

  • Tip position—Migration—Kinking

Not sensitive for thrombus.


Ultrasound

First-line for:

  • IJV thrombosis
  • Femoral thrombosis

Findings:

  • Non-compressible vein
  • Intraluminal clot
  • Absent Doppler flow

Contrast Venography

Gold standard for:

  • Fibrin sheath
  • Central venous thrombosis

Findings:Contrast exits through sheath around catheter rather than catheter tip.


CT Venography

Useful for:SVC thrombosis/Brachiocephalic thrombosis


Echocardiography

If:

  • Right atrial thrombus suspected
  • Persistent bacteremia
  • Catheter tip thrombus

Especially TEE.


Management Algorithm

Step 1

Exclude:

  • Mechanical causes
  • Malposition

Correct if present.


Step 2

Thrombolytic Lock Therapy

Guideline-preferred first treatment.


Alteplase (tPA)

Most commonly recommended.

Catheter Volume

Alteplase

Each lumen

2 mg/2 mL

Instill exactly lumen volume.


Technique

  1. Instill into lumen
  2. Leave for 30–120 minutes

Can dwell longer if needed.

  1. Aspirate
  2. Flush
  3. Reassess flow

Success Rate

Approximately:70–90% for intraluminal thrombosis.

If first attempt fails: Repeat once.


Guidewire Exchange(KDOQI Recommendation)

Acceptable when:

  • Dysfunction present
  • No infection
  • No bacteremia

Fibrin Sheath Management

Common cause of recurrent dysfunction.


Fibrin Sheath Disruption

Performed by interventional radiology.

Techniques:

  • Balloon disruption
  • Angioplasty

Catheter Exchange

Often performed simultaneously.


Prevention

Correct Tip Position

  • Cavoatrial junction
  • Right atrium

Adequate Lock Solution-Citrate or Heparin lock after each session.



Antibiotic Lock Therapy (ALT) for Dialysis Catheters 

(Based on Infectious Diseases Society of America CRBSI Guidelines, KDOQI 2019 Vascular Access Guidelines, CDC recommendations, and nephrology literature)


What Is Antibiotic Lock Therapy?

Antibiotic lock therapy (ALT) involves:

  • Filling the catheter lumen with a high-concentration antibiotic solution
  • Usually mixed with an anticoagulant (heparin or citrate)
  • Leaving it in the catheter lumen between dialysis sessions

The concentration used is often 100–1000 times higher than achievable serum levels.

Purpose:

  • Eradicate biofilm-associated bacteria
  • Salvage the catheter
  • Prevent relapse of infection

Why Is ALT Needed?

Once bacteria adhere to a catheter:

  1. Biofilm develops
  2. Antibiotics penetrate poorly
  3. Organisms become highly resistant

Systemic antibiotics alone may fail.

ALT delivers extremely high local concentrations directly to the biofilm.


Indications

Catheter Salvage Strategy

Used when:

  • Catheter-related bloodstream infection (CRBSI)
  • Hemodynamically stable patient
  • No tunnel infection
  • No exit-site abscess
  • No metastatic infection
  • Vascular access is difficult

ALT should never be used alone for CRBSI.

Systemic antibiotics are mandatory.


NOT Used For Routine prophylaxis.

Guidelines do not recommend routine antibiotic locks for every dialysis catheter because of:

  • Antibiotic resistance
  • Cost
  • Antimicrobial stewardship concerns

When Catheter Must Be Removed Instead

  • Septic Shock
  • Persistent Bacteremia (>48–72 h)
  • Tunnel Infection
  • Exit-Site Infection with Purulence
  • Endocarditis
  • Osteomyelitis
  • Septic Thrombosis
  • Fungal Infection
  • Persistent Fever Despite Therapy
  • Candida Species
  • Staphylococcus aureus

Organisms Where Salvage Is More Successful

  • Coagulase-Negative Staphylococci
  • Enterococcus
  • Gram-Negative Bacilli

How Is ALT Prepared?

General principle:Antibiotic + anticoagulant

Volume = exact catheter lumen volume

Usually:1.5–2.5 mL per lumen Depending on catheter.


Common Antibiotic Locks

Antibiotic Lock Solution

Organisms /Concentration

Vancomycin Lock

Most commonly used lock solution. Effective against MRSA and coagulase-negative staphylococci(e.g., Staphylococcus epidermidis). Typical concentration: Vancomycin 2–5 mg/mL, usually mixed with heparin or citrate.

Gentamicin Lock

Used primarily for Gram-negative organisms. Typical concentration: Gentamicin 1–5 mg/mL, usually combined with heparin or citrate.

Cefazolin Lock

Useful for methicillin-sensitive Staphylococcus aureus (MSSA) and other susceptible Gram-positive organisms. Often used when MSSA catheter salvage is attempted.

Ceftazidime Lock

Used for susceptible Gram-negative bacilli, including many Pseudomonas and Enterobacterales species. Usually combined with an anticoagulant lock solution.

Cefepime Lock

Alternative broad-spectrum lock solution for susceptible Gram-negative organisms, particularly when resistance patterns favor cefepime over ceftazidime.

Daptomycin Lock

Used for resistant Gram-positive infections, including MRSA and vancomycin-resistant Enterococcus (VRE) when catheter salvage is being considered. Often reserved for difficult or refractory infections.

Dwell Time

Guidelines generally recommend:Between dialysis sessions.

Usually:24–72 hoursdepending on dialysis schedule.

Example:Monday dialysis → lock remains until Wednesday session.


Duration of Therapy

Antibiotic lock is generally continued:For entire systemic antibiotic course.

Typical durations:

Organism

Duration

CoNS

10–14 days

Gram-negative bacilli

10–14 days

Enterococcus

10–14 days

S. aureus

Usually catheter removal preferred


REFERENCES

  1. Beecham GB, Rout P. Dialysis Catheter. [Updated 2026 Apr 11]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK539856/
  2. Lok CE, Huber TS, Lee T, et al. KDOQI Clinical Practice Guideline for Vascular Access: 2019 Update. Am J Kidney Dis. 2020;75(4 Suppl 2):S1-S164.
  3. Mermel LA, Allon M, Bouza E, et al. Clinical Practice Guidelines for the Diagnosis and Management of Intravascular Catheter-Related Infection: 2009 Update by the IDSA. Clin Infect Dis. 2009;49(1):1-45.
  4. O’Grady NP, Alexander M, Burns LA, et al. Guidelines for the Prevention of Intravascular Catheter-Related Infections. Clin Infect Dis. 2011;52(9):e162-e193.