What is the proper technique for flushing a nephrostomy tube?

Flushing Nephrostomy Tubes

Flush nephrostomy tubes with 5-10 mL of sterile normal saline using gentle, steady pressure through the catheter hub, stopping immediately if resistance is encountered to avoid collecting system rupture or trauma.

Technique Overview

The proper flushing technique involves:

• Use sterile normal saline (0.9% NaCl) as the irrigation fluid
• Volume: 5-10 mL per flush is typically sufficient
• Frequency: Daily or as needed when drainage appears sluggish or debris is visible
• Pressure: Gentle and steady - never force against resistance
• Equipment: Sterile syringe (10-20 mL) connected directly to the catheter hub

Step-by-Step Procedure

1. Prepare sterile field and gather supplies (sterile saline, syringe, gloves, alcohol wipes)
2. Don sterile gloves and clean the catheter hub connection with alcohol
3. Disconnect drainage bag temporarily while maintaining sterile technique
4. Attach syringe with 5-10 mL sterile saline to catheter hub
5. Inject slowly with gentle, steady pressure over 30-60 seconds
6. Stop immediately if you meet firm resistance
7. Aspirate gently to confirm patency and remove debris
8. Reconnect drainage system and secure all connections

Critical Safety Considerations

When NOT to Flush

• Never force fluid against solid resistance - this risks collecting system rupture, fornix rupture, or renal parenchymal injury
• Do not flush if patient has acute flank pain during the attempt
• Stop if gross hematuria develops during flushing

Catheter Occlusion Management

If the catheter is completely occluded and won't flush:

• Do not persist with forceful flushing attempts
• The catheter likely requires exchange rather than salvage flushing 1
• Occlusion rates are common with indwelling catheters due to debris, blood clots, or encrustation 1
• Consider urgent catheter exchange if patient develops fever, flank pain, or rising creatinine suggesting obstruction

Common Pitfalls

Mild hematuria after flushing is expected - approximately 50% of patients experience some hematuria with nephrostomy manipulation 1, but persistent or heavy bleeding requires evaluation for vascular injury.

Encrustation and blockage are frequent complications with long-term nephrostomy tubes 1. Regular flushing helps prevent but doesn't eliminate this risk. Tubes typically require scheduled exchanges every 6-12 weeks regardless of flushing regimen.

Infection risk - use strict sterile technique as the nephrostomy provides direct access to the renal collecting system. Diabetes and renal calculi increase infection risk, though they don't predict post-procedural sepsis 1.

When to Seek Immediate Help

Contact interventional radiology or urology emergently if:

• Unable to flush despite gentle technique
• Patient develops fever >38.5°C or sepsis signs
• Persistent gross hematuria after flushing
• Catheter dislodgement (never attempt to reinsert - requires imaging-guided replacement)
• Severe flank pain during or after flushing

The ACR guidelines emphasize that percutaneous nephrostomy management requires appropriate imaging guidance and interventional expertise 1, so complicated situations warrant specialist consultation rather than repeated bedside manipulation attempts.