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Indications / Contraindications
Indications
- Urethral obstruction (BPH, stricture, stone) where urethral catheterization is impossible
- Urethral trauma or injury — pelvic fracture urethral disruption; SP catheter is definitive temporary drainage
- Urethral fistula or instrumentation contraindicated
- Failed urethral catheterization (tortuous urethra, urethral cancer, prior TURP anatomy)
- Bladder outlet obstruction after pelvic/urologic surgery
- Patient preference (spinal cord injury, comfort, long-term management)
- Temporary drainage while awaiting definitive urologic surgery
Contraindications
- Absolute: Non-distended/collapsed bladder — must have adequate urine volume (ideally ≥150-200 mL). IV fluids and wait if needed.
- History of lower midline surgery — adhesions, bowel loops in path. CT guidance or OR placement preferred.
- Pelvic malignancy with bladder involvement — tumor may be in needle path; CT planning essential
- Relative: Coagulopathy — Cat 1 procedure, but correct if possible
SIR Bleeding Risk
Category 1. No routine coagulation correction needed. INR/Plt if on anticoagulation.
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Pre-Procedure Checklist
Confirm bladder is distended. Bedside US to measure bladder volume. If <150 mL: IV fluids + wait, or consider CT guidance. Ideal: ≥300 mL. This is the single most important safety check.
Review CT if available. Confirm no bowel loops or adhesions in suprapubic region. If pelvic fracture/trauma: CT planning essential — assess hematoma in path before placing.
Labs. Minimal — Cat 1 procedure. INR/Plt if on anticoagulation.
Antibiotics. Situational — ceftriaxone 1g IV if infection suspected (pyuria, fever, urosepsis).
Consent. Bowel injury (~0.1% with US guidance), bladder perforation, hematuria, catheter dislodgement, peristomal infection, failed procedure if bladder not distended.
Patient position. Supine, head of bed slightly elevated (pushes bowel cephalad, away from access site).
NPO. Minimal — local + mild IV sedation only.
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Relevant Anatomy
Access Route
- Bladder: Sits in true pelvis, behind pubic symphysis. When distended, dome rises above pubic symphysis into lower anterior abdomen — this is your window.
- Retroperitoneal (extraperitoneal) — peritoneal perforation is rare with appropriate technique targeting dome of distended bladder
- Access site: 2-4 cm above pubic symphysis, midline or just lateral to midline
- Too low → hitting pubic bone. Too lateral → epigastric vessels or bowel risk.
- US appearance: Distended bladder = large anechoic structure above pubic symphysis with posterior acoustic enhancement
Danger Structures
- Small bowel: Can loop down anteriorly — especially with non-distended bladder or prior pelvic surgery
- Epigastric vessels: Avoid with lateral approach; stay near midline
- Peritoneum: Superior to distended bladder — aim at dome, not superior margin
- Pelvic hematoma: Trauma cases — CT first to assess hematoma in path
- Sigmoid colon: Left-sided approaches; confirm clear path on US before needle
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Technique
Default RadCall approach · share your own below
Supplies
Ultrasound + sterile probe cover
18G introducer needle
0.035" J-tip guidewire
12–16 Fr catheter with endhole (Coudé tip) OR dedicated SP catheter kit OR 16 Fr MPD
10 mL syringe (balloon inflation)
Serial dilators (8 → 16 Fr)
#11 scalpel
1% lidocaine
ChloraPrep + sterile drape
0-silk suture
Adhesive securing device
Drainage bag
Contrast + syringe (optional fluoroscopic confirmation)
Steps
1
US survey
Confirm bladder distension, measure volume, identify safe access site. Look for bowel loops in path with US. Confirm no Doppler vessels in intended track. Mark skin entry 2-4 cm above pubic symphysis, midline.
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Local anesthesia
1% lidocaine generously from skin down to anterior bladder wall. The bladder wall itself can be anesthetized — patient often feels needle entry otherwise.
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Needle access under real-time US
Under real-time US guidance, advance 18G needle through skin → anterior abdominal wall → into bladder dome. Confirm urine return. Inject small amount of contrast if fluoroscopy available to confirm bladder position (optional but helpful).
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Wire placement
Advance J-tip 0.035" wire into bladder. Confirm wire coiling in bladder on US (echogenic wire visible). If fluoroscopy: wire coils freely in pelvis. Do NOT advance wire if resistance felt before entering bladder lumen.
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Tract dilation
Make 1 cm skin nick with #11 blade at wire entry site. Serial dilate tract (8 → 12 → 16 Fr) over wire.
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Catheter placement
Advance 12–16 Fr catheter over wire into bladder. Remove wire. If using a Foley, inflate balloon (5–10 mL sterile water). Gentle traction confirms balloon seated in bladder — should have some give before hitting resistance. If using a pigtail catheter, lock the pigtail loop (this can then be exchanged by a urologist in the office 6–8 weeks later).
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Confirm and secure
Urine drains freely. US confirms catheter in bladder. Suture to skin + adhesive securing device. Connect drainage bag. Document volume drained, catheter size, and balloon volume.
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Troubleshooting
Problem
No urine return despite appearing intravesical on US
Likely cause: Needle tip at wall but not through it, or small residual volume.
Next step: Confirm needle tip position with US. Inject 5 mL normal saline and immediately re-aspirate. Try slightly deeper needle advancement under real-time US.
Problem
Wire won't advance freely
Likely cause: Needle hub not fully within bladder lumen (tip at wall), or wrong wire direction.
Next step: Ensure needle is fully within bladder — advance under US guidance. Try J-tip wire with gentle rotation. If still resistant: reconfirm position with contrast injection.
Problem
Bowel in the path on US
Likely cause: Inadequate bladder distension, prior pelvic surgery with adhesions, or off-midline approach.
Next step: Choose more midline access. Ensure adequate bladder distension (IV fluids, wait). Consider CT-guided placement or OR. Do NOT proceed through a bowel-containing path — risk of coloenteric fistula.
Problem
Gross hematuria post-placement
Likely cause: Tract oozing (common) vs. vascular injury (uncommon).
Next step: Pink urine from tract oozing is expected and clears with drainage. Persistent bright red blood: CT to evaluate for vascular injury. Bladder irrigation if clot retention concern.
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Complications
Immediate
- Bowel injury (~0.1% with US guidance — most serious; monitor closely post-procedure for peritoneal signs)
- Hematuria — common; usually self-limited tract oozing
- Bladder perforation/extravasation — if needle exits posterior bladder wall
- Peritoneal injury — targeting too superiorly into extraperitoneal space
- Failed procedure — non-distended bladder; most preventable complication
Delayed
- Catheter dislodgement — most common delayed complication; immature tract (<4-6 weeks) = urgent IR replacement
- Peristomal infection — local wound care ± antibiotics
- Bladder stone formation — long-term; urology follow-up
- Bladder spasm — from catheter irritation; anticholinergics may help
- Granuloma formation — around stoma site; dermatology/urology referral
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Post-Procedure Care
Monitoring
- Confirm drainage output immediately post-placement
- Monitor for bowel symptoms (abdominal pain, fever, rectal blood) for 24h — bowel injury can present delayed
- Urine output volume and color: pink → clear expected over 24-48h
- Gross hematuria: bladder irrigation consideration if clot retention risk
Follow-up
- Catheter care: gentle cleaning around site daily; drainage bag emptied regularly
- Exchange: every 4-6 weeks (Foley-type) or per catheter type guidance
- Urology follow-up for definitive management planning
- Patient/family education: drain care, dressing changes, signs of dislodgement or infection
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Critical Pearls
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Bladder MUST be distended — this is the single most important safety factor. A collapsed bladder is surrounded by bowel. If not distended: IV fluids, wait, or abort. There is no safe shortcut here. Ideal is ≥300 mL confirmed on US.
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US guidance is essential — do NOT place blind in IR. Real-time US shows the needle entering the bladder, excludes bowel in the path, and confirms wire coiling. Blind placement (acceptable bedside emergency by urology) is not our standard.
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Midline or just lateral to midline avoids epigastric vessels. The inferior epigastric vessels run along the lateral rectus. Midline approach through the linea alba is avascular and the safest path.
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After pelvic trauma: CT first. Don't blindly place through a pelvic hematoma. CT defines the hematoma extent and needle path. The SP catheter may need to be placed at an angle to avoid the hematoma.
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Foley balloon inflation check. If catheter may have slipped during placement, DO NOT inflate balloon until position is confirmed with urine return and US. Inflation in urethra or pelvic soft tissue is a serious complication.
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The head of bed slightly elevated position matters. Elevating 15-20° causes bowel loops to migrate cephalad by gravity, increasing the safe window between bladder dome and peritoneal contents. Don't skip this positioning step.
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Suprapubic Catheter Management
Exchange Schedule
- Silicone-tipped Foley: Every 4-6 weeks
- Dedicated SP catheter systems: Every 3 months
- Mature tract (≥4-6 weeks): Bedside exchange via mature tract acceptable. First exchange within IR under fluoroscopy or over wire preferred.
- Immature tract (before maturation): Exchange over guidewire only — in IR under fluoroscopic guidance
Signs of Complications
- Fever + suprapubic pain: Infection / blocked catheter — flush + culture + antibiotics
- Catheter not draining: Kinked, obstructed, or dislodged — check position, flush, exchange if needed
- Urine leaking around catheter: Too small, bladder spasm, or partial dislodgement — assess on imaging
- Dislodgement of immature tract: Urgent IR referral — tract closes quickly in <4 weeks
Exchange Technique
| Tract Age | Exchange Method | Where |
|---|---|---|
| <4 weeks (immature) | Over guidewire only — Seldinger technique | IR with fluoroscopy |
| 4-6 weeks (maturing) | Over guidewire preferred; direct replacement possible | IR or bedside with caution |
| >6 weeks (mature) | Direct replacement via mature tract acceptable | Bedside or clinic |
| Any age with difficulty | Over guidewire with fluoroscopic confirmation | IR |
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References & Resources
Primary sources · Key data · Related procedures
Key Guidelines
- EAU guidelines on urological infections and catheter-associated UTI
- SIR practice standard for suprapubic catheterization
Primary References
- Ahluwalia RS, Johal N, Kouriefs C, Kooiman G, Montgomery BS, Plail RO. The surgical risk of suprapubic catheter insertion and long-term sequelae. Ann R Coll Surg Engl. 2006;88(2):210–213.
- Sheriff MK, Foley S, McFarlane J, Nauth-Misir R, Hamid R, Shah PJ. Long-term suprapubic catheterisation: clinical outcome and satisfaction survey. Spinal Cord. 1998;36(3):171–176.
- Wyndaele JJ. Complications of intermittent catheterization: their prevention and treatment. Spinal Cord. 2002;40(10):536–541.