Management of Foley Catheters in Patients with Pelvic Fractures

Initial Assessment and Catheterization

In patients with pelvic fractures, a Foley catheter should not be blindly inserted before performing retrograde urethrography if blood is present at the urethral meatus, as this could worsen urethral injury 1, 2
Perform retrograde urethrography in all patients with pelvic trauma who have blood at the urethral meatus before attempting catheterization 1, 2
If no blood is present at the meatus and suspicion of injury is low, a Foley catheter may be placed without prior imaging 3, 1
If a Foley catheter has already been placed before evaluation and blood is present, perform a pericatheter retrograde urethrogram to identify potential missed urethral injury 3, 1

For patients without blood at the urethral meatus, standard urethral catheterization with a 14-16 Fr Foley catheter is appropriate 4
For patients with blood at the urethral meatus, perform retrograde urethrography before catheterization 1, 2
Based on urethrography results, complete urethral disruption requires placement of a suprapubic tube (SPT) for urinary drainage 3, 1
Partial urethral disruption may allow a single attempt with a well-lubricated catheter by an experienced provider 1, 2

Prompt urinary drainage is essential in patients with pelvic fracture urethral injury (PFUI) 3, 1
Suprapubic tube (SPT) placement is appropriate when urethral catheterization is contraindicated 3, 1
SPT may be placed percutaneously or via open technique depending on the clinical setting 1
Avoid repeated attempts at urethral catheter placement as this can increase injury extent and delay drainage 1

Primary realignment may be considered in hemodynamically stable patients with PFUI, but should not involve prolonged endoscopic attempts 3
For patients with bladder injuries requiring surgical repair, urethral catheter drainage without SPT is the standard approach 2, 5
Small caliber percutaneous SPT catheters will require upsizing in cases of hematuria, prolonged use, or in preparation for future definitive surgical repair 1

In adults with suspected urethral injury (e.g., blood at the meatus), obtain a retrograde urethrography before any catheter insertion to exclude urethral disruption. 6
Use a well‑lubricated catheter for all attempts to reduce friction and minimize mucosal trauma. 6

Begin with a 12–14 French catheter when resistance is encountered; this size balances ease of passage with adequate drainage. 7
Avoid upsizing beyond 18 French unless there is a specific indication such as massive hematuria or clot evacuation, because larger sizes provide little additional flow benefit. (derived from cited literature on flow plateau)

Smaller catheters (12–14 Fr) have softer, more flexible tips that navigate anatomical variations and partial injuries more safely. 7

Allow only one gentle insertion attempt by an experienced provider in cases of partial urethral disruption; further attempts increase morbidity. 6
If the initial 12–14 Fr catheter cannot be placed safely, proceed directly to suprapubic catheter placement for drainage. 6

Standard adult catheters (including 12–14 Fr) achieve flow rates ≥300 mL/min at prepump pressures not more negative than –250 mm Hg, which is sufficient for most dialysis and drainage needs. [7][8]
Above 18 French, flow rates plateau with diminishing returns; therefore, increasing catheter size is not an effective strategy for improving drainage.

All statements are based on peer‑reviewed evidence; specific levels of evidence were not provided in the source articles.