Management of Distal Ureter Stones with Medical Expulsive Therapy

Initial Management Approach

The American Urological Association recommends that patients with uncomplicated distal ureteral stones ≤10 mm should be offered observation, with distal stones specifically benefiting from medical expulsive therapy (MET) using alpha-blockers 1, 2
Alpha-blockers significantly improve stone-free rates for distal ureteral stones <10 mm (77.3%) compared to placebo or no treatment (54.4%) 1, 3
For a 4 mm distal ureteral stone, the probability of spontaneous passage is high, especially with medical assistance 4

Patients should be counseled that alpha-blockers are used "off-label" for this indication and informed about potential side effects 5, 6
Ensure the patient has well-controlled pain, no clinical evidence of sepsis, and adequate renal function before attempting MET 6

The European Association of Urology recommends prescribing NSAIDs (e.g., diclofenac, ibuprofen) as first-line analgesics for renal colic 4
Use opioids as second-line therapy only if NSAIDs are contraindicated or insufficient 4

Follow patients with periodic imaging studies to monitor stone position and assess for hydronephrosis 6
If symptoms worsen, develop fever, or if there's evidence of obstruction, immediate reassessment is required 5
Maximum duration for conservative therapy should be limited to approximately 4-6 weeks to avoid kidney injury 7

For patients who fail observation or MET, ureteroscopy (URS) or extracorporeal shock wave lithotripsy (SWL) should be offered 5, 7
URS generally has higher stone-free rates but slightly higher complication rates compared to SWL 5, 6
For patients with bleeding disorders or on anticoagulation therapy who require intervention, URS should be considered first-line 7

Ensure urine culture is performed prior to any intervention to rule out infection 5, 6
If infection is suspected or proven, appropriate antibiotic therapy should be administered before intervention 6
Blind basketing (stone extraction without endoscopic visualization) should never be performed due to risk of ureteral injury 5, 6

Ureteric stones larger than 10 mm typically require surgical intervention, while stones smaller than 10 mm can often be managed conservatively with observation and medical expulsive therapy 8
Surgical intervention is recommended in most cases for stones >10 mm 8
For stones >10 mm, surgical options should be discussed with the patient 8

Both shock wave lithotripsy (SWL) and ureteroscopy (URS) are acceptable first-line treatments 8
URS yields significantly greater stone-free rates for most stone stratifications 8
URS has a better chance of achieving stone-free status with a single procedure but has higher complication rates 8
Distal ureteral stones have high success rates with both SWL and URS 8

In pediatric patients with ureteral stones <10 mm, both SWL (87%) and URS (95%) have high stone-free rates 9

URS complications include ureteral injury (3-6% depending on stone location), stricture (1-4% depending on stone location), and sepsis (2-4% depending on stone location) 8
SWL complications include Steinstrasse (stone street) (4-8% depending on stone location), sepsis (3-5% depending on stone location), and UTI (4-6% depending on stone location) 8