A simple ultrasound test might predict who suffers most from stent pain

This observational study tests a new ultrasound-based measure called the Pelvic Floor Fatigue Index (PFFI), which gauges how quickly pelvic floor muscles tire. Researchers will measure PFFI in 75 adults before they undergo ureteroscopy or retrograde intrarenal surgery for kidney stones, followed by placement of a ureteral stent. They will then see if a higher PFFI (more fatigable muscles) correlates with worse stent-related symptoms, as reported on a questionnaire 10 days after surgery. The study also checks whether the PFFI measurement is consistent when repeated, aiming to validate it as a useful clinical tool.