What clinical outcome would indicate a successful SNM trial before permanent implantation?

• A. A meaningful reduction in symptoms during the test stimulation period.
• B. Any perception of stimulation.
• C. Complete elimination of all bodily sensations.
• D. Immediate packaging of device.

Answer: (A)

The main idea here is that the SNM trial is about whether the therapy truly helps reduce the patient’s symptoms, not just whether the device can be felt. If stimulation during the test period leads to a meaningful drop in urinary or bowel symptoms, it shows that modulating the sacral nerves can effectively improve function. That improvement during the trial is the best predictor of lasting benefit once a permanent implant is placed.

Sensing the device or feeling any stimulation doesn’t guarantee symptom relief, and can even be uncomfortable without translating into real improvement. Expecting complete elimination of all sensations isn’t realistic for this kind of therapy, since the goal is to lessen specific symptoms, not erase all sensation. The trial outcome isn’t about logistics like implanting anything immediately; it’s about whether symptom relief during the test period warrants proceeding with permanent implantation.