What is the most direct effect of increasing stimulation amplitude in SNM?

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Increasing stimulation amplitude in sacral neuromodulation directly raises the intensity of the electrical stimulation delivered to the sacral nerves. That stronger stimulation activates more nerve fibers and strengthens the neuromodulatory signal to the pelvic floor and bladder control pathways, so you typically perceive a stronger sensation and may achieve greater symptom relief. Of course, too high an amplitude can be uncomfortable, so settings are balanced for relief and comfort. If the amplitude is too low, activation is insufficient and symptoms persist.