What is lead migration and why is it problematic?

• A. Displacement of the lead from the intended position; reduces efficacy and may cause pain or malfunction.
• B. A slight repositioning that improves sensing.
• C. An expected movement that has no clinical impact.
• D. A method to reduce infection risk.

Answer: (A)

Lead migration means the implanted stimulation lead moves away from its intended position after placement. When this happens, the electrical field no longer lines up with the target nerve fibers, so the therapy loses its effectiveness. Patients may experience reduced symptom relief, new paresthesias, or even pain or uncomfortable stimulation because the lead is no longer delivering energy to the planned area. Because neural stimulation relies on precise positioning, even small shifts can markedly change outcomes, and a migrated lead often requires repositioning or revision surgery to restore proper therapy. Imaging and re-implantation are sometimes needed to confirm and correct the lead’s location.

This is why the described option is the best choice: it accurately captures displacement from the target position and the resulting impact on efficacy and safety. The idea that a slight repositioning improves sensing isn’t typical for migration, which usually degrades performance. Migration isn’t an expected motion with no impact, and it isn’t a method to reduce infection risk.