What is the role of impedance checks during clinic visits?

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Impedance checks test the electrical path from the device generator through the lead to the electrode and back, confirming continuity and the integrity of both the lead and the electrode contact. This helps ensure the stimulation or sensing circuit will work reliably and that faults are caught early before symptoms appear.

If impedance is in the expected range, it means the lead is connected properly and the electrode is likely in good contact with tissue, supporting consistent therapy. If impedance is too high, there may be an open circuit from a fracture or loose connection; if too low, there may be a short or an insulation problem. The information guides troubleshooting or planning lead repair/replacement and informs programming decisions to maintain safe, effective therapy.

Those other options don’t relate to electrical testing of the system, so they aren’t what impedance checks assess.