A signal return-path symmetry measurement apparatus includes a transformer and monitoring circuitry. The transformer is coupled to first and second return-path electrodes that are attached to a body of a patient and serve as a return path for an electrical signal applied to the patient. The transformer is configured to generate a return-path-difference electrical signal responsive to a difference between electrical signals returning from the first and second return-path electrodes. The monitoring circuitry is configured to generate an electrode symmetry measure responsive to the return-path-difference electrical signal.
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