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Spinal Accessory Nerve Monitoring in Selective and Modified Neck Dissection

Objectives: To determine whether a threshold increase in current is required to stimulate the spinal accessory nerve (SAN), comparing current on initial identification of the SAN and after completion of the dissection and before closure for selective neck dissection (SND), zones 1, 2, and 3, and modified radical neck dissection (MRND), zones 1, 2, 3, 4, and 5, and compare clinical outcome measures for “shoulder syndrome” for SND and MRND.