Evoked Potential

Facial Nerve Monitoring

Left side issue, left side monitoring, right side issue, right side monitoring

Frontalis, orbicularis oculi, buccinator, orbicularis oris, platysma and right orbicularis oris (anesthesia control) for left facial nerve branch monitoring.

Facial Nerve Monitoring of affected side. 5 muscle groups are monitored; Frontalis, Orbicularis Oculi, Nasalis, Orbicularis Oris and the Platysma. Stimulation often happens during removal of the tumor, typically set at 1mA at 0,5 Hz for identification. A ground electrode is placed at the mastoid for proper stimulation return. 

Monitoring of the left and right 7th cranial nerves

Types of surgery: parotidectomy, radical neck dissection, parotid gland, lymph nodes

looking for mechanical displacement, stretching, and/or heating due to eletrocautery of these branches.

Evoked EMG activity could also be employed to identify the location of the 7th cranial nerve with a stimulus being delivered at 200 ms square wave pulse (0.05-8.0 mA; 5.1 stim/sec) using a ball-tipped probe with the return inserted into tissue near the wound retractor. Response threshold used primarily to predict possible neuropraxia. A subdermal needle placed on the right frontalis muscle served as ground. 
 

Evoked Potential
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