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Frequently Asked Questions
  SSEP— Somatosensory Evoked Potential

Mixed nerve somatosensory evoked potentials test both sensory and motor nerve fibers in the peripheral nervous system to the spinal cord. In an upper profile (cervical and extremities), the pure sensory nerves and myelin sheath which ascend to the sensory cortex in the central nervous system can be tested by means of interpeak measurements. This test determines if there are any demyelinating lesions in the peripheral nerves. Brachial plexus or central nervous system medial, ulnar, and radial nerves can be tested with this procedure. The lower profile (lumbar and extremities) SSEP usually studies the posterior tibial nerve.

SSEPs aid in the evaluation of:

- Abnormal skin sensation
- Nerve root compression
- Spinal cord tumor
- Spinal trauma or injury
- Cervicobrachial syndrome
- Thoracic outlet syndrome
- Multiple sclerosis
- Herniated discs

- Radiculopathy
- Neuritis
- Myelopathy
- Numbness and tingling
- Burning sensation
- Diabetes
- Plexopathy

Other tests that complement the SSEP:
Dermatosensory evoked potential (DEP)
Nerve conduction velocity (NCV)
Musculoskeletal or spinal ultrasound