What is the role of a maximal stimulation test (MST) in the workup of congenital facial paralysis?

Updated: Jan 07, 2019
  • Author: Alan D Bruns, MD, FACS; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Maximal stimulation test (MST)

  • This test is similar to NET but uses maximal stimulation. It is valuable for determining the status of neuromuscular units.

  • If nerve conduction is neurapraxic, response is positive; if nerve conduction is degenerated, response is absent.

  • Sectioned nerve can still be stimulated for 24-72 hours after injury; thus, the test cannot be interpreted until 3 days later.

  • The test is graded subjectively (equal, decreased, absent).

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