What are the characteristics of grade IV Bell palsy (idiopathic facial paralysis) (IFP)?

Updated: Jun 14, 2019
  • Author: Danette C Taylor, DO, MS, FACN; Chief Editor: Selim R Benbadis, MD  more...
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Grade IV is moderately severe dysfunction. Signs include the following:

  • An obvious weakness and/or disfiguring asymmetry is noted

  • Symmetry and tone are normal at rest

  • No forehead motion is observed

  • Eye closure is incomplete

  • An asymmetrical mouth is noted with maximal effort

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