Chvostek sign or Weiss sign

 

  • One of the signs of tetany seen in hypocalcemia.
  • An abnormal reaction to the stimulation of the facial nerve.
  • When the facial nerve is tapped at the angle of the jaw (i.e. masseter muscle), the facial muscles on the same side of the face will contract momentarily (typically a twitch of the nose or lips)

Pathophysiology

due to hypocalcaemia (ie from hypoparathyroidism, pseudohypoparathyroidism, hypovitaminosis D) with resultant hyperexcitability of nerves.

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