Chvostek Sign

Chvostek sign is positive if the homolateral twitch of the upper lip filter towards the side of the tap is triggered when the facial nerve branch is tapped, preferably above the parotid gland or closer to the corner of the mouth. It is a manifestation of increased idioneural excitability. The sign tends to be positive in hypocalcemia.

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 * Hypocalcemia
 * Tetany
 * Trousseau sign