When the facial nerve is tapped in front of tragus the facial muscles on the same side of the face will contract momentarily typically a twitch of the nose or lips because of hypocalcemia i. The Trousseau sign of latent tetany is also often used to detect early tetany.
In his professional life, Chvostek devoted himself to the study of etiopathogenesis and to the treatment of neurological disorders, including by means of electrotherapy.
In , he first described the sign that bears his name. Response occurs in the form of ipsilateral contraction of some or all of the muscles innervated by the facial nerve.
Hitting a point between the middle third and upper third of the line joining the angle of the mouth to the zygomatic process gives rise to only a contraction of the muscles of the mouth and nose.
It may also be present in hypomagnesemia ,   Magnesium is a cofactor for adenylate cyclase.
It is also seen in measles, tetanus and myxedema. From Wikipedia, the free encyclopedia.
Chvostek's and Trousseau's signs". The New England Journal of Medicine.
Beitrag zur Tetanie. Wien Med Press ;, —27, —58, — Centralbl Gesammt Ther ; South African Medical.
Etiology and clinical spectrum". Acta Medica Scandinavica.
Rapid Review Pathology. Mosby, Elsevier, ; pp. American Journal of Surgery. Journal of Developmental Physiology. Archives of Internal Medicine.
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