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Chvostek's sign consists in a visible twitch of the facial musculature, especially of the orbicularis palpebrarum or of the orbicularis oris, in response to a gentle tap administered over the facial nerve in front of the ear. Trousseau's sign is the production of tetany by applying firm and prolonged pressure to the brachial nerve in the upper arm.
Of this heightened irritability of the nervous system, to which the name "spasmophilia" has been given in America and on the Continent, the most striking symptom is a liability alike to tetany or carpo-pedal spasm, to generalised convulsions, and to laryngismus stridulus. In addition, in most cases it is generally possible to demonstrate the presence of Chvostek's sign and of Trousseau's sign.
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