http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
This video demonstrates Chvostek's sign in a 53-year-old who presented two weeks after near total thyroidectomy for obstructive nodular goitre. Chvostek's sign is traditionally elicited by tapping on the face at a point just anterior to the ear and below the zygomatic bone. A positive response is represented by twitching of the ipsilateral facial muscles, suggesting neuromuscular excitability caused by hypocalcaemia.
Title from resource description page (viewed August 20, 2021).