True about Chvostek's sign are all of the following except: March 2010, March 2013
Ans. C: Raised calcium levelPTH is essential for life. After parathyroidectomy, there is a steady decline in the plasma Ca2+ level. Signs of neuromuscular hyperexcitability appear, followed by full-blown hypocalcemic tetany.In humans, tetany is most often due to inadveent parathyroidectomy during thyroid surgery. Symptoms usually develop 2-3 days postoperatively but may not appear for several weeks or more. Injections of PTH correct the chemical abnormalities, and the symptoms disappear. Injections of Ca2+ salts give temporary relief.The signs of tetany in humans include Chvostek's sign, a quick contraction of the ipsilateral facial muscles elicited by tapping over the facial nerve at the angle of the jaw; and Trousseau's sign, a spasm of the muscles of the upper extremity that causes flexion of the wrist and thumb with extension of the fingers
Denotes neuromuscular hyperexcitability
Elicited over face
Raised calcium level
Facial nerve is stimulated by tapping