Specific tests for tetany of hypocalcemia

a. Chvostek sign. Elicited by tapping on the facial nerve below the zygomatic arch and 2 cm anterior to the earlobe. Positive sign ranges from twitching of the lip at the angle of the mouth to contraction of the facial muscles.

b. Trousseau sign. Performed by inflating a BP cuff on the upper arm to just above systolic BP for 3 minutes. With hypocalcemia, carpal spasm may occur in response to ischemia of the ulnar nerve.

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