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| Description: Both Chvostek sign, A, and Trousseau sign, when positive, B, indicate increased neuromuscular excitability when the level of free, ionized calcium is decreased, as occurs in alkalosis. Chvostek sign can be elicited by tapping the face in front of the ear just below the temple where the facial nerve is located; when there is increased neuromuscular excitability, the facial nerve causes contraction of the lips, nose, and face on the side that was tapped. Trousseau’s sign is elicited by increasing pressure on nerves in the arm by inflating a blood pressure cuff just above the systolic pressure for a few minutes. If increased neuromuscular excitability is present, the pressure will result in a carpal spasm of the hand. Figure A shows a woman scrunching the right side of her face, which is labeled Chvostek sign. Figure B shows an arm bent at the elbow with a blood pressure cuff, which labeled Trousseau sign. Picture Stats: Views: 21 Filesize: 159.19kB Height: 872 Width: 2126 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=49811 |