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CHVOSTEK SIGN- HYPOCALCEMIA video
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CHVOSTEK SIGN-The Chvostek sign (/ˈkvɒstɪk/) is a clinical sign of hypocalcemia. It is evidenced by the twitching of muscles innervated by the facial nerve (CNVII).It refers to an abnormal reaction to stimulation of the facial nerve. When the facial nerve is tapped in front of the tragus, the facial muscles on the same side of the face (ipsilateral) will contract momentarily (typically a twitch of the nose or lips), because of hypocalcemia (i.e. from hypoparathyroidism, pseudohypoparathyroidism, hypovitaminosis D), with resultant hyperexcitability of nerves. Though classically described in hypocalcemia, this sign may also be encountered in respiratory alkalosis, such as that seen in hyperventilation, which causes decreased serum calcium with a normal calcium level due to a shift of Ca2+ from the blood to albumin which has become more negative in the alkalotic state.
симптом Хвостека (лицевой феномен, сокращение мышц лица в ответ на удар молоточком в области прохождения лицевого нерва)
симптом Хвостека (лицевой феномен, сокращение мышц лица в ответ на удар молоточком в области прохождения лицевого нерва)
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