Chvostek's sign - why hypocalcemia causes it?

[boarding]

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Why does hypocalcemia cause muscle twitch of face after tapping (Chvotek's sign) ?

(side note: this usually means the patient has hypo-parathyroidism, hence the low calcium)

 

[cbrons]

Increased membrane permeability to Na+ (decreased threshold potential) = easier to generate action potentials.

 

[aspiringmd1015]

^neuronal hyperexcitability