Hypocalcemia: ECG effects

Clinical - Endocrine/Metabolic

Hypocalcemia typically prolongs the Q-T interval on electrocardiograms and may lead to complete heart block .

Other signs and symptoms include mental status changes, tetany, laryngospasm, Chvostek (facial nerve) and Trousseau (brachial artery occlusion) signs, hypotension, and arrhythmias.

Hypercalcemia (increased serum calcium) produces a quicker ventricular repolarization and therefore shorter Q-T interval.


  • Cardiac: prolonged QT and possible heart block . Hypotension, other arrhythmias
  • Neurologic: MS changes, tetany, laryngospasm, Chvostek (facial n.) and Trousseau (brachial a.) signs


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