<prompt> Hypocalcemia results in: September 2010Absent tendon reflexesShoened QT interval in ECGReduced excitability of nerves and muscle cellsTetany  <response>: Ans. D: TetanyFeatures of hypocalcemia:Petechia which appear as one-off spots, then later become rashes.Perioral tingling and paraesthesia, pins and needles sensation over the extremities of hands and feet. This is the earliest symptom of hypocalcaemia.Tetany, carpopedal spasm are seen.Trousseau sign of latent tetany eliciting carpal spasm by inflating the blood pressure cuff and maintaining the cuff pressure above systolicChvosteks sign tapping of the inferior poion of the zygoma will produce facial spasmsTendon reflexes are hyperactiveLife threatening complications- Laryngospasm- Cardiac arrythmiasECG changes include:- Prolonged QT interval- Prolonged ST interval 