Definition Hyper-/Hypocalcemia can cause ECG changes secondary to altered trans-membrane potentials that affect conduction times. (Sources 1,2). Hypercalcemia: The most common ECG findings of hypercalcemia are a short QT interval (Ref. 1) secondary to a shortened ST segment. (Source 3) There may also be a widened or flattened T wave; however, significant hypercalcemia can cause […]