The identification of ECG changes associated with electrolyte derangements including hypercalcemia is critical as the associated conduction abnormalities carry the risk of progression to fatal ventricular dysrhythmias (such as ventricular fibrillation). ECG findings commonly associated with hypercalcemia include shortening of QT interval (QTC <360ms) and the presence of Osborn J-waves. Shortening of the QT interval can result in a “high-takeoff” of the ST-segment, mimicking myocardial ischemia or infarction.



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