ST-segment elevation myocardial infarction is an important, life-threatening diagnosis that requires quick diagnosis and management. We describe the case of an 83-year-old man with coronary artery disease, ischaemic cardiomyopathy with left ventricular ejection fraction of 15%, newly diagnosed multiple myeloma that had an initial ECG showing ST-segment elevation in anterior leads V1–3 and ST-segment depression in lateral leads concerning for an ST-segment elevation myocardial infarction. Troponins were negative and his calcium was 3.55 mmol/L. It was thought that the ECG changes were not indicative of cardiac ischaemia but, rather, hypercalcaemia. He was treated with fluids, diuretics and zolendronic acid, with subsequent resolution of ST-segment changes. This case demonstrates that one must consider disease other than myocardial ischaemia as the culprit of ST-segment changes if physical examination and history do not point towards myocardial injury, as unnecessary invasive revascularisation procedures have inherent risks.
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