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A 37-year-old man presents after a syncopal event. He has schizophrenia and bipolar disorder, for which, risperidone was recently started. On arrival, heart rate and blood pressure were normal, potassium was 3.2 meq/dL (0.82 mmol/L), magnesium was 2.5 meq/dL (1.1 mmol/L), calcium was 8.7 mg/dL (2.2 mmol/L) and cardiac biomarkers were normal. Bedside echocardiogram showed grossly normal LV systolic function. His presenting ECG is shown in figure 1.
Which finding is seen on this ECG, and what is the likely subsequent clinical scenario?
Hyperacute T waves—early ST …
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