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Diagnostic biomarker
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== ECG == ===Short QT interval=== ''{{main article| page_name =Short QT interval}}'' [[File:ECG.jpg|thumb|250x250px|ECG results ]] "Automated measurement of QTc [QT corrected] in clinical practise has potential utility as a diagnostic biomarker in CFS."<ref name="Scott, 2012" /> The electrocardiographic QT interval is shorter in patients with ME/CFS than those of the general population.<ref name="Scott, 2012" /> The only exception is in those who have a rare genetic illness, Short QT syndrome. Differentiation is easy to determine because those with Short QT syndrome also have tall and peaked T waves, whereas the T waves are normal in people with ME. Modern computer-based ECG machines are programmed to correct the QT interval in relation to heart rate, because a number of medical conditions elicit a prolonged QT interval. Obstacles for use: medical personnel education needed to recognize this finding on the EKG finding as indicative of ME/CFS; modern computer-based EKG machine needed
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