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A prolonged QT interval can be seen in people with congenital long QT syndromes or with people using medications that affect the ion channels involved in long QT syndromes. To see whether exercise could increase the QT interval, researchers in Italy evaluated 310 consecutive patients who were referred to a sports medicine clinic because of a suspected long QT. Italy mandates pre–sports participation physicals and electrocardiograms.
Of these patients, 111 were not included because they had a normal electrocardiogram, were diagnosed with a different cardiac disease, or were lost to follow-up. Of the other 199, 166 were diagnosed with the long QT syndrome. The remaining 33 were asymptomatic and had no family history of long QT syndromes but me…