<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A formula which takes into account the physiologic shortening of the QT interval which occurs as the heart rate increases, permitting comparison of the QT interval across a range of rates. It is mathematically defined as: QTcF = QT/CubeRootRR(seconds) and theoretically corrects the QT interval to that which would be observed at a heart rate of 1 cycle per second. (NCI)</n0:def-definition><n0:def-source>CDISC</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A formula which takes into account the physiologic shortening of the QT interval which occurs as the heart rate increases, permitting comparison of the QT interval across a range of rates. It is mathematically defined as: QTcF = QT/CubeRootRR(seconds) and theoretically corrects the QT interval to that which would be observed at a heart rate of 1 cycle per second.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>