Meaning of Long QT Syndrome
Long QT Syndrome includes prolongation of the corrected QT interval beyond 440 ms for adult males, 460 ms for adult females and 50 ms in the presence of ventricular depolarization abnormalities (i.e., bundle branch blocks or IVCB more than 120 ms. A normal QT interval in a resting ECG with a failure to shorten with an increase in heart rate qualifies as Long QT Syndrome.
Source: http://evs.nci.nih.gov/ftp1/CDISC/SDTM/SDTM%20Terminology.xls
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