The QT interval comprises the QRS-complex, the ST-segment, and the T-wave. One difficultly of QT interpretation is that the QT interval gets shorter as the heart rate increases. Thus at a heart rate of 60 bpm, the RR interval is 1 second and the QTc equals QT/1.
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Shelby County is a county in the U.S. state of Tennessee. As of the 2010 census, the population was 927,644. It is the state's largest county both in terms of population and geographic area. Its county seat is Memphis, a port on the Mississippi River and the second most populous city in Tennessee. The county was named for Governor Isaac Shelby of Kentucky. Shelby County is part of the Memphis, TN-MS-AR Metropolitan Statistical Area. It is bordered on the west by the Mississippi River. Located wi