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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The Market Street Bridge, spanning the Tennessee River in Chattanooga. The Steamboat Bill Hudson Memorial Bridge in Decatur, Alabama. Natchez Trace Parkway, crossing the Tennessee River in Cherokee, Alabama. The Tennessee River is the largest tributary of the Ohio River. It is approximately 652 miles (1,049 km) long and is located in the southeastern United States in the Tennessee Valley.