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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Million Dollar View (Sa ... Duck Lake - Calhoun County, Michigan, USA. Add Duck Lake - Calhoun County Pictures! Located in Calhoun County, Duck Lake is a 629-acre lake near the small community of Springport in south-central Michigan. Listed as one of Michigan's 50 Best Fishing Lakes by the Michigan United Conservation Club, Duck Lake has a reputation for producing large fish in great numbers.