less than 1/2 of the R-R interval (approx <0.42s)
Causes of Prolonged QT:
1-Meds:
2-Electrodisturbances (hypOCa+ and hypOK+)
3-Congenital
4-Ischemia
5-CNS lesion
6-Bradyarrhythmia
How to get the corrected QT interval (QTc):
What is it "correcting" for? The heart rate. The length of the QT interval is obviously dependent on the rate the heart is pumping so the QTc adjusts for this.
Pic: http://www.mayoclinic.com/health/medical/IM02677
Pic: http://heart.bmj.com/content/93/9/1051.abstract
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