https://www.selleckchem.com/pr....oducts/LY2228820.htm
Whether the QT interval displays circadian rhythm after heart rate correction is unresolved and the relationship of QT interval to heart rate variability (HRV) is uncertain. To test the hypothesis that there is a circadian rhythm to QT interval and HRV and determine the relationship between QTc and HRV. The hourly average ECG data from 24-h ECGs were examined in individuals (50 without medications and 9 on beta blockers only) with no evidence of coronary artery disease or structural heart disease. The QT duration of normal QRS complex
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