Why the study?
Does the nighttime period alter the beat-to-beat variability of the QT interval compared to the daytime period in adults without heart disease?
Population
Adults without clinical evidence of heart disease
Comparison
Nighttime period during ambulatory… vs Daytime period during ambulatory…
Design
Cross-sectional
Authors
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Provides nocturnal QT variability reference in healthy adults; hypothesis-generating for arrhythmic risk stratification in disease.
Does the nighttime period alter the beat-to-beat variability of the QT interval compared to the daytime period in adults without heart disease?
Beat-to-beat QT variability decreases at night with a shift to higher frequencies representing vagal preponderance, providing a physiological baseline that may help evaluate arrhythmic risk in patients with heart disease.
Kostis et al. (2000) studied this question.
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