Medical science monitor : international medical journal of experimental and clinical research
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Comparative Study
QT interval in normal infants during sleep with concurrent evaluation of QT correction formulae.
Physiological changes in the QT interval caused by sleep are important in the evaluation of the normal QT interval. Traditionally, Bazett's formula is used for correcting the QT interval for heart rate in childhood. We set out to establish the QT-RR relationship in infants during sleep and concurrently test the performance of four QT correction formulae to determine their comparability and clinical utility. ⋯ These formulae are strongly dependent on heart rate. In the setting of a borderline QTc Bazett prolongation, Hodges formula may be a useful adjunct. Normal infants may have a slightly longer QTc Bazett during sleep.