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Beat-to-beat Analysis of the Relation between RT and RR Intervals in Newborns

Journal of Perinatology volume 23, pages 212–217 (2003)Cite this article

Abstract

OBJECTIVE: To evaluate the dynamic RT (QRS apex-end of T wave) rate dependence in newborns.

STUDY DESIGN: A Digital Holter ECG was acquired on day 15 in nine full-term and eight preterm infants. Ten-minute periods were recorded during wakefulness and sleep. The accuracy of fit with RT–RR pairs was individually assessed by 14 regression formulas (r coefficient, Akaike score, residual analysis). The medians of RT and Bazett's RT correction were calculated for each 10 milliseconds of RR.

RESULTS: The mean RR and RT were 429±51 and 263±18 milliseconds. None of the prediction formulas were sufficiently accurate to describe RT over the whole range of RR (r<0.56). The Bazett correction produced differences of more than 50 milliseconds at different RR. Prematurity, sleep state and heart rate variability did not influence RT–RR relation.

CONCLUSION: None of the parametric formulas were found to be accurate in describing RT rate dependence in newborns.

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Authors and Affiliations

  1. Department of Pediatrics, Neonatal Unit, University Hospital, Rennes, France

    Patrick Pladys MD, PhD, Alain Beuchée MD & Pierre Bétrémieux MD

  2. INSERM, Laboratoire de Traitement du Signal et de l’Image, Rennes, France

    Lotfi Senhadji PhD

  3. Department of Cardiology and INSERM U 127, University Hospital, La Riboisière, Paris, France

    Pierre Maison Blanche MD

  4. Unité de Recherche Cardio-Vasculaire UPRES-EA3194, University Hospital, Rennes, France

    François Carré MD, PhD

Authors
  1. Patrick Pladys MD, PhD
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  5. Pierre Bétrémieux MD
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  6. François Carré MD, PhD
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Additional information

This study was supported by “Naître et vivre” and by COREC and presented in part at the meeting of the American Academy of Pediatrics, San Francisco, CA, October 2001 (Pediatric Cardiology 2001;22:450–451).

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Pladys, P., Senhadji, L., Blanche, P. et al. Beat-to-beat Analysis of the Relation between RT and RR Intervals in Newborns. J Perinatol 23, 212–217 (2003). https://doi.org/10.1038/sj.jp.7210890

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