[Quantification of heart rate variability in newborn infants and during the first 6 months of age].
We have registered, on 36 normal newborns at term, ECG recordings of sixty seconds at a speed of 100 mm/second, from birth tooth sixth month of postnatal life. The heart rate variability was measured on its double slope, short and long term by the numerical method that Yeh proposed, consistent with the "differential index" (DI) and the "interval index" (II). For the short term variability, we have obtained minimum values at birth and maximum values at 72 hours of postnatal life, with a tendency to drop up to the end of the first month and later to become stable until the end of six months of age. The changes found among different ages, could be related to modifications in basal heart rate under autonomic nervous system control. The variability values of the long term, do not show a clear age relation.
Samper Villagrasa
M P
MP
Departamento de Pediatría, Facultad de Medicina, Universidad de Zaragoza.
Ventura Faci
M P
MP
Fabre González
E
E
Bescos Pisón
J L
JL
Pérez González
J
J
D000367:Age Factors; D004562:Electrocardiography; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn
Cuantificación de la variabilidad de la frecuencia cardiaca en el período de recién nacido y su evolución durante los seis primeros meses de edad.