PEDIATRICS Vol. 65 No. 1 January 1980, pp. 50-56
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Factors Affecting Heart Rate Variability in Preterm Infants

Luis A. Cabal MD1, Bijan Siassi MD1, Bernardino Zanini MD1, Joan E. Hodgman MD1, and Edward E. Hon MD1

1 Department of Pediatrics, Division of Neonatology, University of Southern California School of Medicine, Women's Hospital, Los Angeles

Neonatal heart rate variability (NHRV) was studied in 92 preterm infants (birth weight, 750 to 2,500 gm; gestational age, 28 to 36 weeks). Each infant was monitored continuously during the first 6 hours and for one hour at 24, 48, and 168 hours of life. During each hour NHRV was quantified and related to the following parameters: sex, gestational age, postnatal age, heart rate, and the presence and severity of respiratory distress syndrome (RDS). NHRV in healthy preterm infants was inversely related to heart rate level and directly related to the infant's postnatal age. In healthy babies with gestations of 30 to 36 weeks there was no significant correlation between NHRV and gestation. Decrease in NHRV was significantly related to the severity of RDS, and the reappearance of NHRV in infants with RDS was associated with a good prognosis. Decreased NHRV significantly differentiated the infants with RDS who survived after the fifth hour of life. The data reveal that NHRV (1) should be corrected for heart rate level and postnatal age; (2) is decreased in RDS; and (3) can be used as an indicator of morbidity and mortality in preterm infants with RDS.

Submitted on August 31, 1978
Accepted on April 13, 1979




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