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. 1978 Sep;62(3):317-21.

Echographic ventricular systolic time intervals in normal term and preterm neonates

H Halliday, S Hirschfeld, T Riggs, J Liebman, A Fanaroff
  • PMID: 704203

Echographic ventricular systolic time intervals in normal term and preterm neonates

H Halliday et al. Pediatrics. 1978 Sep.

Abstract

Right ventricular and left ventricular systolic time intervals (RVSTIs and LVSTIs) were measured in normal term and preterm infants from 1 hour to 90 days of life. LVSTIs in both term and preterm infants were similar in the first five days of life. The ratio of left pre-ejection period (LPEP) to left ventricular ejection time (LVET) was lower in preterm infants older than age 5 days. Estimated gestational age had no influence on LVSTI. The ratio of right pre-ejection period (RPEP) to right ventricular ejection time (RVET) was lower in preterm infants (0.32) than in term newborns (0.37). The preterm RPEP/RVET ratio decreased with age, but at a slower rate than in term babies. This was consistent with the lower pulmonary vascular resistance present in preterm infants.

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