Table 2

Summary of Doppler examinations performed

Infants with CLD Healthy preterm infants
Total Doppler examinations15098
 36 weeks' postmenstrual age2019
 Term1618
 1–13 weeks4518
 14–26 weeks3615
 27–39 weeks1815
 40–52 weeks1513
Median AT/RVET2-152 0.31 (0.21 to 0.43)2-150 0.37 (0.28 to 0.43)
AT/RVET velocity (units/week)2-152 0.18 (−2.7 to 1.2)2-151 0.16 (−3.0 to 3.0)

  • ↵2-150 p < 0.01;

  • ↵2-151 p = 0.42 compared with healthy preterm infants.

  • ↵2-152 Values expressed as median (range).

  • AT/RVET, ratio between acceleration time and the right ventricular ejection time; CLD, chronic lung disease.