Table 1

Comparisons of mean (SD) transductal velocity ratios (TVR) between haemodynamically significant and non-significant ducts as assessed by various echocardiographic criteria

Echocardiography criteria Significant Non-significant p Value
LA/Ao > 1.48 and reverse/absent diastolic flow1.7 (0.8) (n = 18)3.4 (1.3) (n = 10) 0.0027
LA/Ao > 1.481.9 (0.9) (n = 26)2.8 (1.2) (n = 31) 0.0032
LVIDd/Ao > 1.922.2 (1.3) (n = 11)2.5 (1.2) (n = 35) 0.52
Reverse/absent diastolic flow1-150 2.1 (1.0) (n = 36)3.0 (1.3) (n = 16) 0.02
Open on 2D echo image1.5 (0.6) (n = 22)3.0 (1.1) (n = 27)< 0.0001
Pulsatile flow in PDA1.9 (0.9) (n = 36)3.4 (1.0) (n = 16) 0.0001
LVIDd > normal2.0 (1.0) (n = 18)2.6 (1.2) (n = 33) 0.058

  • Numbers in columns differ slightly due to unavailability of some variables in individual patients.

  • p Values assessed by Student's t test.

  • ↵1-150 Reverse or absent diastolic flow in the descending aorta.

  • LA/Ao, left atrial diameter/aortic diameter ratio; LVIDd/Ao, left ventricle internal diameter/aortic diameter ratio.