Table 4: Range or mean (SD) of ductal diameters in preterm infants using a high left parasternal view with colour flow mapping at the site of maximum constriction.

Inclusion criteria Ductal diameter (mm)

Roberson and Silverman, 1994 [43]<34 week gestation482.6 (0.6)
Evans and Iyer, 1995 [41]<1500 gram and mechanical ventilation560–3.8
Kluckow and Evans, 1995 [42]<1500 gram and mechanical ventilation1160–3.8
Evans and Kluckow, 1996 [44]<1500 gram and mechanical ventilation1170–3.4
Kluckow and Evans, 2000 [45]<30 week gestation1260–3.5
Osborn et al., 2003 [46]<30 week gestation1280–4.3
El Hajjar et al., 2005 [47]<31 week gestation230–5.0/kg
El-Khuffash 2008 [48]<1500 gram330–4.1
Groves et al., 2008 [24]<31 week gestation800–3.9
Paradisis et al., 2009 [49]<30 week gestation902.0 (0.9)