Table 2: Methods of determination of RVO diameter, flow velocity, and reported mean (SD) values in mL/kg/min.

RVO diameterRVO flow velocityAngle correctionTime after birthRVO (mL/kg/min)
Preterm infantsTerm infants
MeanSD MeanSD

Takenaka et al., 1987 [27]not doneRVOT 2D guided PW doppler parasternal short axisno24 hours

Sholler et al., 1987 [28]Pulmonary annulus at end systole in 2D parasternal short axisRVOT 2D guided PW doppler parasternal short axisno14 days2531070

Shiraishi et al., 1988 [29]Pulmonary artery M mode leading edge parasternal long axisRVOT 2D guided PW doppler parasternal short axisno1-2 days10200

Walther et al., 1990 [18]mean systolic diameter of the Pulmonary arteryRVOT 2D guided PW doppler parasternal short axisnounknown26254481625448

Evans et al., 1996 [7]Pulmonary annulus at end systole in 2D sagittal viewRVOT 2D guided PW doppler sagittal viewno24 hours19202#71

Evans and Kluckow, 1996 [7]Pulmonary annulus at end systole in 2D sagittal viewRVOT 2D guided PW doppler sagittal viewno4 days20287#60

Yanowitz et al., 1999 [30]Pulmonary annulus at end systole in 2D parasternal short axisRVOT 2D guided PW doppler parasternal short axisno24 hours2035540

Yanowitz et al., 1999 [30]Pulmonary annulus at end systole in 2D parasternal short axisRVOT 2D guided PW doppler parasternal short axisno7 days2045050

Tsai-Goodman et al., 2001 [22]Pulmonary annulus at end systole in 2D parasternal short axisRVOT 2D guided PW doppler parasternal short axisno24 hours1025516255

Groves et al., 2008 [24]Pulmonary annulus at end systole in 2D parasternal short axisRVOT 2D guided PW doppler parasternal short axisno24 hours8040090

Sloot et al., 2010 [25]Pulmonary annulus at end systole in 2D sagittal viewRVOT 2D guided PW doppler sagittal viewno7 days57429116

#Preterm infants with mild respiratory distress.