Table 2.

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

	RVO diameter	RVO flow velocity	Angle correction	Time after birth	RVO (mL/kg/min)
					Preterm infants			Term infants
					n	Mean	SD	n	Mean	SD
Takenaka et al., 1987 [27]	not done	RVOT 2D guided PW doppler parasternal short axis	no	24 hours
Sholler et al., 1987 [28]	Pulmonary annulus at end systole in 2D parasternal short axis	RVOT 2D guided PW doppler parasternal short axis	no	14 days				25	310	70
Shiraishi et al., 1988 [29]	Pulmonary artery M mode leading edge parasternal long axis	RVOT 2D guided PW doppler parasternal short axis	no	1-2 days				10	200
Walther et al., 1990 [18]	mean systolic diameter of the Pulmonary artery	RVOT 2D guided PW doppler parasternal short axis	no	unknown	26	254	48	16	254	48
Evans et al., 1996 [7]	Pulmonary annulus at end systole in 2D sagittal view	RVOT 2D guided PW doppler sagittal view	no	24 hours	19	202#	71
Evans and Kluckow, 1996 [7]	Pulmonary annulus at end systole in 2D sagittal view	RVOT 2D guided PW doppler sagittal view	no	4 days	20	287#	60
Yanowitz et al., 1999 [30]	Pulmonary annulus at end systole in 2D parasternal short axis	RVOT 2D guided PW doppler parasternal short axis	no	24 hours	20	355	40
Yanowitz et al., 1999 [30]	Pulmonary annulus at end systole in 2D parasternal short axis	RVOT 2D guided PW doppler parasternal short axis	no	7 days	20	450	50
Tsai-Goodman et al., 2001 [22]	Pulmonary annulus at end systole in 2D parasternal short axis	RVOT 2D guided PW doppler parasternal short axis	no	24 hours	10	255		16	255
Groves et al., 2008 [24]	Pulmonary annulus at end systole in 2D parasternal short axis	RVOT 2D guided PW doppler parasternal short axis	no	24 hours	80	400	90
Sloot et al., 2010 [25]	Pulmonary annulus at end systole in 2D sagittal view	RVOT 2D guided PW doppler sagittal view	no	7 days	57	429	116

^#Preterm infants with mild respiratory distress.