Table 1. List of Potentially Useful Flow Parameters Derived from Flow Imaging in Cases of Congenital Heart Disease or Valvular Heart Disease.

Flow parameters	Formulae
Total systemic arterial flow (Qsa)	Qao
Total systemic venous return (Qsv)	Qsvc + Qdao
Total pulmonary arterial to total systemic arterial flow ratio	Qpa / Qsa
Total pulmonary venous to total systemic venous flow ratio	Qpv / Qsv
Total pulmonary arterial flow (Qpa)	Qrpa + Qlpa
Total pulmonary venous return (Qpv)	Qrpv + Qlpv
Systemic arterial flow to lungs (Qs - pa)	Qpv - Qpa
Systemic arterial flow to lungs* (Qs - pa*)	Qao - Qdao - Qsvc
Cardiac output (L/min)	(Net volume of Qsa or Qsv [m] x heart rate [beats/minute]) / 1000
Cardiac index (L/min/m2)	Cardiac output / body surface area (m2)

^*Alternative formulae for same flow measurements. Qao = total aortic flow, Qdao = descending aortic flow, Qlpa = left pulmonary arterial flow, Qlpv = left pulmonary venous return, Qpa = total pulmonary arterial flow, Qpv = total pulmonary venous return, Qrpa = right pulmonary arterial flow, Qrpv = right pulmonary venous return, Qsa = total systemic arterial flow, Qsv = total systemic venous return, Qsvc = superior venous cava flow