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Table 1 Grading system for evaluation of right heart flow patterns

From: Analysis of right heart flow patterns in repaired Tetralogy of Fallot with 4D flow-sensitive MRI

SVC/IVC 1 S wave > D wave
  2 D wave > S wave
RA 1 normal, single clockwise vortex
  2 increased vortices
RV diastole 1 normal right-handed helix through TV
  2 increased helicity and vorticity
RV systole 1 uniform, laminar flow toward RVOT
  2 non-uniform outflow
MPA/RPA/LPA 1 uniform, laminar flow
  2 helical or vortical flow