4D cardiovascular magnetic resonance velocity mapping of alterations of right heart flow patterns and main pulmonary artery hemodynamics in tetralogy of Fallot

Table 3 Grading system for evaluating flow patterns in right heart chambers

RA	1	normal, single clockwise vortex^a
	2	increased number of vortices
RV diastole	1	normal right-handed helix through TV
	2	increased number of vortices
RV systole	1	uniform, laminar flow toward RVOT
	2	non-uniform, random, or disorganized

RA = right atrium; RV = right ventricle
^awhen viewed from the patients' right with the sinus venosus posterior and tricuspid valve anterior.

ISSN: 1532-429X