INTRODUCTION
Dilatation of the right ventricular outflow tract (RVOT), in association
with regional right ventricular (RV) akinesia, dyskinesia, or aneurysm,
is one of the major criteria in the diagnosis of arrhythmogenic right
ventricular cardiomyopathy/dysplasia (ARVC/D) [1]. It is defined by
measuring the diameter of the RVOT by two-dimensional (2D) transthoracic
echocardiography (TTE) at end diastole in the parasternal short-axis
(PSAX) and the parasternal long-axis (PLAX) views.
Cardiovascular magnetic resonance imaging (CMR) could also be used to
measure the end-diastolic diameter of the RVOT, in views that are
similar to the 2D TTE views, which could be helpful in diagnosing RVOT
dilatation in patients with poor echocardiographic windows. However, the
reference ranges for the RVOT diameter by CMR have not been reported,
and the correlation and agreement between CMR and TTE measurements has
not been studied in children.
We therefore aimed to provide reference ranges for the RVOT diameter in
the strict transverse and sagittal views by CMR in children and
adolescents with normal RVOT anatomy, and to compare the measurements
with those obtained by 2D TTE according to the recommendations in the
2010 revised Task Force Criteria (TFC) of ARVC/D.[1]